MetzNet
/
graphvent
4
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Switched from thread being the callback engine to node being the callback engine

gql_cataclysm
noah metz 2023-07-27 15:27:14 -06:00
parent 7a7a9c95a3
commit 3ad969a5ca
16 changed files with 316 additions and 1171 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
context.go
Unescape Escape View File

@ -135,18 +135,7 @@ func NewContext(db * badger.DB, log Logger) (*Context, error) {
return nil, err return nil, err
} }
thread_ctx := NewThreadExtContext() err = ctx.RegisterNodeType(GQLNodeType, []ExtType{ACLExtType, GroupExtType, GQLExtType})
err = ctx.RegisterExtension(ThreadExtType, LoadThreadExt, thread_ctx)
if err != nil {
return nil, err
}
err = thread_ctx.RegisterThreadType(GQLThreadType, gql_actions, gql_handlers)
if err != nil {
return nil, err
}
err = ctx.RegisterNodeType(GQLNodeType, []ExtType{ACLExtType, GroupExtType, GQLExtType, ThreadExtType})
if err != nil { if err != nil {
return nil, err return nil, err
} }

73
gql.go
Unescape Escape View File

@ -30,7 +30,6 @@ import (
"encoding/pem" "encoding/pem"
) )
const GQLThreadType = ThreadType("GQL")
const GQLNodeType = NodeType("GQL") const GQLNodeType = NodeType("GQL")
type AuthReqJSON struct { type AuthReqJSON struct {
@ -760,7 +759,7 @@ func NewGQLExtContext() *GQLExtContext {
Fields: graphql.Fields{}, Fields: graphql.Fields{},
}) })
mutation.AddFieldConfig("abort", GQLMutationAbort) mutation.AddFieldConfig("stop", GQLMutationStop)
mutation.AddFieldConfig("startChild", GQLMutationStartChild) mutation.AddFieldConfig("startChild", GQLMutationStartChild)
subscription := graphql.NewObject(graphql.ObjectConfig{ subscription := graphql.NewObject(graphql.ObjectConfig{
@ -790,10 +789,6 @@ func NewGQLExtContext() *GQLExtContext {
if err != nil { if err != nil {
panic(err) panic(err)
} }
err = context.AddInterface(GQLInterfaceThread)
if err != nil {
panic(err)
}
schema, err := BuildSchema(&context) schema, err := BuildSchema(&context)
if err != nil { if err != nil {
@ -829,7 +824,7 @@ func (ext *GQLExt) NewSubscriptionChannel(buffer int) chan Signal {
return new_listener return new_listener
} }
func (ext *GQLExt) Process(context *StateContext, node *Node, signal Signal) error { func (ext *GQLExt) Process(context *Context, princ_id NodeID, node *Node, signal Signal) {
ext.SubscribeLock.Lock() ext.SubscribeLock.Lock()
defer ext.SubscribeLock.Unlock() defer ext.SubscribeLock.Unlock()
@ -846,7 +841,7 @@ func (ext *GQLExt) Process(context *StateContext, node *Node, signal Signal) err
} }
} }
ext.SubscribeListeners = active_listeners ext.SubscribeListeners = active_listeners
return nil return
} }
const GQLExtType = ExtType("gql_thread") const GQLExtType = ExtType("gql_thread")
@ -963,28 +958,11 @@ func NewGQLExt(listen string, ecdh_curve ecdh.Curve, key *ecdsa.PrivateKey, tls_
} }
} }
var gql_actions ThreadActions = ThreadActions{ func StartGQLServer(ctx *Context, node *Node, gql_ext *GQLExt) error {
"wait": ThreadWait,
"restore": func(ctx *Context, thread *Node, thread_ext *ThreadExt) (string, error) {
return "start_server", ThreadRestore(ctx, thread, thread_ext, false)
},
"start": func(ctx * Context, thread *Node, thread_ext *ThreadExt) (string, error) {
_, err := ThreadStart(ctx, thread, thread_ext)
if err != nil {
return "", err
}
return "start_server", ThreadRestore(ctx, thread, thread_ext, true)
},
"start_server": func(ctx * Context, thread *Node, thread_ext *ThreadExt) (string, error) {
gql_ext, err := GetExt[*GQLExt](thread)
if err != nil {
return "", err
}
mux := http.NewServeMux() mux := http.NewServeMux()
mux.HandleFunc("/auth", AuthHandler(ctx, thread, gql_ext)) mux.HandleFunc("/auth", AuthHandler(ctx, node, gql_ext))
mux.HandleFunc("/gql", GQLHandler(ctx, thread, gql_ext)) mux.HandleFunc("/gql", GQLHandler(ctx, node, gql_ext))
mux.HandleFunc("/gqlws", GQLWSHandler(ctx, thread, gql_ext)) mux.HandleFunc("/gqlws", GQLWSHandler(ctx, node, gql_ext))
// Server a graphiql interface(TODO make configurable whether to start this) // Server a graphiql interface(TODO make configurable whether to start this)
mux.HandleFunc("/graphiql", GraphiQLHandler()) mux.HandleFunc("/graphiql", GraphiQLHandler())
@ -1000,12 +978,12 @@ var gql_actions ThreadActions = ThreadActions{
l, err := net.Listen("tcp", http_server.Addr) l, err := net.Listen("tcp", http_server.Addr)
if err != nil { if err != nil {
return "", fmt.Errorf("Failed to start listener for server on %s", http_server.Addr) return fmt.Errorf("Failed to start listener for server on %s", http_server.Addr)
} }
cert, err := tls.X509KeyPair(gql_ext.tls_cert, gql_ext.tls_key) cert, err := tls.X509KeyPair(gql_ext.tls_cert, gql_ext.tls_key)
if err != nil { if err != nil {
return "", err return err
} }
config := tls.Config{ config := tls.Config{
@ -1026,41 +1004,12 @@ var gql_actions ThreadActions = ThreadActions{
}(gql_ext) }(gql_ext)
context := NewWriteContext(ctx)
err = UpdateStates(context, thread, NewACLInfo(thread, []string{"http_server"}), func(context *StateContext) error {
gql_ext.tcp_listener = listener gql_ext.tcp_listener = listener
gql_ext.http_server = http_server gql_ext.http_server = http_server
return nil return nil
}) }
if err != nil {
return "", err
}
context = NewReadContext(ctx)
err = thread.Process(context, thread.ID, NewStatusSignal("server_started", thread.ID))
if err != nil {
return "", err
}
return "wait", nil
},
"finish": func(ctx *Context, thread *Node, thread_ext *ThreadExt) (string, error) {
gql_ext, err := GetExt[*GQLExt](thread)
if err != nil {
return "", err
}
func StopGQLServer(gql_ext *GQLExt) {
gql_ext.http_server.Shutdown(context.TODO()) gql_ext.http_server.Shutdown(context.TODO())
gql_ext.http_done.Wait() gql_ext.http_done.Wait()
return ThreadFinish(ctx, thread, thread_ext)
},
} }
var gql_handlers ThreadHandlers = ThreadHandlers{
"child_linked": ThreadChildLinked,
"start_child": ThreadStartChild,
"abort": ThreadAbort,
"stop": ThreadStop,
}

21
gql_interfaces.go
Unescape Escape View File

@ -55,22 +55,6 @@ func addLockableInterfaceFields(gql *GQLInterface, gql_lockable *GQLInterface) {
}) })
} }
func AddThreadInterfaceFields(gql *GQLInterface) {
addThreadInterfaceFields(gql, GQLInterfaceThread)
}
func addThreadInterfaceFields(gql *GQLInterface, gql_thread *GQLInterface) {
AddNodeInterfaceFields(gql)
gql.Interface.AddFieldConfig("Children", &graphql.Field{
Type: gql_thread.List,
})
gql.Interface.AddFieldConfig("Parent", &graphql.Field{
Type: gql_thread.Interface,
})
}
func NodeHasExtensions(node *Node, extensions []ExtType) bool { func NodeHasExtensions(node *Node, extensions []ExtType) bool {
if node == nil { if node == nil {
return false return false
@ -136,8 +120,3 @@ var GQLInterfaceLockable = NewGQLInterface("Lockable", "DefaultLockable", []*gra
addLockableFields(gql.Default, gql.Interface, gql.List) addLockableFields(gql.Default, gql.Interface, gql.List)
}) })
var GQLInterfaceThread = NewGQLInterface("Thread", "DefaultThread", []*graphql.Interface{GQLInterfaceNode.Interface, }, []ExtType{ThreadExtType, LockableExtType}, func(gql *GQLInterface){
addThreadInterfaceFields(gql, gql)
}, func(gql *GQLInterface) {
addThreadFields(gql.Default, gql.Interface, gql.List)
})

