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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
76 lines
1.9 KiB
Go
76 lines
1.9 KiB
Go
package client
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import (
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"context"
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"fmt"
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"os"
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"github.com/spf13/pflag"
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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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"github.com/zrepl/zrepl/version"
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)
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var versionArgs struct {
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Show string
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Config *config.Config
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ConfigErr error
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}
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var VersionCmd = &cli.Subcommand{
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Use: "version",
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Short: "print version of zrepl binary and running daemon",
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NoRequireConfig: true,
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SetupFlags: func(f *pflag.FlagSet) {
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f.StringVar(&versionArgs.Show, "show", "", "version info to show (client|daemon)")
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},
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Run: func(ctx context.Context, subcommand *cli.Subcommand, args []string) error {
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versionArgs.Config = subcommand.Config()
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versionArgs.ConfigErr = subcommand.ConfigParsingError()
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return runVersionCmd()
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},
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}
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func runVersionCmd() error {
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args := versionArgs
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if args.Show != "daemon" && args.Show != "client" && args.Show != "" {
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return fmt.Errorf("show flag must be 'client' or 'server' or be left empty")
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}
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var clientVersion, daemonVersion *version.ZreplVersionInformation
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if args.Show == "client" || args.Show == "" {
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clientVersion = version.NewZreplVersionInformation()
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fmt.Printf("client: %s\n", clientVersion.String())
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}
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if args.Show == "daemon" || args.Show == "" {
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if args.ConfigErr != nil {
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return fmt.Errorf("config parsing error: %s", args.ConfigErr)
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}
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httpc, err := controlHttpClient(args.Config.Global.Control.SockPath)
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if err != nil {
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return fmt.Errorf("server: error: %s\n", err)
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}
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var info version.ZreplVersionInformation
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err = jsonRequestResponse(httpc, daemon.ControlJobEndpointVersion, "", &info)
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if err != nil {
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return fmt.Errorf("server: error: %s\n", err)
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}
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daemonVersion = &info
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fmt.Printf("server: %s\n", daemonVersion.String())
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}
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if args.Show == "" {
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if clientVersion.Version != daemonVersion.Version {
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fmt.Fprintf(os.Stderr, "WARNING: client version != daemon version, restart zrepl daemon\n")
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}
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}
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return nil
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}
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