Implement Retrieval of plans, QPIs, and metrics

- All specs can be listed
- All specs can be individually retrieved
- API can be installed alongside qtip
- API can be hosted using command `qtip-api`

JIRA: QTIP-221
JIRA: QTIP-222

Change-Id: I1e80e6609cae1252cb2fcdc38c71b4bf6d02e8c9
Signed-off-by: akhilbatra898 <akhil.batra@research.iiit.ac.in>
(cherry picked from commit 15fceada86ad0d5dabe26365451aae9c95b36be1)

3 files changed, 48 insertions, 21 deletions

diff --git a/qtip/api/controllers/metric.py b/qtip/api/controllers/metric.py
index a026b5fc..86bf70f9 100644
--- a/qtip/api/controllers/metric.py
+++ b/qtip/api/controllers/metric.py
@@ -7,17 +7,26 @@
 # http://www.apache.org/licenses/LICENSE-2.0
 ##############################################################################
 
-import connexion
 import httplib
 
+import connexion
+
+from qtip.base import error
+from qtip.loader import metric
+
 
 def list_metrics():
-    return connexion.problem(httplib.NOT_IMPLEMENTED,
-                             'List metrics',
-                             'Metrics listing not implemented')
+    metric_list = list(metric.MetricSpec.list_all())
+    return metric_list, httplib.OK
 
 
 def get_metric(name):
-    return connexion.problem(httplib.NOT_IMPLEMENTED,
-                             'Get a metric',
-                             'metric retrieval not implemented')
+    try:
+        metric_spec = metric.MetricSpec(name)
+        return {'name': metric_spec.name,
+                'abspath': metric_spec.abspath,
+                'content': metric_spec.content}, httplib.OK
+    except error.NotFoundError:
+        return connexion.problem(httplib.NOT_FOUND,
+                                 'Metric Not Found',
+                                 'Requested metric `' + name + '` not found.')
diff --git a/qtip/api/controllers/plan.py b/qtip/api/controllers/plan.py
index e202b413..93836a32 100644
--- a/qtip/api/controllers/plan.py
+++ b/qtip/api/controllers/plan.py
@@ -7,20 +7,29 @@
 # http://www.apache.org/licenses/LICENSE-2.0
 ##############################################################################
 
-import connexion
 import httplib
 
+import connexion
+
+from qtip.base import error
+from qtip.loader import plan
+
 
 def list_plans():
-    return connexion.problem(httplib.NOT_IMPLEMENTED,
-                             'List plans',
-                             'Plans listing not implemented')
+    plan_list = list(plan.Plan.list_all())
+    return plan_list, httplib.OK
 
 
 def get_plan(name):
-    return connexion.problem(httplib.NOT_IMPLEMENTED,
-                             'Get a plan',
-                             'Plan retrieval not implemented')
+    try:
+        plan_spec = plan.Plan(name)
+        return {'name': plan_spec.name,
+                'abspath': plan_spec.abspath,
+                'content': plan_spec.content}, httplib.OK
+    except error.NotFoundError:
+        return connexion.problem(httplib.NOT_FOUND,
+                                 'Plan Not Found',
+                                 'requested plan `' + name + '` not found.')
 
 
 def run_plan(name, action="run"):
diff --git a/qtip/api/controllers/qpi.py b/qtip/api/controllers/qpi.py
index 0b5c5b09..3c4dd718 100644
--- a/qtip/api/controllers/qpi.py
+++ b/qtip/api/controllers/qpi.py
@@ -7,17 +7,26 @@
 # http://www.apache.org/licenses/LICENSE-2.0
 ##############################################################################
 
-import connexion
 import httplib
 
+import connexion
+
+from qtip.base import error
+from qtip.loader import qpi
+
 
 def list_qpis():
-    return connexion.problem(httplib.NOT_IMPLEMENTED,
-                             'List QPIs',
-                             'QPIs listing not implemented')
+    qpi_spec_list = list(qpi.QPISpec.list_all())
+    return qpi_spec_list, httplib.OK
 
 
 def get_qpi(name):
-    return connexion.problem(httplib.NOT_IMPLEMENTED,
-                             'Get a QPI',
-                             'QPI retrieval not implemented')
+    try:
+        qpi_spec = qpi.QPISpec(name)
+        return {'name': qpi_spec.name,
+                'abspath': qpi_spec.abspath,
+                'content': qpi_spec.content}, httplib.OK
+    except error.NotFoundError:
+        return connexion.problem(httplib.NOT_FOUND,
+                                 'QPI Not Found',
+                                 'Requested QPI Spec `' + name + '` not found.')