43
gql_mutation.go
Unescape Escape View File

@ -1,11 +1,10 @@
package graphvent package graphvent
import ( import (
"fmt"
"github.com/graphql-go/graphql" "github.com/graphql-go/graphql"
) )
var GQLMutationAbort = NewField(func()*graphql.Field { var GQLMutationStop = NewField(func()*graphql.Field {
gql_mutation_abort := &graphql.Field{ gql_mutation_stop := &graphql.Field{
Type: GQLTypeSignal.Type, Type: GQLTypeSignal.Type,
Args: graphql.FieldConfigArgument{ Args: graphql.FieldConfigArgument{
"id": &graphql.ArgumentConfig{ "id": &graphql.ArgumentConfig{
@ -13,39 +12,11 @@ var GQLMutationAbort = NewField(func()*graphql.Field {
}, },
}, },
Resolve: func(p graphql.ResolveParams) (interface{}, error) { Resolve: func(p graphql.ResolveParams) (interface{}, error) {
_, ctx, err := PrepResolve(p) return StopSignal, nil
if err != nil {
return nil, err
}
id, err := ExtractID(p, "id")
if err != nil {
return nil, err
}
var node *Node = nil
context := NewReadContext(ctx.Context)
err = UseStates(context, ctx.User, NewACLMap(
NewACLInfo(ctx.Server, []string{"children"}),
), func(context *StateContext) (error){
node, err = FindChild(context, ctx.User, ctx.Server, id)
if err != nil {
return err
}
if node == nil {
return fmt.Errorf("Failed to find ID: %s as child of server thread", id)
}
return node.Process(context, ctx.User.ID, AbortSignal)
})
if err != nil {
return nil, err
}
return AbortSignal, nil
}, },
} }
return gql_mutation_abort return gql_mutation_stop
}) })
var GQLMutationStartChild = NewField(func()*graphql.Field{ var GQLMutationStartChild = NewField(func()*graphql.Field{
@ -64,7 +35,7 @@ var GQLMutationStartChild = NewField(func()*graphql.Field{
}, },
}, },
Resolve: func(p graphql.ResolveParams) (interface{}, error) { Resolve: func(p graphql.ResolveParams) (interface{}, error) {
_, ctx, err := PrepResolve(p) /*_, ctx, err := PrepResolve(p)
if err != nil { if err != nil {
return nil, err return nil, err
} }
@ -102,10 +73,10 @@ var GQLMutationStartChild = NewField(func()*graphql.Field{
}) })
if err != nil { if err != nil {
return nil, err return nil, err
} }*/
// TODO: wait for the result of the signal to send back instead of just the signal // TODO: wait for the result of the signal to send back instead of just the signal
return signal, nil return nil, nil
}, },
} }

2
gql_query.go
Unescape Escape View File

@ -4,7 +4,7 @@ import (
) )
var GQLQuerySelf = &graphql.Field{ var GQLQuerySelf = &graphql.Field{
Type: GQLInterfaceThread.Default, Type: GQLInterfaceNode.Default,
Resolve: func(p graphql.ResolveParams) (interface{}, error) { Resolve: func(p graphql.ResolveParams) (interface{}, error) {
_, ctx, err := PrepResolve(p) _, ctx, err := PrepResolve(p)
if err != nil { if err != nil {

200
gql_resolvers.go
Unescape Escape View File

@ -89,218 +89,36 @@ func GQLNodeTypeHash(p graphql.ResolveParams) (interface{}, error) {
} }
func GQLNodeListen(p graphql.ResolveParams) (interface{}, error) { func GQLNodeListen(p graphql.ResolveParams) (interface{}, error) {
node, ctx, err := PrepResolve(p) // TODO figure out how nodes can read eachother
if err != nil { return "", nil
return nil, err
}
gql_ext, err := GetExt[*GQLExt](node)
if err != nil {
return nil, err
}
listen := ""
context := NewReadContext(ctx.Context)
err = UseStates(context, ctx.User, NewACLInfo(node, []string{"listen"}), func(context *StateContext) error {
listen = gql_ext.Listen
return nil
})
if err != nil {
return nil, err
}
return listen, nil
} }
func GQLThreadParent(p graphql.ResolveParams) (interface{}, error) { func GQLThreadParent(p graphql.ResolveParams) (interface{}, error) {
node, ctx, err := PrepResolve(p) return nil, nil
if err != nil {
return nil, err
}
thread_ext, err := GetExt[*ThreadExt](node)
if err != nil {
return nil, err
}
var parent *Node = nil
context := NewReadContext(ctx.Context)
err = UseStates(context, ctx.User, NewACLInfo(node, []string{"parent"}), func(context *StateContext) error {
parent = thread_ext.Parent
return nil
})
if err != nil {
return nil, err
}
return parent, nil
} }
func GQLThreadState(p graphql.ResolveParams) (interface{}, error) { func GQLThreadState(p graphql.ResolveParams) (interface{}, error) {
node, ctx, err := PrepResolve(p) return "", nil
if err != nil {
return nil, err
}
thread_ext, err := GetExt[*ThreadExt](node)
if err != nil {
return nil, err
}
var state string
context := NewReadContext(ctx.Context)
err = UseStates(context, ctx.User, NewACLInfo(node, []string{"state"}), func(context *StateContext) error {
state = thread_ext.State
return nil
})
if err != nil {
return nil, err
}
return state, nil
} }
func GQLThreadChildren(p graphql.ResolveParams) (interface{}, error) { func GQLThreadChildren(p graphql.ResolveParams) (interface{}, error) {
node, ctx, err := PrepResolve(p) return nil, nil
if err != nil {
return nil, err
}
thread_ext, err := GetExt[*ThreadExt](node)
if err != nil {
return nil, err
}
var children []*Node = nil
context := NewReadContext(ctx.Context)
err = UseStates(context, ctx.User, NewACLInfo(node, []string{"children"}), func(context *StateContext) error {
children = thread_ext.ChildList()
return nil
})
if err != nil {
return nil, err
}
return children, nil
} }
func GQLLockableRequirements(p graphql.ResolveParams) (interface{}, error) { func GQLLockableRequirements(p graphql.ResolveParams) (interface{}, error) {
node, ctx, err := PrepResolve(p) return nil, nil
if err != nil {
return nil, err
}
lockable_ext, err := GetExt[*LockableExt](node)
if err != nil {
return nil, err
}
var requirements []*Node = nil
context := NewReadContext(ctx.Context)
err = UseStates(context, ctx.User, NewACLInfo(node, []string{"requirements"}), func(context *StateContext) error {
requirements = make([]*Node, len(lockable_ext.Requirements))
i := 0
for _, req := range(lockable_ext.Requirements) {
requirements[i] = req
i += 1
}
return nil
})
if err != nil {
return nil, err
}
return requirements, nil
} }
func GQLLockableDependencies(p graphql.ResolveParams) (interface{}, error) { func GQLLockableDependencies(p graphql.ResolveParams) (interface{}, error) {
node, ctx, err := PrepResolve(p) return nil, nil
if err != nil {
return nil, err
}
lockable_ext, err := GetExt[*LockableExt](node)
if err != nil {
return nil, err
}
var dependencies []*Node = nil
context := NewReadContext(ctx.Context)
err = UseStates(context, ctx.User, NewACLInfo(node, []string{"dependencies"}), func(context *StateContext) error {
dependencies = make([]*Node, len(lockable_ext.Dependencies))
i := 0
for _, dep := range(lockable_ext.Dependencies) {
dependencies[i] = dep
i += 1
}
return nil
})
if err != nil {
return nil, err
}
return dependencies, nil
} }
func GQLLockableOwner(p graphql.ResolveParams) (interface{}, error) { func GQLLockableOwner(p graphql.ResolveParams) (interface{}, error) {
node, ctx, err := PrepResolve(p) return nil, nil
if err != nil {
return nil, err
}
lockable_ext, err := GetExt[*LockableExt](node)
if err != nil {
return nil, err
}
var owner *Node = nil
context := NewReadContext(ctx.Context)
err = UseStates(context, ctx.User, NewACLInfo(node, []string{"owner"}), func(context *StateContext) error {
owner = lockable_ext.Owner
return nil
})
if err != nil {
return nil, err
}
return owner, nil
} }
func GQLGroupMembers(p graphql.ResolveParams) (interface{}, error) { func GQLGroupMembers(p graphql.ResolveParams) (interface{}, error) {
node, ctx, err := PrepResolve(p) return nil, nil
if err != nil {
return nil, err
}
group_ext, err := GetExt[*GroupExt](node)
if err != nil {
return nil, err
}
var members []*Node
context := NewReadContext(ctx.Context)
err = UseStates(context, ctx.User, NewACLInfo(node, []string{"users"}), func(context *StateContext) error {
members = make([]*Node, len(group_ext.Members))
i := 0
for _, member := range(group_ext.Members) {
members[i] = member
i += 1
}
return nil
})
if err != nil {
return nil, err
}
return members, nil
} }
func GQLSignalFn(p graphql.ResolveParams, fn func(Signal, graphql.ResolveParams)(interface{}, error))(interface{}, error) { func GQLSignalFn(p graphql.ResolveParams, fn func(Signal, graphql.ResolveParams)(interface{}, error))(interface{}, error) {

2
gql_subscribe.go
Unescape Escape View File

@ -46,7 +46,7 @@ func GQLSubscribeFn(p graphql.ResolveParams, send_nil bool, fn func(*Context, *N
var GQLSubscriptionSelf = NewField(func()*graphql.Field{ var GQLSubscriptionSelf = NewField(func()*graphql.Field{
gql_subscription_self := &graphql.Field{ gql_subscription_self := &graphql.Field{
Type: GQLInterfaceThread.Default, Type: GQLInterfaceNode.Default,
Resolve: func(p graphql.ResolveParams) (interface{}, error) { Resolve: func(p graphql.ResolveParams) (interface{}, error) {
return p.Source, nil return p.Source, nil
}, },

