From a71a8ebe8fd2c7a25bf7188fbfcf73c068b0b84d Mon Sep 17 00:00:00 2001
From: Yves <yvesf-git@xapek.org>
Date: Sat, 13 Mar 2010 15:55:16 +0100
Subject: vereinfacht

---
 proxy.py | 63 +++++++++++++++++++++++++++++++++++----------------------------
 1 file changed, 35 insertions(+), 28 deletions(-)

diff --git a/proxy.py b/proxy.py
index 44c7365..0e3f7b5 100755
--- a/proxy.py
+++ b/proxy.py
@@ -42,7 +42,7 @@ class Fetcher(asynchat.async_chat):
         self.start_time = 0
         self.stop_time = 0
         self.http_status = ""
-        self.http_header = ""
+        self.http_header = StringIO.StringIO()
         self.state = 0 #0=status, 1=header, 2=body
  
         asynchat.async_chat.__init__(self)
@@ -70,8 +70,9 @@ class Fetcher(asynchat.async_chat):
 
     def collect_incoming_data(self, data):
         if self.state==2: #body
-            self.reader.handle_incoming_data(self, data)
-            self.pos += len(data)
+            length = len(data)
+            self.reader.handle_incoming_data(self, data, length)
+            self.pos += length
             if self.pos >= self.range[1]: 
                 self.stop_time = time.time()
                 print self, "finished"
@@ -79,7 +80,7 @@ class Fetcher(asynchat.async_chat):
                 self.reader.handle_incoming_data(self)
                 self.close()
         elif self.state ==1: #header
-            self.http_header += data
+            self.http_header.write( data )
         else: #status
             self.http_status += data 
 
@@ -95,6 +96,15 @@ class Fetcher(asynchat.async_chat):
     def __str__(self):
         return "<Fetcher proxy=%s url=%s range=%s" % (self.proxy, urlparse.urlunparse(self.url), self.range)
 
+class StringIOProducer(object):
+    def __init__(self,buf, amt=1440):
+        self.buf=buf
+        self.amt = amt
+        self.buf.seek(0)
+
+    def more(self):
+        return self.buf.read(self.amt)
+
 class MultipleProxyReader(object):
     def __init__(self, channel, url, header, content_length):
         self.channel = channel
@@ -112,11 +122,15 @@ class MultipleProxyReader(object):
         for proxy in ENDPOINTS:
             self.fetchers.append( Fetcher(self, proxy, self.url, self.header, self.next_range(INIT_BLOCKSIZE)) )
 
-    def handle_incoming_data(self, fetcher, data=None):
+    def handle_incoming_data(self, fetcher, data=None, length=0):
         if not data:
             self.fetchers = filter(lambda f: f != fetcher, self.fetchers)
         else:
-            heappush(self.blocks, (fetcher.pos, data))
+            heappush(self.blocks, (fetcher.pos, data, length))
+
+        if self.channel.is_closed:
+            print self, "request side closed the connection"
+            return
 
         if fetcher.range[1] - fetcher.pos < FETCHER_JUMPSTART \
                 and self.fetch_pos + 1 < self.content_length and not self.channel.is_closed \
@@ -127,8 +141,19 @@ class MultipleProxyReader(object):
             print "Start new Fetcher, bs=%s range=%s" % (blocksize,fetch_range)
             self.fetchers.append( Fetcher(self, fetcher.proxy, self.url, self.header, fetch_range) )
 
-        while self.send_next_data():
-            pass
+        buf = StringIO.StringIO()
+        while len(self.blocks)>0 and min(self.blocks)[0] == self.write_pos:
+            item = heappop(self.blocks)
+            buf.write(item[1])
+            self.write_pos += item[2]
+
+        if buf.tell() > 0:
+            self.channel.push_with_producer(StringIOProducer(buf))
+
+        if self.write_pos + 1 >= self.content_length:
+            print self, "job done %s blocks left" % len(self.blocks)
+            self.channel.is_closed = True
+            self.channel.close_when_done()
 
     def next_range(self, suggested_blocksize):
         start = self.fetch_pos
@@ -143,33 +168,15 @@ class MultipleProxyReader(object):
 
             self.channel.push("HTTP/1.0 200 OK\r\n")
             # Sends header from first response
-            headers = httplib.HTTPMessage(StringIO.StringIO(header))
+            header.seek(0)
+            headers = httplib.HTTPMessage(header)
             for key in filter(lambda k: k not in ("content-range", "content-length"), headers.dict.keys()):
                 self.channel.push("%s: %s\r\n" % (key, headers.dict[key]))
             self.channel.push("Content-Length: %s" % self.content_length)
             self.channel.push("X-Proxy: Magicproxy (superpower activated)\r\n")
             self.channel.push("\r\n")
 
-    def send_next_data(self):
-        if self.channel.is_closed:
-            print self, "request side closed the connection"
-            self.channel.close_when_done()
-            #XXX terminate all running fetcher
-            return False
-
-        #print self, "expect data at %s in" % self.write_pos, self.blocks.keys()
-        if len(self.blocks)>0 and min(self.blocks)[0] == self.write_pos:
-            item = heappop(self.blocks)
-            self.channel.push(item[1])
-            self.write_pos += len(item[1])
-            return True
-            
-        if self.write_pos + 1 >= self.content_length:
-            print self, "job done %s blocks left" % len(self.blocks)
-            #XXX prevent next calls to send_next_data
-            self.channel.close_when_done()
 
-        return False
 
     def __str__(self):
         return "<MultipleProxyReader url=%s content_length=%s>" % (urlparse.urlunparse(self.url), self.content_length)
-- 
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