def createAutostack(self, stackSpec):
""" Create an "autostack"
:param stackSpec: specification for an Autostack
:type stackSpec: dict
::
{
"name": "all_web_servers", # Autostack name
"aggSpec": { # aggregation spec
"datasource": "cloudwatch",
"region": "us-west-2",
"resourceType": "AWS::EC2::Instance"
"filters": { # resourceType-specific filter
"tag:Name":["*test*", "*htm-it*"], "tag:Description":["Blah", "foo"]
},
}
}
:returns: "autostack"
"""
if "name" not in stackSpec or stackSpec["name"].strip() == "":
raise ValueError("Must provide a valid name for the Autostack.")
aggSpec = stackSpec["aggSpec"]
filters = aggSpec["filters"]
self._validateFilters(filters)
region = aggSpec["region"]
# Enforce the instances per AutoStack limit
adapter = htm-it.app.adapters.datasource.createDatasourceAdapter(
aggSpec["datasource"])
instances = adapter.getMatchingResources(aggSpec)
if len(instances) > MAX_INSTANCES_PER_AUTOSTACK:
raise htm-it.app.exceptions.TooManyInstancesError(
"The filters specified match %i instances but the limit per "
"AutoStack is %i." % (len(instances), MAX_INSTANCES_PER_AUTOSTACK))
name = stackSpec["name"]
with self.connectionFactory() as conn:
autostackDict = repository.addAutostack(
conn,
name=name,
region=region,
filters=htmengine.utils.jsonEncode(filters))
autostackObj = repository.getAutostack(conn, autostackDict["uid"])
return autostackObj
def POST(self, autostackId, data=None): # pylint: disable=C0103,R0201
"""
Create one or more Autostack Metric(s)
::
POST /_autostacks/{autostackId}/metrics
[
{
"namespace": "AWS/EC2",
"metric": "CPUUtilization"
},
...
]
Request body is a list of items, each of which are a subset of the
standard cloudwatch native metric, specifying only:
:param namespace: AWS Namespace
:type namespace: str
:param metric: AWS Metric name
:type str:
`datasource`, `region`, and `dimensions` normally required when creating
models are not necessary.
"""
try:
self.addStandardHeaders()
with web.ctx.connFactory() as conn:
autostackRow = repository.getAutostack(conn,
autostackId)
data = data or utils.jsonDecode(web.data())
for nativeMetric in data:
try:
if nativeMetric["namespace"] == "Autostacks":
slaveDatasource = "autostack"
else:
slaveDatasource = "cloudwatch" # only support cloudwatch for now
modelParams = {}
if "min" and "max" in nativeMetric:
modelParams["min"] = nativeMetric["min"]
modelParams["max"] = nativeMetric["max"]
modelSpec = {
"datasource": "autostack",
"metricSpec": {
"autostackId": autostackRow.uid,
"slaveDatasource": slaveDatasource,
"slaveMetric": nativeMetric
},
"modelParams": modelParams
}
metricId = (createAutostackDatasourceAdapter()
.monitorMetric(modelSpec))
with web.ctx.connFactory() as conn:
metricRow = repository.getMetric(conn, metricId)
metricDict = convertMetricRowToMetricDict(metricRow)
except KeyError:
raise web.badrequest("Missing details in request")
except ValueError:
response = {"result": "failure"}
raise web.badrequest(utils.jsonEncode(response))
response = {"result": "success", "metric": metricDict}
raise web.created(utils.jsonEncode(response))
except ObjectNotFoundError:
raise web.notfound("Autostack not found: Autostack ID: %s" % autostackId)
except (web.HTTPError) as ex:
if bool(re.match(r"([45][0-9][0-9])\s?", web.ctx.status)):
# Log 400-599 status codes as errors, ignoring 200-399
log.error(str(ex) or repr(ex))
raise
except Exception as ex:
log.exception("POST Failed")
raise web.internalerror(str(ex) or repr(ex))
def GET(self, autostackId=None): # pylint: disable=C0103
"""
Get instances for known Autostack:
::
GET /_autostacks/{autostackId}/instances
Preview Autostack instances:
::
GET /_autostacks/preview_instances?region={region}&filters={filters}
:param region: AWS Region Name
:type region: str
:param filters: AWS Tag value pattern
:type value: str (JSON object)
Example query params:
::
region=us-west-2&filters={"tag:Name":["jenkins-master"]}
:return: List of instance details. See
AutostackInstancesHandler.formatInstance() for implementation.
