507 lines
15 KiB
Go
507 lines
15 KiB
Go
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package graphvent
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import (
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"net/http"
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"github.com/graphql-go/graphql"
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"github.com/graphql-go/graphql/language/parser"
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"github.com/graphql-go/graphql/language/source"
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"github.com/graphql-go/graphql/language/ast"
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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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"fmt"
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"sync"
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"github.com/gobwas/ws"
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"github.com/gobwas/ws/wsutil"
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)
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func GraphiQLHandler() func(http.ResponseWriter, *http.Request) {
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return func(w http.ResponseWriter, r * http.Request) {
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graphiql_string := fmt.Sprintf(`
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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: '/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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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 GQLWSPayload struct {
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OperationName string `json:"operationName,omitempty"`
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Query string `json:"query,omitempty"`
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Variables map[string]interface{} `json:"variables,omitempty"`
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Extensions map[string]interface{} `json:"extensions,omitempty"`
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Data string `json:"data,omitempty"`
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}
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type GQLWSMsg struct {
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ID string `json:"id,omitempty"`
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Type string `json:"type"`
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Payload GQLWSPayload `json:"payload,omitempty"`
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}
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func enableCORS(w *http.ResponseWriter) {
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(*w).Header().Set("Access-Control-Allow-Origin", "*")
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(*w).Header().Set("Access-Control-Allow-Credentials", "true")
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(*w).Header().Set("Access-Control-Allow-Headers", "*")
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(*w).Header().Set("Access-Control-Allow-Methods", "*")
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}
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func GQLHandler(ctx * GraphContext, schema graphql.Schema, gql_ctx context.Context) func(http.ResponseWriter, *http.Request) {
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return func(w http.ResponseWriter, r * http.Request) {
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ctx.Log.Logf("gql", "GQL REQUEST: %s", r.RemoteAddr)
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enableCORS(&w)
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header_map := map[string]interface{}{}
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for header, value := range(r.Header) {
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header_map[header] = value
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}
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ctx.Log.Logm("gql", header_map, "REQUEST_HEADERS")
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str, err := io.ReadAll(r.Body)
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if err != nil {
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ctx.Log.Logf("gql", "failed to read request body: %s", err)
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return
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}
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query := GQLWSPayload{}
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json.Unmarshal(str, &query)
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params := graphql.Params{
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Schema: schema,
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Context: gql_ctx,
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RequestString: query.Query,
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}
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if query.OperationName != "" {
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params.OperationName = query.OperationName
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}
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if len(query.Variables) > 0 {
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params.VariableValues = query.Variables
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}
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result := graphql.Do(params)
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if len(result.Errors) > 0 {
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extra_fields := map[string]interface{}{}
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extra_fields["body"] = string(str)
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extra_fields["headers"] = r.Header
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ctx.Log.Logm("gql", extra_fields, "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 sendOneResultAndClose(res *graphql.Result) chan *graphql.Result {
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resultChannel := make(chan *graphql.Result)
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go func() {
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resultChannel <- res
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close(resultChannel)
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}()
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return resultChannel
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}
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func getOperationTypeOfReq(p graphql.Params) string{
