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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
33 lines
594 B
Go
33 lines
594 B
Go
package zfscmd
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import (
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"context"
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"github.com/zrepl/zrepl/daemon/logging"
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"github.com/zrepl/zrepl/logger"
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)
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type contextKey int
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const (
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contextKeyJobID contextKey = 1 + iota
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)
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type Logger = logger.Logger
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func WithJobID(ctx context.Context, jobID string) context.Context {
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return context.WithValue(ctx, contextKeyJobID, jobID)
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}
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func getJobIDOrDefault(ctx context.Context, def string) string {
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ret, ok := ctx.Value(contextKeyJobID).(string)
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if !ok {
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return def
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}
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return ret
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}
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func getLogger(ctx context.Context) Logger {
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return logging.GetLogger(ctx, logging.SubsysZFSCmd)
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}
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