77
gql_test.go
Unescape Escape View File

@ -3,114 +3,51 @@ package graphvent
import ( import (
"testing" "testing"
"time" "time"
"errors"
"crypto/rand" "crypto/rand"
"crypto/ecdh" "crypto/ecdh"
"crypto/ecdsa" "crypto/ecdsa"
"crypto/elliptic" "crypto/elliptic"
) )
func TestGQL(t *testing.T) {
}
func TestGQLDB(t * testing.T) { func TestGQLDB(t * testing.T) {
ctx := logTestContext(t, []string{"thread", "test", "signal", "policy", "db"}) ctx := logTestContext(t, []string{"loop", "node", "thread", "test", "signal", "policy", "db"})
TestUserNodeType := NodeType("TEST_USER") TestUserNodeType := NodeType("TEST_USER")
err := ctx.RegisterNodeType(TestUserNodeType, []ExtType{}) err := ctx.RegisterNodeType(TestUserNodeType, []ExtType{})
fatalErr(t, err) fatalErr(t, err)
u1 := NewNode(ctx, RandID(), TestUserNodeType) u1 := NewNode(ctx, RandID(), TestUserNodeType, nil)
ctx.Log.Logf("test", "U1_ID: %s", u1.ID) ctx.Log.Logf("test", "U1_ID: %s", u1.ID)
TestThreadNodeType := NodeType("TEST_THREAD")
err = ctx.RegisterNodeType(TestThreadNodeType, []ExtType{ACLExtType, ThreadExtType})
fatalErr(t, err)
t1_p1 := NewParentOfPolicy(Actions{"signal.abort", "signal.stop", "state.write"})
t1_p2 := NewPerNodePolicy(NodeActions{
u1.ID: Actions{"parent.write"},
})
t1_thread, err := NewThreadExt(ctx, BaseThreadType, nil,nil, "init", nil)
fatalErr(t, err)
t1 := NewNode(ctx,
RandID(),
TestThreadNodeType,
NewACLExt(&t1_p1, &t1_p2),
t1_thread)
ctx.Log.Logf("test", "T1_ID: %s", t1.ID)
key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader) key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
fatalErr(t, err) fatalErr(t, err)
gql_p1 := NewChildOfPolicy(Actions{"signal.status"})
gql_p2 := NewPerNodePolicy(NodeActions{
u1.ID: Actions{"children.write", "dependencies.write"},
})
gql_thread, err := NewThreadExt(ctx, GQLThreadType, nil, nil, "init", nil)
fatalErr(t, err)
gql_ext := NewGQLExt(":0", ecdh.P256(), key, nil, nil) gql_ext := NewGQLExt(":0", ecdh.P256(), key, nil, nil)
listener_ext := NewListenerExt(10) listener_ext := NewListenerExt(10)
gql := NewNode(ctx, RandID(), GQLNodeType, gql := NewNode(ctx, RandID(), GQLNodeType, nil,
gql_thread,
gql_ext, gql_ext,
listener_ext, listener_ext,
NewACLExt(&gql_p1, &gql_p2), NewACLExt(),
NewGroupExt(nil)) NewGroupExt(nil))
ctx.Log.Logf("test", "GQL_ID: %s", gql.ID) ctx.Log.Logf("test", "GQL_ID: %s", gql.ID)
info := ParentInfo{true, "start", "start"} err = gql.Signal(ctx, gql.ID, StopSignal)
context := NewWriteContext(ctx)
err = UpdateStates(context, u1, ACLMap{}, func(context *StateContext) error {
return LinkThreads(context, u1, gql, ChildInfo{t1, map[InfoType]Info{
ParentInfoType: &info,
}})
})
fatalErr(t, err)
context = NewReadContext(ctx)
err = gql.Process(context, gql.ID, NewStatusSignal("child_linked", t1.ID))
fatalErr(t, err) fatalErr(t, err)
context = NewReadContext(ctx)
err = gql.Process(context, gql.ID, AbortSignal)
fatalErr(t, err)
err = ThreadLoop(ctx, gql, "start")
if errors.Is(err, ThreadAbortedError) == false {
fatalErr(t, err)
}
(*GraphTester)(t).WaitForStatus(ctx, listener_ext.Chan, "aborted", 100*time.Millisecond, "Didn't receive aborted on listener") (*GraphTester)(t).WaitForStatus(ctx, listener_ext.Chan, "stopped", 100*time.Millisecond, "Didn't receive stopped on listener")
context = NewReadContext(ctx)
err = UseStates(context, gql, ACLList([]*Node{gql, u1}, nil), func(context *StateContext) error {
ser1, err := gql.Serialize() ser1, err := gql.Serialize()
ser2, err := u1.Serialize() ser2, err := u1.Serialize()
ctx.Log.Logf("test", "\n%s\n\n", ser1) ctx.Log.Logf("test", "\n%s\n\n", ser1)
ctx.Log.Logf("test", "\n%s\n\n", ser2) ctx.Log.Logf("test", "\n%s\n\n", ser2)
return err
})
// Clear all loaded nodes from the context so it loads them from the database // Clear all loaded nodes from the context so it loads them from the database
ctx.Nodes = NodeMap{} ctx.Nodes = NodeMap{}
gql_loaded, err := LoadNode(ctx, gql.ID) gql_loaded, err := LoadNode(ctx, gql.ID)
fatalErr(t, err) fatalErr(t, err)
context = NewReadContext(ctx)
err = UseStates(context, gql_loaded, NewACLInfo(gql_loaded, []string{"users", "children", "requirements"}), func(context *StateContext) error {
var err error
listener_ext, err = GetExt[*ListenerExt](gql_loaded) listener_ext, err = GetExt[*ListenerExt](gql_loaded)
if err != nil {
return err
}
return gql_loaded.Process(context, gql_loaded.ID, StopSignal)
})
fatalErr(t, err) fatalErr(t, err)
err = gql_loaded.Signal(ctx, gql_loaded.ID, StopSignal)
err = ThreadLoop(ctx, gql_loaded, "restore")
fatalErr(t, err) fatalErr(t, err)
(*GraphTester)(t).WaitForStatus(ctx, listener_ext.Chan, "stopped", 100*time.Millisecond, "Didn't receive stopped on update_channel_2") (*GraphTester)(t).WaitForStatus(ctx, listener_ext.Chan, "stopped", 100*time.Millisecond, "Didn't receive stopped on update_channel_2")

28
gql_types.go
Unescape Escape View File

@ -38,35 +38,11 @@ func addLockableFields(object *graphql.Object, lockable_interface *graphql.Inter
}) })
} }
func AddThreadFields(object *graphql.Object) {
addThreadFields(object, GQLInterfaceThread.Interface, GQLInterfaceThread.List)
}
func addThreadFields(object *graphql.Object, thread_interface *graphql.Interface, thread_list *graphql.List) {
AddNodeFields(object)
object.AddFieldConfig("State", &graphql.Field{
Type: graphql.String,
Resolve: GQLThreadState,
})
object.AddFieldConfig("Children", &graphql.Field{
Type: thread_list,
Resolve: GQLThreadChildren,
})
object.AddFieldConfig("Parent", &graphql.Field{
Type: thread_interface,
Resolve: GQLThreadParent,
})
}
var GQLNodeInterfaces = []*graphql.Interface{GQLInterfaceNode.Interface} var GQLNodeInterfaces = []*graphql.Interface{GQLInterfaceNode.Interface}
var GQLLockableInterfaces = append(GQLNodeInterfaces, GQLInterfaceLockable.Interface) var GQLLockableInterfaces = append(GQLNodeInterfaces, GQLInterfaceLockable.Interface)
var GQLThreadInterfaces = append(GQLNodeInterfaces, GQLInterfaceThread.Interface)
var GQLTypeGQLNode = NewGQLNodeType(GQLNodeType, GQLThreadInterfaces, func(gql *GQLType) { var GQLTypeGQLNode = NewGQLNodeType(GQLNodeType, GQLNodeInterfaces, func(gql *GQLType) {
AddThreadFields(gql.Type) AddNodeFields(gql.Type)
gql.Type.AddFieldConfig("Listen", &graphql.Field{ gql.Type.AddFieldConfig("Listen", &graphql.Field{
Type: graphql.String, Type: graphql.String,

1
graph_test.go
Unescape Escape View File

@ -60,6 +60,7 @@ func NewSimpleListener(ctx *Context, buffer int) (*Node, *ListenerExt) {
listener := NewNode(ctx, listener := NewNode(ctx,
RandID(), RandID(),
SimpleListenerNodeType, SimpleListenerNodeType,
nil,
listener_extension, listener_extension,
NewACLExt(&policy), NewACLExt(&policy),
NewLockableExt(nil, nil, nil, nil)) NewLockableExt(nil, nil, nil, nil))

