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command.go
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command.go
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package console
import (
"fmt"
"github.com/name5566/leaf/chanrpc"
"github.com/name5566/leaf/conf"
"github.com/name5566/leaf/log"
"os"
"path"
"runtime/pprof"
"time"
)
var commands = []Command{
new(CommandHelp),
new(CommandCPUProf),
new(CommandProf),
}
type Command interface {
// must goroutine safe
name() string
// must goroutine safe
help() string
// must goroutine safe
run(args []string) string
}
type ExternalCommand struct {
_name string
_help string
server *chanrpc.Server
}
func (c *ExternalCommand) name() string {
return c._name
}
func (c *ExternalCommand) help() string {
return c._help
}
func (c *ExternalCommand) run(_args []string) string {
args := make([]interface{}, len(_args))
for i, v := range _args {
args[i] = v
}
ret, err := c.server.Call1(c._name, args...)
if err != nil {
return err.Error()
}
output, ok := ret.(string)
if !ok {
return "invalid output type"
}
return output
}
// you must call the function before calling console.Init
// goroutine not safe
func Register(name string, help string, f interface{}, server *chanrpc.Server) {
for _, c := range commands {
if c.name() == name {
log.Fatal("command %v is already registered", name)
}
}
server.Register(name, f)
c := new(ExternalCommand)
c._name = name
c._help = help
c.server = server
commands = append(commands, c)
}
// help
type CommandHelp struct{}
func (c *CommandHelp) name() string {
return "help"
}
func (c *CommandHelp) help() string {
return "this help text"
}
func (c *CommandHelp) run([]string) string {
output := "Commands:\r\n"
for _, c := range commands {
output += c.name() + " - " + c.help() + "\r\n"
}
output += "quit - exit console"
return output
}
// cpuprof
type CommandCPUProf struct{}
func (c *CommandCPUProf) name() string {
return "cpuprof"
}
func (c *CommandCPUProf) help() string {
return "CPU profiling for the current process"
}
func (c *CommandCPUProf) usage() string {
return "cpuprof writes runtime profiling data in the format expected by \r\n" +
"the pprof visualization tool\r\n\r\n" +
"Usage: cpuprof start|stop\r\n" +
" start - enables CPU profiling\r\n" +
" stop - stops the current CPU profile"
}
func (c *CommandCPUProf) run(args []string) string {
if len(args) == 0 {
return c.usage()
}
switch args[0] {
case "start":
fn := profileName() + ".cpuprof"
f, err := os.Create(fn)
if err != nil {
return err.Error()
}
err = pprof.StartCPUProfile(f)
if err != nil {
f.Close()
return err.Error()
}
return fn
case "stop":
pprof.StopCPUProfile()
return ""
default:
return c.usage()
}
}
func profileName() string {
now := time.Now()
return path.Join(conf.ProfilePath,
fmt.Sprintf("%d%02d%02d_%02d_%02d_%02d",
now.Year(),
now.Month(),
now.Day(),
now.Hour(),
now.Minute(),
now.Second()))
}
// prof
type CommandProf struct{}
func (c *CommandProf) name() string {
return "prof"
}
func (c *CommandProf) help() string {
return "writes a pprof-formatted snapshot"
}
func (c *CommandProf) usage() string {
return "prof writes runtime profiling data in the format expected by \r\n" +
"the pprof visualization tool\r\n\r\n" +
"Usage: prof goroutine|heap|thread|block\r\n" +
" goroutine - stack traces of all current goroutines\r\n" +
" heap - a sampling of all heap allocations\r\n" +
" thread - stack traces that led to the creation of new OS threads\r\n" +
" block - stack traces that led to blocking on synchronization primitives"
}
func (c *CommandProf) run(args []string) string {
if len(args) == 0 {
return c.usage()
}
var (
p *pprof.Profile
fn string
)
switch args[0] {
case "goroutine":
p = pprof.Lookup("goroutine")
fn = profileName() + ".gprof"
case "heap":
p = pprof.Lookup("heap")
fn = profileName() + ".hprof"
case "thread":
p = pprof.Lookup("threadcreate")
fn = profileName() + ".tprof"
case "block":
p = pprof.Lookup("block")
fn = profileName() + ".bprof"
default:
return c.usage()
}
f, err := os.Create(fn)
if err != nil {
return err.Error()
}
defer f.Close()
err = p.WriteTo(f, 0)
if err != nil {
return err.Error()
}
return fn
}