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graphvent
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Moved from relay to custom handler with context for gql

graph-rework
noah metz 2023-06-07 21:59:56 -06:00
parent 34cc51d4c8
commit a42104883c
1 changed files with 164 additions and 118 deletions
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282
resource.go
Unescape Escape View File

@ -2,14 +2,14 @@ package main
import (
"fmt"
"io"
"reflect"
"errors"
"sync"
"net/http"
"io"
"github.com/graphql-go/graphql"
"github.com/graphql-go/handler"
"context"
"encoding/json"
)
// Resources propagate update up to multiple parents, and not downwards
@ -260,76 +260,6 @@ func NewResource(name string, description string, children []Resource) * BaseRes
return &resource
}
const graphiql_string string = `
<!--
* Copyright (c) 2021 GraphQL Contributors
* All rights reserved.
*
* This source code is licensed under the license found in the
* LICENSE file in the root directory of this source tree.
-->
<!DOCTYPE html>
<html lang="en">
<head>
<title>GraphiQL</title>
<style>
body {
height: 100%;
margin: 0;
width: 100%;
overflow: hidden;
}
#graphiql {
height: 100vh;
}
</style>
<!--
This GraphiQL example depends on Promise and fetch, which are available in
modern browsers, but can be "polyfilled" for older browsers.
GraphiQL itself depends on React DOM.
If you do not want to rely on a CDN, you can host these files locally or
include them directly in your favored resource bundler.
-->
<script
crossorigin
src="https://unpkg.com/react@18/umd/react.development.js"
></script>
<script
crossorigin
src="https://unpkg.com/react-dom@18/umd/react-dom.development.js"
></script>
<!--
These two files can be found in the npm module, however you may wish to
copy them directly into your environment, or perhaps include them in your
favored resource bundler.
-->
<link rel="stylesheet" href="https://unpkg.com/graphiql/graphiql.min.css" />
</head>
<body>
<div id="graphiql">Loading...</div>
<script
src="https://unpkg.com/graphiql/graphiql.min.js"
type="application/javascript"
></script>
<script>
const root = ReactDOM.createRoot(document.getElementById('graphiql'));
root.render(
React.createElement(GraphiQL, {
fetcher: GraphiQL.createFetcher({
url: 'http://localhost:8080/gql',
}),
defaultEditorToolsVisibility: true,
}),
);
</script>
</body>
</html>
`
type GQLServer struct {
BaseResource
abort chan error
@ -339,7 +269,7 @@ type GQLServer struct {
func NewGQLServer(listen string) * GQLServer {
server := &GQLServer{
BaseResource: NewBaseResource("GQL Connection", "Connection to a GQL server", []Resource{}),
BaseResource: NewBaseResource("GQL Server", "graphql server for event signals", []Resource{}),
listen: listen,
abort: make(chan error, 1),
gql_channel: make(chan error, 1),
@ -367,32 +297,57 @@ func GQLEventChildren(p graphql.ResolveParams) (interface{}, error) {
return nil, errors.New("Failed to cast source to event")
}
func (server * GQLServer) Schema() * graphql.Schema {
valid_events := map[reflect.Type]*graphql.Object{}
gql_interface_event := graphql.NewInterface(graphql.InterfaceConfig{
Name: "Event",
Fields: graphql.Fields{},
ResolveType: func(p graphql.ResolveTypeParams) *graphql.Object {
for key, value := range(valid_events) {
if reflect.TypeOf(p.Value) == key {
return value
var gql_list_event * graphql.List = nil
func GQLListEvent() * graphql.List {
if gql_list_event == nil {
gql_list_event = graphql.NewList(GQLInterfaceEvent())
}
return gql_list_event
}
var gql_interface_event * graphql.Interface = nil
func GQLInterfaceEvent() * graphql.Interface {
if gql_interface_event == nil {
gql_interface_event = graphql.NewInterface(graphql.InterfaceConfig{
Name: "Event",
ResolveType: func(p graphql.ResolveTypeParams) *graphql.Object {
valid_events, ok := p.Context.Value("valid_events").(map[reflect.Type]*graphql.Object)
if ok == false {
return nil
}
}
return nil
},
})
gql_type_event_list := graphql.NewList(gql_interface_event)
gql_interface_event.AddFieldConfig("ID", &graphql.Field{
Type: graphql.String,
})
gql_interface_event.AddFieldConfig("Children", &graphql.Field{
Type: gql_type_event_list,
})
for key, value := range(valid_events) {
if reflect.TypeOf(p.Value) == key {
return value
}
}
return nil
},
Fields: graphql.Fields{},
})
if gql_list_event == nil {
gql_list_event = graphql.NewList(GQLInterfaceEvent())
}
gql_interface_event.AddFieldConfig("ID", &graphql.Field{
Type: graphql.String,
})
gql_interface_event.AddFieldConfig("Children", &graphql.Field{
Type: gql_list_event,
})
}
return gql_interface_event
}
func (server * GQLServer) Handler() func(http.ResponseWriter, *http.Request) {
valid_events := map[reflect.Type]*graphql.Object{}
gql_type_base_event := graphql.NewObject(graphql.ObjectConfig{
Name: "BaseEvent",
Interfaces: []*graphql.Interface{
gql_interface_event,