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source := source.NewSource(&source.Source{
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Body: []byte(p.RequestString),
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Name: "GraphQL request",
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})
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AST, err := parser.Parse(parser.ParseParams{Source: source})
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if err != nil {
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return ""
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}
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for _, node := range AST.Definitions {
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if operationDef, ok := node.(*ast.OperationDefinition); ok {
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name := ""
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if operationDef.Name != nil {
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name = operationDef.Name.Value
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}
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if name == p.OperationName || p.OperationName == "" {
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return operationDef.Operation
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}
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}
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}
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return ""
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}
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func GQLWSDo(ctx * GraphContext, p graphql.Params) chan *graphql.Result {
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operation := getOperationTypeOfReq(p)
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ctx.Log.Logf("gqlws", "GQLWSDO_OPERATION: %s %+v", operation, p.RequestString)
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if operation == ast.OperationTypeSubscription {
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return graphql.Subscribe(p)
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}
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res := graphql.Do(p)
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return sendOneResultAndClose(res)
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}
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func GQLWSHandler(ctx * GraphContext, schema graphql.Schema, gql_ctx context.Context) func(http.ResponseWriter, *http.Request) {
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return func(w http.ResponseWriter, r * http.Request) {
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ctx.Log.Logf("gqlws_new", "HANDLING %s",r.RemoteAddr)
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header_map := map[string]interface{}{}
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for header, value := range(r.Header) {
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header_map[header] = value
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}
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ctx.Log.Logm("gql", header_map, "REQUEST_HEADERS")
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u := ws.HTTPUpgrader{
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Protocol: func(protocol string) bool {
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ctx.Log.Logf("gqlws", "UPGRADE_PROTOCOL: %s", string(protocol))
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return string(protocol) == "graphql-transport-ws"
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},
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}
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conn, _, _, err := u.Upgrade(r, w)
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if err == nil {
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defer conn.Close()
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conn_state := "init"
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for {
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// TODO: Make this a select between reading client data and getting updates from the event to push to clients"
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msg_raw, op, err := wsutil.ReadClientData(conn)
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ctx.Log.Logf("gqlws_hb", "MSG: %s\nOP: 0x%02x\nERR: %+v\n", string(msg_raw), op, err)
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msg := GQLWSMsg{}
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json.Unmarshal(msg_raw, &msg)
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if err != nil {
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ctx.Log.Logf("gqlws", "WS_CLIENT_ERROR")
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break
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}
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if msg.Type == "connection_init" {
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if conn_state != "init" {
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ctx.Log.Logf("gqlws", "WS_CLIENT_ERROR: INIT WHILE IN %s", conn_state)
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break
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}
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conn_state = "ready"
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err = wsutil.WriteServerMessage(conn, 1, []byte("{\"type\": \"connection_ack\"}"))
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if err != nil {
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ctx.Log.Logf("gqlws", "WS_SERVER_ERROR: FAILED TO SEND connection_ack")
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break
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}
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} else if msg.Type == "ping" {
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ctx.Log.Logf("gqlws_hb", "PING FROM %s", r.RemoteAddr)
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err = wsutil.WriteServerMessage(conn, 1, []byte("{\"type\": \"pong\"}"))
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if err != nil {
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ctx.Log.Logf("gqlws", "WS_SERVER_ERROR: FAILED TO SEND PONG")
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}
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} else if msg.Type == "subscribe" {
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ctx.Log.Logf("gqlws", "SUBSCRIBE: %+v", msg.Payload)
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params := graphql.Params{
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Schema: schema,
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Context: gql_ctx,
