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[WIP] add and use tracing API as part of package logging

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- 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
- introduce the concept of tasks and spans, also tracked as linked list within ctx
    - [ ] TODO automatic logging of span begins and ends, with a unique
      ID stack that makes it easy to follow a series of log entries in
      concurrent code
    - 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 )
This commit is contained in:
Christian Schwarz
2020-04-11 15:49:41 +02:00
parent 3d91686350
commit 1ae087bfcf
68 changed files with 1441 additions and 441 deletions
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go.mod
+2
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@@ -23,10 +23,12 @@ require (
github.com/pkg/profile v1.2.1
github.com/problame/go-netssh v0.0.0-20191209123953-18d8aa6923c7
github.com/prometheus/client_golang v1.2.1
github.com/prometheus/common v0.7.0
github.com/sergi/go-diff v1.0.1-0.20180205163309-da645544ed44 // go1.12 thinks it needs this
github.com/spf13/cobra v0.0.2
github.com/spf13/pflag v1.0.5
github.com/stretchr/testify v1.4.0
github.com/willf/bitset v1.1.10
github.com/yudai/gojsondiff v0.0.0-20170107030110-7b1b7adf999d
github.com/yudai/golcs v0.0.0-20170316035057-ecda9a501e82 // go1.12 thinks it needs this
github.com/zrepl/yaml-config v0.0.0-20191220194647-cbb6b0cf4bdd