Better handle bad input to query RPC call

Based on #559.  Also:

- remove unused import
- restore timeout to 15s
- handle invalid input by catching at a higher level
  and converting to RPCError

electrumx/server/chain_state.py

@@ -6,8 +6,6 @@
 # and warranty status of this software.
 
 
-import asyncio
-
 from aiorpcx import run_in_thread
 
 from electrumx.lib.hash import hash_to_hex_str
@@ -95,13 +93,9 @@ class ChainState(object):
             except ValueError:
                 pass
 
-            try:
-                hashX = coin.address_to_hashX(arg)
-                lines.append(f'Address: {arg}')
-                return hashX
-            except Base58Error:
-                print(f'Ingoring unknown arg: {arg}')
-                return None
+            hashX = coin.address_to_hashX(arg)
+            lines.append(f'Address: {arg}')
+            return hashX
 
         for arg in args:
             hashX = arg_to_hashX(arg)

electrumx/server/session.py

@@ -28,7 +28,7 @@ import electrumx
 import electrumx.lib.text as text
 import electrumx.lib.util as util
 from electrumx.lib.hash import (sha256, hash_to_hex_str, hex_str_to_hash,
-                                HASHX_LEN)
+                                HASHX_LEN, Base58Error)
 from electrumx.lib.peer import Peer
 from electrumx.server.daemon import DaemonError
 from electrumx.server.peers import PeerManager
@@ -384,7 +384,10 @@ class SessionManager(object):
 
     async def rpc_query(self, items, limit):
         '''Return a list of data about server peers.'''
-        return await self.chain_state.query(items, limit)
+        try:
+            return await self.chain_state.query(items, limit)
+        except Base58Error as e:
+            raise RPCError(BAD_REQUEST, e.args[0]) from None
 
     async def rpc_sessions(self):
         '''Return statistics about connected sessions.'''

electrumx_rpc

@@ -113,7 +113,7 @@ def main():
     # aiorpcX makes this so easy...
     async def send_request():
         try:
-            async with timeout_after(1):
+            async with timeout_after(15):
                 async with ClientSession('localhost', port) as session:
                     result = await session.send_request(method, args)
                     if method in ('query', ):