From fd383fd5f5bac0a4cebbacf7e1ffccfd0be04e50 Mon Sep 17 00:00:00 2001
From: Lars-Dominik Braun <lars@6xq.net>
Date: Tue, 21 Aug 2018 13:46:08 +0200
Subject: Log extracted links

---
 crocoite/cli.py        |  4 ++--
 crocoite/controller.py | 23 +++++++++++++++++++++++
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/crocoite/cli.py b/crocoite/cli.py
index ac7e648..73ddca1 100644
--- a/crocoite/cli.py
+++ b/crocoite/cli.py
@@ -26,7 +26,7 @@ import argparse, json, sys
 
 from . import behavior
 from .controller import SinglePageController, defaultSettings, \
-        ControllerSettings, StatsHandler
+        ControllerSettings, StatsHandler, LogHandler
 from .browser import NullService, ChromeService
 from .warc import WarcHandler
 from .logger import Logger, JsonPrintConsumer, DatetimeConsumer, WarcHandlerConsumer
@@ -55,7 +55,7 @@ def single ():
             idleTimeout=args.idleTimeout, timeout=args.timeout)
     with open (args.output, 'wb') as fd, WarcHandler (fd, logger) as warcHandler:
         logger.connect (WarcHandlerConsumer (warcHandler))
-        handler = [StatsHandler (), warcHandler]
+        handler = [StatsHandler (), LogHandler (logger), warcHandler]
         b = list (map (lambda x: behavior.availableMap[x], args.enabledBehaviorNames))
         controller = SinglePageController (args.url, fd, settings=settings,
                 service=service, handler=handler, behavior=b, logger=logger)
diff --git a/crocoite/controller.py b/crocoite/controller.py
index 9dae96f..01edc44 100644
--- a/crocoite/controller.py
+++ b/crocoite/controller.py
@@ -69,6 +69,29 @@ class StatsHandler (EventHandler):
         elif isinstance (item, BrowserCrashed):
             self.stats['crashed'] += 1
 
+from .behavior import ExtractLinksEvent
+from itertools import islice
+
+class LogHandler (EventHandler):
+    """ Handle items by logging information about them """
+
+    __slots__ = ('logger')
+
+    def __init__ (self, logger):
+        self.logger = logger.bind (context=type (self).__name__)
+
+    def push (self, item):
+        if isinstance (item, ExtractLinksEvent):
+            # limit number of links per message, so json blob won’t get too big
+            it = iter (item.links)
+            limit = 100
+            while True:
+                limitlinks = list (islice (it, 0, limit))
+                if not limitlinks:
+                    break
+                self.logger.info ('extracted links', context=type (item).__name__,
+                        uuid='8ee5e9c9-1130-4c5c-88ff-718508546e0c', links=limitlinks)
+
 import time, platform
 
 from . import behavior as cbehavior
-- 
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