428
lockable.go
Unescape Escape View File

@ -1,7 +1,6 @@
package graphvent package graphvent
import ( import (
"fmt"
"encoding/json" "encoding/json"
) )
@ -32,14 +31,14 @@ func (listener *ListenerExt) Type() ExtType {
return ListenerExtType return ListenerExtType
} }
func (ext *ListenerExt) Process(context *StateContext, node *Node, signal Signal) error { func (ext *ListenerExt) Process(ctx *Context, princ_id NodeID, node *Node, signal Signal) {
context.Graph.Log.Logf("signal", "LISTENER_PROCESS: %s - %+v", node.ID, signal) ctx.Log.Logf("signal", "LISTENER_PROCESS: %s - %+v", node.ID, signal)
select { select {
case ext.Chan <- signal: case ext.Chan <- signal:
default: default:
return fmt.Errorf("LISTENER_OVERFLOW - %+v", signal) ctx.Log.Logf("listener", "LISTENER_OVERFLOW: %s", node.ID)
} }
return nil return
} }
func (ext *ListenerExt) Serialize() ([]byte, error) { func (ext *ListenerExt) Serialize() ([]byte, error) {
@ -47,10 +46,10 @@ func (ext *ListenerExt) Serialize() ([]byte, error) {
} }
type LockableExt struct { type LockableExt struct {
Owner *Node Owner *NodeID `json:"owner"`
Requirements map[NodeID]*Node Requirements []NodeID `json:"requirements"`
Dependencies map[NodeID]*Node Dependencies []NodeID `json:"dependencies"`
LocksHeld map[NodeID]*Node LocksHeld map[NodeID]*NodeID `json:"locks_held"`
} }
const LockableExtType = ExtType("LOCKABLE") const LockableExtType = ExtType("LOCKABLE")
@ -58,33 +57,13 @@ func (ext *LockableExt) Type() ExtType {
return LockableExtType return LockableExtType
} }
type LockableExtJSON struct {
Owner string `json:"owner"`
Requirements []string `json:"requirements"`
Dependencies []string `json:"dependencies"`
LocksHeld map[string]string `json:"locks_held"`
}
func (ext *LockableExt) Serialize() ([]byte, error) { func (ext *LockableExt) Serialize() ([]byte, error) {
return json.MarshalIndent(&LockableExtJSON{ return json.MarshalIndent(ext, "", " ")
Owner: SaveNode(ext.Owner),
Requirements: SaveNodeList(ext.Requirements),
Dependencies: SaveNodeList(ext.Dependencies),
LocksHeld: SaveNodeMap(ext.LocksHeld),
}, "", " ")
} }
func NewLockableExt(owner *Node, requirements NodeMap, dependencies NodeMap, locks_held NodeMap) *LockableExt { func NewLockableExt(owner *NodeID, requirements []NodeID, dependencies []NodeID, locks_held map[NodeID]*NodeID) *LockableExt {
if requirements == nil {
requirements = NodeMap{}
}
if dependencies == nil {
dependencies = NodeMap{}
}
if locks_held == nil { if locks_held == nil {
locks_held = NodeMap{} locks_held = map[NodeID]*NodeID{}
} }
return &LockableExt{ return &LockableExt{
@ -96,412 +75,71 @@ func NewLockableExt(owner *Node, requirements NodeMap, dependencies NodeMap, loc
} }
func LoadLockableExt(ctx *Context, data []byte) (Extension, error) { func LoadLockableExt(ctx *Context, data []byte) (Extension, error) {
var j LockableExtJSON var ext LockableExt
err := json.Unmarshal(data, &j) err := json.Unmarshal(data, &ext)
if err != nil {
return nil, err
}
ctx.Log.Logf("db", "DB_LOADING_LOCKABLE_EXT_JSON: %+v", j)
owner, err := RestoreNode(ctx, j.Owner)
if err != nil {
return nil, err
}
requirements, err := RestoreNodeList(ctx, j.Requirements)
if err != nil {
return nil, err
}
dependencies, err := RestoreNodeList(ctx, j.Dependencies)
if err != nil { if err != nil {
return nil, err return nil, err
} }
locks_held, err := RestoreNodeMap(ctx, j.LocksHeld) ctx.Log.Logf("db", "DB_LOADING_LOCKABLE_EXT_JSON: %+v", ext)
if err != nil {
return nil, err
}
return &ext, nil
return NewLockableExt(owner, requirements, dependencies, locks_held), nil
} }
func (ext *LockableExt) Process(context *StateContext, node *Node, signal Signal) error { func (ext *LockableExt) Process(ctx *Context, source NodeID, node *Node, signal Signal) {
context.Graph.Log.Logf("signal", "LOCKABLE_PROCESS: %s", node.ID) ctx.Log.Logf("signal", "LOCKABLE_PROCESS: %s", node.ID)
switch signal.Direction() { switch signal.Direction() {
case Up: case Up:
owner_sent := false owner_sent := false
for _, dependency := range(ext.Dependencies) { for _, dependency := range(ext.Dependencies) {
context.Graph.Log.Logf("signal", "SENDING_TO_DEPENDENCY: %s -> %s", node.ID, dependency.ID) err := node.Signal(ctx, dependency, signal)
err := dependency.Process(context, node.ID, signal)
if err != nil { if err != nil {
return err ctx.Log.Logf("signal", "LOCKABLE_SIGNAL_ERR: %s->%s - %e", node.ID, dependency, err)
} }
if ext.Owner != nil { if ext.Owner != nil {
if dependency.ID == ext.Owner.ID { if dependency == *ext.Owner {
owner_sent = true owner_sent = true
} }
} }
} }
if ext.Owner != nil && owner_sent == false { if ext.Owner != nil && owner_sent == false {
if ext.Owner.ID != node.ID { if *ext.Owner != node.ID {
context.Graph.Log.Logf("signal", "SENDING_TO_OWNER: %s -> %s", node.ID, ext.Owner.ID) err := node.Signal(ctx, *ext.Owner, signal)
err := ext.Owner.Process(context, node.ID, signal)
if err != nil { if err != nil {
return err ctx.Log.Logf("signal", "LOCKABLE_SIGNAL_ERR: %s->%s - %e", node.ID, *ext.Owner, err)
} }
} }
} }
case Down: case Down:
for _, requirement := range(ext.Requirements) { for _, requirement := range(ext.Requirements) {
err := requirement.Process(context, node.ID, signal) err := node.Signal(ctx, requirement, signal)
if err != nil { if err != nil {
return err ctx.Log.Logf("signal", "LOCKABLE_SIGNAL_ERR: %s->%s - %e", node.ID, requirement, err)
} }
} }
case Direct: case Direct:
default: default:
return fmt.Errorf("invalid signal direction %d", signal.Direction())
} }
return nil
} }
func (ext *LockableExt) RecordUnlock(node *Node) *Node { func (ext *LockableExt) RecordUnlock(node NodeID) *NodeID {
last_owner, exists := ext.LocksHeld[node.ID] last_owner, exists := ext.LocksHeld[node]
if exists == false { if exists == false {
panic("Attempted to take a get the original lock holder of a lockable we don't own") panic("Attempted to take a get the original lock holder of a lockable we don't own")
} }
delete(ext.LocksHeld, node.ID) delete(ext.LocksHeld, node)
return last_owner return last_owner
} }
func (ext *LockableExt) RecordLock(node *Node, last_owner *Node) { func (ext *LockableExt) RecordLock(node NodeID, last_owner *NodeID) {
_, exists := ext.LocksHeld[node.ID] _, exists := ext.LocksHeld[node]
if exists == true { if exists == true {
panic("Attempted to lock a lockable we're already holding(lock cycle)") panic("Attempted to lock a lockable we're already holding(lock cycle)")
} }
ext.LocksHeld[node.ID] = last_owner ext.LocksHeld[node] = last_owner
}
// Removes requirement as a requirement from lockable
func UnlinkLockables(context *StateContext, princ *Node, lockable *Node, requirement *Node) error {
lockable_ext, err := GetExt[*LockableExt](lockable)
if err != nil {
return err
}
requirement_ext, err := GetExt[*LockableExt](requirement)
if err != nil {
return err
}
return UpdateStates(context, princ, ACLMap{
lockable.ID: ACLInfo{Node: lockable, Resources: []string{"requirements"}},
requirement.ID: ACLInfo{Node: requirement, Resources: []string{"dependencies"}},
}, func(context *StateContext) error {
var found *Node = nil
for _, req := range(lockable_ext.Requirements) {
if requirement.ID == req.ID {
found = req
break
}
}
if found == nil {
return fmt.Errorf("UNLINK_LOCKABLES_ERR: %s is not a requirement of %s", requirement.ID, lockable.ID)
}
delete(requirement_ext.Dependencies, lockable.ID)
delete(lockable_ext.Requirements, requirement.ID)
return nil
})
}
// Link requirements as requirements to lockable
func LinkLockables(context *StateContext, princ *Node, lockable *Node, requirements []*Node) error {
if lockable == nil {
return fmt.Errorf("LOCKABLE_LINK_ERR: Will not link Lockables to nil as requirements")
}
if len(requirements) == 0 {
return fmt.Errorf("LOCKABLE_LINK_ERR: Will not link no lockables in call")
}
lockable_ext, err := GetExt[*LockableExt](lockable)
if err != nil {
return err
}
req_exts := map[NodeID]*LockableExt{}
