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// Copyright © 2018 Enrico Stahn <enrico.stahn@gmail.com>
// 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 cmd
import (
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"context"
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"net/http"
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"os"
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"os/signal"
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"syscall"
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"time"
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"github.com/hipages/php-fpm_exporter/phpfpm"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/spf13/cobra"
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)
// Configuration variables
var (
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listeningAddress string
metricsEndpoint string
scrapeURIs [ ] string
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fixProcessCount bool
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)
// serverCmd represents the server command
var serverCmd = & cobra . Command {
Use : "server" ,
Short : "A brief description of your command" ,
Long : ` A longer description that spans multiple lines and likely contains examples
and usage of using your command . For example :
Cobra is a CLI library for Go that empowers applications .
This application is a tool to generate the needed files
to quickly create a Cobra application . ` ,
Run : func ( cmd * cobra . Command , args [ ] string ) {
log . Infof ( "Starting server on %v with path %v" , listeningAddress , metricsEndpoint )
pm := phpfpm . PoolManager { }
for _ , uri := range scrapeURIs {
pm . Add ( uri )
}
exporter := phpfpm . NewExporter ( pm )
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if fixProcessCount {
log . Info ( "Idle/Active/Total Processes will be calculated by php-fpm_exporter." )
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exporter . CountProcessState = true
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}
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prometheus . MustRegister ( exporter )
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srv := & http . Server {
Addr : listeningAddress ,
// Good practice to set timeouts to avoid Slowloris attacks.
WriteTimeout : time . Second * 15 ,
ReadTimeout : time . Second * 15 ,
IdleTimeout : time . Second * 60 ,
}
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http . Handle ( metricsEndpoint , promhttp . Handler ( ) )
http . HandleFunc ( "/" , func ( w http . ResponseWriter , r * http . Request ) {
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_ , err := w . Write ( [ ] byte ( ` < html >
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< head > < title > php - fpm_exporter < / title > < / head >
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< body >
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< h1 > php - fpm_exporter < / h1 >
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< p > < a href = ' ` + metricsEndpoint + ` ' > Metrics < / a > < / p >
< / body >
< / html > ` ) )
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if err != nil {
log . Error ( )
}
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} )
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// Run our server in a goroutine so that it doesn't block.
go func ( ) {
if err := srv . ListenAndServe ( ) ; err != nil {
log . Error ( err )
}
} ( )
c := make ( chan os . Signal , 1 )
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// We'll accept graceful shutdowns when quit via SIGINT (Ctrl+C) or SIGTERM
// SIGKILL, SIGQUIT will not be caught.
signal . Notify ( c , os . Interrupt , syscall . SIGTERM )
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// Block until we receive our signal.
<- c
// Create a deadline to wait for.
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wait := time . Second * 10
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ctx , cancel := context . WithTimeout ( context . Background ( ) , wait )
defer cancel ( )
// Doesn't block if no connections, but will otherwise wait
// until the timeout deadline.
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if err := srv . Shutdown ( ctx ) ; err != nil {
log . Fatal ( "Error during shutdown" , err )
}
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// Optionally, you could run srv.Shutdown in a goroutine and block on
// <-ctx.Done() if your application should wait for other services
// to finalize based on context cancellation.
log . Info ( "Shutting down" )
os . Exit ( 0 )
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} ,
}
func init ( ) {
RootCmd . AddCommand ( serverCmd )
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serverCmd . Flags ( ) . StringVar ( & listeningAddress , "web.listen-address" , ":9253" , "Address on which to expose metrics and web interface." )
serverCmd . Flags ( ) . StringVar ( & metricsEndpoint , "web.telemetry-path" , "/metrics" , "Path under which to expose metrics." )
serverCmd . Flags ( ) . StringSliceVar ( & scrapeURIs , "phpfpm.scrape-uri" , [ ] string { "tcp://127.0.0.1:9000/status" } , "FastCGI address, e.g. unix:///tmp/php.sock;/status or tcp://127.0.0.1:9000/status" )
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serverCmd . Flags ( ) . BoolVar ( & fixProcessCount , "phpfpm.fix-process-count" , false , "Enable to calculate process numbers via php-fpm_exporter since PHP-FPM sporadically reports wrong active/idle/total process numbers." )
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// Workaround since vipers BindEnv is currently not working as expected (see https://github.com/spf13/viper/issues/461)
envs := map [ string ] string {
"PHP_FPM_WEB_LISTEN_ADDRESS" : "web.listen-address" ,
"PHP_FPM_WEB_TELEMETRY_PATH" : "web.telemetry-path" ,
"PHP_FPM_SCRAPE_URI" : "phpfpm.scrape-uri" ,
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"PHP_FPM_FIX_PROCESS_COUNT" : "phpfpm.fix-process-count" ,
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}
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mapEnvVars ( envs , serverCmd )
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}
