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// Copyright 2018 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.
//go:build linux
// +build linux
package prometheus
import (
"bytes"
"errors"
"fmt"
"os"
"path/filepath"
"regexp"
"strings"
"testing"
"github.com/prometheus/common/expfmt"
"github.com/prometheus/procfs"
dto "github.com/prometheus/client_model/go"
)
func TestProcessCollector(t *testing.T) {
if _, err := procfs.Self(); err != nil {
t.Skipf("skipping TestProcessCollector, procfs not available: %s", err)
}
registry := NewRegistry()
if err := registry.Register(NewProcessCollector(ProcessCollectorOpts{})); err != nil {
t.Fatal(err)
}
if err := registry.Register(NewProcessCollector(ProcessCollectorOpts{
PidFn: func() (int, error) { return os.Getpid(), nil },
Namespace: "foobar",
ReportErrors: true, // No errors expected, just to see if none are reported.
})); err != nil {
t.Fatal(err)
}
mfs, err := registry.Gather()
if err != nil {
t.Fatal(err)
}
var buf bytes.Buffer
for _, mf := range mfs {
if _, err := expfmt.MetricFamilyToText(&buf, mf); err != nil {
t.Fatal(err)
}
}
for _, re := range []*regexp.Regexp{
regexp.MustCompile("\nprocess_cpu_seconds_total [0-9]"),
regexp.MustCompile("\nprocess_max_fds [1-9]"),
regexp.MustCompile("\nprocess_open_fds [1-9]"),
regexp.MustCompile("\nprocess_virtual_memory_max_bytes (-1|[1-9])"),
regexp.MustCompile("\nprocess_virtual_memory_bytes [1-9]"),
regexp.MustCompile("\nprocess_resident_memory_bytes [1-9]"),
regexp.MustCompile("\nprocess_start_time_seconds [0-9.]{10,}"),
regexp.MustCompile("\nfoobar_process_cpu_seconds_total [0-9]"),
regexp.MustCompile("\nfoobar_process_max_fds [1-9]"),
regexp.MustCompile("\nfoobar_process_open_fds [1-9]"),
regexp.MustCompile("\nfoobar_process_virtual_memory_max_bytes (-1|[1-9])"),
regexp.MustCompile("\nfoobar_process_virtual_memory_bytes [1-9]"),
regexp.MustCompile("\nfoobar_process_resident_memory_bytes [1-9]"),
regexp.MustCompile("\nfoobar_process_start_time_seconds [0-9.]{10,}"),
} {
if !re.Match(buf.Bytes()) {
t.Errorf("want body to match %s\n%s", re, buf.String())
}
}
brokenProcessCollector := NewProcessCollector(ProcessCollectorOpts{
PidFn: func() (int, error) { return 0, errors.New("boo") },
ReportErrors: true,
})
ch := make(chan Metric)
go func() {
brokenProcessCollector.Collect(ch)
close(ch)
}()
n := 0
for m := range ch {
n++
pb := &dto.Metric{}
err := m.Write(pb)
if err == nil {
t.Error("metric collected from broken process collector is unexpectedly valid")
}
}
if n != 1 {
t.Errorf("%d metrics collected, want 1", n)
}
}
func TestNewPidFileFn(t *testing.T) {
folderPath, err := os.Getwd()
if err != nil {
t.Error("failed to get current path")
}
mockPidFilePath := filepath.Join(folderPath, "mockPidFile")
defer os.Remove(mockPidFilePath)
testCases := []struct {
mockPidFile func()
expectedErrPrefix string
expectedPid int
desc string
}{
{
mockPidFile: func() {
os.Remove(mockPidFilePath)
},
expectedErrPrefix: "can't read pid file",
expectedPid: 0,
desc: "no existed pid file",
},
{
mockPidFile: func() {
os.Remove(mockPidFilePath)
f, _ := os.Create(mockPidFilePath)
f.Write([]byte("abc"))
f.Close()
},
expectedErrPrefix: "can't parse pid file",
expectedPid: 0,
desc: "existed pid file, error pid number",
},
{
mockPidFile: func() {
os.Remove(mockPidFilePath)
f, _ := os.Create(mockPidFilePath)
f.Write([]byte("123"))
f.Close()
},
expectedErrPrefix: "",
expectedPid: 123,
desc: "existed pid file, correct pid number",
},
}
for _, tc := range testCases {
fn := NewPidFileFn(mockPidFilePath)
if fn == nil {
t.Error("Should not get nil PidFileFn")
}
tc.mockPidFile()
if pid, err := fn(); pid != tc.expectedPid || (err != nil && !strings.HasPrefix(err.Error(), tc.expectedErrPrefix)) {
fmt.Println(err.Error())
t.Error(tc.desc)
}
}
}
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