[experiments] Add status command

This allows to get the JSON data about the current
state of execution of an experiment.

beat/cmdline/experiments.py

@@ -878,14 +878,52 @@ def cancel(ctx, name):
 @click.argument("name", nargs=1)
 @click.pass_context
 def reset(ctx, name):
-    """Cancel an experiment on the platform"""
+    """Reset an experiment on the platform"""
 
     config = ctx.meta.get("config")
     with common.make_webapi(config) as webapi:
         status, _ = webapi.post("/api/v1/experiments/{}/reset/".format(name))
+
+    if status != six.moves.http_client.OK:
+        logger.error(
+            "failed to reset {} on `{}', reason: {}".format(
+                name, webapi.platform, six.moves.http_client.responses[status]
+            )
+        )
+
+
+@experiments.command()
+@click.argument("name", nargs=1)
+@click.pass_context
+def status(ctx, name):
+    """Shows the current status of a running experiment"""
+
+    config = ctx.meta.get("config")
+
+    with common.make_webapi(config) as webapi:
+        fields = ",".join(
+            [
+                "status",
+                "blocks_status",
+                "done",
+                "errors",
+                "execution_info",
+                "execution_order",
+                "results",
+                "started",
+                "display_start_date",
+                "display_end_date",
+            ]
+        )
+        status, answer = webapi.get(
+            "/api/v1/experiments/{}/?fields={}".format(name, fields)
+        )
         if status != six.moves.http_client.OK:
             logger.error(
-                "failed to reset {} on `{}', reason: {}".format(
+                "failed to get current state of {} on `{}', reason: {}".format(
                     name, webapi.platform, six.moves.http_client.responses[status]
                 )
             )
+        else:
+            data = simplejson.loads(answer)
+            print(simplejson.dumps(data, indent=4))