Merge pull request #177 from laodc/master

Added SERVER_(SUB)VERSION to banner variables

docs/ENVIRONMENT.rst

@@ -116,8 +116,10 @@ These environment variables are optional:
   You can place several meta-variables in your banner file, which will be
   replaced before serving to a client.
 
-  + **$VERSION** is replaced with the ElectrumX version you are
-    runnning, such as *ElectrumX 0.9.22*.
+  + **$SERVER_VERSION** is replaced with the ElectrumX version you are
+    runnning, such as *1.0.10*.
+  + **$SERVER_SUBVERSION** is replaced with the ElectrumX user agent
+    string.  For example, `ElectrumX 1.0.10`.
   + **$DAEMON_VERSION** is replaced with the daemon's version as a
     dot-separated string. For example *0.12.1*.
   + **$DAEMON_SUBVERSION** is replaced with the daemon's user agent

server/session.py

@@ -288,8 +288,11 @@ class ElectrumX(SessionBase):
         minor, revision = divmod(minor, 10000)
         revision //= 100
         daemon_version = '{:d}.{:d}.{:d}'.format(major, minor, revision)
+        server_version = version.VERSION.split()[-1]
         for pair in [
-                ('$VERSION', version.VERSION),
+                ('$VERSION', version.VERSION), # legacy
+                ('$SERVER_VERSION', server_version),
+                ('$SERVER_SUBVERSION', version.VERSION),
                 ('$DAEMON_VERSION', daemon_version),
                 ('$DAEMON_SUBVERSION', network_info['subversion']),
                 ('$DONATION_ADDRESS', self.env.donation_address),