influxdb/influxql/query/response.go

62 lines
1.2 KiB
Go

package query
import (
"encoding/json"
"errors"
)
// Response represents a list of statement results.
type Response struct {
Results []*Result
Err error
}
// MarshalJSON encodes a Response struct into JSON.
func (r Response) MarshalJSON() ([]byte, error) {
// Define a struct that outputs "error" as a string.
var o struct {
Results []*Result `json:"results,omitempty"`
Err string `json:"error,omitempty"`
}
// Copy fields to output struct.
o.Results = r.Results
if r.Err != nil {
o.Err = r.Err.Error()
}
return json.Marshal(&o)
}
// UnmarshalJSON decodes the data into the Response struct.
func (r *Response) UnmarshalJSON(b []byte) error {
var o struct {
Results []*Result `json:"results,omitempty"`
Err string `json:"error,omitempty"`
}
err := json.Unmarshal(b, &o)
if err != nil {
return err
}
r.Results = o.Results
if o.Err != "" {
r.Err = errors.New(o.Err)
}
return nil
}
// Error returns the first error from any statement.
// Returns nil if no errors occurred on any statements.
func (r *Response) Error() error {
if r.Err != nil {
return r.Err
}
for _, rr := range r.Results {
if rr.Err != nil {
return rr.Err
}
}
return nil
}