2023-06-07 22:46:42 -06:00
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package main
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import (
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"net/http"
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"github.com/graphql-go/graphql"
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"context"
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"encoding/json"
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"io"
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"reflect"
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"errors"
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"fmt"
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"sync"
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)
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func GraphiQLHandler() func(http.ResponseWriter, *http.Request) {
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graphiql_string := `
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<!--
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* Copyright (c) 2021 GraphQL Contributors
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* All rights reserved.
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*
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* This source code is licensed under the license found in the
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* LICENSE file in the root directory of this source tree.
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-->
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>GraphiQL</title>
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<style>
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body {
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height: 100%;
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margin: 0;
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width: 100%;
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overflow: hidden;
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}
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#graphiql {
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height: 100vh;
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}
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</style>
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<!--
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This GraphiQL example depends on Promise and fetch, which are available in
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modern browsers, but can be "polyfilled" for older browsers.
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GraphiQL itself depends on React DOM.
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If you do not want to rely on a CDN, you can host these files locally or
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include them directly in your favored resource bundler.
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-->
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<script
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crossorigin
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src="https://unpkg.com/react@18/umd/react.development.js"
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></script>
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<script
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crossorigin
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src="https://unpkg.com/react-dom@18/umd/react-dom.development.js"
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></script>
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<!--
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These two files can be found in the npm module, however you may wish to
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copy them directly into your environment, or perhaps include them in your
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favored resource bundler.
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-->
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<link rel="stylesheet" href="https://unpkg.com/graphiql/graphiql.min.css" />
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</head>
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<body>
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<div id="graphiql">Loading...</div>
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<script
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src="https://unpkg.com/graphiql/graphiql.min.js"
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type="application/javascript"
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></script>
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<script>
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const root = ReactDOM.createRoot(document.getElementById('graphiql'));
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root.render(
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React.createElement(GraphiQL, {
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fetcher: GraphiQL.createFetcher({
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url: 'http://localhost:8080/gql',
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}),
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defaultEditorToolsVisibility: true,
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}),
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);
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</script>
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</body>
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</html>
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`
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return func(w http.ResponseWriter, r * http.Request) {
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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w.WriteHeader(http.StatusOK)
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io.WriteString(w, graphiql_string)
