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feat: add suggested changes, tests, and stdin support

Browse source 
Signed-off-by: François Gouteroux <francois.gouteroux@gmail.com>
This commit is contained in:
François Gouteroux 2023-05-23 10:29:17 +02:00
parent b1bab7bc54
commit 3524a16aa0
5 changed files with 251 additions and 134 deletions
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11
cmd/promtool/main.go
View file

@ -81,6 +81,7 @@ func main() {
var (
httpRoundTripper = api.DefaultRoundTripper
serverURL *url.URL
remoteWriteURL *url.URL
httpConfigFilePath string
)
@ -180,12 +181,12 @@ func main() {
pushCmd := app.Command("push", "Push to a Prometheus server.")
pushCmd.Flag("http.config.file", "HTTP client configuration file for promtool to connect to Prometheus.").PlaceHolder("<filename>").ExistingFileVar(&httpConfigFilePath)
pushMetricsCmd := pushCmd.Command("metrics", "Push metrics to a prometheus remote write.")
pushMetricsCmd.Arg("remote-write-url", "Prometheus remote write url to push metrics.").Required().URLVar(&serverURL)
pushMetricsCmd := pushCmd.Command("metrics", "Push metrics to a prometheus remote write (for testing purpose only).")
pushMetricsCmd.Arg("remote-write-url", "Prometheus remote write url to push metrics.").Required().URLVar(&remoteWriteURL)
metricFiles := pushMetricsCmd.Arg(
"metric-files",
"The metric files to push.",
).Required().ExistingFiles()
"The metric files to push, default is read from standard input (STDIN).",
).ExistingFiles()
metricJobLabel := pushMetricsCmd.Flag("job-label", "Job label to attach to metrics.").Default("promtool").String()
pushMetricsTimeout := pushMetricsCmd.Flag("timeout", "The time to wait for pushing metrics.").Default("30s").Duration()
pushMetricsHeaders := pushMetricsCmd.Flag("header", "Prometheus remote write header.").StringMap()
@ -314,7 +315,7 @@ func main() {
os.Exit(CheckMetrics(*checkMetricsExtended))
case pushMetricsCmd.FullCommand():
os.Exit(PushMetrics(serverURL, httpRoundTripper, *pushMetricsHeaders, *pushMetricsTimeout, *metricJobLabel, *metricFiles...))
os.Exit(PushMetrics(remoteWriteURL, httpRoundTripper, *pushMetricsHeaders, *pushMetricsTimeout, *metricJobLabel, *metricFiles...))
case queryInstantCmd.FullCommand():
os.Exit(QueryInstant(serverURL, httpRoundTripper, *queryInstantExpr, *queryInstantTime, p))