GQLInterfaceEvent(),
},
IsTypeOf: func(p graphql.IsTypeOfParams) bool {
_, ok := p.Value.(*BaseEvent)
@ -403,27 +358,17 @@ func (server * GQLServer) Schema() * graphql.Schema {
valid_events[reflect.TypeOf((*BaseEvent)(nil))] = gql_type_base_event
gql_type_base_event.AddFieldConfig("ID", &graphql.Field{
Type: graphql.String,
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
if event, ok := p.Source.(Event); ok {
return event.ID(), nil
}
return nil, errors.New("Failed to cast source to event")
},
Resolve: GQLEventID,
})
gql_type_base_event.AddFieldConfig("Children", &graphql.Field{
Type: gql_type_event_list,
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
if event, ok := p.Source.(Event); ok {
return event.Children(), nil
}
return nil, errors.New("Failed to cast source to event")
},
Type: GQLListEvent(),
Resolve: GQLEventChildren,
})
gql_type_event_queue := graphql.NewObject(graphql.ObjectConfig{
Name: "EventQueue",
Interfaces: []*graphql.Interface{
gql_interface_event,
GQLInterfaceEvent(),
},
IsTypeOf: func(p graphql.IsTypeOfParams) bool {
_, ok := p.Value.(*EventQueue)
@ -437,7 +382,7 @@ func (server * GQLServer) Schema() * graphql.Schema {
Resolve: GQLEventID,
})
gql_type_event_queue.AddFieldConfig("Children", &graphql.Field{
Type: gql_type_event_list,
Type: GQLListEvent(),
Resolve: GQLEventChildren,
})
@ -447,7 +392,7 @@ func (server * GQLServer) Schema() * graphql.Schema {
Name: "Query",
Fields: graphql.Fields{
"Event": &graphql.Field{
Type: gql_interface_event,
Type: GQLInterfaceEvent(),
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
server.lock_holder_lock.Lock()
defer server.lock_holder_lock.Unlock()
@ -466,21 +411,122 @@ func (server * GQLServer) Schema() * graphql.Schema {
panic(err)
}
return &schema
return GQLHandler(schema, context.WithValue(context.Background(), "valid_events", valid_events))
}
func GraphiQLHandler() func(http.ResponseWriter, *http.Request) {
graphiql_string := `
<!--
* Copyright (c) 2021 GraphQL Contributors
* All rights reserved.
*
* This source code is licensed under the license found in the
* LICENSE file in the root directory of this source tree.
-->
<!DOCTYPE html>
<html lang="en">
<head>
<title>GraphiQL</title>
<style>
body {
height: 100%;
margin: 0;
width: 100%;
overflow: hidden;
}
#graphiql {
height: 100vh;
}
</style>
<!--
This GraphiQL example depends on Promise and fetch, which are available in
modern browsers, but can be "polyfilled" for older browsers.
GraphiQL itself depends on React DOM.
If you do not want to rely on a CDN, you can host these files locally or
include them directly in your favored resource bundler.
-->
<script
crossorigin
src="https://unpkg.com/react@18/umd/react.development.js"
></script>
<script
crossorigin
src="https://unpkg.com/react-dom@18/umd/react-dom.development.js"
></script>
<!--
These two files can be found in the npm module, however you may wish to
copy them directly into your environment, or perhaps include them in your
favored resource bundler.
-->
<link rel="stylesheet" href="https://unpkg.com/graphiql/graphiql.min.css" />
</head>
<body>
<div id="graphiql">Loading...</div>
<script
src="https://unpkg.com/graphiql/graphiql.min.js"
type="application/javascript"
></script>
<script>
const root = ReactDOM.createRoot(document.getElementById('graphiql'));
root.render(
React.createElement(GraphiQL, {
fetcher: GraphiQL.createFetcher({
url: 'http://localhost:8080/gql',
}),
defaultEditorToolsVisibility: true,
}),
);
</script>
</body>
</html>
`
return func(w http.ResponseWriter, r * http.Request) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.WriteHeader(http.StatusOK)
io.WriteString(w, graphiql_string)
}
}
type GQLQuery struct {
Query string `json:"query"`
}
func GQLHandler(schema graphql.Schema, ctx context.Context) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r * http.Request) {
str, err := io.ReadAll(r.Body)
if err != nil {
log.Logf("gql", "failed to read request body: %s", err)
return
}
res := GQLQuery{}
log.Logf("gql", "GQL_REQ: %s", str)
json.Unmarshal(str, &res)
log.Logf("gql", "GQL_QUERY: %s", res.Query)
result := graphql.Do(graphql.Params{
Schema: schema,
Context: ctx,
RequestString: res.Query,
})
if len(result.Errors) > 0 {
log.Logf("gql", "wrong result, unexpected errors: %v", result.Errors)
}
json.NewEncoder(w).Encode(result)
}
}
func (server * GQLServer) Init(abort chan error) bool {
go func(abort chan error) {
log.Logf("gql", "GOROUTINE_START for %s", server.ID())
h := handler.New(&handler.Config{Schema: server.Schema(), Pretty: true})
mux := http.NewServeMux()
mux.Handle("/gql", h)
mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.WriteHeader(http.StatusOK)
io.WriteString(w, graphiql_string)
})
mux.HandleFunc("/gql", server.Handler())
mux.HandleFunc("/", GraphiQLHandler())
srv := &http.Server{
Addr: server.listen,