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gaia/tests/jsmarionette/plugins/marionette-js-logger/index.js

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+'use strict';
+var LogGrabber = require('./lib/log_grabber').LogGrabber;
+
+/**
+ * How many log entries should be buffered in the device for our retrieval?  The
+ * obvious trade-off here is between memory and losing log entries.  And the
+ * underlying variables are rate of log generation and how often we poll for new
+ * logs.
+ */
+var DEFAULT_LOG_LIMIT = 10000;
+
+function setup(client, options) {
+  if (!options) {
+    options = {};
+  }
+
+  var grabber = new LogGrabber(client, options.logLimit || DEFAULT_LOG_LIMIT);
+
+  // Note!  marionette-js-runner's createHost method uses resetWithDriver every
+  // time it goes to instantiate us.  As a byproduct of this call, all hooks are
+  // reset, and this is why we don't need to worry about these addHook calls
+  // redundantly stacking up.
+  client.addHook('startSession', function(done) {
+    grabber._connect(done);
+  });
+
+  // deleteSession's hook runs after the session is already torn down, so we
+  // can't actually do anything at this point.
+
+  return grabber;
+}
+
+exports.setup = setup;