prometheus/storage/remote/graphite/client.go
Corentin Chary 7b6c3e556c Use '.' instead of '=' to separate labels from their values in Graphite
Using .label=value. was weird to use in Graphite and didn't bring much value.
2016-01-11 13:57:14 +01:00

108 lines
2.6 KiB
Go

// Copyright 2015 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 graphite
import (
"bytes"
"fmt"
"math"
"net"
"sort"
"time"
"github.com/prometheus/common/log"
"github.com/prometheus/common/model"
)
// Client allows sending batches of Prometheus samples to Graphite.
type Client struct {
address string
transport string
timeout time.Duration
prefix string
}
// NewClient creates a new Client.
func NewClient(address string, transport string, timeout time.Duration, prefix string) *Client {
return &Client{
address: address,
transport: transport,
timeout: timeout,
prefix: prefix,
}
}
func pathFromMetric(m model.Metric, prefix string) string {
var buffer bytes.Buffer
buffer.WriteString(prefix)
buffer.WriteString(escape(m[model.MetricNameLabel]))
// We want to sort the labels.
labels := make(model.LabelNames, 0, len(m))
for l, _ := range m {
labels = append(labels, l)
}
sort.Sort(labels)
// For each label, in order, add ".<label>=<value>".
for _, l := range labels {
v := m[l]
if l == model.MetricNameLabel || len(l) == 0 {
continue
}
// Since we use '.' instead of '=' to separate label and values
// it means that we can't have an '.' in the metric name. Fortunately
// this is prohibited in prometheus metrics.
buffer.WriteString(fmt.Sprintf(
".%s.%s", string(l), escape(v)))
}
return buffer.String()
}
// Store sends a batch of samples to Graphite.
func (c *Client) Store(samples model.Samples) error {
conn, err := net.DialTimeout(c.transport, c.address, c.timeout)
if err != nil {
return err
}
defer conn.Close()
var buf bytes.Buffer
for _, s := range samples {
k := pathFromMetric(s.Metric, c.prefix)
t := float64(s.Timestamp.UnixNano()) / 1e9
v := float64(s.Value)
if math.IsNaN(v) || math.IsInf(v, 0) {
log.Warnf("cannot send value %f to Graphite,"+
"skipping sample %#v", v, s)
continue
}
fmt.Fprintf(&buf, "%s %f %f\n", k, v, t)
}
_, err = conn.Write(buf.Bytes())
if err != nil {
return err
}
return nil
}
// Name identifies the client as a Graphite client.
func (c Client) Name() string {
return "graphite"
}