147
cmd/promtool/metrics.go
View file

@ -21,22 +21,18 @@ import (
"net/http"
"net/url"
"os"
"sort"
"time"
"github.com/golang/snappy"
dto "github.com/prometheus/client_model/go"
config_util "github.com/prometheus/common/config"
"github.com/prometheus/common/expfmt"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/prompb"
"github.com/prometheus/prometheus/storage/remote"
"github.com/prometheus/prometheus/util/fmtutil"
)
// Push metrics to a prometheus remote write.
// Push metrics to a prometheus remote write (for testing purpose only).
func PushMetrics(url *url.URL, roundTripper http.RoundTripper, headers map[string]string, timeout time.Duration, jobLabel string, files ...string) int {
// remote write should respect specification: https://prometheus.io/docs/concepts/remote_write_spec/
failed := false
addressURL, err := url.Parse(url.String())
@ -67,18 +63,36 @@ func PushMetrics(url *url.URL, roundTripper http.RoundTripper, headers map[strin
headers: headers,
}
for _, f := range files {
// add empty string to avoid matching filename
if len(files) == 0 {
files = append(files, "")
}
for _, file := range files {
var data []byte
var err error
data, err = os.ReadFile(f)
// if file is an empty string it is a stdin
if file == "" {
data, err = io.ReadAll(os.Stdin)
if err != nil {
fmt.Fprintln(os.Stderr, err)
failed = true
break
}
fmt.Printf("Parsing stdin\n")
} else {
data, err = os.ReadFile(file)
if err != nil {
fmt.Fprintln(os.Stderr, err)
failed = true
continue
}
fmt.Printf("Parsing metric file %s\n", f)
metricsData, err := parseMetricsTextAndFormat(bytes.NewReader(data), jobLabel)
fmt.Printf("Parsing metric file %s\n", file)
}
metricsData, err := fmtutil.ParseMetricsTextAndFormat(bytes.NewReader(data), jobLabel)
if err != nil {
fmt.Fprintln(os.Stderr, err)
failed = true
@ -100,7 +114,7 @@ func PushMetrics(url *url.URL, roundTripper http.RoundTripper, headers map[strin
failed = true
continue
}
fmt.Printf("Successfully pushed metric file %s\n", f)
fmt.Printf("Successfully pushed metric file %s\n", file)
}
if failed {
@ -121,114 +135,3 @@ func (s *setHeadersTransport) RoundTrip(req *http.Request) (*http.Response, erro
}
return s.RoundTripper.RoundTrip(req)
}
var MetricMetadataTypeValue = map[string]int32{
"UNKNOWN": 0,
"COUNTER": 1,
"GAUGE": 2,
"HISTOGRAM": 3,
"GAUGEHISTOGRAM": 4,
"SUMMARY": 5,
"INFO": 6,
"STATESET": 7,
}
// formatMetrics convert metric family to a writerequest
func formatMetrics(mf map[string]*dto.MetricFamily, jobLabel string) (*prompb.WriteRequest, error) {
wr := &prompb.WriteRequest{}
// build metric list
sortedMetricNames := make([]string, 0, len(mf))
for metric := range mf {
sortedMetricNames = append(sortedMetricNames, metric)
}
// sort metrics name in lexicographical order
sort.Strings(sortedMetricNames)
for _, metricName := range sortedMetricNames {
// Set metadata writerequest
mtype := MetricMetadataTypeValue[mf[metricName].Type.String()]
metadata := prompb.MetricMetadata{
MetricFamilyName: mf[metricName].GetName(),
Type: prompb.MetricMetadata_MetricType(mtype),
Help: mf[metricName].GetHelp(),
}
wr.Metadata = append(wr.Metadata, metadata)
for _, metric := range mf[metricName].Metric {
var timeserie prompb.TimeSeries
// build labels map
labels := make(map[string]string, len(metric.Label)+2)
labels[model.MetricNameLabel] = metricName
labels[model.JobLabel] = jobLabel
for _, label := range metric.Label {
labelname := label.GetName()
if labelname == model.JobLabel {
labelname = fmt.Sprintf("%s%s", model.ExportedLabelPrefix, labelname)
}
labels[labelname] = label.GetValue()
}
// build labels name list
sortedLabelNames := make([]string, 0, len(labels))
for label := range labels {
sortedLabelNames = append(sortedLabelNames, label)
}
// sort labels name in lexicographical order
sort.Strings(sortedLabelNames)
for _, label := range sortedLabelNames {
timeserie.Labels = append(timeserie.Labels, prompb.Label{
Name: label,
Value: labels[label],
})
}
timeserie.Samples = []prompb.Sample{
{
Timestamp: time.Now().UnixNano() / int64(time.Millisecond),
Value: getMetricsValue(metric),
},
}
wr.Timeseries = append(wr.Timeseries, timeserie)
}
}
return wr, nil
}
// parseMetricsTextReader consumes an io.Reader and returns the MetricFamily
func parseMetricsTextReader(input io.Reader) (map[string]*dto.MetricFamily, error) {
var parser expfmt.TextParser
mf, err := parser.TextToMetricFamilies(input)
if err != nil {
return nil, err
}
return mf, nil
}
// getMetricsValue return the value of a timeserie without the need to give value type
func getMetricsValue(m *dto.Metric) float64 {
switch {
case m.Gauge != nil:
return m.GetGauge().GetValue()
case m.Counter != nil:
return m.GetCounter().GetValue()
case m.Untyped != nil:
return m.GetUntyped().GetValue()
default:
return 0.
}
}
// parseMetricsTextAndFormat return the data in the expected prometheus metrics write request format
func parseMetricsTextAndFormat(input io.Reader, jobLabel string) (*prompb.WriteRequest, error) {
mf, err := parseMetricsTextReader(input)
if err != nil {
return nil, err
}
return formatMetrics(mf, jobLabel)
}

4
docs/command-line/promtool.md
View file

@ -390,7 +390,7 @@ Push to a Prometheus server.
##### `promtool push metrics`
Push metrics to a prometheus remote write.
Push metrics to a prometheus remote write (for testing purpose only).
@ -410,7 +410,7 @@ Push metrics to a prometheus remote write.
| Argument | Description | Required |
| --- | --- | --- |
| remote-write-url | Prometheus remote write url to push metrics. | Yes |
| metric-files | The metric files to push. | Yes |
| metric-files | The metric files to push, default is read from standard input (STDIN). | |

