prometheus/util/httputil/util.go

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// Copyright 2013 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package httputil
import (
"encoding/json"
"io"
"net/http"
"net/url"
"github.com/prometheus/prometheus/promql"
)
// GetQueryParams calls r.ParseForm and returns r.Form.
func GetQueryParams(r *http.Request) url.Values {
r.ParseForm()
return r.Form
}
var jsonFormatVersion = 1
// ErrorJSON writes the given error JSON-formatted to w.
func ErrorJSON(w io.Writer, err error) error {
data := struct {
Type string `json:"type"`
Value string `json:"value"`
Version int `json:"version"`
}{
Type: "error",
Value: err.Error(),
Version: jsonFormatVersion,
}
enc := json.NewEncoder(w)
return enc.Encode(data)
}
// RespondJSON converts the given data value to JSON and writes it to w.
func RespondJSON(w io.Writer, val promql.Value) error {
data := struct {
Type string `json:"type"`
Value interface{} `json:"value"`
Version int `json:"version"`
}{
Type: val.Type().String(),
Value: val,
Version: jsonFormatVersion,
}
// TODO(fabxc): Adding MarshalJSON to promql.Values might be a good idea.
if sc, ok := val.(*promql.Scalar); ok {
data.Value = sc.Value
}
enc := json.NewEncoder(w)
return enc.Encode(data)
}