Merge branch 'release-0.7.10' into develop

RELEASE-NOTES

@@ -1,3 +1,10 @@
+version 0.7.10
+--------------
+
+- replaced MAX_HIST environment variable with MAX_SEND, see docs/ENV-NOTES.
+  Large requests are blocked and logged.  The logs should help you determine
+  if the requests are genuine (perhaps requiring a higher MAX_SEND) or abuse.
+
 version 0.7.9
 -------------
 

docs/ENV-NOTES

@@ -45,17 +45,20 @@ each and are processed efficiently.  I feel the defaults are low and
 encourage you to raise them.
 
 MAX_SEND         - maximum size of a response message to send over the wire,
-                   in bytes.  Defaults to 250,000.  The current Electrum
+                   in bytes.  Defaults to 350,000 and will treat smaller
-                   protocol has a flaw in that address histories must be
+                   values as the same because standard Electrum protocol
-                   served all at once or not at all, an obvious avenue for
+                   header chunk requests are nearly that large.
-                   abuse.  This limit is a stop-gap until the protocol is
+                   The Electrum protocol has a flaw in that address
-                   improved to admit incremental history requests.
+                   histories must be served all at once or not at all,
-                   Each history entry is appoximately 100 bytes so the
+                   an obvious avenue for abuse.  MAX_SEND is a
-                   default is equivalent to a history limit of around 2,500
+                   stop-gap until the protocol is improved to admit
+                   incremental history requests.  Each history entry
+                   is appoximately 100 bytes so the default is
+                   equivalent to a history limit of around 3,500
                    entries, which should be ample for most legitimate
-                   users.  Increasing by a single-digit factor is likely fine
+                   users.  Increasing by a single-digit factor is
-                   but bear in mind one client can request history for
+                   likely fine but bear in mind one client can request
-                   multiple addresses.
+                   history for multiple addresses.
 MAX_SUBS         - maximum number of address subscriptions across all
                    sessions.  Defaults to 250,000.
 MAX_SESSION_SUBS - maximum number of address subscriptions permitted to a

server/protocol.py

@@ -227,7 +227,7 @@ class ServerManager(util.LoggedClass):
         self.max_subs = env.max_subs
         self.subscription_count = 0
         self.futures = []
-        env.max_send = max(1000, env.max_send)
+        env.max_send = max(350000, env.max_send)
         self.logger.info('max response size {:,d} bytes'.format(env.max_send))
         self.logger.info('max subscriptions across all sessions: {:,d}'
                          .format(self.max_subs))

server/version.py

@@ -1 +1 @@
-VERSION = "ElectrumX 0.7.9"
+VERSION = "ElectrumX 0.7.10"