远程写入prometheus存储
复制package prome
import (
"bufio"
"bytes"
"context"
"io"
"io/ioutil"
"net/http"
"net/url"
"regexp"
"time"
"github.com/gogo/protobuf/proto"
"github.com/golang/snappy"
"github.com/opentracing-contrib/go-stdlib/nethttp"
opentracing "github.com/opentracing/opentracing-go"
"github.com/pkg/errors"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/pkg/labels"
"github.com/prometheus/prometheus/prompb"
)
type RecoverableError struct {
error
}
type HttpClient struct {
url *url.URL
Client *http.Client
timeout time.Duration
}
var MetricNameRE = regexp.MustCompile(`^[a-zA-Z_:][a-zA-Z0-9_:]*$`)
type MetricPoint struct {
Metric string `json:"metric"` // 指标名称
TagsMap map[string]string `json:"tags"` // 数据标签
Time int64 `json:"time"` // 时间戳，单位是秒
Value float64 `json:"value"` // 内部字段，最终转换之后的float64数值
}
func (c *HttpClient) remoteWritePost(req []byte) error {
httpReq, err := http.NewRequest("POST", c.url.String(), bytes.NewReader(req))
if err != nil {
return err
}
httpReq.Header.Add("Content-Encoding", "snappy")
httpReq.Header.Set("Content-Type", "application/x-protobuf")
httpReq.Header.Set("User-Agent", "opcai")
httpReq.Header.Set("X-Prometheus-Remote-Write-Version", "0.1.0")
ctx, cancel := context.WithTimeout(context.Background(), c.timeout)
defer cancel()
httpReq = httpReq.WithContext(ctx)
if parentSpan := opentracing.SpanFromContext(ctx); parentSpan != nil {
var ht *nethttp.Tracer
httpReq, ht = nethttp.TraceRequest(
parentSpan.Tracer(),
httpReq,
nethttp.OperationName("Remote Store"),
nethttp.ClientTrace(false),
)
defer ht.Finish()
}
httpResp, err := c.Client.Do(httpReq)
if err != nil {
// Errors from Client.Do are from (for example) network errors, so are
// recoverable.
return RecoverableError{err}
}
defer func() {
io.Copy(ioutil.Discard, httpResp.Body)
httpResp.Body.Close()
}()
if httpResp.StatusCode/100 != 2 {
scanner := bufio.NewScanner(io.LimitReader(httpResp.Body, 512))
line := ""
if scanner.Scan() {
line = scanner.Text()
}
err = errors.Errorf("server returned HTTP status %s: %s", httpResp.Status, line)
}
if httpResp.StatusCode/100 == 5 {
return RecoverableError{err}
}
return err
}
func buildWriteRequest(samples []*prompb.TimeSeries) ([]byte, error) {
req := &prompb.WriteRequest{
Timeseries: samples,
}
data, err := proto.Marshal(req)
if err != nil {
return nil, err
}
compressed := snappy.Encode(nil, data)
return compressed, nil
}
type sample struct {
labels labels.Labels
t int64
v float64
}
const (
LABEL_NAME = "__name__"
)
func convertOne(item *MetricPoint) (*prompb.TimeSeries, error) {
pt := prompb.TimeSeries{}
pt.Samples = []prompb.Sample{{}}
s := sample{}
s.t = item.Time
s.v = item.Value
// name
if !MetricNameRE.MatchString(item.Metric) {
return &pt, errors.New("invalid metrics name")
}
nameLs := labels.Label{
Name: LABEL_NAME,
Value: item.Metric,
}
s.labels = append(s.labels, nameLs)
for k, v := range item.TagsMap {
if model.LabelNameRE.MatchString(k) {
ls := labels.Label{
Name: k,
Value: v,
}
s.labels = append(s.labels, ls)
}
}
pt.Labels = labelsToLabelsProto(s.labels, pt.Labels)
// 时间赋值问题,使用毫秒时间戳
tsMs := time.Unix(s.t, 0).UnixNano() / 1e6
pt.Samples[0].Timestamp = tsMs
pt.Samples[0].Value = s.v
return &pt, nil
}
func labelsToLabelsProto(labels labels.Labels, buf []*prompb.Label) []*prompb.Label {
result := buf[:0]
if cap(buf) < len(labels) {
result = make([]*prompb.Label, 0, len(labels))
}
for _, l := range labels {
result = append(result, &prompb.Label{
Name: l.Name,
Value: l.Value,
})
}
return result
}
func (c *HttpClient) RemoteWrite(items []MetricPoint) (err error) {
if len(items) == 0 {
return
}
ts := make([]*prompb.TimeSeries, len(items))
for i := range items {
ts[i], err = convertOne(&items[i])
if err != nil {
return
}
}
data, err := buildWriteRequest(ts)
if err != nil {
return
}
err = c.remoteWritePost(data)
return
}
func NewClient(ur string, timeout time.Duration) (c *HttpClient, err error) {
u, err := url.Parse(ur)
if err != nil {
return
}
c = &HttpClient{
url: u,
Client: &http.Client{},
timeout: timeout,
}
return
}
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THE END
