mirror of
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
59 lines
1.4 KiB
Go
59 lines
1.4 KiB
Go
package client
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import (
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"context"
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"fmt"
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"github.com/pkg/errors"
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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/endpoint"
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"github.com/zrepl/zrepl/zfs"
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)
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var zabsCreateStepHoldFlags struct {
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target string
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jobid JobIDFlag
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}
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var zabsCmdCreateStepHold = &cli.Subcommand{
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Use: "step",
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Run: doZabsCreateStep,
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NoRequireConfig: true,
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Short: `create a step hold or bookmark`,
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SetupFlags: func(f *pflag.FlagSet) {
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f.StringVarP(&zabsCreateStepHoldFlags.target, "target", "t", "", "snapshot to be held / bookmark to be held")
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f.VarP(&zabsCreateStepHoldFlags.jobid, "jobid", "j", "jobid for which the hold is installed")
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},
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}
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func doZabsCreateStep(ctx context.Context, sc *cli.Subcommand, args []string) error {
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if len(args) > 0 {
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return errors.New("subcommand takes no arguments")
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}
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f := &zabsCreateStepHoldFlags
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fs, _, _, err := zfs.DecomposeVersionString(f.target)
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if err != nil {
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return errors.Wrapf(err, "%q invalid target", f.target)
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}
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if f.jobid.FlagValue() == nil {
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return errors.Errorf("jobid must be set")
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}
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v, err := zfs.ZFSGetFilesystemVersion(ctx, f.target)
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if err != nil {
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return errors.Wrapf(err, "get info about target %q", f.target)
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}
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step, err := endpoint.HoldStep(ctx, fs, v, *f.jobid.FlagValue())
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if err != nil {
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return errors.Wrap(err, "create step hold")
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}
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fmt.Println(step.String())
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return nil
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}
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