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tracer/README: update docs

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Update status of what is done and what we want to figure still.
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Stefan Sauer 2016-12-20 10:26:55 +01:00
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# Add a python api for tracer analyzers
The python framework will parse the tracer log and aggregate information.
the tool writer will subclass from the Analyzer class and override method like:
the tool writer will subclass from the Analyzer class and override methods:
'pad_push_buffer_pre'
'handle_tracer_class(self, entry)'
'handle_tracer_entry(self, entry)'
There is one method for each hook. Each of those methods will receive the parse
log line. In addition the framework will offer some extra api to allow to e.g.
write:
Each of those is optional. The entry field is the parsed log line. In most cases
the tools will parse the structure contained in event[Parser.F_MESSAGE].
A tool will use an AnalysisRunner to chain one or more analyzers and iterate the
log. A tool can also replay the log multiple times. If it does, it won't work in
'streaming' mode though (streaming mode can offer live stats).
## TODO
### gst shadow types
Do we want to provide classes like GstBin, GstElement, GstPad, ... to aggregate
info. One way to get them would be to have a GstLogAnalyzer that knows
about data from the log tracer and populates the classes. Tools then can
do e.g.
pad.name() # pad name
pad.parent().name() # element name
pad.peer().parent() # peer element
pad.parent().state() # element state
If we don't have full loging, we'd like to print a warning once, but make this
non fatal if possible. E.g. if we don't have logging for
element_{add,remove}_pad, we might not be able to provide pad.parent().
A tool can replay the log multiple times. If it does, it won't work in
'streaming' mode though. Streaming mode can offer live stats.
## TODO
Do we want to provide classes like GstBin, GstElement, GstPad, ... to aggregate
info. We'd need to also provide a way to e.g. add a GstLogAnalyzer that knows
about data from the log tracer and populates the classes. We need to be able to
build a pipeline of analyzers, e.g. the analyzer calls GstLogAnalzer in its
catch-all handler and then processes some events individually.
Parse the tracer classes. Add helper that for numeric values extract them, and
aggregate min/max/avg. Consider other statistical information (std. deviation)
and provide a rolling average for live view.
Think of how analyzer classes can be combined:
- we'd like to build tools that import other analyzer classes and chain the
processing.
### improve class handling
We already parse the tracer classes. Add helpers that for numeric values that
extract them, and aggregate min/max/avg. Consider other statistical information
(std. deviation) and provide a rolling average for live view.
## Examples
### Sequence chart generator (mscgen)