mirror of
https://github.com/zrepl/zrepl.git
synced 2024-11-30 20:35:23 +01:00
10a14a8c50
package trace:
- introduce the concept of tasks and spans, tracked as linked list within ctx
- see package-level docs for an overview of the concepts
- **main feature 1**: unique stack of task and span IDs
- makes it easy to follow a series of log entries in concurrent code
- **main feature 2**: ability to produce a chrome://tracing-compatible trace file
- either via an env variable or a `zrepl pprof` subcommand
- this is not a CPU profile, we already have go pprof for that
- but it is very useful to visually inspect where the
replication / snapshotter / pruner spends its time
( fixes #307 )
usage in package daemon/logging:
- goal: every log entry should have a trace field with the ID stack from package trace
- make `logging.GetLogger(ctx, Subsys)` the authoritative `logger.Logger` factory function
- the context carries a linked list of injected fields which
`logging.GetLogger` adds to the logger it returns
- `logging.GetLogger` also uses package `trace` to get the
task-and-span-stack and injects it into the returned logger's fields
69 lines
1.5 KiB
Go
69 lines
1.5 KiB
Go
package client
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"log"
|
|
"os"
|
|
|
|
"github.com/zrepl/zrepl/cli"
|
|
"github.com/zrepl/zrepl/config"
|
|
"github.com/zrepl/zrepl/daemon"
|
|
)
|
|
|
|
var pprofListenCmd struct {
|
|
daemon.PprofServerControlMsg
|
|
}
|
|
|
|
var PprofListenCmd = &cli.Subcommand{
|
|
Use: "listen off | [on TCP_LISTEN_ADDRESS]",
|
|
Short: "start a http server exposing go-tool-compatible profiling endpoints at TCP_LISTEN_ADDRESS",
|
|
Run: func(ctx context.Context, subcommand *cli.Subcommand, args []string) error {
|
|
if len(args) < 1 {
|
|
goto enargs
|
|
}
|
|
switch args[0] {
|
|
case "on":
|
|
pprofListenCmd.Run = true
|
|
if len(args) != 2 {
|
|
return errors.New("must specify TCP_LISTEN_ADDRESS as second positional argument")
|
|
}
|
|
pprofListenCmd.HttpListenAddress = args[1]
|
|
case "off":
|
|
if len(args) != 1 {
|
|
goto enargs
|
|
}
|
|
pprofListenCmd.Run = false
|
|
}
|
|
|
|
RunPProf(subcommand.Config())
|
|
return nil
|
|
enargs:
|
|
return errors.New("invalid number of positional arguments")
|
|
|
|
},
|
|
}
|
|
|
|
func RunPProf(conf *config.Config) {
|
|
log := log.New(os.Stderr, "", 0)
|
|
|
|
die := func() {
|
|
log.Printf("exiting after error")
|
|
os.Exit(1)
|
|
}
|
|
|
|
log.Printf("connecting to zrepl daemon")
|
|
|
|
httpc, err := controlHttpClient(conf.Global.Control.SockPath)
|
|
if err != nil {
|
|
log.Printf("error creating http client: %s", err)
|
|
die()
|
|
}
|
|
err = jsonRequestResponse(httpc, daemon.ControlJobEndpointPProf, pprofListenCmd.PprofServerControlMsg, struct{}{})
|
|
if err != nil {
|
|
log.Printf("error sending control message: %s", err)
|
|
die()
|
|
}
|
|
log.Printf("finished")
|
|
}
|