Elektra  0.9.2
Plugin: tracer
  • infos = Information about the tracer plugin is in keys below
  • infos/author = Markus Raab elekt.nosp@m.ra@l.nosp@m.ibele.nosp@m.ktra.nosp@m..org
  • infos/licence = BSD
  • infos/provides = tracing
  • infos/needs =
  • infos/placements = pregetstorage procgetstorage postgetstorage presetstorage precommit postcommit prerollback postrollback
  • infos/status = maintained tested nodep configurable global
  • infos/description = Traces the execution path of a backend

Introduction

This plugin is added on every possible position within a backend. It allows you to trace when the backend is executed.

Usage

If you want to trace how and if the backend is called:

kdb mount file.ysp user/trace_point your_storage_plugin tracer

So now we can trace whats below your trace point.

kdb ls user/trace_point

Ok, no tracer is called because resolver immediately told that there is no file.

kdb get user/trace_point
#> Did not find key

Ok, same conclusion.

kdb set user/trace_point hello
#> create a new key user/trace_point with string "hello"
#> tracer: set(0xd34cc0, user/trace_point): user/trace_point 1
#> tracer: set(0xd34cc0, user/trace_point): user/trace_point 1
#> tracer: set(0xd34cc0, user/trace_point): user/trace_point 1

Now the 3 placements in set are called.

kdb get user/trace_point
#> tracer: get(0x22e1cc0, user/trace_point): 0
#> tracer: get(0x22e1cc0, user/trace_point): 0
#> hello

Now the 2 placements in get are called.

Module Loading

Will not log when loaded as module (config /module present), unless /logmodule is set:

kdb plugin-check -c "logmodule=" tracer