for _, requirement := range(requirements) {
if requirement == nil {
return fmt.Errorf("LOCKABLE_LINK_ERR: Will not link nil to a Lockable as a requirement")
}
if lockable.ID == requirement.ID {
return fmt.Errorf("LOCKABLE_LINK_ERR: cannot link %s to itself", lockable.ID)
}
_, exists := req_exts[requirement.ID]
if exists == true {
return fmt.Errorf("LOCKABLE_LINK_ERR: cannot link %s twice", requirement.ID)
}
ext, err := GetExt[*LockableExt](requirement)
if err != nil {
return err
}
req_exts[requirement.ID] = ext
}
return UpdateStates(context, princ, NewACLMap(
NewACLInfo(lockable, []string{"requirements"}),
ACLList(requirements, []string{"dependencies"}),
), func(context *StateContext) error {
// Check that all the requirements can be added
// If the lockable is already locked, need to lock this resource as well before we can add it
for _, requirement := range(requirements) {
requirement_ext := req_exts[requirement.ID]
for _, req := range(requirements) {
if req.ID == requirement.ID {
continue
}
is_req, err := checkIfRequirement(context, req.ID, requirement_ext)
if err != nil {
return err
} else if is_req {
return fmt.Errorf("LOCKABLE_LINK_ERR: %s is a dependency of %s so cannot add the same dependency", req.ID, requirement.ID)
}
}
is_req, err := checkIfRequirement(context, lockable.ID, requirement_ext)
if err != nil {
return err
} else if is_req {
return fmt.Errorf("LOCKABLE_LINK_ERR: %s is a dependency of %s so cannot link as requirement", requirement.ID, lockable.ID)
}
is_req, err = checkIfRequirement(context, requirement.ID, lockable_ext)
if err != nil {
return err
} else if is_req {
return fmt.Errorf("LOCKABLE_LINK_ERR: %s is a dependency of %s so cannot link as dependency again", lockable.ID, requirement.ID)
}
if lockable_ext.Owner == nil {
// If the new owner isn't locked, we can add the requirement
} else if requirement_ext.Owner == nil {
// if the new requirement isn't already locked but the owner is, the requirement needs to be locked first
return fmt.Errorf("LOCKABLE_LINK_ERR: %s is locked, %s must be locked to add", lockable.ID, requirement.ID)
} else {
// If the new requirement is already locked and the owner is already locked, their owners need to match
if requirement_ext.Owner.ID != lockable_ext.Owner.ID {
return fmt.Errorf("LOCKABLE_LINK_ERR: %s is not locked by the same owner as %s, can't link as requirement", requirement.ID, lockable.ID)
}
}
}
// Update the states of the requirements
for _, requirement := range(requirements) {
requirement_ext := req_exts[requirement.ID]
requirement_ext.Dependencies[lockable.ID] = lockable
lockable_ext.Requirements[lockable.ID] = requirement
context.Graph.Log.Logf("lockable", "LOCKABLE_LINK: linked %s to %s as a requirement", requirement.ID, lockable.ID)
}
// Return no error
return nil
})
}
func checkIfRequirement(context *StateContext, id NodeID, cur *LockableExt) (bool, error) {
for _, req := range(cur.Requirements) {
if req.ID == id {
return true, nil
}
req_ext, err := GetExt[*LockableExt](req)
if err != nil {
return false, err
}
var is_req bool
err = UpdateStates(context, req, NewACLInfo(req, []string{"requirements"}), func(context *StateContext) error {
is_req, err = checkIfRequirement(context, id, req_ext)
return err
})
if err != nil {
return false, err
}
if is_req == true {
return true, nil
}
}
return false, nil
}
// Lock nodes in the to_lock slice with new_owner, does not modify any states if returning an error
// Assumes that new_owner will be written to after returning, even though it doesn't get locked during the call
func LockLockables(context *StateContext, to_lock NodeMap, new_owner *Node) error {
if to_lock == nil {
return fmt.Errorf("LOCKABLE_LOCK_ERR: no map provided")
}
req_exts := map[NodeID]*LockableExt{}
for _, l := range(to_lock) {
var err error
if l == nil {
return fmt.Errorf("LOCKABLE_LOCK_ERR: Can not lock nil")
}
req_exts[l.ID], err = GetExt[*LockableExt](l)
if err != nil {
return err
}
}
if new_owner == nil {
return fmt.Errorf("LOCKABLE_LOCK_ERR: nil cannot hold locks")
}
new_owner_ext, err := GetExt[*LockableExt](new_owner)
if err != nil {
return err
}
// Called with no requirements to lock, success
if len(to_lock) == 0 {
return nil
}
return UpdateStates(context, new_owner, NewACLMap(
ACLListM(to_lock, []string{"lock"}),
NewACLInfo(new_owner, nil),
), func(context *StateContext) error {
// First loop is to check that the states can be locked, and locks all requirements
for _, req := range(to_lock) {
req_ext := req_exts[req.ID]
context.Graph.Log.Logf("lockable", "LOCKABLE_LOCKING: %s from %s", req.ID, new_owner.ID)
// If req is alreay locked, check that we can pass the lock
if req_ext.Owner != nil {
owner := req_ext.Owner
if owner.ID == new_owner.ID {
continue
} else {
err := UpdateStates(context, new_owner, NewACLInfo(owner, []string{"take_lock"}), func(context *StateContext)(error){
return LockLockables(context, req_ext.Requirements, req)
})
if err != nil {
return err
}
}
} else {
err := LockLockables(context, req_ext.Requirements, req)
if err != nil {
return err
}
}
}
// At this point state modification will be started, so no errors can be returned
for _, req := range(to_lock) {
req_ext := req_exts[req.ID]
old_owner := req_ext.Owner
// If the lockable was previously unowned, update the state
if old_owner == nil {
context.Graph.Log.Logf("lockable", "LOCKABLE_LOCK: %s locked %s", new_owner.ID, req.ID)
req_ext.Owner = new_owner
new_owner_ext.RecordLock(req, old_owner)
// Otherwise if the new owner already owns it, no need to update state
} else if old_owner.ID == new_owner.ID {
context.Graph.Log.Logf("lockable", "LOCKABLE_LOCK: %s already owns %s", new_owner.ID, req.ID)
// Otherwise update the state
} else {
req_ext.Owner = new_owner
new_owner_ext.RecordLock(req, old_owner)
context.Graph.Log.Logf("lockable", "LOCKABLE_LOCK: %s took lock of %s from %s", new_owner.ID, req.ID, old_owner.ID)
}
}
return nil
})
}
func UnlockLockables(context *StateContext, to_unlock NodeMap, old_owner *Node) error {
if to_unlock == nil {
return fmt.Errorf("LOCKABLE_UNLOCK_ERR: no list provided")
}
req_exts := map[NodeID]*LockableExt{}
for _, l := range(to_unlock) {
if l == nil {
return fmt.Errorf("LOCKABLE_UNLOCK_ERR: Can not unlock nil")
}
var err error
req_exts[l.ID], err = GetExt[*LockableExt](l)
if err != nil {
return err
}
}
if old_owner == nil {
return fmt.Errorf("LOCKABLE_UNLOCK_ERR: nil cannot hold locks")
}
old_owner_ext, err := GetExt[*LockableExt](old_owner)
if err != nil {
return err
}
// Called with no requirements to unlock, success
if len(to_unlock) == 0 {
return nil
}
return UpdateStates(context, old_owner, NewACLMap(
ACLListM(to_unlock, []string{"lock"}),
NewACLInfo(old_owner, nil),
), func(context *StateContext) error {
// First loop is to check that the states can be locked, and locks all requirements
for _, req := range(to_unlock) {
req_ext := req_exts[req.ID]
context.Graph.Log.Logf("lockable", "LOCKABLE_UNLOCKING: %s from %s", req.ID, old_owner.ID)
// Check if the owner is correct
if req_ext.Owner != nil {
if req_ext.Owner.ID != old_owner.ID {
return fmt.Errorf("LOCKABLE_UNLOCK_ERR: %s is not locked by %s", req.ID, old_owner.ID)
}
} else {
return fmt.Errorf("LOCKABLE_UNLOCK_ERR: %s is not locked", req.ID)
}
err := UnlockLockables(context, req_ext.Requirements, req)
if err != nil {
return err
}
}
// At this point state modification will be started, so no errors can be returned
for _, req := range(to_unlock) {
req_ext := req_exts[req.ID]
new_owner := old_owner_ext.RecordUnlock(req)
req_ext.Owner = new_owner
if new_owner == nil {
context.Graph.Log.Logf("lockable", "LOCKABLE_UNLOCK: %s unlocked %s", old_owner.ID, req.ID)
} else {
context.Graph.Log.Logf("lockable", "LOCKABLE_UNLOCK: %s passed lock of %s back to %s", old_owner.ID, req.ID, new_owner.ID)
}
}
return nil
})
} }
func SaveNode(node *Node) string { func SaveNode(node *Node) string {

