Scrapy comes with a built-in telnet console for inspecting and controlling a Scrapy running process. The telnet console is just a regular python shell running inside the Scrapy process, so you can do literally anything from it.
The telnet console is a built-in Scrapy extension which comes enabled by default, but you can also disable it if you want. For more information about the extension itself see Telnet console extension.
The telnet console listens in the TCP port defined in the TELNETCONSOLE_PORT setting, which defaults to 6023. To access the console you need to type:
telnet localhost 6023
>>>
You need the telnet program which comes installed by default in Windows, and most Linux distros.
The telnet console is like a regular Python shell running inside the Scrapy process, so you can do anything from it including importing new modules, etc.
However, the telnet console comes with some default variables defined for convenience:
Shortcut | Description |
---|---|
crawler | the Scrapy Crawler object (scrapy.crawler) |
engine | the Scrapy Engine object (scrapy.core.engine) |
spider | the spider object (only if there is a single spider opened) |
slot | the engine slot (only if there is a single spider opened) |
extensions | the Extension Manager (scrapy.project.crawler.extensions) |
stats | the Stats Collector (scrapy.stats.stats) |
settings | the Scrapy settings object (scrapy.conf.settings) |
est | print a report of the current engine status |
prefs | for memory debugging (see Debugging memory leaks) |
p | a shortcut to the pprint.pprint function |
hpy | for memory debugging (see Debugging memory leaks) |
Here are some example tasks you can do with the telnet console:
You can use the est() method of the Scrapy engine to quickly show its state using the telnet console:
telnet localhost 6023
>>> est()
Execution engine status
time()-engine.start_time : 21.3188259602
engine.is_idle() : False
engine.has_capacity() : True
engine.scheduler.is_idle() : False
len(engine.scheduler.pending_requests) : 1
engine.downloader.is_idle() : False
len(engine.downloader.slots) : 1
engine.scraper.is_idle() : False
len(engine.scraper.slots) : 1
Spider: <GayotSpider 'gayotcom' at 0x2dc2b10>
engine.spider_is_idle(spider) : False
engine.slots[spider].closing : False
len(engine.scheduler.pending_requests[spider]) : 11504
len(engine.downloader.slots[spider].queue) : 9
len(engine.downloader.slots[spider].active) : 17
len(engine.downloader.slots[spider].transferring) : 8
engine.downloader.slots[spider].lastseen : 1311311093.61
len(engine.scraper.slots[spider].queue) : 0
len(engine.scraper.slots[spider].active) : 0
engine.scraper.slots[spider].active_size : 0
engine.scraper.slots[spider].itemproc_size : 0
engine.scraper.slots[spider].needs_backout() : False
To pause:
telnet localhost 6023
>>> engine.pause()
>>>
To resume:
telnet localhost 6023
>>> engine.unpause()
>>>
To stop:
telnet localhost 6023
>>> engine.stop()
Connection closed by foreign host.
Sent just before the telnet console is opened. You can hook up to this signal to add, remove or update the variables that will be available in the telnet local namespace. In order to do that, you need to update the telnet_vars dict in your handler.
Parameters: | telnet_vars (dict) – the dict of telnet variables |
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