More client improvements

- colorize json response data in logs
- support ``refresh_token`` retrieval from user if the token for some
  reason expires while the client is live
- extend api method support for markets, search, symbols, and quotes
- support "proxying" through api calls via an ``api`` coro for one off
  client queries (useful for cli testing)

piker/brokers/questrade.py

@@ -1,14 +1,16 @@
 """
 Questrade API backend.
 """
-import trio
-from . import config
-from ..log import get_logger
-from pprint import pformat
+import json
 import time
 import datetime
+
+import trio
 from async_generator import asynccontextmanager
 
+from . import config
+from ..log import get_logger, colorize_json
+
 # TODO: move to urllib3/requests once supported
 import asks
 asks.init('trio')
@@ -31,40 +33,32 @@ def resproc(
 
     Raise the appropriate error on non-200 OK responses.
     """
-    data = resp.json()
-    log.debug(f"Received json contents:\n{pformat(data)}\n")
-
     if not resp.status_code == 200:
         raise QuestradeError(resp.body)
 
+    try:
+        data = resp.json()
+    except json.decoder.JSONDecodeError:
+        log.exception(f"Failed to process {resp}")
+    else:
+        log.debug(f"Received json contents:\n{colorize_json(data)}")
+
     return data if return_json else resp
 
 
-class API:
-    """Questrade API at its finest.
-    """
-    def __init__(self, session: asks.Session):
-        self._sess = session
-
-    async def _request(self, path: str) -> dict:
-        resp = await self._sess.get(path=f'/{path}')
-        return resproc(resp)
-
-    async def accounts(self):
-        return await self._request('accounts')
-
-    async def time(self):
-        return await self._request('time')
-
-
 class Client:
     """API client suitable for use as a long running broker daemon.
     """
-    def __init__(self, config: dict):
+    def __init__(self, config: 'configparser.ConfigParser'):
         self._sess = asks.Session()
         self.api = API(self._sess)
-        self.access_data = config
+        self._conf = config
+        self.access_data = {}
         self.user_data = {}
+        self._apply_config(config)
+
+    def _apply_config(self, config):
+        self.access_data = dict(self._conf['questrade'])
 
     async def _new_auth_token(self) -> dict:
         """Request a new api authorization ``refresh_token``.
@@ -113,7 +107,8 @@ class Client:
         (based on a ``expires_at`` time stamp stored in the brokers.ini config)
         expired (normally has a lifetime of 3 days). If ``false is set then
         and refreshs token if necessary using the ``refresh_token``. If the
-        ``refresh_token`` has expired a new one needs to be provided by the user.
+        ``refresh_token`` has expired a new one needs to be provided by the
+        user.
         """
         access_token = self.access_data.get('access_token')
         expires = float(self.access_data.get('expires_at', 0))
@@ -122,11 +117,20 @@ class Client:
         if not access_token or (expires < time.time()) or force_refresh:
             log.info(f"Refreshing access token {access_token} which expired at"
                      f" {expires_stamp}")
-            data = await self._new_auth_token()
+            try:
+                data = await self._new_auth_token()
+            except QuestradeError as qterr:
+                # likely config ``refresh_token`` is expired
+                if qterr.args[0].decode() == 'Bad Request':
+                    _token_from_user(self._conf)
+                    self._apply_config(self._conf)
+                    data = await self._new_auth_token()
 
             # store absolute token expiry time
             self.access_data['expires_at'] = time.time() + float(
                 data['expires_in'])
+            # write to config on disk
+            write_conf(self)
         else:
             log.info(f"\nCurrent access token {access_token} expires at"
                      f" {expires_stamp}\n")
@@ -135,6 +139,53 @@ class Client:
         return self.access_data
 
 
+class API:
+    """Questrade API at its finest.
+    """
+    def __init__(self, session: asks.Session):
+        self._sess = session
+
+    async def _request(self, path: str, params=None) -> dict:
+        resp = await self._sess.get(path=f'/{path}', params=params)
+        return resproc(resp)
+
+    async def accounts(self) -> dict:
+        return await self._request('accounts')
+
+    async def time(self) -> dict:
+        return await self._request('time')
+
+    async def markets(self) -> dict:
+        return await self._request('markets')
+
+    async def search(self, prefix: str) -> dict:
+        return await self._request(
+            'symbols/search', params={'prefix': prefix})
+
+    async def symbols(self, ids: str = '', names: str = '') -> dict:
+        log.debug(f"Symbol lookup for {ids}")
+        return await self._request(
+            'symbols', params={'ids': ids, 'names': names})
+
+    async def quotes(self, ids: str) -> dict:
+        return await self._request('markets/quotes', params={'ids': ids})
+
+
+async def token_refresher(client):
+    """Coninually refresh the ``access_token`` near its expiry time.
+    """
+    while True:
+        await trio.sleep(
+            float(client.access_data['expires_at']) - time.time() - .1)
+        await client.ensure_access(force_refresh=True)
+
+
+def _token_from_user(conf: 'configparser.ConfigParser') -> None:
+    # get from user
+    refresh_token = input("Please provide your Questrade access token: ")
+    conf['questrade'] = {'refresh_token': refresh_token}
+
+
 def get_config() -> "configparser.ConfigParser":
     conf, path = config.load()
     if not conf.has_section('questrade') or (
@@ -142,19 +193,16 @@ def get_config() -> "configparser.ConfigParser":
     ):
         log.warn(
             f"No valid refresh token could be found in {path}")
-        # get from user
-        refresh_token = input("Please provide your Questrade access token: ")
-        conf['questrade'] = {'refresh_token': refresh_token}
+        _token_from_user(conf)
 
     return conf
 
 
-async def token_refresher(client):
-    """Coninually refresh the ``access_token`` near its expiry time.
+def write_conf(client):
+    """Save access creds to config file.
     """
-    while True:
-        await trio.sleep(float(client.access_data['expires_at']) - time.time() - .1)
-        await client.ensure_access()
+    client._conf['questrade'] = client.access_data
+    config.write(client._conf)
 
 
 @asynccontextmanager
@@ -162,8 +210,8 @@ async def get_client() -> Client:
     """Spawn a broker client.
     """
     conf = get_config()
-    log.debug(f"Loaded config:\n{pformat(dict(conf['questrade']))}\n")
-    client = Client(dict(conf['questrade']))
+    log.debug(f"Loaded config:\n{colorize_json(dict(conf['questrade']))}")
+    client = Client(conf)
     await client.ensure_access()
 
     try:
@@ -178,12 +226,10 @@ async def get_client() -> Client:
             await client.api.time()
 
         accounts = await client.api.accounts()
-        log.info(f"Available accounts:\n{pformat(accounts)}\n")
+        log.info(f"Available accounts:\n{colorize_json(accounts)}")
         yield client
     finally:
-        # save access creds for next run
-        conf['questrade'] = client.access_data
-        config.write(conf)
+        write_conf(client)
 
 
 async def serve_forever() -> None:
@@ -194,3 +240,16 @@ async def serve_forever() -> None:
         # await client._revoke_auth_token()
         async with trio.open_nursery() as nursery:
             nursery.start_soon(token_refresher, client)
+
+
+async def api(methname, **kwargs) -> dict:
+    async with get_client() as client:
+        meth = getattr(client.api, methname, None)
+        if meth is None:
+            log.error(f"No api method `{methname}` could be found?")
+        else:
+            arg = kwargs.get('arg')
+            if arg:
+                return await meth(arg)
+            else:
+                return await meth(**kwargs)