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// 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.
// +build !notextfile
package collector
import (
"flag"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"sort"
"strings"
"time"
"github.com/golang/protobuf/proto"
"github.com/prometheus/client_golang/prometheus"
dto "github.com/prometheus/client_model/go"
"github.com/prometheus/common/expfmt"
"github.com/prometheus/common/log"
)
var (
textFileDirectory = flag.String("collector.textfile.directory", "", "Directory to read text files with metrics from.")
)
type textFileCollector struct {
path string
}
func init() {
Factories["textfile"] = NewTextFileCollector
}
// Takes a registers a
// SetMetricFamilyInjectionHook.
func NewTextFileCollector() (Collector, error) {
c := &textFileCollector{
path: *textFileDirectory,
}
if c.path == "" {
// This collector is enabled by default, so do not fail if
// the flag is not passed.
log.Infof("No directory specified, see --collector.textfile.directory")
} else {
prometheus.SetMetricFamilyInjectionHook(c.parseTextFiles)
}
return c, nil
}
// textFile collector works via SetMetricFamilyInjectionHook in parseTextFiles.
func (c *textFileCollector) Update(ch chan<- prometheus.Metric) (err error) {
return nil
}
func (c *textFileCollector) parseTextFiles() []*dto.MetricFamily {
error := 0.0
var metricFamilies []*dto.MetricFamily
mtimes := map[string]time.Time{}
// Iterate over files and accumulate their metrics.
files, err := ioutil.ReadDir(c.path)
if err != nil && c.path != "" {
log.Errorf("Error reading textfile collector directory %s: %s", c.path, err)
error = 1.0
}
for _, f := range files {
if !strings.HasSuffix(f.Name(), ".prom") {
continue
}
path := filepath.Join(c.path, f.Name())
file, err := os.Open(path)
if err != nil {
log.Errorf("Error opening %s: %v", path, err)
error = 1.0
continue
}
var parser expfmt.TextParser
parsedFamilies, err := parser.TextToMetricFamilies(file)
file.Close()
if err != nil {
log.Errorf("Error parsing %s: %v", path, err)
error = 1.0
continue
}
// Only set this once it has been parsed, so that
// a failure does not appear fresh.
mtimes[f.Name()] = f.ModTime()
for _, mf := range parsedFamilies {
if mf.Help == nil {
help := fmt.Sprintf("Metric read from %s", path)
mf.Help = &help
}
metricFamilies = append(metricFamilies, mf)
}
}
// Export the mtimes of the successful files.
if len(mtimes) > 0 {
mtimeMetricFamily := dto.MetricFamily{
Name: proto.String("node_textfile_mtime"),
Help: proto.String("Unixtime mtime of textfiles successfully read."),
Type: dto.MetricType_GAUGE.Enum(),
Metric: []*dto.Metric{},
}
// Sorting is needed for predictable output comparison in tests.
filenames := make([]string, 0, len(mtimes))
for filename := range mtimes {
filenames = append(filenames, filename)
}
sort.Strings(filenames)
for _, filename := range filenames {
mtimeMetricFamily.Metric = append(mtimeMetricFamily.Metric,
&dto.Metric{
Label: []*dto.LabelPair{
{
Name: proto.String("file"),
Value: proto.String(filename),
},
},
Gauge: &dto.Gauge{Value: proto.Float64(float64(mtimes[filename].UnixNano()) / 1e9)},
},
)
}
metricFamilies = append(metricFamilies, &mtimeMetricFamily)
}
// Export if there were errors.
metricFamilies = append(metricFamilies, &dto.MetricFamily{
Name: proto.String("node_textfile_scrape_error"),
Help: proto.String("1 if there was an error opening or reading a file, 0 otherwise"),
Type: dto.MetricType_GAUGE.Enum(),
Metric: []*dto.Metric{
{
Gauge: &dto.Gauge{Value: &error},
},
},
})
return metricFamilies
}
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