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https://github.com/zrepl/zrepl.git
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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
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import (
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"context"
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"errors"
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"log"
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"os"
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"github.com/zrepl/zrepl/cli"
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"github.com/zrepl/zrepl/config"
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"github.com/zrepl/zrepl/daemon"
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)
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var pprofListenCmd struct {
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daemon.PprofServerControlMsg
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}
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var PprofListenCmd = &cli.Subcommand{
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Use: "listen off | [on TCP_LISTEN_ADDRESS]",
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Short: "start a http server exposing go-tool-compatible profiling endpoints at TCP_LISTEN_ADDRESS",
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Run: func(ctx context.Context, subcommand *cli.Subcommand, args []string) error {
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if len(args) < 1 {
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goto enargs
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}
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switch args[0] {
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case "on":
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pprofListenCmd.Run = true
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if len(args) != 2 {
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return errors.New("must specify TCP_LISTEN_ADDRESS as second positional argument")
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}
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pprofListenCmd.HttpListenAddress = args[1]
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case "off":
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if len(args) != 1 {
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goto enargs
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}
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pprofListenCmd.Run = false
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}
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RunPProf(subcommand.Config())
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return nil
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enargs:
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return errors.New("invalid number of positional arguments")
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},
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}
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func RunPProf(conf *config.Config) {
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log := log.New(os.Stderr, "", 0)
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die := func() {
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log.Printf("exiting after error")
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os.Exit(1)
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}
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log.Printf("connecting to zrepl daemon")
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httpc, err := controlHttpClient(conf.Global.Control.SockPath)
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if err != nil {
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log.Printf("error creating http client: %s", err)
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die()
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}
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err = jsonRequestResponse(httpc, daemon.ControlJobEndpointPProf, pprofListenCmd.PprofServerControlMsg, struct{}{})
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if err != nil {
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log.Printf("error sending control message: %s", err)
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die()
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}
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log.Printf("finished")
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}
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