"""Extensions to unittest for web frameworks. Use the WebCase.getPage method to request a page from your HTTP server. Framework Integration ===================== If you have control over your server process, you can handle errors in the server-side of the HTTP conversation a bit better. You must run both the client (your WebCase tests) and the server in the same process (but in separate threads, obviously). When an error occurs in the framework, call server_error. It will print the traceback to stdout, and keep any assertions you have from running (the assumption is that, if the server errors, the page output will not be of further significance to your tests). """ import os import pprint import re import socket import sys import time import traceback import types from unittest import * from unittest import _TextTestResult from cherrypy._cpcompat import basestring, HTTPConnection, HTTPSConnection, unicodestr def interface(host): """Return an IP address for a client connection given the server host. If the server is listening on '0.0.0.0' (INADDR_ANY) or '::' (IN6ADDR_ANY), this will return the proper localhost.""" if host == '0.0.0.0': # INADDR_ANY, which should respond on localhost. return "127.0.0.1" if host == '::': # IN6ADDR_ANY, which should respond on localhost. return "::1" return host class TerseTestResult(_TextTestResult): def printErrors(self): # Overridden to avoid unnecessary empty line if self.errors or self.failures: if self.dots or self.showAll: self.stream.writeln() self.printErrorList('ERROR', self.errors) self.printErrorList('FAIL', self.failures) class TerseTestRunner(TextTestRunner): """A test runner class that displays results in textual form.""" def _makeResult(self): return TerseTestResult(self.stream, self.descriptions, self.verbosity) def run(self, test): "Run the given test case or test suite." # Overridden to remove unnecessary empty lines and separators result = self._makeResult() test(result) result.printErrors() if not result.wasSuccessful(): self.stream.write("FAILED (") failed, errored = list(map(len, (result.failures, result.errors))) if failed: self.stream.write("failures=%d" % failed) if errored: if failed: self.stream.write(", ") self.stream.write("errors=%d" % errored) self.stream.writeln(")") return result class ReloadingTestLoader(TestLoader): def loadTestsFromName(self, name, module=None): """Return a suite of all tests cases given a string specifier. The name may resolve either to a module, a test case class, a test method within a test case class, or a callable object which returns a TestCase or TestSuite instance. The method optionally resolves the names relative to a given module. """ parts = name.split('.') unused_parts = [] if module is None: if not parts: raise ValueError("incomplete test name: %s" % name) else: parts_copy = parts[:] while parts_copy: target = ".".join(parts_copy) if target in sys.modules: module = reload(sys.modules[target]) parts = unused_parts break else: try: module = __import__(target) parts = unused_parts break except ImportError: unused_parts.insert(0,parts_copy[-1]) del parts_copy[-1] if not parts_copy: raise parts = parts[1:] obj = module for part in parts: obj = getattr(obj, part) if type(obj) == types.ModuleType: return self.loadTestsFromModule(obj) elif (isinstance(obj, (type, types.ClassType)) and issubclass(obj, TestCase)): return self.loadTestsFromTestCase(obj) elif type(obj) == types.UnboundMethodType: return obj.im_class(obj.__name__) elif hasattr(obj, '__call__'): test = obj() if not isinstance(test, TestCase) and \ not isinstance(test, TestSuite): raise ValueError("calling %s returned %s, " "not a test" % (obj,test)) return test else: raise ValueError("do not know how to make test from: %s" % obj) try: # Jython support if sys.platform[:4] == 'java': def getchar(): # Hopefully this is enough return sys.stdin.read(1) else: # On Windows, msvcrt.getch reads a single char without output. import msvcrt def getchar(): return msvcrt.getch() except ImportError: # Unix getchr import tty, termios def getchar(): fd = sys.stdin.fileno() old_settings = termios.tcgetattr(fd) try: tty.setraw(sys.stdin.fileno()) ch = sys.stdin.read(1) finally: termios.tcsetattr(fd, termios.TCSADRAIN, old_settings) return ch class WebCase(TestCase): HOST = "127.0.0.1" PORT = 8000 HTTP_CONN = HTTPConnection PROTOCOL = "HTTP/1.1" scheme = "http" url = None status = None headers = None body = None encoding = 'utf-8' time = None def get_conn(self, auto_open=False): """Return