104 lines
3.4 KiB
Go
104 lines
3.4 KiB
Go
// 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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"fmt"
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"net"
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"net/http"
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"github.com/ethereum/go-ethereum/internal/ethapi"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/p2p"
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"github.com/ethereum/go-ethereum/rpc"
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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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// Service encapsulates a GraphQL service.
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type Service struct {
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endpoint string // The host:port endpoint for this service.
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cors []string // Allowed CORS domains
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vhosts []string // Recognised vhosts
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timeouts rpc.HTTPTimeouts // Timeout settings for HTTP requests.
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backend ethapi.Backend // The backend that queries will operate on.
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handler http.Handler // The `http.Handler` used to answer queries.
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listener net.Listener // The listening socket.
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}
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// New constructs a new GraphQL service instance.
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func New(backend ethapi.Backend, endpoint string, cors, vhosts []string, timeouts rpc.HTTPTimeouts) (*Service, error) {
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return &Service{
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endpoint: endpoint,
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cors: cors,
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vhosts: vhosts,
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timeouts: timeouts,
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backend: backend,
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}, nil
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}
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// Protocols returns the list of protocols exported by this service.
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func (s *Service) Protocols() []p2p.Protocol { return nil }
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// APIs returns the list of APIs exported by this service.
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func (s *Service) APIs() []rpc.API { return nil }
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// Start is called after all services have been constructed and the networking
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// layer was also initialized to spawn any goroutines required by the service.
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func (s *Service) Start(server *p2p.Server) error {
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var err error
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s.handler, err = newHandler(s.backend)
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if err != nil {
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return err
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}
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if s.listener, err = net.Listen("tcp", s.endpoint); err != nil {
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return err
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}
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go rpc.NewHTTPServer(s.cors, s.vhosts, s.timeouts, s.handler).Serve(s.listener)
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log.Info("GraphQL endpoint opened", "url", fmt.Sprintf("http://%s", s.endpoint))
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return nil
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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(backend ethapi.Backend) (http.Handler, 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 nil, err
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}
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h := &relay.Handler{Schema: s}
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mux := http.NewServeMux()
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mux.Handle("/", GraphiQL{})
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mux.Handle("/graphql", h)
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mux.Handle("/graphql/", h)
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return mux, nil
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}
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// Stop terminates all goroutines belonging to the service, blocking until they
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// are all terminated.
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func (s *Service) Stop() error {
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if s.listener != nil {
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s.listener.Close()
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s.listener = nil
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log.Info("GraphQL endpoint closed", "url", fmt.Sprintf("http://%s", s.endpoint))
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}
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return nil
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}
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