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//proc/self/root/usr/lib/python3/dist-packages/supervisor/http_client.py
# this code based on Daniel Krech's RDFLib HTTP client code (see rdflib.net) import sys import socket from supervisor.compat import as_bytes from supervisor.compat import as_string from supervisor.compat import encodestring from supervisor.compat import PY2 from supervisor.compat import urlparse from supervisor.medusa import asynchat_25 as asynchat CR = b'\x0d' LF = b'\x0a' CRLF = CR+LF class Listener(object): def status(self, url, status): pass def error(self, url, error): sys.stderr.write("%s %s\n" % (url, error)) def response_header(self, url, name, value): pass def done(self, url): pass def feed(self, url, data): try: sdata = as_string(data) except UnicodeDecodeError: sdata = 'Undecodable: %r' % data # We've got Unicode data in sdata now, but writing to stdout sometimes # fails - see issue #1231. try: sys.stdout.write(sdata) except UnicodeEncodeError: if PY2: # This might seem like The Wrong Thing To Do (writing bytes # rather than text to an output stream), but it seems to work # OK for Python 2.7. sys.stdout.write(data) else: s = ('Unable to write Unicode to stdout because it has ' 'encoding %s' % sys.stdout.encoding) raise ValueError(s) sys.stdout.flush() def close(self, url): pass class HTTPHandler(asynchat.async_chat): def __init__( self, listener, username='', password=None, conn=None, map=None ): asynchat.async_chat.__init__(self, conn, map) self.listener = listener self.user_agent = 'Supervisor HTTP Client' self.buffer = b'' self.set_terminator(CRLF) self.connected = 0 self.part = self.status_line self.chunk_size = 0 self.chunk_read = 0 self.length_read = 0 self.length = 0 self.encoding = None self.username = username self.password = password self.url = None self.error_handled = False def get(self, serverurl, path=''): if self.url is not None: raise AssertionError('Already doing a get') self.url = serverurl + path scheme, host, path_ignored, params, query, fragment = urlparse.urlparse( self.url) if not scheme in ("http", "unix"): raise NotImplementedError self.host = host if ":" in host: hostname, port = host.split(":", 1) port = int(port) else: hostname = host port = 80 self.path = path self.port = port if scheme == "http": ip = hostname self.create_socket(socket.AF_INET, socket.SOCK_STREAM) self.connect((ip, self.port)) elif scheme == "unix": socketname = serverurl[7:] self.create_socket(socket.AF_UNIX, socket.SOCK_STREAM) self.connect(socketname) def close(self): self.listener.close(self.url) self.connected = 0 self.del_channel() self.socket.close() self.url = "CLOSED" def header(self, name, value): self.push('%s: %s' % (name, value)) self.push(CRLF) def handle_error(self): if self.error_handled: return if 1 or self.connected: t,v,tb = sys.exc_info() msg = 'Cannot connect, error: %s (%s)' % (t, v) self.listener.error(self.url, msg) self.part = self.ignore self.close() self.error_handled = True del t del v del tb def handle_connect(self): self.connected = 1 method = "GET" version = "HTTP/1.1" self.push("%s %s %s" % (method, self.path, version)) self.push(CRLF) self.header("Host", self.host) self.header('Accept-Encoding', 'chunked') self.header('Accept', '*/*') self.header('User-agent', self.user_agent) if self.password: auth = '%s:%s' % (self.username, self.password) auth = as_string(encodestring(as_bytes(auth))).strip() self.header('Authorization', 'Basic %s' % auth) self.push(CRLF) self.push(CRLF) def feed(self, data): self.listener.feed(self.url, data) def collect_incoming_data(self, bytes): self.buffer = self.buffer + bytes if self.part==self.body: self.feed(self.buffer) self.buffer = b'' def found_terminator(self): self.part() self.buffer = b'' def ignore(self): self.buffer = b'' def status_line(self): line = self.buffer version, status, reason = line.split(None, 2) status = int(status) if not version.startswith(b'HTTP/'): raise ValueError(line) self.listener.status(self.url, status) if status == 200: self.part = self.headers else: self.part = self.ignore msg = 'Cannot read, status code %s' % status self.listener.error(self.url, msg) self.close() return version, status, reason def headers(self): line = self.buffer if not line: if self.encoding == b'chunked': self.part = self.chunked_size else: self.part = self.body self.set_terminator(self.length) else: name, value = line.split(b':', 1) if name and value: name = name.lower() value = value.strip() if name == b'transfer-encoding': self.encoding = value elif name == b'content-length': self.length = int(value) self.response_header(name, value) def response_header(self, name, value): self.listener.response_header(self.url, name, value) def body(self): self.done() self.close() def done(self): self.listener.done(self.url) def chunked_size(self): line = self.buffer if not line: return chunk_size = int(line.split()[0], 16) if chunk_size==0: self.part = self.trailer else: self.set_terminator(chunk_size) self.part = self.chunked_body self.length += chunk_size def chunked_body(self): line = self.buffer self.set_terminator(CRLF) self.part = self.chunked_size self.feed(line) def trailer(self): # http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.6.1 # trailer = *(entity-header CRLF) line = self.buffer if line == CRLF: self.done() self.close()