forked from signal18/replication-manager
/
runtime.go
262 lines (211 loc) · 5.66 KB
/
runtime.go
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// replication-manager - Replication Manager Monitoring and CLI for MariaDB and MySQL
// Copyright 2017 Signal 18 SARL
// Authors: Guillaume Lefranc <guillaume@signal18.io>
// Stephane Varoqui <svaroqui@gmail.com>
// This source code is licensed under the GNU General Public License, version 3.
package haproxy
import (
"bufio"
"bytes"
"encoding/json"
"errors"
"fmt"
"github.com/signal18/replication-manager/misc"
"io/ioutil"
"log"
"net"
"os"
"os/exec"
"regexp"
"strconv"
"strings"
)
// returns an error if the file was already there
func (r *Runtime) SetPid(pidfile string) error {
//Create and empty pid file on the specified location, if not already there
if _, err := os.Stat(pidfile); err != nil {
emptyPid := []byte("")
ioutil.WriteFile(pidfile, emptyPid, 0644)
return nil
}
return errors.New("file already there")
}
// Reload runtime with configuration
func (r *Runtime) Reload(c *Config) error {
pid, err := ioutil.ReadFile(c.PidFile)
if err != nil {
return err
}
/* Setup all the command line parameters so we get an executable similar to
/usr/local/bin/haproxy -f resources/haproxy_new.cfg -p resources/haproxy-private.pid -sf 1234
*/
arg0 := "-f"
arg1 := c.ConfigFile
arg2 := "-p"
arg3 := c.PidFile
arg4 := "-D"
arg5 := "-sf"
arg6 := strings.Trim(string(pid), "\n")
var cmd *exec.Cmd
// fmt.Println(r.Binary + " " + arg0 + " " + arg1 + " " + arg2 + " " + arg3 + " " + arg4 + " " + arg5 + " " + arg6)
// If this is the first run, the PID value will be empty, otherwise it will be > 0
if len(arg6) > 0 {
log.Printf("Haproxy reloading %s %s %s %s %s %s %s %s", r.Binary, arg0, arg1, arg2, arg3, arg4, arg5, arg6)
cmd = exec.Command(r.Binary, arg0, arg1, arg2, arg3, arg4, arg5, arg6)
} else {
log.Printf("Haproxy starting %s %s %s %s %s %s", r.Binary, arg0, arg1, arg2, arg3, arg4)
cmd = exec.Command(r.Binary, arg0, arg1, arg2, arg3, arg4)
}
var out bytes.Buffer
cmd.Stdout = &out
cmdErr := cmd.Run()
if cmdErr != nil {
return cmdErr
}
return nil
}
// Sets the weight of a backend
func (r *Runtime) SetWeight(backend string, server string, weight int) (string, error) {
result, err := r.cmd("set weight " + backend + "/" + server + " " + strconv.Itoa(weight) + "\n")
if err != nil {
return "", err
} else {
return result, nil
}
}
// Adds an ACL.
// We need to match a frontend name to an id. This is somewhat awkard.
// func (r *Runtime) SetAcl(frontend string, acl string, pattern string) (string, error) {
// result, err := r.cmd("add acl " + acl + pattern)
// if err != nil {
// return "", err
// } else {
// return result, nil
// }
// }
// Gets basic info on haproxy process
func (r *Runtime) GetInfo() (Info, *Error) {
var Info Info
result, err := r.cmd("show info \n")
if err != nil {
return Info, &Error{500, errors.New("Error getting info")}
} else {
result, err := misc.MultiLineToJson(result)
if err != nil {
return Info, &Error{500, err}
} else {
err := json.Unmarshal([]byte(result), &Info)
if err != nil {
return Info, &Error{500, err}
} else {
return Info, nil
}
}
}
}
/* get the basic stats in CSV format
@parameter statsType takes the form of:
- all
- frontend
- backend
Returns a struct. This one is only used by the frontend API
*/
func (r *Runtime) GetJsonStats(statsType string) ([]Stats, error) {
var Stats []Stats
var cmdString string
defer func() error {
if r := recover(); r != nil {
return errors.New("Cannot read from Haproxy socket")
}
return nil
}()
switch statsType {
case "all":
cmdString = "show stat -1\n"
case "backend":
cmdString = "show stat -1 2 -1\n"
case "frontend":
cmdString = "show stat -1 1 -1\n"
case "server":
cmdString = "show stat -1 4 -1\n"
}
result, err := r.cmd(cmdString)
if err != nil {
return Stats, err
} else {
result, err := misc.CsvToJson(strings.Trim(removeStatsLines(result), "# "))
if err != nil {
return Stats, err
} else {
err := json.Unmarshal([]byte(result), &Stats)
if err != nil {
return Stats, err
} else {
return Stats, nil
}
}
}
}
/* get the basic stats in CSV format
@parameter statsType takes the form of:
- all
- frontend
- backend
returns a map of a map of strings with all metrics per proxy, i.e:
["my_service"]["scur"] = 0
["slim"] = 10000
....
*/
func (r *Runtime) GetStats(statsType string) (map[string]map[string]string, error) {
var cmdString string
m := make(map[string]map[string]string)
switch statsType {
case "all":
cmdString = "show stat -1\n"
case "backend":
cmdString = "show stat -1 2 -1\n"
case "frontend":
cmdString = "show stat -1 1 -1\n"
case "server":
cmdString = "show stat -1 4 -1\n"
}
result, err := r.cmd(cmdString)
if err != nil {
return m, err
} else {
result, err := misc.CsvToMap(strings.Trim(removeStatsLines(result), "# "))
return result, err
}
}
// Executes a arbitrary HAproxy command on the unix socket
func (r *Runtime) cmd(cmd string) (string, error) {
// connect to haproxy
conn, err_conn := net.Dial("unix", r.SockFile)
defer conn.Close()
if err_conn != nil {
return "", errors.New("Unable to connect to Haproxy socket")
} else {
fmt.Fprint(conn, cmd)
response := ""
scanner := bufio.NewScanner(conn)
for scanner.Scan() {
response += (scanner.Text() + "\n")
}
if err := scanner.Err(); err != nil {
return "", err
} else {
return response, nil
}
}
}
func (r *Runtime) Reset() *Error {
if _, err := r.cmd("clear counters all" + "\n"); err != nil {
return &Error{500, errors.New("Error resetting counters")}
}
return nil
}
func removeStatsLines(in string) string {
rx := regexp.MustCompile("stats[,].*")
res := rx.ReplaceAllString(in, "")
return res
}