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producers.py
# -*- Mode: Python -*- RCS_ID = '$Id: producers.py,v 1.9 2004/04/21 13:56:28 akuchling Exp $' """ A collection of producers. Each producer implements a particular feature: They can be combined in various ways to get interesting and useful behaviors. For example, you can feed dynamically-produced output into the compressing producer, then wrap this with the 'chunked' transfer-encoding producer. """ from supervisor.medusa.asynchat_25 import find_prefix_at_end from supervisor.compat import as_bytes class simple_producer: """producer for a string""" def __init__ (self, data, buffer_size=1024): self.data = data self.buffer_size = buffer_size def more (self): if len (self.data) > self.buffer_size: result = self.data[:self.buffer_size] self.data = self.data[self.buffer_size:] return result else: result = self.data self.data = b'' return result class scanning_producer: """like simple_producer, but more efficient for large strings""" def __init__ (self, data, buffer_size=1024): self.data = data self.buffer_size = buffer_size self.pos = 0 def more (self): if self.pos < len(self.data): lp = self.pos rp = min ( len(self.data), self.pos + self.buffer_size ) result = self.data[lp:rp] self.pos += len(result) return result else: return b'' class lines_producer: """producer for a list of lines""" def __init__ (self, lines): self.lines = lines def more (self): if self.lines: chunk = self.lines[:50] self.lines = self.lines[50:] return '\r\n'.join(chunk) + '\r\n' else: return '' class buffer_list_producer: """producer for a list of strings""" # i.e., data == ''.join(buffers) def __init__ (self, buffers): self.index = 0 self.buffers = buffers def more (self): if self.index >= len(self.buffers): return b'' else: data = self.buffers[self.index] self.index += 1 return data class file_producer: """producer wrapper for file[-like] objects""" # match http_channel's outgoing buffer size out_buffer_size = 1<<16 def __init__ (self, file): self.done = 0 self.file = file def more (self): if self.done: return b'' else: data = self.file.read (self.out_buffer_size) if not data: self.file.close() del self.file self.done = 1 return b'' else: return data # A simple output producer. This one does not [yet] have # the safety feature builtin to the monitor channel: runaway # output will not be caught. # don't try to print from within any of the methods # of this object. class output_producer: """Acts like an output file; suitable for capturing sys.stdout""" def __init__ (self): self.data = b'' def write (self, data): lines = data.split('\n') data = '\r\n'.join(lines) self.data += data def writeline (self, line): self.data = self.data + line + '\r\n' def writelines (self, lines): self.data = self.data + '\r\n'.join(lines) + '\r\n' def flush (self): pass def softspace (self, *args): pass def more (self): if self.data: result = self.data[:512] self.data = self.data[512:] return result else: return '' class composite_producer: """combine a fifo of producers into one""" def __init__ (self, producers): self.producers = producers def more (self): while len(self.producers): p = self.producers[0] d = p.more() if d: return d else: self.producers.pop(0) else: return b'' class globbing_producer: """ 'glob' the output from a producer into a particular buffer size. helps reduce the number of calls to send(). [this appears to gain about 30% performance on requests to a single channel] """ def __init__ (self, producer, buffer_size=1<<16): self.producer = producer self.buffer = b'' self.buffer_size = buffer_size def more (self): while len(self.buffer) < self.buffer_size: data = self.producer.more() if data: self.buffer = self.buffer + data else: break r = self.buffer self.buffer = b'' return r class hooked_producer: """ A producer that will call <function> when it empties,. with an argument of the number of bytes produced. Useful for logging/instrumentation purposes. """ def __init__ (self, producer, function): self.producer = producer self.function = function self.bytes = 0 def more (self): if self.producer: result = self.producer.more() if not result: self.producer = None self.function (self.bytes) else: self.bytes += len(result) return result else: return '' # HTTP 1.1 emphasizes that an advertised Content-Length header MUST be # correct. In the face of Strange Files, it is conceivable that # reading a 'file' may produce an amount of data not matching that # reported by os.stat() [text/binary mode issues, perhaps the file is # being appended to, etc..] This makes the chunked encoding a True # Blessing, and it really ought to be used even with normal files. # How beautifully it blends with the concept of the producer. class chunked_producer: """A producer that implements the 'chunked' transfer coding for HTTP/1.1. Here is a sample usage: request['Transfer-Encoding'] = 'chunked' request.push ( producers.chunked_producer (your_producer) ) request.done() """ def __init__ (self, producer, footers=None): self.producer = producer self.footers = footers def more (self): if self.producer: data = self.producer.more() if data: s = '%x' % len(data) return as_bytes(s) + b'\r\n' + data + b'\r\n' else: self.producer = None if self.footers: return b'\r\n'.join([b'0'] + self.footers) + b'\r\n\r\n' else: return b'0\r\n\r\n' else: return b'' try: import zlib except ImportError: zlib = None class compressed_producer: """ Compress another producer on-the-fly, using ZLIB """ # Note: It's not very efficient to have the server repeatedly # compressing your outgoing files: compress them ahead of time, or # use a compress-once-and-store scheme. However, if you have low # bandwidth and low traffic, this may make more sense than # maintaining your source files compressed. # # Can also be used for compressing dynamically-produced output. def __init__ (self, producer, level=5): self.producer = producer self.compressor = zlib.compressobj (level) def more (self): if self.producer: cdata = b'' # feed until we get some output while not cdata: data = self.producer.more() if not data: self.producer = None return self.compressor.flush() else: cdata = self.compressor.compress (data) return cdata else: return b'' class escaping_producer: """A producer that escapes a sequence of characters""" # Common usage: escaping the CRLF.CRLF sequence in SMTP, NNTP, etc... def __init__ (self, producer, esc_from='\r\n.', esc_to='\r\n..'): self.producer = producer self.esc_from = esc_from self.esc_to = esc_to self.buffer = b'' self.find_prefix_at_end = find_prefix_at_end def more (self): esc_from = self.esc_from esc_to = self.esc_to buffer = self.buffer + self.producer.more() if buffer: buffer = buffer.replace(esc_from, esc_to) i = self.find_prefix_at_end (buffer, esc_from) if i: # we found a prefix self.buffer = buffer[-i:] return buffer[:-i] else: # no prefix, return it all self.buffer = b'' return buffer else: return buffer
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