def POST(self, region, namespace, instanceId=None):
"""
Monitor a set of default metrics for a specific instance
::
POST /_instances/{region}/{namespace}/{instanceId}
Returns:
::
{
"result": "success"
}
OR
Monitor a set of default metrics for multiple specific instances
::
POST /_instances/{region}/{namespace}
POST data:
::
[
{instanceId},
...
]
Returns:
::
{
"result": "success"
}
Note:
We expect a 200 OK even when attempting to POST to an instanece in the wrong
namespace or the wrong region, this saves the overhead of asking AWS if
we're dealing with a valid instance in the given namespace or region
with every POST request.
We expect the CLI user to know the correct instance ID.
"""
if instanceId is None:
try:
dimension = None
instances = json.loads(web.data())
except:
raise InvalidRequestResponse({"result": "Invalid request"})
else:
(dimension, _, identifier) = instanceId.rpartition("/")
instances = [identifier]
# Check for invalid region or namespace
cwAdapter = datasource.createDatasourceAdapter("cloudwatch")
supportedRegions = set(region for region, _desc in
cwAdapter.describeRegions())
if region not in supportedRegions:
raise InvalidRequestResponse({"result": ("Not supported. Region '%s' was"
" not found.") % region})
supportedNamespaces = set()
for resourceInfo in cwAdapter.describeSupportedMetrics().values():
for metricInfo in resourceInfo.values():
supportedNamespaces.add(metricInfo["namespace"])
if namespace not in supportedNamespaces:
raise InvalidRequestResponse({"result": ("Not supported. Namespace '%s' "
"was not found.") % namespace})
try:
# Attempt to validate instances list using validictory
validate(instances, _INSTANCES_MODEL_CREATION_SCHEMA)
except ValidationError as e:
response = "InvalidArgumentsError: " + str(e)
raise InvalidRequestResponse({"result": response})
if instances:
for instanceId in instances:
server = "/".join([region, namespace, instanceId])
with web.ctx.connFactory() as conn:
numMetrics = repository.getMetricCountForServer(conn, server)
if numMetrics > 0:
# Metrics exist for instance id.
pass
else:
try:
resourceType = cloudwatch.NAMESPACE_TO_RESOURCE_TYPE[namespace]
except KeyError:
raise InvalidRequestResponse({"result": "Not supported."})
modelSpecs = cwAdapter.getDefaultModelSpecs(
resourceType, region, instanceId, dimension)
for modelSpec in modelSpecs:
ModelHandler.createModel(modelSpec)
self.addStandardHeaders()
return encodeJson({"result": "success"})
