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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
17 lines
322 B
Go
17 lines
322 B
Go
package trace
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import (
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"testing"
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"github.com/stretchr/testify/assert"
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)
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func TestGetCallerOrPanic(t *testing.T) {
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withStackFromCtxMock := func() string {
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return getMyCallerOrPanic()
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}
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ret := withStackFromCtxMock()
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// zrepl prefix is stripped
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assert.Equal(t, "daemon/logging/trace.TestGetCallerOrPanic", ret)
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}
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