Add an `api` cli subcommand for console testing

Add `piker api <method> <kwargs>` for easy testing of the
underlying broker api from the console.

piker/brokers/cli.py

@@ -1,24 +1,26 @@
 """
 Console interface to broker client/daemons.
 """
-import importlib
-from pprint import pformat
+import json
+from functools import partial
+from importlib import import_module
+
 import click
 import trio
-from ..log import get_console_log
+
+from ..log import get_console_log, colorize_json
 
 
-def run(loglevel, main):
+def run(main, loglevel='info'):
     log = get_console_log(loglevel)
 
-    # main loop
+    # main sandwich
     try:
-        client = trio.run(main)
+        return trio.run(main)
     except Exception as err:
         log.exception(err)
-    else:
-        log.debug(
-            f"Exiting with last access info:\n{pformat(client.access_data)}\n")
+    finally:
+        log.debug("Exiting pikerd")
 
 
 @click.command()
@@ -26,5 +28,34 @@ def run(loglevel, main):
 @click.option('--loglevel', '-l', default='info', help='Logging level')
 def pikerd(broker, loglevel):
     # import broker module daemon entry point
-    brokermod = importlib.import_module('.' + broker, 'piker.brokers') 
-    run(loglevel, brokermod.serve_forever)
+    brokermod = import_module('.' + broker, 'piker.brokers')
+    run(brokermod.serve_forever, loglevel)
+
+
+@click.group()
+def cli():
+    pass
+
+
+@cli.command()
+@click.option('--broker', default='questrade', help='Broker backend to use')
+@click.option('--loglevel', '-l', default='warning', help='Logging level')
+@click.argument('meth', nargs=1)
+@click.argument('kwargs', nargs=-1, required=True)
+def api(meth, kwargs, loglevel, broker):
+    """Client for testing broker API methods with pretty printing of output.
+    """
+    log = get_console_log(loglevel)
+    brokermod = import_module('.' + broker, 'piker.brokers')
+
+    _kwargs = {}
+    for kwarg in kwargs:
+        if '=' not in kwarg:
+            log.error(f"kwarg `{kwarg}` must be of form <key>=<value>")
+        else:
+            key, _, value = kwarg.partition('=')
+            _kwargs[key] = value
+
+    data = run(partial(brokermod.api, meth, **_kwargs), loglevel=loglevel)
+    if data:
+        click.echo(colorize_json(data))