move blocking/eventsource out to a separate file

src/wormhole/blocking/eventsource.py

@@ -0,0 +1,41 @@
+import requests
+
+class EventSourceFollower:
+    def __init__(self, url, timeout):
+        self.resp = requests.get(url,
+                                 headers={"accept": "text/event-stream"},
+                                 stream=True,
+                                 timeout=timeout)
+        self.resp.raise_for_status()
+
+    def close(self):
+        self.resp.close()
+
+    def _get_fields(self, lines):
+        while True:
+            first_line = lines.next() # raises StopIteration when closed
+            fieldname, data = first_line.split(": ", 1)
+            data_lines = [data]
+            while True:
+                next_line = lines.next()
+                if not next_line: # empty string, original was "\n"
+                    yield (fieldname, "\n".join(data_lines))
+                    break
+                data_lines.append(next_line)
+
+    def iter_events(self):
+        # I think Request.iter_lines and .iter_content use chunk_size= in a
+        # funny way, and nothing happens until at least that much data has
+        # arrived. So unless we set chunk_size=1, we won't hear about lines
+        # for a long time. I'd prefer that chunk_size behaved like
+        # read(size), and gave you 1<=x<=size bytes in response.
+        eventtype = "message"
+        lines_iter = self.resp.iter_lines(chunk_size=1)
+        for (fieldname, data) in self._get_fields(lines_iter):
+            if fieldname == "data":
+                yield (eventtype, data)
+                eventtype = "message"
+            elif fieldname == "event":
+                eventtype = data
+            else:
+                print("weird fieldname", fieldname, data)

src/wormhole/blocking/transcribe.py

@@ -5,6 +5,7 @@ from spake2 import SPAKE2_A, SPAKE2_B
 from nacl.secret import SecretBox
 from nacl.exceptions import CryptoError
 from nacl import utils
+from .eventsource import EventSourceFollower
 from .. import __version__
 from .. import codes
 from ..errors import ServerError
@@ -48,46 +49,6 @@ class ReceiverWrongPasswordError(WrongPasswordError):
 # GET  /CHANNEL-ID/SIDE/poll/MSGNUM (eventsource)   -> STR, STR, ..
 # POST /CHANNEL-ID/SIDE/deallocate                  -> waiting | deleted
 
-class EventSourceFollower:
-    def __init__(self, url, timeout):
-        self.resp = requests.get(url,
-                                 headers={"accept": "text/event-stream"},
-                                 stream=True,
-                                 timeout=timeout)
-        self.resp.raise_for_status()
-
-    def close(self):
-        self.resp.close()
-
-    def _get_fields(self, lines):
-        while True:
-            first_line = lines.next() # raises StopIteration when closed
-            fieldname, data = first_line.split(": ", 1)
-            data_lines = [data]
-            while True:
-                next_line = lines.next()
-                if not next_line: # empty string, original was "\n"
-                    yield (fieldname, "\n".join(data_lines))
-                    break
-                data_lines.append(next_line)
-
-    def iter_events(self):
-        # I think Request.iter_lines and .iter_content use chunk_size= in a
-        # funny way, and nothing happens until at least that much data has
-        # arrived. So unless we set chunk_size=1, we won't hear about lines
-        # for a long time. I'd prefer that chunk_size behaved like
-        # read(size), and gave you 1<=x<=size bytes in response.
-        eventtype = "message"
-        lines_iter = self.resp.iter_lines(chunk_size=1)
-        for (fieldname, data) in self._get_fields(lines_iter):
-            if fieldname == "data":
-                yield (eventtype, data)
-                eventtype = "message"
-            elif fieldname == "event":
-                eventtype = data
-            else:
-                print("weird fieldname", fieldname, data)
-
 class Common:
     def url(self, verb, msgnum=None):
         url = "%s%d/%s/%s" % (self.relay, self.channel_id, self.side, verb)