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}
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}
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type GQLQuery struct {
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Query string `json:"query"`
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}
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func GQLHandler(schema graphql.Schema, ctx context.Context) func(http.ResponseWriter, *http.Request) {
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return func(w http.ResponseWriter, r * http.Request) {
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str, err := io.ReadAll(r.Body)
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if err != nil {
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log.Logf("gql", "failed to read request body: %s", err)
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return
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}
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res := GQLQuery{}
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json.Unmarshal(str, &res)
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result := graphql.Do(graphql.Params{
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Schema: schema,
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Context: ctx,
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RequestString: res.Query,
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})
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if len(result.Errors) > 0 {
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log.Logf("gql", "wrong result, unexpected errors: %v", result.Errors)
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}
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json.NewEncoder(w).Encode(result)
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}
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}
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func GQLEventFn(p graphql.ResolveParams, fn func(Event, graphql.ResolveParams)(interface{}, error))(interface{}, error) {
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if event, ok := p.Source.(Event); ok {
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return fn(event, p)
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}
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return nil, errors.New("Failed to cast source to event")
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}
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func GQLEventID(p graphql.ResolveParams) (interface{}, error) {
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return GQLEventFn(p, func(event Event, p graphql.ResolveParams)(interface{}, error) {
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return event.ID(), nil
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})
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}
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func GQLEventName(p graphql.ResolveParams) (interface{}, error) {
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return GQLEventFn(p, func(event Event, p graphql.ResolveParams)(interface{}, error) {
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return event.Name(), nil
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})
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}
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func GQLEventDescription(p graphql.ResolveParams) (interface{}, error) {
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return GQLEventFn(p, func(event Event, p graphql.ResolveParams)(interface{}, error) {
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return event.Description(), nil
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})
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}
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func GQLEventChildren(p graphql.ResolveParams) (interface{}, error) {
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return GQLEventFn(p, func(event Event, p graphql.ResolveParams)(interface{}, error) {
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return event.Children(), nil
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})
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}
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2023-06-08 00:19:55 -06:00
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var gql_list_resource * graphql.List = nil
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func GQLListResource() * graphql.List {
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if gql_list_resource == nil {
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gql_list_resource = graphql.NewList(GQLInterfaceResource())
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}
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return gql_list_resource
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}
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var gql_interface_resource * graphql.Interface = nil
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func GQLInterfaceResource() * graphql.Interface {
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if gql_interface_resource == nil {
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gql_interface_resource = graphql.NewInterface(graphql.InterfaceConfig{
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Name: "Resource",
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ResolveType: func(p graphql.ResolveTypeParams) *graphql.Object {
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valid_resources, ok := p.Context.Value("valid_resources").(map[reflect.Type]*graphql.Object)
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if ok == false {
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return nil
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}
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for key, value := range(valid_resources) {
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if reflect.TypeOf(p.Value) == key {
