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t3c-tail.go
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t3c-tail.go
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package main
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
import (
"fmt"
"os"
"regexp"
"time"
"github.com/apache/trafficcontrol/v8/cache-config/t3cutil"
"github.com/apache/trafficcontrol/v8/lib/go-log"
"github.com/nxadm/tail"
"github.com/pborman/getopt/v2"
)
const AppName = "t3c-tail"
// Version is the application version.
// This is overwritten by the build with the current project version.
var Version = "0.4"
// GitRevision is the git revision the application was built from.
// This is overwritten by the build with the current project version.
var GitRevision = "nogit"
// defaultTimeOutMs is 15000 milliseconds, if not included in input.
var defaultTimeOutMs = 15000
func main() {
file := getopt.StringLong("file", 'f', "", "Path to file to watch")
match := getopt.StringLong("match", 'm', ".*", "Regex pattern you want to match while running tail default is .*")
endMatch := getopt.StringLong("end-match", 'e', "^timeout", "Regex pattern that will cause tail to exit before timeout")
timeOutMs := getopt.Int64Long("timeout-ms", 't', int64(defaultTimeOutMs), "Timeout in milliseconds that will cause tail to exit default is 15000 MS")
version := getopt.BoolLong("version", 'V', "Print version information and exit.")
help := getopt.BoolLong("help", 'h', "Print usage information and exit")
getopt.Parse()
log.Init(os.Stderr, os.Stderr, os.Stderr, os.Stderr, os.Stderr)
if *help {
fmt.Println(usageStr())
os.Exit(0)
} else if *version {
fmt.Println(t3cutil.VersionStr(AppName, Version, GitRevision))
os.Exit(0)
}
if *file == "" || file == nil {
fmt.Println("Please provide file path for t3c-tail")
fmt.Println(usageStr())
os.Exit(1)
}
logMatch := regexp.MustCompile(*match)
tailStop := regexp.MustCompile(*endMatch)
timeOut := *timeOutMs
t, err := tail.TailFile(*file,
tail.Config{
MustExist: true,
Follow: true,
Location: &tail.SeekInfo{
Offset: 0,
Whence: 2,
},
})
if err != nil {
log.Errorln("error running tail on ", file, err)
os.Exit(1)
}
timer := time.NewTimer(time.Millisecond * time.Duration(timeOut))
go func() {
for line := range t.Lines {
if logMatch.MatchString(line.Text) {
fmt.Println(line.Text)
}
if tailStop.MatchString(line.Text) {
if !timer.Stop() {
<-timer.C
}
timer.Reset(0)
break
}
}
}()
<-timer.C
t.Cleanup()
}
func usageStr() string {
return `usage: t3c-tail [--help]
-f <path to file> -m <regex to match> -e <regex match to exit> -t <timeout in ms>
file is path to the file you want to tail
match is regex string you wish to match on, default is '.*'
endMatch is a regex used to exit tail when it is found in the logs with out waiting for timeout
timeOutMs is when tail will stop if endMatch isn't found default is 15000
`
}