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// Copyright 2016 Qubit Ltd.
// 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 main
import (
"bytes"
"context"
"fmt"
"net/http"
"os"
"os/exec"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
dto "github.com/prometheus/client_model/go"
"github.com/prometheus/common/expfmt"
log "github.com/sirupsen/logrus"
)
var (
cmdStartsCount = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "expexp_command_starts_total",
Help: "Counts of command starts",
},
[]string{"module"},
)
cmdFailsCount = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "expexp_command_fails_total",
Help: "Count of commands with non-zero exits",
},
[]string{"module"},
)
)
func (c execConfig) GatherWithContext(ctx context.Context, r *http.Request) prometheus.GathererFunc {
return func() ([]*dto.MetricFamily, error) {
var out bytes.Buffer
cmd := exec.CommandContext(ctx, c.Command)
cmd.Args = append(cmd.Args, c.Args...)
uargs, ok := r.URL.Query()["args"]
if ok {
cmd.Args = append(cmd.Args, uargs...)
}
for k, v := range c.Env {
cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", k, v))
}
cmd.Stdout = &out
cmd.Stderr = os.Stderr
errc := make(chan error, 1)
go func() {
cmdStartsCount.WithLabelValues(c.mcfg.name).Inc()
errc <- cmd.Run()
close(errc)
}()
var err error
select {
case err = <-errc:
case <-ctx.Done():
err = ctx.Err()
}
if err != nil {
log.Warnf("Command module %v failed %+v", c.mcfg.name, err)
cmdFailsCount.WithLabelValues(c.mcfg.name).Inc()
if err == context.DeadlineExceeded {
proxyTimeoutCount.WithLabelValues(c.mcfg.name).Inc()
}
return nil, err
}
var prsr expfmt.TextParser
var result []*dto.MetricFamily
mfs, err := prsr.TextToMetricFamilies(&out)
if err != nil {
proxyMalformedCount.WithLabelValues(c.mcfg.name).Inc()
return nil, err
}
for _, mf := range mfs {
result = append(result, mf)
}
return result, nil
}
}
func (c execConfig) ServeHTTP(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
g := c.GatherWithContext(ctx, r)
promhttp.HandlerFor(g, promhttp.HandlerOpts{}).ServeHTTP(w, r)
}
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