414
node.go
Unescape Escape View File

@ -2,9 +2,11 @@ package graphvent
import ( import (
"sync" "sync"
"time"
"reflect" "reflect"
"github.com/google/uuid" "github.com/google/uuid"
badger "github.com/dgraph-io/badger/v3" badger "github.com/dgraph-io/badger/v3"
"runtime"
"fmt" "fmt"
"encoding/binary" "encoding/binary"
"encoding/json" "encoding/json"
@ -20,6 +22,17 @@ func (id NodeID) MarshalJSON() ([]byte, error) {
return json.Marshal(&str) return json.Marshal(&str)
} }
func (id *NodeID) UnmarshalJSON(bytes []byte) error {
var id_str string
err := json.Unmarshal(bytes, &id_str)
if err != nil {
return err
}
*id, err = ParseID(id_str)
return err
}
var ZeroUUID = uuid.UUID{} var ZeroUUID = uuid.UUID{}
var ZeroID = NodeID(ZeroUUID) var ZeroID = NodeID(ZeroUUID)
@ -62,20 +75,132 @@ type Serializable[I comparable] interface {
Serialize() ([]byte, error) Serialize() ([]byte, error)
} }
// NodeExtensions are additional data that can be attached to nodes, and used in node functions
type Extension interface { type Extension interface {
Serializable[ExtType] Serializable[ExtType]
// Send a signal to this extension to process, Process(context *Context, source NodeID, node *Node, signal Signal)
// this typically triggers signals to be sent to nodes linked in the extension }
Process(context *StateContext, node *Node, signal Signal) error
type QueuedSignal struct {
Signal Signal
Time time.Time
} }
const NODE_MSG_CHAN_DEFAULT = 1024
// Nodes represent an addressible group of extensions // Nodes represent an addressible group of extensions
type Node struct { type Node struct {
ID NodeID ID NodeID
Type NodeType Type NodeType
Lock sync.RWMutex Lock sync.RWMutex
Extensions map[ExtType]Extension Extensions map[ExtType]Extension
MsgChan chan Msg
TimeoutChan <-chan time.Time
LoopLock sync.Mutex
Active bool
SignalQueue []QueuedSignal
NextSignal *QueuedSignal
}
func (node *Node) QueueSignal(time time.Time, signal Signal) {
node.SignalQueue = append(node.SignalQueue, QueuedSignal{signal, time})
node.NextSignal, node.TimeoutChan = SoonestSignal(node.SignalQueue)
}
func (node *Node) ClearSignalQueue() {
node.SignalQueue = []QueuedSignal{}
node.NextSignal = nil
node.TimeoutChan = nil
}
func SoonestSignal(signals []QueuedSignal) (*QueuedSignal, <-chan time.Time) {
var soonest_signal *QueuedSignal
var soonest_time time.Time
for _, signal := range(signals) {
if signal.Time.Compare(soonest_time) == -1 || soonest_signal == nil {
soonest_signal = &signal
soonest_time = signal.Time
}
}
if soonest_signal != nil {
return soonest_signal, time.After(time.Until(soonest_time))
} else {
return nil, nil
}
}
func RunNode(ctx *Context, node *Node) {
ctx.Log.Logf("node", "RUN_START: %s", node.ID)
err := NodeLoop(ctx, node)
if err != nil {
panic(err)
}
ctx.Log.Logf("node", "RUN_STOP: %s", node.ID)
}
type Msg struct {
Source NodeID
Signal Signal
}
// Main Loop for Threads, starts a write context, so cannot be called from a write or read context
func NodeLoop(ctx *Context, node *Node) error {
node.LoopLock.Lock()
defer node.LoopLock.Unlock()
node.Active = true
for true {
var signal Signal
var source NodeID
select {
case msg := <- node.MsgChan:
signal = msg.Signal
source = msg.Source
err := Allowed(ctx, msg.Source, string(signal.Type()), node)
if err != nil {
ctx.Log.Logf("signal", "SIGNAL_POLICY_ERR: %s", err)
continue
}
case <-node.TimeoutChan:
signal = node.NextSignal.Signal
source = node.ID
node.NextSignal, node.TimeoutChan = SoonestSignal(node.SignalQueue)
ctx.Log.Logf("node", "NODE_TIMEOUT %s - NEXT_SIGNAL: %s", node.ID, signal)
}
// Handle special signal types
if signal.Type() == StopSignalType {
node.Process(ctx, node.ID, NewStatusSignal("stopped", node.ID))
break
}
node.Process(ctx, source, signal)
}
return nil
}
func (node *Node) Process(ctx *Context, source NodeID, signal Signal) {
for ext_type, ext := range(node.Extensions) {
ctx.Log.Logf("signal", "PROCESSING_EXTENSION: %s/%s", node.ID, ext_type)
ext.Process(ctx, source, node, signal)
}
}
func (node *Node) Signal(ctx *Context, dest NodeID, signal Signal) error {
target, exists := ctx.Nodes[dest]
if exists == false {
return fmt.Errorf("%s does not exist, cannot signal it", dest)
}
select {
case target.MsgChan <- Msg{node.ID, signal}:
default:
buf := make([]byte, 4096)
n := runtime.Stack(buf, false)
stack_str := string(buf[:n])
return fmt.Errorf("SIGNAL_OVERFLOW: %s - %s", dest, stack_str)
}
return nil
} }
func GetCtx[T Extension, C any](ctx *Context) (C, error) { func GetCtx[T Extension, C any](ctx *Context) (C, error) {
@ -118,8 +243,10 @@ func (node *Node) Serialize() ([]byte, error) {
Magic: NODE_DB_MAGIC, Magic: NODE_DB_MAGIC,
TypeHash: node.Type.Hash(), TypeHash: node.Type.Hash(),
NumExtensions: uint32(len(extensions)), NumExtensions: uint32(len(extensions)),
NumQueuedSignals: uint32(len(node.SignalQueue)),
}, },
Extensions: extensions, Extensions: extensions,
QueuedSignals: node.SignalQueue,
} }
i := 0 i := 0
@ -141,7 +268,8 @@ func (node *Node) Serialize() ([]byte, error) {
return node_db.Serialize(), nil return node_db.Serialize(), nil
} }
func NewNode(ctx *Context, id NodeID, node_type NodeType, extensions ...Extension) *Node { // Create a new node in memory and start it's event loop
func NewNode(ctx *Context, id NodeID, node_type NodeType, queued_signals []QueuedSignal, extensions ...Extension) *Node {
_, exists := ctx.Nodes[id] _, exists := ctx.Nodes[id]
if exists == true { if exists == true {
panic("Attempted to create an existing node") panic("Attempted to create an existing node")
@ -168,18 +296,31 @@ func NewNode(ctx *Context, id NodeID, node_type NodeType, extensions ...Extensio
} }
} }
if queued_signals == nil {
queued_signals = []QueuedSignal{}
}
next_signal, timeout_chan := SoonestSignal(queued_signals)
node := &Node{ node := &Node{
ID: id, ID: id,
Type: node_type, Type: node_type,
Extensions: ext_map, Extensions: ext_map,
MsgChan: make(chan Msg, NODE_MSG_CHAN_DEFAULT),
TimeoutChan: timeout_chan,
SignalQueue: queued_signals,
NextSignal: next_signal,
} }
ctx.Nodes[id] = node ctx.Nodes[id] = node
WriteNode(ctx, node)
go RunNode(ctx, node)
return node return node
} }
func Allowed(context *StateContext, principal_id NodeID, action string, node *Node) error { func Allowed(ctx *Context, principal_id NodeID, action string, node *Node) error {
context.Graph.Log.Logf("policy", "POLICY_CHECK: %s %s.%s", principal_id, node.ID, action) ctx.Log.Logf("policy", "POLICY_CHECK: %s %s.%s", principal_id, node.ID, action)
// Nodes are allowed to perform all actions on themselves regardless of whether or not they have an ACL extension // Nodes are allowed to perform all actions on themselves regardless of whether or not they have an ACL extension
if principal_id == node.ID { if principal_id == node.ID {
return nil return nil
@ -191,43 +332,24 @@ func Allowed(context *StateContext, principal_id NodeID, action string, node *No
return err return err
} }
return policy_ext.Allows(context, principal_id, action, node) return policy_ext.Allows(ctx, principal_id, action, node)
}
// Check that princ is allowed to signal this action,
// then send the signal to all the extensions of the node
func (node *Node) Process(context *StateContext, princ_id NodeID, signal Signal) error {
ser, _ := signal.Serialize()
context.Graph.Log.Logf("signal", "SIGNAL: %s - %s", node.ID, string(ser))
err := Allowed(context, princ_id, fmt.Sprintf("signal.%s", signal.Type()), node)
if err != nil {
return err
}
for ext_type, ext := range(node.Extensions) {
err = ext.Process(context, node, signal)
if err != nil {
context.Graph.Log.Logf("signal", "EXTENSION_SIGNAL_ERR: %s/%s - %s", node.ID, ext_type, err)
}
}
return nil
} }
// Magic first four bytes of serialized DB content, stored big endian // Magic first four bytes of serialized DB content, stored big endian
const NODE_DB_MAGIC = 0x2491df14 const NODE_DB_MAGIC = 0x2491df14
// Total length of the node database header, has magic to verify and type_hash to map to load function // Total length of the node database header, has magic to verify and type_hash to map to load function
const NODE_DB_HEADER_LEN = 16 const NODE_DB_HEADER_LEN = 20
// A DBHeader is parsed from the first NODE_DB_HEADER_LEN bytes of a serialized DB node // A DBHeader is parsed from the first NODE_DB_HEADER_LEN bytes of a serialized DB node
type NodeDBHeader struct { type NodeDBHeader struct {
Magic uint32 Magic uint32
NumExtensions uint32 NumExtensions uint32
NumQueuedSignals uint32
TypeHash uint64 TypeHash uint64
} }
type NodeDB struct { type NodeDB struct {
Header NodeDBHeader Header NodeDBHeader
QueuedSignals []QueuedSignal
Extensions []ExtensionDB Extensions []ExtensionDB
} }
@ -239,7 +361,8 @@ func NewNodeDB(data []byte) (NodeDB, error) {