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RequestString: msg.Payload.Query,
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}
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if msg.Payload.OperationName != "" {
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params.OperationName = msg.Payload.OperationName
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}
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if len(msg.Payload.Variables) > 0 {
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params.VariableValues = msg.Payload.Variables
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}
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res_chan := GQLWSDo(ctx, params)
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go func(res_chan chan *graphql.Result) {
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for {
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next, ok := <-res_chan
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if ok == false {
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ctx.Log.Logf("gqlws", "response channel was closed")
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return
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}
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if next == nil {
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ctx.Log.Logf("gqlws", "NIL_ON_CHANNEL")
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return
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}
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if len(next.Errors) > 0 {
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extra_fields := map[string]interface{}{}
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extra_fields["query"] = string(msg.Payload.Query)
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ctx.Log.Logm("gqlws", extra_fields, "ERROR: wrong result, unexpected errors: %+v", next.Errors)
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continue
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}
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ctx.Log.Logf("gqlws", "DATA: %+v", next.Data)
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data, err := json.Marshal(next.Data)
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if err != nil {
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ctx.Log.Logf("gqlws", "ERROR: %+v", err)
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continue
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}
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msg, err := json.Marshal(GQLWSMsg{
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ID: msg.ID,
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Type: "next",
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Payload: GQLWSPayload{
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Data: string(data),
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},
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})
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if err != nil {
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ctx.Log.Logf("gqlws", "ERROR: %+v", err)
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continue
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}
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err = wsutil.WriteServerMessage(conn, 1, msg)
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if err != nil {
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ctx.Log.Logf("gqlws", "ERROR: %+v", err)
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continue
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}
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}
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}(res_chan)
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} else {
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}
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}
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return
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} else {
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panic("Failed to upgrade websocket")
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}
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}
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}
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type ObjTypeMap map[reflect.Type]*graphql.Object
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type FieldMap map[string]*graphql.Field
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type GQLThread struct {
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BaseThread
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extended_types ObjTypeMap
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extended_queries FieldMap
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extended_subscriptions FieldMap
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extended_mutations FieldMap
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}
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type GQLThreadState struct {
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BaseThreadState
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Listen string
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}
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func NewGQLThreadState(listen string) GQLThreadState {
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return GQLThreadState{
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BaseThreadState: NewBaseThreadState("GQL Server"),
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Listen: listen,
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}
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}
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var gql_actions ThreadActions = ThreadActions{
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"start": func(ctx * GraphContext, thread Thread) (string, error) {
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ctx.Log.Logf("gql", "SERVER_STARTED")
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server := thread.(*GQLThread)
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go func() {
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ctx.Log.Logf("gql", "GOROUTINE_START for %s", server.ID())
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mux := http.NewServeMux()
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http_handler, ws_handler := MakeGQLHandlers(ctx, server)
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mux.HandleFunc("/gql", http_handler)
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mux.HandleFunc("/gqlws", ws_handler)
