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decode.go
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46 lines (40 loc) · 922 Bytes
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package multigraphql
import (
"bytes"
"encoding/json"
"fmt"
"io"
"strconv"
"strings"
)
type graphqlResponse struct {
Data map[string]*json.RawMessage
Errors []struct {
Message string
}
}
// Decode parses the GraphQL JSON response
func Decode(r io.Reader, destinations []interface{}) error {
resp := graphqlResponse{}
if err := json.NewDecoder(r).Decode(&resp); err != nil {
return err
}
if len(resp.Errors) > 0 {
messages := []string{}
for _, e := range resp.Errors {
messages = append(messages, e.Message)
}
return fmt.Errorf("GraphQL error: %s", strings.Join(messages, "; "))
}
for alias, value := range resp.Data {
if !strings.HasPrefix(alias, "multi_") {
continue
}
i, _ := strconv.Atoi(strings.TrimPrefix(alias, "multi_"))
dec := json.NewDecoder(bytes.NewReader([]byte(*value)))
if err := dec.Decode(destinations[i]); err != nil {
return err
}
}
return nil
}