416 lines
14 KiB
Go
416 lines
14 KiB
Go
package graphvent
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import (
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"github.com/google/uuid"
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"time"
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)
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type ReqState byte
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const (
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Unlocked = ReqState(0)
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Unlocking = ReqState(1)
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Locked = ReqState(2)
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Locking = ReqState(3)
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AbortingLock = ReqState(4)
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)
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var ReqStateStrings = map[ReqState]string {
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Unlocked: "Unlocked",
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Unlocking: "Unlocking",
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Locked: "Locked",
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Locking: "Locking",
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AbortingLock: "AbortingLock",
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}
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type LockableExt struct{
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State ReqState `gv:"state"`
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ReqID *uuid.UUID `gv:"req_id"`
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Owner *NodeID `gv:"owner"`
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PendingOwner *NodeID `gv:"pending_owner"`
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PendingID uuid.UUID `gv:"pending_id"`
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Requirements map[NodeID]ReqState `gv:"requirements"`
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WaitInfos WaitMap `gv:"wait_infos"`
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}
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func (ext *LockableExt) Type() ExtType {
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return LockableExtType
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}
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func NewLockableExt(requirements []NodeID) *LockableExt {
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var reqs map[NodeID]ReqState = nil
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if requirements != nil {
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reqs = map[NodeID]ReqState{}
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for _, id := range(requirements) {
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reqs[id] = Unlocked
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}
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}
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return &LockableExt{
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State: Unlocked,
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Owner: nil,
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PendingOwner: nil,
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Requirements: reqs,
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WaitInfos: WaitMap{},
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}
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}
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func UnlockLockable(ctx *Context, node *Node) (uuid.UUID, error) {
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messages := Messages{}
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signal := NewLockSignal("unlock")
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messages = messages.Add(ctx, node.ID, node, nil, signal)
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return signal.ID(), ctx.Send(messages)
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}
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func LockLockable(ctx *Context, node *Node) (uuid.UUID, error) {
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messages := Messages{}
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signal := NewLockSignal("lock")
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messages = messages.Add(ctx, node.ID, node, nil, signal)
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return signal.ID(), ctx.Send(messages)
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}
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func (ext *LockableExt) HandleErrorSignal(ctx *Context, node *Node, source NodeID, signal *ErrorSignal) (Messages, Changes) {
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var messages Messages = nil
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var changes Changes = nil
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info, info_found := node.ProcessResponse(ext.WaitInfos, signal)
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if info_found {
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state, found := ext.Requirements[info.NodeID]
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if found == true {
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ctx.Log.Logf("lockable", "got mapped response %+v for %+v in state %s", signal, info, ReqStateStrings[state])
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switch state {
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case Locking:
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ext.State = AbortingLock
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ext.Requirements[info.NodeID] = Unlocked
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for id, state := range(ext.Requirements) {
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if state == Locked {
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ext.Requirements[id] = Unlocking
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lock_signal := NewLockSignal("unlock")
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ext.WaitInfos[lock_signal.Id] = node.QueueTimeout(id, lock_signal, 100*time.Millisecond)
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messages = messages.Add(ctx, id, node, nil, lock_signal)
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ctx.Log.Logf("lockable", "sent abort unlock to %s from %s", id, node.ID)
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}
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}
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case Unlocking:
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}
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} else {
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ctx.Log.Logf("lockable", "Got mapped error %s, but %s isn't a requirement", signal, info.NodeID)
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}
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}
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return messages, changes
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}
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func (ext *LockableExt) HandleLinkSignal(ctx *Context, node *Node, source NodeID, signal *LinkSignal) (Messages, Changes) {
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var messages Messages = nil
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var changes Changes = nil
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if ext.State == Unlocked {
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switch signal.Action {
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case "add":
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_, exists := ext.Requirements[signal.NodeID]
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if exists == true {
