64 lines
1.2 KiB
Go
64 lines
1.2 KiB
Go
package fetch
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net/http"
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"time"
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)
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const (
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contentType = "application/json"
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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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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(blockNumber uint64) (FetchResponse, error) {
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var (
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fetchResponse FetchResponse
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)
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resp, err := f.httpClient.Post(
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f.graphqlEndpoint,
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contentType,
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bytes.NewBufferString(fmt.Sprintf(graphqlQuery, blockNumber)),
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)
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if err != nil {
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return FetchResponse{}, err
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}
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if resp.StatusCode != http.StatusOK {
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return FetchResponse{}, fmt.Errorf("error fetching block %s", resp.Status)
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}
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defer resp.Body.Close()
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out, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return FetchResponse{}, nil
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}
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if err := json.Unmarshal(out, &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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