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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
52 lines
1.3 KiB
Go
52 lines
1.3 KiB
Go
package client
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import (
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"os"
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"github.com/problame/go-netssh"
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"github.com/zrepl/zrepl/cli"
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"github.com/zrepl/zrepl/config"
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"context"
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"errors"
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"log"
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"path"
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)
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var StdinserverCmd = &cli.Subcommand{
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Use: "stdinserver CLIENT_IDENTITY",
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Short: "stdinserver transport mode (started from authorized_keys file as forced command)",
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Run: func(ctx context.Context, subcommand *cli.Subcommand, args []string) error {
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return runStdinserver(subcommand.Config(), args)
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},
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}
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func runStdinserver(config *config.Config, args []string) error {
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// NOTE: the netssh proxying protocol requires exiting with non-zero status if anything goes wrong
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defer os.Exit(1)
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log := log.New(os.Stderr, "", log.LUTC|log.Ldate|log.Ltime)
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if len(args) != 1 || args[0] == "" {
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err := errors.New("must specify client_identity as positional argument")
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return err
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}
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identity := args[0]
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unixaddr := path.Join(config.Global.Serve.StdinServer.SockDir, identity)
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log.Printf("proxying client identity '%s' to zrepl daemon '%s'", identity, unixaddr)
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ctx := netssh.ContextWithLog(context.TODO(), log)
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err := netssh.Proxy(ctx, unixaddr)
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if err == nil {
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log.Print("proxying finished successfully, exiting with status 0")
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os.Exit(0)
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}
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log.Printf("error proxying: %s", err)
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return nil
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}
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