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common.go
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common.go
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// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package prometheus
import (
"fmt"
"io/ioutil"
"net/http"
"time"
"github.com/m3db/m3/src/query/api/v1/handler"
"github.com/golang/snappy"
)
const (
// TODO: get timeouts from configs
maxTimeout = time.Minute
defaultTimeout = time.Second * 15
)
// ParsePromCompressedRequest parses a snappy compressed request from Prometheus
func ParsePromCompressedRequest(r *http.Request) ([]byte, *handler.ParseError) {
body := r.Body
if r.Body == nil {
err := fmt.Errorf("empty request body")
return nil, handler.NewParseError(err, http.StatusBadRequest)
}
defer body.Close()
compressed, err := ioutil.ReadAll(body)
if err != nil {
return nil, handler.NewParseError(err, http.StatusInternalServerError)
}
if len(compressed) == 0 {
return nil, handler.NewParseError(fmt.Errorf("empty request body"), http.StatusBadRequest)
}
reqBuf, err := snappy.Decode(nil, compressed)
if err != nil {
return nil, handler.NewParseError(err, http.StatusBadRequest)
}
return reqBuf, nil
}
// ParseRequestTimeout parses the input request timeout with a default
func ParseRequestTimeout(r *http.Request) (time.Duration, error) {
timeout := r.Header.Get("timeout")
if timeout == "" {
return defaultTimeout, nil
}
duration, err := time.ParseDuration(timeout)
if err != nil {
return 0, fmt.Errorf("%s: invalid 'timeout': %v", handler.ErrInvalidParams, err)
}
if duration > maxTimeout {
return 0, fmt.Errorf("%s: invalid 'timeout': greater than %v", handler.ErrInvalidParams, maxTimeout)
}
return duration, nil
}