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52 lines
1.9 KiB
52 lines
1.9 KiB
// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package graphql
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import (
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"github.com/ethereum/go-ethereum/internal/ethapi"
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"github.com/ethereum/go-ethereum/node"
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"github.com/graph-gophers/graphql-go"
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"github.com/graph-gophers/graphql-go/relay"
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)
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// New constructs a new GraphQL service instance.
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func New(stack *node.Node, backend ethapi.Backend, cors, vhosts []string) error {
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if backend == nil {
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panic("missing backend")
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}
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// check if http server with given endpoint exists and enable graphQL on it
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return newHandler(stack, backend, cors, vhosts)
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}
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// newHandler returns a new `http.Handler` that will answer GraphQL queries.
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// It additionally exports an interactive query browser on the / endpoint.
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func newHandler(stack *node.Node, backend ethapi.Backend, cors, vhosts []string) error {
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q := Resolver{backend}
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s, err := graphql.ParseSchema(schema, &q)
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if err != nil {
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return err
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}
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h := &relay.Handler{Schema: s}
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handler := node.NewHTTPHandlerStack(h, cors, vhosts)
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stack.RegisterHandler("GraphQL UI", "/graphql/ui", GraphiQL{})
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stack.RegisterHandler("GraphQL", "/graphql", handler)
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stack.RegisterHandler("GraphQL", "/graphql/", handler)
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return nil
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}
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