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return value
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}
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}
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return nil
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},
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Fields: graphql.Fields{},
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})
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if gql_list_resource == nil {
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gql_list_resource = graphql.NewList(gql_interface_resource)
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}
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gql_interface_resource.AddFieldConfig("ID", &graphql.Field{
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Type: graphql.String,
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})
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gql_interface_resource.AddFieldConfig("Name", &graphql.Field{
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Type: graphql.String,
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})
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gql_interface_resource.AddFieldConfig("Description", &graphql.Field{
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Type: graphql.String,
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})
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gql_interface_resource.AddFieldConfig("Parents", &graphql.Field{
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Type: GQLListResource(),
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})
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}
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return gql_interface_resource
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}
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func GQLResourceFn(p graphql.ResolveParams, fn func(Resource, graphql.ResolveParams)(interface{}, error))(interface{}, error) {
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if resource, ok := p.Source.(Resource); ok {
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return fn(resource, p)
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}
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return nil, errors.New(fmt.Sprintf("Failed to cast source to resource, %+v", p.Source))
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}
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func GQLResourceID(p graphql.ResolveParams) (interface{}, error) {
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return GQLResourceFn(p, func(resource Resource, p graphql.ResolveParams) (interface{}, error) {
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return resource.ID(), nil
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})
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}
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func GQLResourceName(p graphql.ResolveParams) (interface{}, error) {
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return GQLResourceFn(p, func(resource Resource, p graphql.ResolveParams) (interface{}, error) {
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return resource.Name(), nil
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})
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}
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func GQLResourceDescription(p graphql.ResolveParams) (interface{}, error) {
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return GQLResourceFn(p, func(resource Resource, p graphql.ResolveParams) (interface{}, error) {
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return resource.Description(), nil
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})
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}
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func GQLResourceParents(p graphql.ResolveParams) (interface{}, error) {
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return GQLResourceFn(p, func(resource Resource, p graphql.ResolveParams) (interface{}, error) {
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return resource.Parents(), nil
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})
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}
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var gql_type_base_resource *graphql.Object = nil
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func GQLTypeBaseResource() * graphql.Object {
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if gql_type_base_resource == nil {
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gql_type_base_resource = graphql.NewObject(graphql.ObjectConfig{
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Name: "BaseResource",
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Interfaces: []*graphql.Interface{
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GQLInterfaceResource(),
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},
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IsTypeOf: func(p graphql.IsTypeOfParams) bool {
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_, ok := p.Value.(*BaseResource)
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return ok
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},
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Fields: graphql.Fields{},
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})
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gql_type_base_resource.AddFieldConfig("ID", &graphql.Field{
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Type: graphql.String,
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Resolve: GQLResourceID,
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})
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gql_type_base_resource.AddFieldConfig("Name", &graphql.Field{
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Type: graphql.String,
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Resolve: GQLResourceName,