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messages = messages.Add(ctx, source, node, nil, NewErrorSignal(signal.ID(), "already_requirement"))
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} else {
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if ext.Requirements == nil {
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ext.Requirements = map[NodeID]ReqState{}
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}
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ext.Requirements[signal.NodeID] = Unlocked
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changes.Add(LockableExtType, "requirements")
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messages = messages.Add(ctx, source, node, nil, NewSuccessSignal(signal.ID()))
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}
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case "remove":
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_, exists := ext.Requirements[signal.NodeID]
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if exists == false {
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messages = messages.Add(ctx, source, node, nil, NewErrorSignal(signal.ID(), "can't link: not_requirement"))
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} else {
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delete(ext.Requirements, signal.NodeID)
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changes.Add(LockableExtType, "requirements")
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messages = messages.Add(ctx, source, node, nil, NewSuccessSignal(signal.ID()))
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}
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default:
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messages = messages.Add(ctx, source, node, nil, NewErrorSignal(signal.ID(), "unknown_action"))
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}
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} else {
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messages = messages.Add(ctx, source, node, nil, NewErrorSignal(signal.ID(), "not_unlocked"))
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}
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return messages, changes
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}
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func (ext *LockableExt) HandleSuccessSignal(ctx *Context, node *Node, source NodeID, signal *SuccessSignal) (Messages, Changes) {
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var messages Messages = nil
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var changes Changes = nil
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if source == node.ID {
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return messages, changes
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}
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info, info_found := node.ProcessResponse(ext.WaitInfos, signal)
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if info_found == true {
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state, found := ext.Requirements[info.NodeID]
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if found == false {
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ctx.Log.Logf("lockable", "Got success signal for requirement that is no longer in the map(%s), ignoring...", info.NodeID)
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} else {
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ctx.Log.Logf("lockable", "got mapped response %+v for %+v in state %s", signal, info, ReqStateStrings[state])
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switch state {
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case Locking:
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switch ext.State {
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case Locking:
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ext.Requirements[info.NodeID] = Locked
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locked := 0
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for _, s := range(ext.Requirements) {
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if s == Locked {
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locked += 1
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}
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}
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if locked == len(ext.Requirements) {
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ctx.Log.Logf("lockable", "WHOLE LOCK: %s - %s - %+v", node.ID, ext.PendingID, ext.PendingOwner)
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ext.State = Locked
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ext.Owner = ext.PendingOwner
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changes.Add(LockableExtType, "state", "owner", "requirements")
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messages = messages.Add(ctx, *ext.Owner, node, nil, NewSuccessSignal(ext.PendingID))
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} else {
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changes.Add(LockableExtType, "requirements")
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ctx.Log.Logf("lockable", "PARTIAL LOCK: %s - %d/%d", node.ID, locked, len(ext.Requirements))
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}
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case AbortingLock:
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ext.Requirements[info.NodeID] = Unlocking
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lock_signal := NewLockSignal("unlock")
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ext.WaitInfos[lock_signal.Id] = node.QueueTimeout(info.NodeID, lock_signal, 100*time.Millisecond)
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messages = messages.Add(ctx, info.NodeID, node, nil, lock_signal)
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ctx.Log.Logf("lockable", "sending abort_lock to %s for %s", info.NodeID, node.ID)
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}
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case AbortingLock:
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ctx.Log.Logf("lockable", "Got success signal in AbortingLock %s", node.ID)
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fallthrough
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case Unlocking:
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ext.Requirements[source] = Unlocked
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unlocked := 0
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for _, s := range(ext.Requirements) {
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if s == Unlocked {
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unlocked += 1
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}
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}
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if unlocked == len(ext.Requirements) {
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old_state := ext.State
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ext.State = Unlocked
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ctx.Log.Logf("lockable", "WHOLE UNLOCK: %s - %s - %+v", node.ID, ext.PendingID, ext.PendingOwner)
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if old_state == Unlocking {
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previous_owner := *ext.Owner
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ext.Owner = ext.PendingOwner
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ext.ReqID = nil
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changes.Add(LockableExtType, "state", "owner", "req_id")
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messages = messages.Add(ctx, previous_owner, node, nil, NewSuccessSignal(ext.PendingID))
