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haproxy-rest.go
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haproxy-rest.go
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package main
import (
"github.com/gin-gonic/gin"
"flag"
"io/ioutil"
"fmt"
"encoding/json"
"sync"
"github.com/jcelliott/lumber"
"os"
"strconv"
)
// override the standard Gin-Gonic middleware to add the CORS headers
func CORSMiddleware() gin.HandlerFunc {
return func(c *gin.Context) {
c.Writer.Header().Set("Content-Type", "application/json")
c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
c.Writer.Header().Set("Access-Control-Allow-Headers", "Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization")
}
}
// set some globally used vars
var (
ConfigObj *Config
logFile,_ = lumber.NewFileLogger("/tmp/haproxy-rest.log", lumber.DEBUG, lumber.ROTATE, 1000, 3, 100)
logConsole = lumber.NewConsoleLogger(lumber.DEBUG)
log = lumber.NewMultiLogger()
)
func main() {
// log to console and file
log.Prefix("Haproxy-rest")
log.AddLoggers(logFile, logConsole)
// implicit -h prints out help messages
port := flag.Int("port",10001, "Port/IP to use for the REST interface. Overrides $PORT0 env variable")
configFile := flag.String("configFile", "resources/haproxy_new.cfg", "Location of the target HAproxy config file")
templateFile := flag.String("template", "resources/haproxy_cfg.template", "Template file to build HAproxy config")
binary := flag.String("binary", "/usr/local/bin/haproxy", "Path to the HAproxy binary")
pidFile := flag.String("pidFile", "resources/haproxy-private.pid", "Location of the HAproxy PID file")
flag.Parse()
// some initial example config is loaded
s, err := ioutil.ReadFile("resources/config_example.json")
if err != nil {
panic("Cannot find config file at location")
}
// example is parsed to a configuration object
err = json.Unmarshal(s, &ConfigObj)
if err != nil {
fmt.Println("Error parsing JSON")
} else {
ConfigObj.Mutex = new(sync.RWMutex)
}
if ConfigObj.PidFile != *pidFile {
ConfigObj.PidFile = *pidFile
}
//Create and empty pid file on the specified location, if not already there
if _, err := os.Stat(*pidFile); err == nil {
log.Info("Pid file exists, proceeding with startup..")
} else {
emptyPid := []byte("")
ioutil.WriteFile(*pidFile, emptyPid, 0644)
}
err = RenderConfig(*configFile, *templateFile, ConfigObj)
if err != nil {
log.Error("Error rendering config file")
return
} else {
err = Reload(*binary, *configFile, *pidFile)
if err != nil {
log.Error("Error reloading the HAproxy configuration")
return
}
}
log.Info("Starting REST server")
// initialize the web stack
r := gin.New()
// Global middlewares
r.Use(CORSMiddleware())
r.Use(gin.Logger())
r.Use(gin.Recovery())
v1 := r.Group("/v1")
{
/*
Backend Actions
*/
v1.POST("/backend/:name/:server/weight/:weight", func(c *gin.Context){
backend := c.Params.ByName("name")
server := c.Params.ByName("server")
weight,_ := strconv.Atoi(c.Params.ByName("weight"))
status, err := SetWeight(backend, server, weight)
// check on runtime errors
if err != nil {
c.String(500, err.Error())
} else {
switch status {
case "No such server.\n\n":
c.String(404, status)
case "No such backend.\n\n":
c.String(404, status)
default:
//update the config object with the new weight
ConfigObj = UpdateWeightInConfig(backend, server, weight, ConfigObj)
c.String(200,"Ok")
}
}
})
/*
Stats Actions
*/
// get standard stats output from haproxy
v1.GET("/stats", func(c *gin.Context) {
status, err := GetStats("all")
if err != nil {
c.String(500, err.Error())
} else {
c.JSON(200, status)
}
})
v1.GET("/stats/backend", func(c *gin.Context) {
status, err := GetStats("backend")
if err != nil {
c.String(500, err.Error())
} else {
c.JSON(200, status)
}
})
v1.GET("/stats/frontend", func(c *gin.Context) {
status, err := GetStats("frontend")
if err != nil {
c.String(500, err.Error())
} else {
c.JSON(200, status)
}
})
v1.GET("/stats/server", func(c *gin.Context) {
status, err := GetStats("server")
if err != nil {
c.String(500, err.Error())
} else {
c.JSON(200, status)
}
})
/*
Full Config Actions
*/
// get config file
v1.GET("/config", func(c *gin.Context){
c.JSON(200, ConfigObj)
})
// set config file
v1.POST("/config", func(c *gin.Context){
c.Bind(&ConfigObj)
err = RenderConfig(*configFile, *templateFile, ConfigObj)
if err != nil {
c.String(500, "Error rendering config file")
return
} else {
err = Reload(*binary, *configFile, *pidFile)
if err != nil {
c.String(500, "Error reloading the HAproxy configuration")
return
} else {
c.String(200, "Ok")
}
}
})
/*
Info
*/
// get info on running process
v1.GET("/info", func(c *gin.Context) {
status, err := GetInfo()
if err != nil {
c.String(500, err.Error())
} else {
c.JSON(200, status)
}
})
}
// get the Mesos port to listen on
if *port == 10001 {
envPort := os.Getenv("PORT0")
if envPort != "" { *port, err = strconv.Atoi(envPort) }
}
// Listen and server on port
r.Run("0.0.0.0:" + strconv.Itoa(*port))
}