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})
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gql_type_base_resource.AddFieldConfig("Description", &graphql.Field{
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Type: graphql.String,
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Resolve: GQLResourceDescription,
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})
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gql_type_base_resource.AddFieldConfig("Parents", &graphql.Field{
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Type: GQLListResource(),
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Resolve: GQLResourceParents,
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})
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}
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return gql_type_base_resource
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}
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2023-06-07 22:46:42 -06:00
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var gql_list_event * graphql.List = nil
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func GQLListEvent() * graphql.List {
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if gql_list_event == nil {
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gql_list_event = graphql.NewList(GQLInterfaceEvent())
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}
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return gql_list_event
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}
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var gql_interface_event * graphql.Interface = nil
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func GQLInterfaceEvent() * graphql.Interface {
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if gql_interface_event == nil {
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gql_interface_event = graphql.NewInterface(graphql.InterfaceConfig{
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Name: "Event",
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ResolveType: func(p graphql.ResolveTypeParams) *graphql.Object {
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valid_events, ok := p.Context.Value("valid_events").(map[reflect.Type]*graphql.Object)
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if ok == false {
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return nil
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}
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for key, value := range(valid_events) {
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if reflect.TypeOf(p.Value) == key {
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return value
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}
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}
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return nil
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},
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Fields: graphql.Fields{},
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})
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if gql_list_event == nil {
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gql_list_event = graphql.NewList(gql_interface_event)
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}
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gql_interface_event.AddFieldConfig("ID", &graphql.Field{
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Type: graphql.String,
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})
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gql_interface_event.AddFieldConfig("Name", &graphql.Field{
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Type: graphql.String,
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})
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gql_interface_event.AddFieldConfig("Description", &graphql.Field{
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Type: graphql.String,
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})
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gql_interface_event.AddFieldConfig("Children", &graphql.Field{
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Type: gql_list_event,
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})
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}
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return gql_interface_event
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}
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var gql_type_base_event * graphql.Object = nil
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func GQLTypeBaseEvent() * graphql.Object {
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if gql_type_base_event == nil {
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gql_type_base_event = graphql.NewObject(graphql.ObjectConfig{
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Name: "BaseEvent",
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Interfaces: []*graphql.Interface{
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GQLInterfaceEvent(),
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},
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IsTypeOf: func(p graphql.IsTypeOfParams) bool {
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_, ok := p.Value.(*BaseEvent)
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return ok
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},
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|
Fields: graphql.Fields{},
|
|
|
|
|
})
|
|
|
|
|
gql_type_base_event.AddFieldConfig("ID", &graphql.Field{
|
|
|
|
|
Type: graphql.String,
|
|
|
|
|
Resolve: GQLEventID,
|
|
|
|
|
})
|
|
|
|
|
|
|
|
|
|
gql_type_base_event.AddFieldConfig("Name", &graphql.Field{
|
|
|
|
|
Type: graphql.String,
|
|
|
|
|
Resolve: GQLEventName,
|
|
|
|
|
})
|
|
|
|
|
|
|
|
|
|
gql_type_base_event.AddFieldConfig("Description", &graphql.Field{
|
|
|
|
|
Type: graphql.String,
|
|
|
|
|
Resolve: GQLEventDescription,
