64 lines
1.4 KiB
Go
64 lines
1.4 KiB
Go
package fetch
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import (
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"net/http"
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"time"
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)
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const (
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graphqlQuery = `{"query":"{block(number:%d){transactions{block{number,timestamp},hash,index,from{address},to{address},value,inputData,status,gasUsed}}}"}`
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)
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type GraphqlOpts struct {
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GraphqlEndpoint string
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}
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type Graphql struct {
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graphqlEndpoint string
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httpClient *http.Client
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}
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func NewGraphqlFetcher(o GraphqlOpts) Fetch {
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return &Graphql{
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httpClient: &http.Client{
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Transport: &http.Transport{
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MaxIdleConns: 100,
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MaxIdleConnsPerHost: 100,
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IdleConnTimeout: 60 * time.Second,
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},
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Timeout: time.Second * 5,
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},
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graphqlEndpoint: o.GraphqlEndpoint,
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}
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}
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func (f *Graphql) Block(ctx context.Context, blockNumber uint64) (FetchResponse, error) {
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fetchResponse := FetchResponse{}
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, f.graphqlEndpoint, bytes.NewBufferString(fmt.Sprintf(graphqlQuery, blockNumber)))
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if err != nil {
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return fetchResponse, err
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}
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req.Header.Set("Content-Type", "application/json")
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resp, err := f.httpClient.Do(req)
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if err != nil {
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return fetchResponse, err
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}
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defer resp.Body.Close()
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if resp.StatusCode >= http.StatusBadRequest {
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return fetchResponse, fmt.Errorf("error fetching block %s", resp.Status)
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}
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if err := json.NewDecoder(resp.Body).Decode(&fetchResponse); err != nil {
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return fetchResponse, err
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}
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return fetchResponse, nil
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}
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