Example return value:
::
[
{
"instanceID": "i-12345678",
"state": "stopped",
"regionName": "us-west-2",
"instanceType": "m1.medium",
"launchTime": "2013-09-24T02:02:48Z",
"tags": {
"Type": "Jenkins",
"Description": "Jenkins Master",
"Name": "jenkins-master"
}
},
{
"instanceID": "i-12345678",
"state": "running",
"regionName": "us-west-2",
"instanceType": "m1.large",
"launchTime": "2013-12-19T12:02:31Z",
"tags": {
"Type": "Jenkins",
"Name": "jenkins-master",
"Description": "Jenkin Master(Python 2.7)"
}
}
]
"""
self.addStandardHeaders()
aggSpec = {
"datasource": "cloudwatch", # only support EC2 for now
"region": None, # to be filled below
"resourceType": "AWS::EC2::Instance", # only support EC2 for now
"filters": None # to be filled below
}
adapter = createCloudwatchDatasourceAdapter()
if autostackId is not None:
try:
with web.ctx.connFactory() as conn:
autostackRow = repository.getAutostack(conn, autostackId)
except ObjectNotFoundError:
raise web.notfound("Autostack not found: Autostack ID: %s"
% autostackId)
except web.HTTPError as ex:
if bool(re.match(r"([45][0-9][0-9])\s?", web.ctx.status)):
# Log 400-599 status codes as errors, ignoring 200-399
log.error(str(ex) or repr(ex))
raise
except Exception as ex:
raise web.internalerror(str(ex) or repr(ex))
aggSpec["region"] = autostackRow.region
aggSpec["filters"] = autostackRow.filters
result = adapter.getMatchingResources(aggSpec)
else:
data = web.input(region=None, filters=None)
if not data.region:
raise InvalidRequestResponse({"result":"Invalid region"})
if not data.filters:
raise InvalidRequestResponse({"result":"Invalid filters"})
try:
aggSpec["region"] = data.region
aggSpec["filters"] = utils.jsonDecode(data.filters)
result = adapter.getMatchingResources(aggSpec)
except boto.exception.EC2ResponseError as responseError:
raise InvalidRequestResponse({"result": responseError.message})
if result:
return utils.jsonEncode([self.formatInstance(instance)
for instance in result])
return utils.jsonEncode([])
def monitorMetric(self, modelSpec):
""" Start monitoring a metric; create a model linked to an existing
Autostack
:param modelSpec: model specification for an Autostack-based model
:type modelSpec: dict
::
{
"datasource": "autostack",
"metricSpec": {
# TODO [MER-3533]: This should be autostack name instead
"autostackId": "a858c6990a444cd8a07466ec7f3cae16",
"slaveDatasource": "cloudwatch",
"slaveMetric": {
# specific to slaveDatasource
"namespace": "AWS/EC2",
"metric": "CPUUtilization"
},
"period": 300 # aggregation period; seconds
},
"modelParams": { # optional; specific to slave metric
"min": 0, # optional
"max": 100 # optional
}
}
:returns: datasource-specific unique model identifier
:raises htm-it.app.exceptions.ObjectNotFoundError: if referenced autostack
doesn't exist
:raises htm-it.app.exceptions.MetricNotSupportedError: if requested metric
isn't supported
:raises htm-it.app.exceptions.MetricAlreadyMonitored: if the metric is already
being monitored
"""
metricSpec = modelSpec["metricSpec"]
autostackId = metricSpec["autostackId"]
with self.connectionFactory() as conn:
autostack = repository.getAutostack(conn, autostackId)
slaveDatasource = metricSpec["slaveDatasource"]
slaveMetric = metricSpec["slaveMetric"]
canonicalResourceName = self.getInstanceNameForModelSpec(modelSpec)
metricAdapter = AutostackMetricAdapterBase.getMetricAdapter(slaveDatasource)
nameColumnValue = metricAdapter.getMetricName(slaveMetric)
metricDescription = metricAdapter.getMetricDescription(slaveMetric,
autostack)
queryParams = metricAdapter.getQueryParams(nameColumnValue)
defaultMin = queryParams["min"]
defaultMax = queryParams["max"]
defaultPeriod = queryParams["period"]
modelParams = modelSpec.get("modelParams", dict())
explicitMin = modelParams.get("min")
explicitMax = modelParams.get("max")
explicitPeriod = metricSpec.get("period")
if (explicitMin is None) != (explicitMax is None):
raise ValueError(
"min and max params must both be None or non-None; modelSpec=%r"
% (modelSpec,))
minVal = explicitMin if explicitMin is not None else defaultMin
maxVal = explicitMax if explicitMax is not None else defaultMax
period = explicitPeriod if explicitPeriod is not None else defaultPeriod
stats = {"min": minVal, "max": maxVal}
if minVal is None or maxVal is None:
raise ValueError("Expected min and max to be set")
swarmParams = scalar_metric_utils.generateSwarmParams(stats)
@repository.retryOnTransientErrors
def startMonitoringWithRetries():
"""
:returns: metricId
"""
with self.connectionFactory() as conn:
with conn.begin():
repository.lockOperationExclusive(conn,
repository.OperationLock.METRICS)
# Check if the metric is already monitored
matchingMetrics = repository.getAutostackMetricsWithMetricName(
conn,
autostackId,
nameColumnValue,
fields=[schema.metric.c.uid])
matchingMetric = next(iter(matchingMetrics), None)
if matchingMetric:
msg = ("monitorMetric: Autostack modelId=%s is already "
"monitoring metric=%s on resource=%s; model=%r"
% (matchingMetric.uid, nameColumnValue,
canonicalResourceName, matchingMetric))
self._log.warning(msg)
raise htm-it.app.exceptions.MetricAlreadyMonitored(
msg,
uid=matchingMetric.uid)
# Add a metric row for the requested metric
metricDict = repository.addMetric(
conn,
datasource=self._DATASOURCE,
name=nameColumnValue,
description=metricDescription,
server=canonicalResourceName,
location=autostack.region,
tag_name=autostack.name,
parameters=htmengine.utils.jsonEncode(modelSpec),
poll_interval=period,
status=MetricStatus.UNMONITORED)
metricId = metricDict["uid"]
repository.addMetricToAutostack(conn, autostackId, metricId)
# Start monitoring
scalar_metric_utils.startMonitoring(
conn=conn,
metricId=metricId,
swarmParams=swarmParams,
logger=self._log)
self._log.info("monitorMetric: monitoring metric=%s, stats=%r",
metricId, stats)
return metricId
return startMonitoringWithRetries()