|
|
|
|
|
})
|
|
|
|
|
|
|
|
|
|
gql_type_base_event.AddFieldConfig("Children", &graphql.Field{
|
|
|
|
|
Type: GQLListEvent(),
|
|
|
|
|
Resolve: GQLEventChildren,
|
|
|
|
|
})
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return gql_type_base_event
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
var gql_type_event_queue * graphql.Object = nil
|
|
|
|
|
func GQLTypeEventQueue() * graphql.Object {
|
|
|
|
|
if gql_type_event_queue == nil {
|
|
|
|
|
gql_type_event_queue = graphql.NewObject(graphql.ObjectConfig{
|
|
|
|
|
Name: "EventQueue",
|
|
|
|
|
Interfaces: []*graphql.Interface{
|
|
|
|
|
GQLInterfaceEvent(),
|
|
|
|
|
},
|
|
|
|
|
IsTypeOf: func(p graphql.IsTypeOfParams) bool {
|
|
|
|
|
_, ok := p.Value.(*EventQueue)
|
|
|
|
|
return ok
|
|
|
|
|
},
|
|
|
|
|
Fields: graphql.Fields{},
|
|
|
|
|
})
|
|
|
|
|
gql_type_event_queue.AddFieldConfig("ID", &graphql.Field{
|
|
|
|
|
Type: graphql.String,
|
|
|
|
|
Resolve: GQLEventID,
|
|
|
|
|
})
|
|
|
|
|
gql_type_event_queue.AddFieldConfig("Name", &graphql.Field{
|
|
|
|
|
Type: graphql.String,
|
|
|
|
|
Resolve: GQLEventName,
|
|
|
|
|
})
|
|
|
|
|
gql_type_event_queue.AddFieldConfig("Description", &graphql.Field{
|
|
|
|
|
Type: graphql.String,
|
|
|
|
|
Resolve: GQLEventDescription,
|
|
|
|
|
})
|
|
|
|
|
gql_type_event_queue.AddFieldConfig("Children", &graphql.Field{
|
|
|
|
|
Type: GQLListEvent(),
|
|
|
|
|
Resolve: GQLEventChildren,
|
|
|
|
|
})
|
|
|
|
|
}
|
|
|
|
|
return gql_type_event_queue
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
type GQLServer struct {
|
|
|
|
|
BaseResource
|
|
|
|
|
abort chan error
|
|
|
|
|
listen string
|
|
|
|
|
gql_channel chan error
|
2023-06-07 23:01:06 -06:00
|
|
|
extended_types map[reflect.Type]*graphql.Object
|
2023-06-07 22:46:42 -06:00
|
|
|
}
|
|
|
|
|
|
2023-06-07 23:01:06 -06:00
|
|
|
func NewGQLServer(listen string, extended_types map[reflect.Type]*graphql.Object) * GQLServer {
|
2023-06-07 22:46:42 -06:00
|
|
|
server := &GQLServer{
|
|
|
|
|
BaseResource: NewBaseResource("GQL Server", "graphql server for event signals", []Resource{}),
|
|
|
|
|
listen: listen,
|
|
|
|
|
abort: make(chan error, 1),
|
|
|
|
|
gql_channel: make(chan error, 1),
|
2023-06-07 23:01:06 -06:00
|
|
|
extended_types: extended_types,
|
2023-06-07 22:46:42 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return server
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func (server * GQLServer) update(signal GraphSignal) {
|
|
|
|
|
server.signal <- signal
|
|
|
|
|
server.BaseResource.update(signal)
|
|
|
|
|
}
|
|
|
|
|
|
2023-06-07 23:01:06 -06:00
|
|
|
func (server * GQLServer) Handler() func(http.ResponseWriter, *http.Request) {
|
2023-06-07 22:46:42 -06:00
|
|
|
valid_events := map[reflect.Type]*graphql.Object{}
|
|
|
|
|
valid_events[reflect.TypeOf((*BaseEvent)(nil))] = GQLTypeBaseEvent()
|
|
|
|
|
valid_events[reflect.TypeOf((*EventQueue)(nil))] = GQLTypeEventQueue()
|
|
|
|
|
|
2023-06-08 00:19:55 -06:00
|
|
|
valid_resources := map[reflect.Type]*graphql.Object{}
|
|
|
|
|
valid_resources[reflect.TypeOf((*BaseResource)(nil))] = GQLTypeBaseResource()
|
|
|
|
|
|
2023-06-07 23:01:06 -06:00
|
|
|
gql_types := []graphql.Type{GQLTypeBaseEvent(), GQLTypeEventQueue()}
|
|
|
|
|
for go_t, gql_t := range(server.extended_types) {
|
2023-06-07 22:46:42 -06:00
|
|
|
valid_events[go_t] = gql_t
|
2023-06-07 23:01:06 -06:00
|
|
|
gql_types = append(gql_types, gql_t)
|
2023-06-07 22:46:42 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
schemaConfig := graphql.SchemaConfig{
|
2023-06-07 23:01:06 -06:00
|
|
|
Types: gql_types,
|
2023-06-07 22:46:42 -06:00
|
|
|
Query: graphql.NewObject(graphql.ObjectConfig{
|
|
|
|
|
Name: "Query",
|
|
|
|
|
Fields: graphql.Fields{
|
|
|
|
|
"Owner": &graphql.Field{
|
|
|
|
|
Type: GQLInterfaceEvent(),
|
|
|
|
|
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
|
|
|
|
|
server.lock_holder_lock.Lock()
|
|
|
|
|
defer server.lock_holder_lock.Unlock()
|
|
|
|
|
|
|
|
|
|
owner := server.Owner()
|
|
|
|
|
|
|
|
|
|
return owner, nil
|
|
|
|
|
},
|
|
|
|
|
},
|
|
|
|
|
},
|
|
|
|
|
}),
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
schema, err := graphql.NewSchema(schemaConfig)
|
|
|
|
|
if err != nil{
|
|
|
|
|
panic(err)
|
|
|
|
|
}
|
2023-06-08 00:19:55 -06:00
|
|
|
ctx := context.Background()
|
|
|
|
|
ctx = context.WithValue(ctx, "valid_events", valid_events)
|
|
|
|
|
ctx = context.WithValue(ctx, "valid_resources", valid_resources)
|
|
|
|
|
return GQLHandler(schema, ctx)
|
2023-06-07 22:46:42 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func (server * GQLServer) Init(abort chan error) bool {
|
|
|
|
|
go func(abort chan error) {
|
|
|
|
|
log.Logf("gql", "GOROUTINE_START for %s", server.ID())
|
|
|
|
|
|
|
|
|
|
mux := http.NewServeMux()
|
2023-06-07 23:01:06 -06:00
|
|
|
mux.HandleFunc("/gql", server.Handler())
|
2023-06-07 22:46:42 -06:00
|
|
|
mux.HandleFunc("/", GraphiQLHandler())
|
|
|
|
|
|
|
|
|
|
srv := &http.Server{
|
|
|
|
|
Addr: server.listen,
|
|
|
|
|
Handler: mux,
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
http_done := &sync.WaitGroup{}
|
|
|
|
|
http_done.Add(1)
|
|
|
|
|
go func(srv *http.Server, http_done *sync.WaitGroup) {
|
|
|
|
|
defer http_done.Done()
|
|
|
|
|
err := srv.ListenAndServe()
|
|
|
|
|
if err != http.ErrServerClosed {
|
|
|
|
|
panic(fmt.Sprintf("Failed to start gql server: %s", err))
|
|
|
|
|
}
|
|
|
|
|
}(srv, http_done)
|
|
|
|
|
|
|
|
|
|
for true {
|
|
|
|
|
select {
|
|
|
|
|
case <-abort:
|
|
|
|
|
log.Logf("gql", "GOROUTINE_ABORT for %s", server.ID())
|
|
|
|
|
err := srv.Shutdown(context.Background())
|
|
|
|
|
if err != nil{
|
|
|
|
|
panic(fmt.Sprintf("Failed to shutdown gql server: %s", err))
|
|
|
|
|
}
|
|
|
|
|
http_done.Wait()
|
|
|
|
|
break
|
|
|
|
|
case signal:=<-server.signal:
|
|
|
|
|
log.Logf("gql", "GOROUTINE_SIGNAL for %s: %+v", server.ID(), signal)
|
|
|
|
|
// Take signals to resource and send to GQL subscriptions
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}(abort)
|
|
|
|
|
return true
|
|
|
|
|
}
|
