View Source et_selector (et v1.7.1)
Define event transforms and trace patterns
Summary
Functions
change_pattern(Pattern) -> ok
make_pattern(RawPattern) -> TracePattern
parse_event(Mod, ValidTraceData) -> false | true | {true, Event}
Types
-type level() :: 0..100.
Functions
-spec change_pattern({Mod :: module(), Pattern}) -> ok when Pattern :: DetailLevel | TracePattern | EmptyTracePattern, DetailLevel :: level(), TracePattern :: [{[term()] | '_' | atom(), [term()], [term()]}], EmptyTracePattern :: [].
change_pattern(Pattern) -> ok
Activates/deactivates tracing by changing the current trace pattern.
min
detail level deactivates tracing of calls to et:trace_me/4,5
max
detail level activates tracing of all calls to et:trace_me/4,5
integer(X)
detail level activates tracing of all calls to et:trace_me/4,5
whose detail level argument is lesser than X
.
An empty match spec deactivates tracing of calls to et:trace_me/4,5
Other match specs activates tracing of calls to et:trace_me/4,5
accordingly
with erlang:trace_pattern/2
.
-spec make_pattern({Mod :: module(), RawPattern}) -> {Mod :: module(), TracePattern} when RawPattern :: level(), TracePattern :: [{[term()] | '_' | atom(), [term()], [term()]}].
make_pattern(RawPattern) -> TracePattern
Makes a trace pattern suitable to feed change_pattern/1
Min detail level deactivates tracing of calls to et:trace_me/4,5
Max detail level activates tracing of all calls to et:trace_me/4,5
integer(X) detail level activates tracing of all calls to et:trace_me/4,5
whose detail level argument is lesser than X.
See also erlang:trace_pattern/2
for more info about its match_spec()
-spec parse_event(Mod, ValidTraceData) -> boolean | {true, event()} when Mod :: module(), ValidTraceData :: ErlangTraceData | event(), ErlangTraceData :: {trace, pid(), atom(), term()} | {trace, pid(), atom(), term(), term()} | {trace_ts, pid(), atom(), term(), TS :: {integer(), integer(), integer()}} | {trace_ts, pid(), atom(), term(), term(), TS :: {integer(), integer(), integer()}} | {seq_trace, atom(), term()} | {seq_trace, atom(), term(), TS :: {integer(), integer(), integer()}} | {drop, integer()}.
parse_event(Mod, ValidTraceData) -> false | true | {true, Event}
Transforms trace data and makes an event record out of it.
See erlang:trace/3
for more info about the semantics of the trace data.
An event record consists of the following fields:
detail_level - Noise has a high level as opposed to essentials.
trace_ts - Time when the trace was generated. Same as event_ts if omitted in trace data.
event_ts - Time when the event record was created.
from - From actor, such as sender of a message.
to - To actor, such as receiver of message.
label - Label intended to provide a brief event summary.
contents - All nitty gritty details of the event.
See et:trace_me/4
and et:trace_me/5
for details.
Returns:
{true, Event} - where Event is an #event{} record representing the trace data
true - means that the trace data already is an event record and that it is valid as it is. No transformation is needed.
false - means that the trace data is uninteresting and should be dropped