hipages/php-fpm_exporter

// 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 contains the CLI commands.
package cmd

import (
    "fmt"
    "os"

    "github.com/hipages/php-fpm_exporter/phpfpm"
    homedir "github.com/mitchellh/go-homedir"
    "github.com/sirupsen/logrus"
    "github.com/spf13/cobra"
    "github.com/spf13/viper"
)

var log = logrus.New()

// Version that is being reported by the CLI
var Version string

var cfgFile, logLevel string

// RootCmd represents the base command when called without any subcommands
var RootCmd = &cobra.Command{
    Use:   "php-fpm_exporter",
    Short: "Exports php-fpm metrics for prometheus",
    Long:  `php-fpm_exporter exports prometheus compatible metrics from php-fpm.`,
    // Uncomment the following line if your bare application
    // has an action associated with it:
    //    Run: func(cmd *cobra.Command, args []string) { },
}

// Execute adds all child commands to the root command sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
    if err := RootCmd.Execute(); err != nil {
        fmt.Println(err)
        os.Exit(1)
    }
}

func init() {
    cobra.OnInitialize(initConfig, initLogger)

    RootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.php-fpm_exporter.yaml)")
    RootCmd.PersistentFlags().StringVar(&logLevel, "log.level", "info", "Only log messages with the given severity or above. Valid levels: [debug, info, warn, error, fatal]")
}

// initConfig reads in config file and ENV variables if set.
func initConfig() {
    if cfgFile != "" {
        // Use config file from the flag.
        viper.SetConfigFile(cfgFile)
    } else {
        // Find home directory.
        home, err := homedir.Dir()
        if err != nil {
            fmt.Println(err)
            os.Exit(1)
        }

        // Search config in home directory with name ".php-fpm_exporter" (without extension).
        viper.AddConfigPath(home)
        viper.SetConfigName(".php-fpm_exporter")
    }

    viper.AutomaticEnv() // read in environment variables that match

    // If a config file is found, read it in.
    if err := viper.ReadInConfig(); err == nil {
        fmt.Println("Using config file:", viper.ConfigFileUsed())
    }
}

// initLogger configures the log level
func initLogger() {
    phpfpm.SetLogger(log)

    if value := os.Getenv("PHP_FPM_LOG_LEVEL"); value != "" {
        logLevel = value
    }

    lvl, err := logrus.ParseLevel(logLevel)
    if err != nil {
        lvl = logrus.InfoLevel
        log.Fatalf("Could not set log level to '%v'.", logLevel)
    }

    log.SetLevel(lvl)
}

func mapEnvVars(envs map[string]string, cmd *cobra.Command) {
    for env, flag := range envs {
        flag := cmd.Flags().Lookup(flag)
        flag.Usage = fmt.Sprintf("%v [env %v]", flag.Usage, env)
        if value := os.Getenv(env); value != "" {
            if err := flag.Value.Set(value); err != nil {
                log.Error(err)
            }
        }
    }
}