a connection to our HTTP server.""" if self.scheme == "https": cls = HTTPSConnection else: cls = HTTPConnection conn = cls(self.interface(), self.PORT) # Automatically re-connect? conn.auto_open = auto_open conn.connect() return conn def set_persistent(self, on=True, auto_open=False): """Make our HTTP_CONN persistent (or not). If the 'on' argument is True (the default), then self.HTTP_CONN will be set to an instance of HTTPConnection (or HTTPS if self.scheme is "https"). This will then persist across requests. We only allow for a single open connection, so if you call this and we currently have an open connection, it will be closed. """ try: self.HTTP_CONN.close() except (TypeError, AttributeError): pass if on: self.HTTP_CONN = self.get_conn(auto_open=auto_open) else: if self.scheme == "https": self.HTTP_CONN = HTTPSConnection else: self.HTTP_CONN = HTTPConnection def _get_persistent(self): return hasattr(self.HTTP_CONN, "__class__") def _set_persistent(self, on): self.set_persistent(on) persistent = property(_get_persistent, _set_persistent) def interface(self): """Return an IP address for a client connection. If the server is listening on '0.0.0.0' (INADDR_ANY) or '::' (IN6ADDR_ANY), this will return the proper localhost.""" return interface(self.HOST) def getPage(self, url, headers=None, method="GET", body=None, protocol=None): """Open the url with debugging support. Return status, headers, body.""" ServerError.on = False if isinstance(url, unicodestr): url = url.encode('utf-8') if isinstance(body, unicodestr): body = body.encode('utf-8') self.url = url self.time = None start = time.time() result = openURL(url, headers, method, body, self.HOST, self.PORT, self.HTTP_CONN, protocol or self.PROTOCOL) self.time = time.time() - start self.status, self.headers, self.body = result # Build a list of request cookies from the previous response cookies. self.cookies = [('Cookie', v) for k, v in self.headers if k.lower() == 'set-cookie'] if ServerError.on: raise ServerError() return result interactive = True console_height = 30 def _handlewebError(self, msg): print("") print(" ERROR: %s" % msg) if not self.interactive: raise self.failureException(msg) p = " Show: [B]ody [H]eaders [S]tatus [U]RL; [I]gnore, [R]aise, or sys.e[X]it >> " sys.stdout.write(p) sys.stdout.flush() while True: i = getchar().upper() if i not in "BHSUIRX": continue print(i.upper()) # Also prints new line if i == "B": for x, line in enumerate(self.body.splitlines()): if (x + 1) % self.console_height == 0: # The \r and comma should make the next line overwrite sys.stdout.write("<-- More -->\r") m = getchar().lower() # Erase our "More" prompt sys.stdout.write(" \r") if m == "q": break print(line) elif i == "H": pprint.pprint(self.headers) elif i == "S": print(self.status) elif i == "U": print(self.url) elif i == "I": # return without raising the normal exception return elif i == "R": raise self.failureException(msg) elif i == "X": self.exit() sys.stdout.write(p) sys.stdout.flush() def exit(self): sys.exit() def assertStatus(self, status, msg=None): """Fail if self.status != status.""" if isinstance(status, basestring): if not self.status == status: if msg is None: msg = 'Status (%r) != %r' % (self.status, status) self._handlewebError(msg) elif isinstance(status, int): code = int(self.status[:3]) if code != status: if msg is None: msg = 'Status (%r) != %r' % (self.status, status) self._handlewebError(msg) else: # status is a tuple or list. match = False for s in status: if isinstance(s, basestring): if self.status == s: match = True break elif int(self.status[:3]) == s: match = True break if not match: if msg is None: msg = 'Status (%r) not in %r' % (self.status, status) self._handlewebError(msg) def assertHeader(self, key, value=None, msg=None): """Fail if (key, [value]) not in self.headers.""" lowkey = key.lower() for k, v in self.headers: if k.lower() == lowkey: if value is None or str(value) == v: return v if msg is None: if value is None: msg = '%r not in headers' % key else: msg = '%r:%r not in headers' % (key, value) self._handlewebError(msg) def assertHeaderItemValue(self, key, value, msg=None): """Fail if the header does not contain the specified value""" actual_value = self.assertHeader(key, msg=msg) header_values = map(str.strip, actual_value.split(',')) if value in header_values: return value if msg is None: msg = "%r not in %r" % (value, header_values) self._handlewebError(msg) def assertNoHeader(self, key, msg=None): """Fail