/
remote_datasource.go
97 lines (83 loc) · 1.96 KB
/
remote_datasource.go
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package engine
import (
"bytes"
"context"
"encoding/json"
"io"
"net/http"
"github.com/99designs/gqlgen/graphql"
)
var _ DataSource = (*RemoteDataSource)(nil)
type RemoteDataSource struct {
URL string
Client *http.Client
}
func (ds *RemoteDataSource) Process(ctx context.Context, oc *graphql.OperationContext) *graphql.Response {
hc := ds.Client
if hc == nil {
hc = http.DefaultClient
}
ctx = graphql.WithResponseContext(
ctx,
// TODO make configurable
graphql.DefaultErrorPresenter,
graphql.DefaultRecover,
)
type RawParams struct {
Query string `json:"query"`
OperationName string `json:"operationName,omitempty"`
Variables map[string]interface{} `json:"variables,omitempty"`
}
params := &RawParams{
Query: oc.RawQuery,
OperationName: oc.OperationName,
Variables: oc.Variables,
}
b, err := json.Marshal(params)
if err != nil {
graphql.AddError(ctx, err)
return &graphql.Response{
Errors: graphql.GetErrors(ctx),
}
}
req, err := http.NewRequestWithContext(ctx, "POST", ds.URL, bytes.NewBuffer(b))
if err != nil {
graphql.AddError(ctx, err)
return &graphql.Response{
Errors: graphql.GetErrors(ctx),
}
}
req.Header.Add("Content-Type", "application/json")
resp, err := hc.Do(req)
if err != nil {
graphql.AddError(ctx, err)
return &graphql.Response{
Errors: graphql.GetErrors(ctx),
}
}
defer func() {
_ = resp.Body.Close()
}()
b, err = io.ReadAll(resp.Body)
if err != nil {
graphql.AddError(ctx, err)
return &graphql.Response{
Errors: graphql.GetErrors(ctx),
}
}
if resp.StatusCode != http.StatusOK {
graphql.AddErrorf(ctx, "unexpected response code: %d", resp.StatusCode)
return &graphql.Response{
Errors: graphql.GetErrors(ctx),
}
}
gqlResp := &graphql.Response{}
err = json.Unmarshal(b, gqlResp)
if err != nil {
graphql.AddError(ctx, err)
return &graphql.Response{
Errors: graphql.GetErrors(ctx),
}
}
return gqlResp
}