142
util/fmtutil/format.go Normal file
View file

@ -0,0 +1,142 @@
// Copyright 2023 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 fmtutil
import (
"fmt"
"io"
"sort"
"time"
dto "github.com/prometheus/client_model/go"
"github.com/prometheus/common/expfmt"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/prompb"
)
var MetricMetadataTypeValue = map[string]int32{
"UNKNOWN": 0,
"COUNTER": 1,
"GAUGE": 2,
"HISTOGRAM": 3,
"GAUGEHISTOGRAM": 4,
"SUMMARY": 5,
"INFO": 6,
"STATESET": 7,
}
// FormatMetrics convert metric family to a writerequest.
func FormatMetrics(mf map[string]*dto.MetricFamily, jobLabel string) (*prompb.WriteRequest, error) {
wr := &prompb.WriteRequest{}
// build metric list
sortedMetricNames := make([]string, 0, len(mf))
for metric := range mf {
sortedMetricNames = append(sortedMetricNames, metric)
}
// sort metrics name in lexicographical order
sort.Strings(sortedMetricNames)
for _, metricName := range sortedMetricNames {
// Set metadata writerequest
mtype := MetricMetadataTypeValue[mf[metricName].Type.String()]
metadata := prompb.MetricMetadata{
MetricFamilyName: mf[metricName].GetName(),
Type: prompb.MetricMetadata_MetricType(mtype),
Help: mf[metricName].GetHelp(),
}
wr.Metadata = append(wr.Metadata, metadata)
for _, metric := range mf[metricName].Metric {
var timeserie prompb.TimeSeries
// build labels map
labels := make(map[string]string, len(metric.Label)+2)
labels[model.MetricNameLabel] = metricName
labels[model.JobLabel] = jobLabel
for _, label := range metric.Label {
labelname := label.GetName()
if labelname == model.JobLabel {
labelname = fmt.Sprintf("%s%s", model.ExportedLabelPrefix, labelname)
}
labels[labelname] = label.GetValue()
}
// build labels name list
sortedLabelNames := make([]string, 0, len(labels))
for label := range labels {
sortedLabelNames = append(sortedLabelNames, label)
}
// sort labels name in lexicographical order
sort.Strings(sortedLabelNames)
for _, label := range sortedLabelNames {
timeserie.Labels = append(timeserie.Labels, prompb.Label{
Name: label,
Value: labels[label],
})
}
timestamp := metric.GetTimestampMs()
if timestamp == 0 {
timestamp = time.Now().UnixNano() / int64(time.Millisecond)
}
timeserie.Samples = []prompb.Sample{
{
Timestamp: timestamp,
Value: getMetricsValue(metric),
},
}
wr.Timeseries = append(wr.Timeseries, timeserie)
}
}
return wr, nil
}
// getMetricsValue return the value of a timeserie without the need to give value type
func getMetricsValue(m *dto.Metric) float64 {
switch {
case m.Gauge != nil:
return m.GetGauge().GetValue()
case m.Counter != nil:
return m.GetCounter().GetValue()
case m.Untyped != nil:
return m.GetUntyped().GetValue()
default:
return 0.
}
}
// ParseMetricsTextReader consumes an io.Reader and returns the MetricFamily.
func ParseMetricsTextReader(input io.Reader) (map[string]*dto.MetricFamily, error) {
var parser expfmt.TextParser
mf, err := parser.TextToMetricFamilies(input)
if err != nil {
return nil, err
}
return mf, nil
}
// ParseMetricsTextAndFormat return the data in the expected prometheus metrics write request format.
func ParseMetricsTextAndFormat(input io.Reader, jobLabel string) (*prompb.WriteRequest, error) {
mf, err := ParseMetricsTextReader(input)
if err != nil {
return nil, err
}
return FormatMetrics(mf, jobLabel)
}

71
util/fmtutil/format_test.go Normal file
View file

@ -0,0 +1,71 @@
// Copyright 2023 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 fmtutil
import (
"bytes"
"testing"
"github.com/stretchr/testify/require"
"github.com/prometheus/prometheus/prompb"
)
var writeRequestFixture = &prompb.WriteRequest{
Metadata: []prompb.MetricMetadata{
{
MetricFamilyName: "test_metric1",
Type: 2,
Help: "this is a test metric",
},
},
Timeseries: []prompb.TimeSeries{
{
Labels: []prompb.Label{
{Name: "__name__", Value: "test_metric1"},
{Name: "b", Value: "c"},
{Name: "baz", Value: "qux"},
{Name: "d", Value: "e"},
{Name: "foo", Value: "bar"},
{Name: "job", Value: "promtool"},
},
Samples: []prompb.Sample{{Value: 1, Timestamp: 1}},
},
{
Labels: []prompb.Label{
{Name: "__name__", Value: "test_metric1"},
{Name: "b", Value: "c"},
{Name: "baz", Value: "qux"},
{Name: "d", Value: "e"},
{Name: "foo", Value: "bar"},
{Name: "job", Value: "promtool"},
},
Samples: []prompb.Sample{{Value: 2, Timestamp: 1}},
},
},
}
func TestParseMetricsTextAndFormat(t *testing.T) {
input := bytes.NewReader([]byte(`
# HELP test_metric1 this is a test metric
# TYPE test_metric1 gauge
test_metric1{b="c",baz="qux",d="e",foo="bar"} 1 1
test_metric1{b="c",baz="qux",d="e",foo="bar"} 2 1
`))
expected, err := ParseMetricsTextAndFormat(input, "promtool")
require.NoError(t, err)
require.Equal(t, writeRequestFixture, expected)
}