X-Git-Url: https://jfr.im/git/z_archive/twitter.git/blobdiff_plain/e80f5491b60fcd05bd3f1f112b1f014779050b2a..3f6ca83dfc697b71974d2fa3b10b4e68c4d4c621:/twitter/stream.py

diff --git a/twitter/stream.py b/twitter/stream.py
index 101d31b..6ecc49e 100644
--- a/twitter/stream.py
+++ b/twitter/stream.py
@@ -12,37 +12,38 @@ import sys, select, time
 
 from .api import TwitterCall, wrap_response, TwitterHTTPError
 
-def recv_chunk(sock):  # -> bytearray:
+python27_3 = sys.version_info >= (2, 7)
+def recv_chunk(sock): # -> bytearray:
 
-    buf = sock.recv(8)  # Scan for an up to 16MiB chunk size (0xffffff).
-    crlf = buf.find(b'\r\n')  # Find the HTTP chunk size.
+    header = sock.recv(8)  # Scan for an up to 16MiB chunk size (0xffffff).
+    crlf = header.find(b'\r\n')  # Find the HTTP chunk size.
 
     if crlf > 0:  # If there is a length, then process it
 
-        remaining = int(buf[:crlf], 16)  # Decode the chunk size.
-
+        size = int(header[:crlf], 16)  # Decode the chunk size. Rarely exceeds 8KiB.
+        chunk = bytearray(size)
         start = crlf + 2  # Add in the length of the header's CRLF pair.
-        end = len(buf) - start
-
-        chunk = bytearray(remaining)
 
-        if remaining <= 2:  # E.g. an HTTP chunk with just a keep-alive delimiter or end of stream (0).
-            chunk[:remaining] = buf[start:start + remaining]
-        # There are several edge cases (remaining == [3-6]) as the chunk size exceeds the length
+        if size <= 3:  # E.g. an HTTP chunk with just a keep-alive delimiter or end of stream (0).
+            chunk[:size] = header[start:start + size]
+        # There are several edge cases (size == [4-6]) as the chunk size exceeds the length
         # of the initial read of 8 bytes. With Twitter, these do not, in practice, occur. The
         # shortest JSON message starts with '{"limit":{'. Hence, it exceeds in size the edge cases
         # and eliminates the need to address them.
         else:  # There is more to read in the chunk.
-            chunk[:end] = buf[start:]
-            chunk[end:] = sock.recv(remaining - end)
+            end = len(header) - start
+            chunk[:end] = header[start:]
+            if python27_3:  # When possible, use less memory by reading directly into the buffer.
+                buffer = memoryview(chunk)[end:]  # Create a view into the bytearray to hold the rest of the chunk.
+                sock.recv_into(buffer)
+            else:  # less efficient for python2.6 compatibility
+                chunk[end:] = sock.recv(max(0, size - end))
             sock.recv(2)  # Read the trailing CRLF pair. Throw it away.
 
         return chunk
 
     return bytearray()
 
-##  recv_chunk()
-
 
 class TwitterJSONIter(object):
 
@@ -67,23 +68,20 @@ class TwitterJSONIter(object):
                 res, ptr = json_decoder.raw_decode(buf)
                 buf = buf[ptr:]
                 yield wrap_response(res, self.handle.headers)
-                timer = time.time()
                 continue
             except ValueError as e:
                 if self.block: pass
                 else: yield None
             try:
                 buf = buf.lstrip()  # Remove any keep-alive delimiters to detect hangups.
-                if self.timeout:
+                if self.timeout and not buf:  # This is a non-blocking read.
                     ready_to_read = select.select([sock], [], [], self.timeout)
-                    if ready_to_read[0]:
-                        buf += recv_chunk(sock).decode('utf-8')  # This is a non-blocking read.
-                        if time.time() - timer > self.timeout:
-                            yield {'timeout': True}
-                    else: yield {'timeout': True}
-                else:
-                    buf += recv_chunk(sock).decode('utf-8')
-                if not buf and self.block:
+                    if not ready_to_read[0] and time.time() - timer > self.timeout:
+                        yield {'timeout': True}
+                        continue
+                timer = time.time()
+                buf += recv_chunk(sock).decode('utf-8')
+                if not buf:
                     yield {'hangup': True}
                     break
             except SSLError as e: