Bottle 框架源码学习 二
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上一篇简单分析了route的基本用法
本篇分析一下run函数的运行原理
def run(app=None, server=‘wsgiref‘, host=‘127.0.0.1‘, port=8080, interval=1, reloader=False, quiet=False, plugins=None, debug=None, **kargs): if NORUN: return if reloader and not os.environ.get(‘BOTTLE_CHILD‘): try: lockfile = None fd, lockfile = tempfile.mkstemp(prefix=‘bottle.‘, suffix=‘.lock‘) os.close(fd) # We only need this file to exist. We never write to it while os.path.exists(lockfile): args = [sys.executable] + sys.argv environ = os.environ.copy() environ[‘BOTTLE_CHILD‘] = ‘true‘ environ[‘BOTTLE_LOCKFILE‘] = lockfile p = subprocess.Popen(args, env=environ) while p.poll() is None: # Busy wait... os.utime(lockfile, None) # I am alive! time.sleep(interval) if p.poll() != 3: if os.path.exists(lockfile): os.unlink(lockfile) sys.exit(p.poll()) except KeyboardInterrupt: pass finally: if os.path.exists(lockfile): os.unlink(lockfile) return try: if debug is not None: _debug(debug) app = app or default_app() if isinstance(app, basestring): app = load_app(app) if not callable(app): raise ValueError("Application is not callable: %r" % app) for plugin in plugins or []: app.install(plugin) if server in server_names: server = server_names.get(server) if isinstance(server, basestring): server = load(server) if isinstance(server, type): server = server(host=host, port=port, **kargs) if not isinstance(server, ServerAdapter): raise ValueError("Unknown or unsupported server: %r" % server) server.quiet = server.quiet or quiet if not server.quiet: _stderr("Bottle v%s server starting up (using %s)...\n" % (__version__, repr(server))) _stderr("Listening on http://%s:%d/\n" % (server.host, server.port)) _stderr("Hit Ctrl-C to quit.\n\n") if reloader: lockfile = os.environ.get(‘BOTTLE_LOCKFILE‘) bgcheck = FileCheckerThread(lockfile, interval) with bgcheck: server.run(app) if bgcheck.status == ‘reload‘: sys.exit(3) else: server.run(app) except KeyboardInterrupt: pass except (SystemExit, MemoryError): raise except: if not reloader: raise if not getattr(server, ‘quiet‘, quiet): print_exc() time.sleep(interval) sys.exit(3)
1.
if reloader and not os.environ.get(‘BOTTLE_CHILD‘):
这段代码作用是判断用户编辑了源码后,是否需要重新载入并运行bottle,先知道它的作用,具体细节暂时不看
2.看这一段
app = app or default_app() if isinstance(app, basestring): app = load_app(app) if not callable(app): raise ValueError("Application is not callable: %r" % app)
如果不显式指定一个application对象,bottle会帮我们生成一个默认的application对象
如果提供的app是一个字符串,则会通过load_app返回一个application对象
3.
if server in server_names: server = server_names.get(server) if isinstance(server, basestring): server = load(server) if isinstance(server, type): server = server(host=host, port=port, **kargs) if not isinstance(server, ServerAdapter): raise ValueError("Unknown or unsupported server: %r" % server) server.quiet = server.quiet or quiet if not server.quiet: _stderr("Bottle v%s server starting up (using %s)...\n" % (__version__, repr(server))) _stderr("Listening on http://%s:%d/\n" % (server.host, server.port)) _stderr("Hit Ctrl-C to quit.\n\n") if reloader: lockfile = os.environ.get(‘BOTTLE_LOCKFILE‘) bgcheck = FileCheckerThread(lockfile, interval) with bgcheck: server.run(app) if bgcheck.status == ‘reload‘: sys.exit(3) else: server.run(app)
如果不指定server(即实现wsgi协议的服务器程序),则会应用WSGIRefServer这个服务器程序
4.
server_names = { ‘cgi‘: CGIServer, ‘flup‘: FlupFCGIServer, ‘wsgiref‘: WSGIRefServer, ‘waitress‘: WaitressServer, ‘cherrypy‘: CherryPyServer, ‘paste‘: PasteServer, ‘fapws3‘: FapwsServer, ‘tornado‘: TornadoServer, ‘gae‘: AppEngineServer, ‘twisted‘: TwistedServer, ‘diesel‘: DieselServer, ‘meinheld‘: MeinheldServer, ‘gunicorn‘: GunicornServer, ‘eventlet‘: EventletServer, ‘gevent‘: GeventServer, ‘geventSocketIO‘:GeventSocketioserver, ‘rocket‘: RocketServer, ‘bjoern‘ : BjoernServer, ‘auto‘: AutoServer, }
以上是bottle支持的servers
本文出自 “nickylans” 博客,请务必保留此出处http://378359.blog.51cto.com/368359/1959384
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