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graphql_client.go
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graphql_client.go
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// Copyright 2020 Coinbase, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package optimism
import (
"bytes"
"context"
"encoding/json"
"io"
"net/http"
"net/url"
"path"
"time"
)
const (
graphQLIdleConnectionTimeout = 30 * time.Second
graphQLMaxIdle = 100
graphQLPath = "graphql"
)
// GraphQLClient is a client used to make graphQL
// queries to geth's graphql endpoint.
type GraphQLClient struct {
client *http.Client
url string
}
// Query makes a query to the graphQL endpoint.
func (g *GraphQLClient) Query(ctx context.Context, input string) (string, error) {
query := map[string]string{
"query": input,
}
jsonValue, err := json.Marshal(query)
if err != nil {
return "", err
}
request, err := http.NewRequestWithContext(
ctx,
http.MethodPost,
g.url,
bytes.NewBuffer(jsonValue),
)
if err != nil {
return "", err
}
response, err := g.client.Do(request)
if err != nil {
return "", err
}
defer response.Body.Close()
data, err := io.ReadAll(response.Body)
if err != nil {
return "", err
}
return string(data), nil
}
func newGraphQLClient(baseURL string, timeout time.Duration) (*GraphQLClient, error) {
// Compute GraphQL Endpoint
u, err := url.Parse(baseURL)
if err != nil {
return nil, err
}
u.Path = path.Join(u.Path, graphQLPath)
// Setup HTTP Client
client := &http.Client{
Timeout: timeout,
}
// Override transport idle connection settings
//
// See this conversation around why `.Clone()` is used here:
// https://github.com/golang/go/issues/26013
customTransport := http.DefaultTransport.(*http.Transport).Clone()
customTransport.IdleConnTimeout = graphQLIdleConnectionTimeout
customTransport.MaxIdleConns = graphQLMaxIdle
customTransport.MaxIdleConnsPerHost = graphQLMaxIdle
client.Transport = customTransport
return &GraphQLClient{
client: client,
url: u.String(),
}, nil
}