magic := binary.BigEndian.Uint32(data[0:4]) magic := binary.BigEndian.Uint32(data[0:4])
num_extensions := binary.BigEndian.Uint32(data[4:8]) num_extensions := binary.BigEndian.Uint32(data[4:8])
node_type_hash := binary.BigEndian.Uint64(data[8:16]) num_queued_signals := binary.BigEndian.Uint32(data[8:12])
node_type_hash := binary.BigEndian.Uint64(data[12:20])
ptr += NODE_DB_HEADER_LEN ptr += NODE_DB_HEADER_LEN
@ -269,13 +392,20 @@ func NewNodeDB(data []byte) (NodeDB, error) {
ptr += int(EXTENSION_DB_HEADER_LEN + length) ptr += int(EXTENSION_DB_HEADER_LEN + length)
} }
queued_signals := make([]QueuedSignal, num_queued_signals)
for i, _ := range(queued_signals) {
queued_signals[i] = QueuedSignal{}
}
return NodeDB{ return NodeDB{
Header: NodeDBHeader{ Header: NodeDBHeader{
Magic: magic, Magic: magic,
TypeHash: node_type_hash, TypeHash: node_type_hash,
NumExtensions: num_extensions, NumExtensions: num_extensions,
NumQueuedSignals: num_queued_signals,
}, },
Extensions: extensions, Extensions: extensions,
QueuedSignals: queued_signals,
}, nil }, nil
} }
@ -287,7 +417,8 @@ func (header NodeDBHeader) Serialize() []byte {
ret := make([]byte, NODE_DB_HEADER_LEN) ret := make([]byte, NODE_DB_HEADER_LEN)
binary.BigEndian.PutUint32(ret[0:4], header.Magic) binary.BigEndian.PutUint32(ret[0:4], header.Magic)
binary.BigEndian.PutUint32(ret[4:8], header.NumExtensions) binary.BigEndian.PutUint32(ret[4:8], header.NumExtensions)
binary.BigEndian.PutUint64(ret[8:16], header.TypeHash) binary.BigEndian.PutUint32(ret[8:12], header.NumQueuedSignals)
binary.BigEndian.PutUint64(ret[12:20], header.TypeHash)
return ret return ret
} }
@ -324,6 +455,20 @@ type ExtensionDB struct {
} }
// Write multiple nodes to the database in a single transaction // Write multiple nodes to the database in a single transaction
func WriteNode(ctx *Context, node *Node) error {
ctx.Log.Logf("db", "DB_WRITE: %s", node.ID)
bytes, err := node.Serialize()
if err != nil {
return err
}
id_bytes := node.ID.Serialize()
return ctx.DB.Update(func(txn *badger.Txn) error {
return txn.Set(id_bytes, bytes)
})
}
func WriteNodes(context *StateContext) error { func WriteNodes(context *StateContext) error {
err := ValidateStateContext(context, "write", true) err := ValidateStateContext(context, "write", true)
if err != nil { if err != nil {
@ -368,10 +513,13 @@ func WriteNodes(context *StateContext) error {
// Recursively load a node from the database. // Recursively load a node from the database.
func LoadNode(ctx * Context, id NodeID) (*Node, error) { func LoadNode(ctx * Context, id NodeID) (*Node, error) {
ctx.Log.Logf("db", "LOOKING_FOR_NODE: %s", id)
node, exists := ctx.Nodes[id] node, exists := ctx.Nodes[id]
if exists == true { if exists == true {
ctx.Log.Logf("db", "NODE_ALREADY_LOADED: %s", id)
return node,nil return node,nil
} }
ctx.Log.Logf("db", "LOADING_NODE: %s", id)
var bytes []byte var bytes []byte
err := ctx.DB.View(func(txn *badger.Txn) error { err := ctx.DB.View(func(txn *badger.Txn) error {
@ -400,10 +548,15 @@ func LoadNode(ctx * Context, id NodeID) (*Node, error) {
return nil, fmt.Errorf("Tried to load node %s of type 0x%x, which is not a known node type", id, node_db.Header.TypeHash) return nil, fmt.Errorf("Tried to load node %s of type 0x%x, which is not a known node type", id, node_db.Header.TypeHash)
} }
next_signal, timeout_chan := SoonestSignal(node_db.QueuedSignals)
node = &Node{ node = &Node{
ID: id, ID: id,
Type: node_type.Type, Type: node_type.Type,
Extensions: map[ExtType]Extension{}, Extensions: map[ExtType]Extension{},
MsgChan: make(chan Msg, NODE_MSG_CHAN_DEFAULT),
TimeoutChan: timeout_chan,
SignalQueue: node_db.QueuedSignals,
NextSignal: next_signal,
} }
ctx.Nodes[id] = node ctx.Nodes[id] = node
@ -462,6 +615,9 @@ func LoadNode(ctx * Context, id NodeID) (*Node, error) {
} }
ctx.Log.Logf("db", "DB_NODE_LOADED: %s", id) ctx.Log.Logf("db", "DB_NODE_LOADED: %s", id)
go RunNode(ctx, node)
return node, nil return node, nil
} }
@ -605,197 +761,3 @@ func del[K comparable](list []K, val K) []K {
list[idx] = list[len(list)-1] list[idx] = list[len(list)-1]
return list[:len(list)-1] return list[:len(list)-1]
} }
// Add nodes to an existing read context and call nodes_fn with new_nodes locked for read
// Check that the node has read permissions for the nodes, then add them to the read context and call nodes_fn with the nodes locked for read
func UseStates(context *StateContext, principal *Node, new_nodes ACLMap, state_fn StateFn) error {
if principal == nil || new_nodes == nil || state_fn == nil {
return fmt.Errorf("nil passed to UseStates")
}
err := ValidateStateContext(context, "read", false)
if err != nil {
return err
}
if context.Started == false {
context.Started = true
}
new_locks := []*Node{}
_, princ_locked := context.Locked[principal.ID]
if princ_locked == false {
new_locks = append(new_locks, principal)
context.Graph.Log.Logf("mutex", "RLOCKING_PRINC %s", principal.ID.String())
principal.Lock.RLock()
}
princ_permissions, princ_exists := context.Permissions[principal.ID]
new_permissions := ACLMap{}
if princ_exists == true {
for id, info := range(princ_permissions) {
new_permissions[id] = info
}
}
for _, request := range(new_nodes) {
node := request.Node
if node == nil {
return fmt.Errorf("node in request list is nil")
}
id := node.ID
if id != principal.ID {
_, locked := context.Locked[id]
if locked == false {
new_locks = append(new_locks, node)
context.Graph.Log.Logf("mutex", "RLOCKING %s", id.String())
node.Lock.RLock()
}
}
node_permissions, node_exists := new_permissions[id]
if node_exists == false {
node_permissions = ACLInfo{Node: node, Resources: []string{}}
}
for _, resource := range(request.Resources) {
already_granted := false
for _, granted := range(node_permissions.Resources) {
if resource == granted {
already_granted = true
}
}
if already_granted == false {
err := Allowed(context, principal.ID, fmt.Sprintf("%s.read", resource), node)
if err != nil {
for _, n := range(new_locks) {
context.Graph.Log.Logf("mutex", "RUNLOCKING_ON_ERROR %s", id.String())
n.Lock.RUnlock()
}
return err
}
}
}
new_permissions[id] = node_permissions
}
for _, node := range(new_locks) {
context.Locked[node.ID] = node
}
context.Permissions[principal.ID] = new_permissions
err = state_fn(context)
context.Permissions[principal.ID] = princ_permissions
for _, node := range(new_locks) {
context.Graph.Log.Logf("mutex", "RUNLOCKING %s", node.ID.String())
delete(context.Locked, node.ID)
node.Lock.RUnlock()
}
return err
}
// Add nodes to an existing write context and call nodes_fn with nodes locked for read
// If context is nil
func UpdateStates(context *StateContext, principal *Node, new_nodes ACLMap, state_fn StateFn) error {
if principal == nil || new_nodes == nil || state_fn == nil {
return fmt.Errorf("nil passed to UpdateStates")
}
err := ValidateStateContext(context, "write", false)
if err != nil {
return err
}
final := false
if context.Started == false {
context.Started = true
final = true
}
new_locks := []*Node{}
_, princ_locked := context.Locked[principal.ID]
if princ_locked == false {
new_locks = append(new_locks, principal)
context.Graph.Log.Logf("mutex", "LOCKING_PRINC %s", principal.ID.String())
principal.Lock.Lock()
}
princ_permissions, princ_exists := context.Permissions[principal.ID]
new_permissions := ACLMap{}
if princ_exists == true {
for id, info := range(princ_permissions) {
new_permissions[id] = info
}
}
for _, request := range(new_nodes) {
node := request.Node
if node == nil {
return fmt.Errorf("node in request list is nil")
}
id := node.ID
if id != principal.ID {
_, locked := context.Locked[id]
if locked == false {
new_locks = append(new_locks, node)
context.Graph.Log.Logf("mutex", "LOCKING %s", id.String())
node.Lock.Lock()
}
}
node_permissions, node_exists := new_permissions[id]
if node_exists == false {
node_permissions = ACLInfo{Node: node, Resources: []string{}}
}
for _, resource := range(request.Resources) {
already_granted := false
for _, granted := range(node_permissions.Resources) {
if resource == granted {
already_granted = true
}
}
if already_granted == false {
err := Allowed(context, principal.ID, fmt.Sprintf("%s.write", resource), node)
if err != nil {
for _, n := range(new_locks) {
context.Graph.Log.Logf("mutex", "UNLOCKING_ON_ERROR %s", id.String())
n.Lock.Unlock()
}
return err
}
}
}
new_permissions[id] = node_permissions
}
for _, node := range(new_locks) {
context.Locked[node.ID] = node
}
context.Permissions[principal.ID] = new_permissions
err = state_fn(context)
if final == true {
context.Finished = true
if err == nil {
err = WriteNodes(context)
}
for id, node := range(context.Locked) {
context.Graph.Log.Logf("mutex", "UNLOCKING %s", id.String())
node.Lock.Unlock()
}
}
return err
}