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} else if old_state == AbortingLock {
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changes.Add(LockableExtType, "state", "pending_owner")
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messages = messages.Add(ctx, *ext.PendingOwner, node, nil, NewErrorSignal(*ext.ReqID, "not_unlocked"))
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ext.PendingOwner = ext.Owner
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}
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} else {
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changes.Add(LockableExtType, "state")
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ctx.Log.Logf("lockable", "PARTIAL UNLOCK: %s - %d/%d", node.ID, unlocked, len(ext.Requirements))
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}
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}
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}
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}
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return messages, changes
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}
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// Handle a LockSignal and update the extensions owner/requirement states
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func (ext *LockableExt) HandleLockSignal(ctx *Context, node *Node, source NodeID, signal *LockSignal) (Messages, Changes) {
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var messages Messages = nil
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var changes Changes = nil
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switch signal.State {
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case "lock":
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switch ext.State {
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case Unlocked:
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if len(ext.Requirements) == 0 {
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ext.State = Locked
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new_owner := source
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ext.PendingOwner = &new_owner
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ext.Owner = &new_owner
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changes.Add(LockableExtType, "state", "pending_owner", "owner")
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messages = messages.Add(ctx, new_owner, node, nil, NewSuccessSignal(signal.ID()))
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} else {
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ext.State = Locking
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id := signal.ID()
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ext.ReqID = &id
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new_owner := source
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ext.PendingOwner = &new_owner
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ext.PendingID = signal.ID()
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changes.Add(LockableExtType, "state", "req_id", "pending_owner", "pending_id")
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for id, state := range(ext.Requirements) {
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if state != Unlocked {
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ctx.Log.Logf("lockable", "REQ_NOT_UNLOCKED_WHEN_LOCKING")
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}
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lock_signal := NewLockSignal("lock")
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ext.WaitInfos[lock_signal.Id] = node.QueueTimeout(id, lock_signal, 100*time.Millisecond)
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ext.Requirements[id] = Locking
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messages = messages.Add(ctx, id, node, nil, lock_signal)
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}
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}
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default:
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messages = messages.Add(ctx, source, node, nil, NewErrorSignal(signal.ID(), "not_unlocked"))
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ctx.Log.Logf("lockable", "Tried to lock %s while locked", node.ID)
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}
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case "unlock":
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if ext.State == Locked {
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if len(ext.Requirements) == 0 {
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ext.State = Unlocked
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new_owner := source
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ext.PendingOwner = nil
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ext.Owner = nil
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changes.Add(LockableExtType, "state", "pending_owner", "owner")
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messages = messages.Add(ctx, new_owner, node, nil, NewSuccessSignal(signal.ID()))
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} else if source == *ext.Owner {
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ext.State = Unlocking
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id := signal.ID()
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ext.ReqID = &id
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ext.PendingOwner = nil
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ext.PendingID = signal.ID()
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changes.Add(LockableExtType, "state", "pending_owner", "pending_id", "req_id")
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for id, state := range(ext.Requirements) {
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if state != Locked {
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ctx.Log.Logf("lockable", "REQ_NOT_LOCKED_WHEN_UNLOCKING")
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}
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lock_signal := NewLockSignal("unlock")
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ext.WaitInfos[lock_signal.Id] = node.QueueTimeout(id, lock_signal, 100*time.Millisecond)
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ext.Requirements[id] = Unlocking
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messages = messages.Add(ctx, id, node, nil, lock_signal)
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}
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}
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} else {
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messages = messages.Add(ctx, source, node, nil, NewErrorSignal(signal.ID(), "not_locked"))
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}
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default:
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ctx.Log.Logf("lockable", "LOCK_ERR: unkown state %s", signal.State)
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}
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return messages, changes
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}
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func (ext *LockableExt) HandleTimeoutSignal(ctx *Context, node *Node, source NodeID, signal *TimeoutSignal) (Messages, Changes) {
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var messages Messages = nil
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var changes Changes = nil
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wait_info, found := node.ProcessResponse(ext.WaitInfos, signal)
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if found == true {
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state, found := ext.Requirements[wait_info.NodeID]
