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