6
node_test.go
Unescape Escape View File

@ -10,14 +10,10 @@ func TestNodeDB(t *testing.T) {
err := ctx.RegisterNodeType(node_type, []ExtType{GroupExtType}) err := ctx.RegisterNodeType(node_type, []ExtType{GroupExtType})
fatalErr(t, err) fatalErr(t, err)
node := NewNode(ctx, RandID(), node_type, NewGroupExt(nil)) node := NewNode(ctx, RandID(), node_type, nil, NewGroupExt(nil))
context := NewWriteContext(ctx)
err = UpdateStates(context, node, NewACLInfo(node, []string{"test"}), func(context *StateContext) error {
ser, err := node.Serialize() ser, err := node.Serialize()
ctx.Log.Logf("test", "NODE_SER: %+v", ser) ctx.Log.Logf("test", "NODE_SER: %+v", ser)
return err
})
fatalErr(t, err) fatalErr(t, err)
ctx.Nodes = NodeMap{} ctx.Nodes = NodeMap{}

89
policy.go
Unescape Escape View File

@ -7,15 +7,15 @@ import (
type Policy interface { type Policy interface {
Serializable[PolicyType] Serializable[PolicyType]
Allows(context *StateContext, principal_id NodeID, action string, node *Node) error Allows(principal_id NodeID, action string, node *Node) error
} }
//TODO: Update with change from principal *Node to principal_id so sane policies can still be made //TODO: Update with change from principal *Node to principal_id so sane policies can still be made
func (policy *AllNodesPolicy) Allows(context *StateContext, principal_id NodeID, action string, node *Node) error { func (policy *AllNodesPolicy) Allows(principal_id NodeID, action string, node *Node) error {
return policy.Actions.Allows(action) return policy.Actions.Allows(action)
} }
func (policy *PerNodePolicy) Allows(context *StateContext, principal_id NodeID, action string, node *Node) error { func (policy *PerNodePolicy) Allows(principal_id NodeID, action string, node *Node) error {
for id, actions := range(policy.NodeActions) { for id, actions := range(policy.NodeActions) {
if id != principal_id { if id != principal_id {
continue continue
@ -29,13 +29,13 @@ func (policy *PerNodePolicy) Allows(context *StateContext, principal_id NodeID,
return fmt.Errorf("%s is not in per node policy of %s", principal_id, node.ID) return fmt.Errorf("%s is not in per node policy of %s", principal_id, node.ID)
} }
func (policy *RequirementOfPolicy) Allows(context *StateContext, principal_id NodeID, action string, node *Node) error { func (policy *RequirementOfPolicy) Allows(principal_id NodeID, action string, node *Node) error {
lockable_ext, err := GetExt[*LockableExt](node) lockable_ext, err := GetExt[*LockableExt](node)
if err != nil { if err != nil {
return err return err
} }
for id, _ := range(lockable_ext.Requirements) { for _, id := range(lockable_ext.Requirements) {
if id == principal_id { if id == principal_id {
return policy.Actions.Allows(action) return policy.Actions.Allows(action)
} }
@ -44,36 +44,6 @@ func (policy *RequirementOfPolicy) Allows(context *StateContext, principal_id No
return fmt.Errorf("%s is not a requirement of %s", principal_id, node.ID) return fmt.Errorf("%s is not a requirement of %s", principal_id, node.ID)
} }
func (policy *ParentOfPolicy) Allows(context *StateContext, principal_id NodeID, action string, node *Node) error {
thread_ext, err := GetExt[*ThreadExt](node)
if err != nil {
return err
}
if thread_ext.Parent != nil {
if thread_ext.Parent.ID == principal_id {
return policy.Actions.Allows(action)
}
}
return fmt.Errorf("%s is not a parent of %s", principal_id, node.ID)
}
func (policy *ChildOfPolicy) Allows(context *StateContext, principal_id NodeID, action string, node *Node) error {
thread_ext, err := GetExt[*ThreadExt](node)
if err != nil {
return err
}
for id, _ := range(thread_ext.Children) {
if id == principal_id {
return policy.Actions.Allows(action)
}
}
return fmt.Errorf("%s is not a child of %s", principal_id, node.ID)
}
const RequirementOfPolicyType = PolicyType("REQUIREMENT_OF") const RequirementOfPolicyType = PolicyType("REQUIREMENT_OF")
type RequirementOfPolicy struct { type RequirementOfPolicy struct {
AllNodesPolicy AllNodesPolicy
@ -88,14 +58,6 @@ func NewRequirementOfPolicy(actions Actions) RequirementOfPolicy {
} }
} }
const ChildOfPolicyType = PolicyType("CHILD_OF")
type ChildOfPolicy struct {
AllNodesPolicy
}
func (policy *ChildOfPolicy) Type() PolicyType {
return ChildOfPolicyType
}
type Actions []string type Actions []string
func (actions Actions) Allows(action string) error { func (actions Actions) Allows(action string) error {
@ -153,26 +115,6 @@ func PerNodePolicyLoad(init_fn func(NodeActions)(Policy, error)) func(*Context,
} }
} }
func NewChildOfPolicy(actions Actions) ChildOfPolicy {
return ChildOfPolicy{
AllNodesPolicy: NewAllNodesPolicy(actions),
}
}
const ParentOfPolicyType = PolicyType("PARENT_OF")
type ParentOfPolicy struct {
AllNodesPolicy
}
func (policy *ParentOfPolicy) Type() PolicyType {
return ParentOfPolicyType
}
func NewParentOfPolicy(actions Actions) ParentOfPolicy {
return ParentOfPolicy{
AllNodesPolicy: NewAllNodesPolicy(actions),
}
}
func NewPerNodePolicy(node_actions NodeActions) PerNodePolicy { func NewPerNodePolicy(node_actions NodeActions) PerNodePolicy {
if node_actions == nil { if node_actions == nil {
node_actions = NodeActions{} node_actions = NodeActions{}
@ -268,18 +210,6 @@ func NewACLExtContext() *ACLExtContext {
return &policy, nil return &policy, nil
}), }),
}, },
ParentOfPolicyType: PolicyInfo{
Load: AllNodesPolicyLoad(func(actions Actions)(Policy, error){
policy := NewParentOfPolicy(actions)
return &policy, nil
}),
},
ChildOfPolicyType: PolicyInfo{
Load: AllNodesPolicyLoad(func(actions Actions)(Policy, error){
policy := NewChildOfPolicy(actions)
return &policy, nil
}),
},
RequirementOfPolicyType: PolicyInfo{ RequirementOfPolicyType: PolicyInfo{
Load: AllNodesPolicyLoad(func(actions Actions)(Policy, error){ Load: AllNodesPolicyLoad(func(actions Actions)(Policy, error){
policy := NewRequirementOfPolicy(actions) policy := NewRequirementOfPolicy(actions)
@ -307,8 +237,7 @@ func (ext *ACLExt) Serialize() ([]byte, error) {
}, "", " ") }, "", " ")
} }
func (ext *ACLExt) Process(context *StateContext, node *Node, signal Signal) error { func (ext *ACLExt) Process(ctx *Context, princ_id NodeID, node *Node, signal Signal) {
return nil
} }
func NewACLExt(policies ...Policy) *ACLExt { func NewACLExt(policies ...Policy) *ACLExt {
@ -362,11 +291,11 @@ func (ext *ACLExt) Type() ExtType {
} }
// Check if the extension allows the principal to perform action on node // Check if the extension allows the principal to perform action on node
func (ext *ACLExt) Allows(context *StateContext, principal_id NodeID, action string, node *Node) error { func (ext *ACLExt) Allows(ctx *Context, principal_id NodeID, action string, node *Node) error {
context.Graph.Log.Logf("policy", "POLICY_EXT_ALLOWED: %+v", ext) ctx.Log.Logf("policy", "POLICY_EXT_ALLOWED: %+v", ext)
errs := []error{} errs := []error{}
for _, policy := range(ext.Policies) { for _, policy := range(ext.Policies) {
err := policy.Allows(context, principal_id, action, node) err := policy.Allows(principal_id, action, node)
if err == nil { if err == nil {
return nil return nil
} }

4
signal.go
Unescape Escape View File

@ -55,8 +55,8 @@ func NewDirectSignal(signal_type SignalType) BaseSignal {
return NewBaseSignal(signal_type, Direct) return NewBaseSignal(signal_type, Direct)
} }
var AbortSignal = NewBaseSignal("abort", Down) const StopSignalType = SignalType("STOP")
var StopSignal = NewBaseSignal("stop", Down) var StopSignal = NewDownSignal(StopSignalType)
type IDSignal struct { type IDSignal struct {
BaseSignal BaseSignal

8
user.go
Unescape Escape View File

@ -20,8 +20,8 @@ type ECDHExtJSON struct {
Shared []byte `json:"shared"` Shared []byte `json:"shared"`
} }
func (ext *ECDHExt) Process(context *StateContext, node *Node, signal Signal) error { func (ext *ECDHExt) Process(ctx *Context, princ_id NodeID, node *Node, signal Signal) {
return nil return
} }
const ECDHExtType = ExtType("ECDH") const ECDHExtType = ExtType("ECDH")
@ -115,6 +115,6 @@ func LoadGroupExt(ctx *Context, data []byte) (Extension, error) {
return NewGroupExt(members), nil return NewGroupExt(members), nil
} }
func (ext *GroupExt) Process(context *StateContext, node *Node, signal Signal) error { func (ext *GroupExt) Process(ctx *Context, princ_id NodeID, node *Node, signal Signal) {
return nil return
} }