Python Tracebacker¶
1.3-dev 新版功能.
通常，如果你想要获取你的app的实时回溯，那么你必须修改你的代码，为其添加一个hook或者入口，正如:doc:`TipsAndTricks`页面上描述的。
从1.3-dev开始，uWSGI包括了一个类似的技术，允许你通过一个UNIX socket获取实时回溯。
要启用这个回溯器，你需要添加选项``py-tracebacker=<socket>``,，其中，``<socket>``是已创建UNIX socket的_basename_。
如果你有4个uWSGI worker，并且添加了``py-tracebacker=/tmp/tbsocket``，那么将会创建名字从``/tmp/tbsocket1``到``/tmp/tbsocket4``的4个socket。
连接到其中任意一个都将会返回worker中运行的线程的当前回溯。你可以使用你最喜欢的应用或方法来连接到那些socket，但是uWSGI有一个供你使用的方便的选项``connect-and-read``：
uwsgi –connect-and-read /tmp/tbsocket1
一个例子¶
让我们写一个名为``slow.py``的蠢蠢的测试应用：
import time
def dormi():
time.sleep(60)
def dormi2():
dormi()
def dormi3():
dormi2()
def dormi4():
dormi3()
def dormi5():
dormi4()
def application(e, start_response):
start_response('200 OK', [('Content-Type', 'text/html')])
dormi5()
return "hello"
然后运行它:
uwsgi --http :8080 -w slow --master --processes 2 --threads 4 --py-tracebacker /tmp/tbsocket.
然后创建一堆到它的请求:
curl http://localhost:8080 &
curl http://localhost:8080 &
curl http://localhost:8080 &
curl http://localhost:8080 &
现在，当这些请求运行的时候 (每个都会花费几乎一分钟来完成)，你就可以检索回溯，比方说，前两个worker:
./uwsgi --connect-and-read /tmp/tbsocket.1
./uwsgi --connect-and-read /tmp/tbsocket.2
回溯器的输出将会是这样的:
*** uWSGI Python tracebacker output ***
thread_id = uWSGIWorker1Core1 filename = ./slow.py lineno = 22 function = application line = dormi5()
thread_id = uWSGIWorker1Core1 filename = ./slow.py lineno = 14 function = dormi5 line = def dormi5(): dormi4()
thread_id = uWSGIWorker1Core1 filename = ./slow.py lineno = 13 function = dormi4 line = def dormi4(): dormi3()
thread_id = uWSGIWorker1Core1 filename = ./slow.py lineno = 12 function = dormi3 line = def dormi3(): dormi2()
thread_id = uWSGIWorker1Core1 filename = ./slow.py lineno = 11 function = dormi2 line = def dormi2(): dormi()
thread_id = uWSGIWorker1Core1 filename = ./slow.py lineno = 9 function = dormi line = time.sleep(60)
thread_id = uWSGIWorker1Core3 filename = ./slow.py lineno = 22 function = application line = dormi5()
thread_id = uWSGIWorker1Core3 filename = ./slow.py lineno = 14 function = dormi5 line = def dormi5(): dormi4()
thread_id = uWSGIWorker1Core3 filename = ./slow.py lineno = 13 function = dormi4 line = def dormi4(): dormi3()
thread_id = uWSGIWorker1Core3 filename = ./slow.py lineno = 12 function = dormi3 line = def dormi3(): dormi2()
thread_id = uWSGIWorker1Core3 filename = ./slow.py lineno = 11 function = dormi2 line = def dormi2(): dormi()
thread_id = uWSGIWorker1Core3 filename = ./slow.py lineno = 9 function = dormi line = time.sleep(60)
thread_id = MainThread filename = ./slow.py lineno = 22 function = application line = dormi5()
thread_id = MainThread filename = ./slow.py lineno = 14 function = dormi5 line = def dormi5(): dormi4()
thread_id = MainThread filename = ./slow.py lineno = 13 function = dormi4 line = def dormi4(): dormi3()
thread_id = MainThread filename = ./slow.py lineno = 12 function = dormi3 line = def dormi3(): dormi2()
thread_id = MainThread filename = ./slow.py lineno = 11 function = dormi2 line = def dormi2(): dormi()
thread_id = MainThread filename = ./slow.py lineno = 9 function = dormi line = time.sleep(60)