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if found == true {
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ctx.Log.Logf("lockable", "%s timed out %s", wait_info.NodeID, ReqStateStrings[state])
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switch state {
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case Locking:
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ext.State = AbortingLock
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ext.Requirements[wait_info.NodeID] = Unlocked
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for id, state := range(ext.Requirements) {
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if state == Locked {
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ext.Requirements[id] = Unlocking
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lock_signal := NewLockSignal("unlock")
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ext.WaitInfos[lock_signal.Id] = node.QueueTimeout(id, lock_signal, 100*time.Millisecond)
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messages = messages.Add(ctx, id, node, nil, lock_signal)
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ctx.Log.Logf("lockable", "sent abort unlock to %s from %s", id, node.ID)
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}
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}
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case Unlocking:
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}
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} else {
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ctx.Log.Logf("lockable", "%s timed out", wait_info.NodeID)
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}
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}
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return messages, changes
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}
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// LockableExts process Up/Down signals by forwarding them to owner, dependency, and requirement nodes
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// LockSignal and LinkSignal Direct signals are processed to update the requirement/dependency/lock state
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func (ext *LockableExt) Process(ctx *Context, node *Node, source NodeID, signal Signal) (Messages, Changes) {
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var messages Messages = nil
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var changes Changes = nil
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switch signal.Direction() {
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case Up:
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if ext.Owner != nil {
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if *ext.Owner != node.ID {
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messages = messages.Add(ctx, *ext.Owner, node, nil, signal)
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}
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}
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case Down:
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for requirement := range(ext.Requirements) {
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messages = messages.Add(ctx, requirement, node, nil, signal)
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}
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case Direct:
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switch sig := signal.(type) {
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case *LinkSignal:
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messages, changes = ext.HandleLinkSignal(ctx, node, source, sig)
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case *LockSignal:
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messages, changes = ext.HandleLockSignal(ctx, node, source, sig)
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case *ErrorSignal:
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messages, changes = ext.HandleErrorSignal(ctx, node, source, sig)
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case *SuccessSignal:
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messages, changes = ext.HandleSuccessSignal(ctx, node, source, sig)
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case *TimeoutSignal:
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messages, changes = ext.HandleTimeoutSignal(ctx, node, source, sig)
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default:
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}
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default:
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}
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return messages, changes
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}
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type RequirementOfPolicy struct {
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PerNodePolicy
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}
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func NewRequirementOfPolicy(dep_rules map[NodeID]Tree) RequirementOfPolicy {
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return RequirementOfPolicy {
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PerNodePolicy: NewPerNodePolicy(dep_rules),
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}
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}
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func (policy RequirementOfPolicy) ContinueAllows(ctx *Context, current PendingACL, signal Signal) RuleResult {
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sig, ok := signal.(*ReadResultSignal)
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if ok == false {
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return Deny
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}
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ext, ok := sig.Extensions[LockableExtType]
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if ok == false {
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return Deny
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}
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reqs_ser, ok := ext["requirements"]
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if ok == false {
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return Deny
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}
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reqs_type, _, err := DeserializeType(ctx, reqs_ser.TypeStack)
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if err != nil {
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return Deny
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}
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reqs_if, _, err := DeserializeValue(ctx, reqs_type, reqs_ser.Data)
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if err != nil {
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return Deny
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}
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requirements, ok := reqs_if.Interface().(map[NodeID]ReqState)
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if ok == false {
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return Deny
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}
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for req := range(requirements) {
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if req == current.Principal {
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return policy.NodeRules[sig.NodeID].Allows(current.Action)
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}
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}
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return Deny
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}
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