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mux.HandleFunc("/graphiql", GraphiQLHandler())
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fs := http.FileServer(http.Dir("./site"))
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mux.Handle("/site/", http.StripPrefix("/site", fs))
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srv_if, _ := UseStates(ctx, []GraphNode{server}, func(states []NodeState)(interface{}, error){
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server_state := states[0].(*GQLThreadState)
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return &http.Server{
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Addr: server_state.Listen,
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Handler: mux,
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}, nil
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})
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srv := srv_if.(*http.Server)
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http_done := &sync.WaitGroup{}
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http_done.Add(1)
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go func(srv *http.Server, http_done *sync.WaitGroup) {
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defer http_done.Done()
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err := srv.ListenAndServe()
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if err != http.ErrServerClosed {
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panic(fmt.Sprintf("Failed to start gql server: %s", err))
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}
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}(srv, http_done)
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for true {
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select {
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case signal:=<-server.signal:
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|
|
if signal.Type() == "abort" || signal.Type() == "cancel" {
|
||
|
|
err := srv.Shutdown(context.Background())
|
||
|
|
if err != nil{
|
||
|
|
panic(fmt.Sprintf("Failed to shutdown gql server: %s", err))
|
||
|
|
}
|
||
|
|
http_done.Wait()
|
||
|
|
break
|
||
|
|
}
|
||
|
|
ctx.Log.Logf("gql", "GOROUTINE_SIGNAL for %s: %+v", server.ID(), signal)
|
||
|
|
// Take signals to resource and send to GQL subscriptions
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}()
|
||
|
|
return "wait", nil
|
||
|
|
},
|
||
|
|
}
|
||
|
|
|
||
|
|
var gql_handlers ThreadHandlers = ThreadHandlers{
|
||
|
|
}
|
||
|
|
|
||
|
|
func NewGQLThread(ctx * GraphContext, listen string, requirements []Lockable, extended_types ObjTypeMap, extended_queries FieldMap, extended_mutations FieldMap, extended_subscriptions FieldMap) (*GQLThread, error) {
|
||
|
|
state := NewGQLThreadState(listen)
|
||
|
|
base_thread, err := NewBaseThread(ctx, gql_actions, gql_handlers, &state)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
thread := &GQLThread {
|
||
|
|
BaseThread: base_thread,
|
||
|
|
extended_types: extended_types,
|
||
|
|
extended_queries: extended_queries,
|
||
|
|
extended_mutations: extended_mutations,
|
||
|
|
extended_subscriptions: extended_subscriptions,
|
||
|
|
}
|
||
|
|
|
||
|
|
err = LinkLockables(ctx, thread, requirements)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
return thread, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func MakeGQLHandlers(ctx * GraphContext, server * GQLThread) (func(http.ResponseWriter, *http.Request), func(http.ResponseWriter, *http.Request)) {
|
||
|
|
valid_nodes := map[reflect.Type]*graphql.Object{}
|
||
|
|
valid_lockables := map[reflect.Type]*graphql.Object{}
|
||
|
|
valid_threads := map[reflect.Type]*graphql.Object{}
|
||
|
|
valid_lockables[reflect.TypeOf((*BaseLockable)(nil))] = GQLTypeBaseNode()
|
||
|
|
for t, v := range(valid_lockables) {
|
||
|
|
valid_nodes[t] = v
|
||
|
|
}
|
||
|
|
valid_threads[reflect.TypeOf((*BaseThread)(nil))] = GQLTypeBaseThread()
|
||
|
|
valid_threads[reflect.TypeOf((*GQLThread)(nil))] = GQLTypeGQLThread()
|
||
|
|
for t, v := range(valid_threads) {
|
||
|
|
valid_lockables[t] = v
|
||
|
|
valid_nodes[t] = v
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
gql_types := []graphql.Type{GQLTypeSignal(), GQLTypeSignalInput()}
|
||
|
|
for _, v := range(valid_nodes) {
|
||
|
|
gql_types = append(gql_types, v)
|
||
|
|
}
|
||
|
|
|
||
|
|
node_type := reflect.TypeOf((GraphNode)(nil))
|
||
|
|
lockable_type := reflect.TypeOf((Lockable)(nil))
|
||
|
|
thread_type := reflect.TypeOf((Thread)(nil))
|
||
|
|
|
||
|
|
for go_t, gql_t := range(server.extended_types) {
|
||
|
|
if go_t.Implements(node_type) {
|
||
|
|
valid_nodes[go_t] = gql_t
|
||
|
|
}
|
||
|
|
if go_t.Implements(lockable_type) {
|
||
|
|
valid_lockables[go_t] = gql_t
|
||
|
|
}
|
||
|
|
if go_t.Implements(thread_type) {
|
||
|
|
valid_threads[go_t] = gql_t
|
||
|
|
}
|
||
|
|
gql_types = append(gql_types, gql_t)
|
||
|
|
}
|
||
|
|
|
||
|
|
gql_queries := graphql.Fields{
|
||
|
|
"Self": GQLQuerySelf(),
|
||
|
|
}
|
||
|
|
|
||
|
|
for key, value := range(server.extended_queries) {
|
||
|
|
gql_queries[key] = value
|
||
|
|
}
|
||
|
|
|
||
|
|
gql_subscriptions := graphql.Fields{
|
||
|
|
"Update": GQLSubscriptionUpdate(),
|
||
|
|
}
|
||
|
|
|
||
|
|
for key, value := range(server.extended_subscriptions) {
|
||
|
|
gql_subscriptions[key] = value
|
||
|
|
}
|
||
|
|
|
||
|
|
gql_mutations := graphql.Fields{
|
||
|
|
"SendUpdate": GQLMutationSendUpdate(),
|
||
|
|
}
|
||
|
|
|
||
|
|
for key, value := range(server.extended_mutations) {
|
||
|
|
gql_mutations[key] = value
|
||
|
|
}
|
||
|
|
|
||
|
|
schemaConfig := graphql.SchemaConfig{
|
||
|
|
Types: gql_types,
|
||
|
|
Query: graphql.NewObject(graphql.ObjectConfig{
|
||
|
|
Name: "Query",
|
||
|
|
Fields: gql_queries,
|
||
|
|
}),
|
||
|
|
Mutation: graphql.NewObject(graphql.ObjectConfig{
|
||
|
|
Name: "Mutation",
|
||
|
|
Fields: gql_mutations,
|
||
|
|
}),
|
||
|
|
Subscription: graphql.NewObject(graphql.ObjectConfig{
|
||
|
|
Name: "Subscription",
|
||
|
|
Fields: gql_subscriptions,
|
||
|
|
}),
|
||
|
|
}
|
||
|
|
|
||
|
|
schema, err := graphql.NewSchema(schemaConfig)
|
||
|
|
if err != nil{
|
||
|
|
panic(err)
|
||
|
|
}
|
||
|
|
gql_ctx := context.Background()
|
||
|
|
gql_ctx = context.WithValue(gql_ctx, "valid_nodes", valid_nodes)
|
||
|
|
gql_ctx = context.WithValue(gql_ctx, "valid_lockables", valid_lockables)
|
||
|
|
gql_ctx = context.WithValue(gql_ctx, "valid_threads", valid_threads)
|
||
|
|
gql_ctx = context.WithValue(gql_ctx, "gql_server", server)
|
||
|
|
gql_ctx = context.WithValue(gql_ctx, "graph_context", ctx)
|
||
|
|
return GQLHandler(ctx, schema, gql_ctx), GQLWSHandler(ctx, schema, gql_ctx)
|
||
|
|
}
|