tree 4d8ecd45a77de7bd3072c01250fa1c5259cadbd9
parent 5f912351e5b39dfbbbe166fbc9a291f72d1a5ce5
author Erwin Jansen <jansene@google.com> 1557985318 -0700
committer Erwin Jansen <jansene@google.com> 1558473271 -0700

[gRPC] Add support for logcat

The gRPC endpoint now supports streaming and pulling logcat data.
The api is similar to the GCE get serialOutput api.

Contains a python example that demonstrates streaming logcat, and
a JavaScript example pulling logcat data.

The addition of this endpoint caused some small changes in how we handle
the LogcatPipe:

- We always enable the logcat pipe. This fixes some weirdness around
logcat and snapshots (See b/132840817 for details).
- We add a RingStreambuf class which acts as a sliding window over an
  i/o stream.
- Add some unit tests to validate the Ringbuffer.
- Adds a benchmark to validate performance improvements.

Change-Id: I0b3199ffbbdfbc506fb0b003e87fd60646251cec
Bug: b/132840817