if key in self.headers.""" lowkey = key.lower() matches = [k for k, v in self.headers if k.lower() == lowkey] if matches: if msg is None: msg = '%r in headers' % key self._handlewebError(msg) def assertBody(self, value, msg=None): """Fail if value != self.body.""" if value != self.body: if msg is None: msg = 'expected body:\n%r\n\nactual body:\n%r' % (value, self.body) self._handlewebError(msg) def assertInBody(self, value, msg=None): """Fail if value not in self.body.""" if value not in self.body: if msg is None: msg = '%r not in body: %s' % (value, self.body) self._handlewebError(msg) def assertNotInBody(self, value, msg=None): """Fail if value in self.body.""" if value in self.body: if msg is None: msg = '%r found in body' % value self._handlewebError(msg) def assertMatchesBody(self, pattern, msg=None, flags=0): """Fail if value (a regex pattern) is not in self.body.""" if re.search(pattern, self.body, flags) is None: if msg is None: msg = 'No match for %r in body' % pattern self._handlewebError(msg) methods_with_bodies = ("POST", "PUT") def cleanHeaders(headers, method, body, host, port): """Return request headers, with required headers added (if missing).""" if headers is None: headers = [] # Add the required Host request header if not present. # [This specifies the host:port of the server, not the client.] found = False for k, v in headers: if k.lower() == 'host': found = True break if not found: if port == 80: headers.append(("Host", host)) else: headers.append(("Host", "%s:%s" % (host, port))) if method in methods_with_bodies: # Stick in default type and length headers if not present found = False for k, v in headers: if k.lower() == 'content-type': found = True break if not found: headers.append(("Content-Type", "application/x-www-form-urlencoded")) headers.append(("Content-Length", str(len(body or "")))) return headers def shb(response): """Return status, headers, body the way we like from a response.""" h = [] key, value = None, None for line in response.msg.headers: if line: if line[0] in " \t": value += line.strip() else: if key and value: h.append((key, value)) key, value = line.split(":", 1) key = key.strip() value = value.strip() if key and value: h.append((key, value)) return "%s %s" % (response.status, response.reason), h, response.read() def openURL(url, headers=None, method="GET", body=None, host="127.0.0.1", port=8000, http_conn=HTTPConnection, protocol="HTTP/1.1"): """Open the given HTTP resource and return status, headers, and body.""" headers = cleanHeaders(headers, method, body, host, port) # Trying 10 times is simply in case of socket errors. # Normal case--it should run once. for trial in range(10): try: # Allow http_conn to be a class or an instance if hasattr(http_conn, "host"): conn = http_conn else: conn = http_conn(interface(host), port) conn._http_vsn_str = protocol conn._http_vsn = int("".join([x for x in protocol if x.isdigit()])) # skip_accept_encoding argument added in python version 2.4 if sys.version_info < (2, 4): def putheader(self, header, value): if header == 'Accept-Encoding' and value == 'identity': return self.__class__.putheader(self, header, value) import new conn.putheader = new.instancemethod(putheader, conn, conn.__class__) conn.putrequest(method.upper(), url, skip_host=True) else: conn.putrequest(method.upper(), url, skip_host=True, skip_accept_encoding=True) for key, value in headers: conn.putheader(key, value) conn.endheaders() if body is not None: conn.send(body) # Handle response response = conn.getresponse() s, h, b = shb(response) if not hasattr(http_conn, "host"): # We made our own conn instance. Close it. conn.close() return s, h, b except socket.error: time.sleep(0.5) raise # Add any exceptions which your web framework handles # normally (that you don't want server_error to trap). ignored_exceptions = [] # You'll want set this to True when you can't guarantee # that each response will immediately follow each request; # for example, when handling requests via multiple threads. ignore_all = False class ServerError(Exception): on = False def server_error(exc=None): """Server debug hook. Return True if exception handled, False if ignored. You probably want to wrap this, so you can still handle an error using your framework when it's ignored. """ if exc is None: exc = sys.exc_info() if ignore_all or exc[0] in ignored_exceptions: return False else: ServerError.on = True print("") print("".join(traceback.format_exception(*exc))) return True