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zrepl/daemon/hooks
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Christian Schwarz 10a14a8c50 [#307] add package trace, integrate it with logging, and adopt it throughout zrepl 
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
2020-05-19 11:30:02 +02:00
..
test pre- and post-snapshot hooks 2019-09-27 21:25:59 +02:00
edge_string.go pre- and post-snapshot hooks 2019-09-27 21:25:59 +02:00
hook_config.go pre- and post-snapshot hooks 2019-09-27 21:25:59 +02:00
hook_docs.go pre- and post-snapshot hooks 2019-09-27 21:25:59 +02:00
hook_exec.go snapper + client/status: snapshotting reports 2019-09-27 21:31:00 +02:00
hook_logging.go [#307] add package trace, integrate it with logging, and adopt it throughout zrepl 2020-05-19 11:30:02 +02:00
hook_type_callback.go pre- and post-snapshot hooks 2019-09-27 21:25:59 +02:00
hook_type_command.go pre- and post-snapshot hooks 2019-09-27 21:25:59 +02:00
hook_type_mysql_lock_tables.go pre- and post-snapshot hooks 2019-09-27 21:25:59 +02:00
hook_type_postgres_checkpoint.go pre- and post-snapshot hooks 2019-09-27 21:25:59 +02:00
hooks_test.go [#307] add package trace, integrate it with logging, and adopt it throughout zrepl 2020-05-19 11:30:02 +02:00
stepstatus_enumer.go pre- and post-snapshot hooks 2019-09-27 21:25:59 +02:00