Prometheus rule file syntax test

This is improvement of functional test of
prometheus plugin. By this fix, the created
prometheus rule files are checked by promtool.
If the syntax of them are invalid, the test fails.

This check is disabled by default and enabled when
CONF.prometheus_plugin.test_rule_with_promtool
is true.

Implements: blueprint support-auto-lcm
Change-Id: Ica331befe225156c607d5c8267462b7281669c91

.zuul.yaml

@@ -586,9 +586,10 @@
               v2_vnfm:
                 kubernetes_vim_rsc_wait_timeout: 800
               prometheus_plugin:
-                fault_management: True
-                performance_management: True
-                auto_scaling: True
+                fault_management: true
+                performance_management: true
+                auto_scaling: true
+                test_rule_with_promtool: true
         tox_envlist: dsvm-functional-sol-kubernetes-v2
     vars:
       prometheus_setup: true

doc/source/user/prometheus_plugin_use_case_guide.rst

@@ -52,6 +52,9 @@ performance_management, fault_management or auto_scaling below.
   * - ``CONF.prometheus_plugin.auto_scaling``
     - false
     - Enable prometheus plugin autoscaling.
+  * - ``CONF.prometheus_plugin.test_rule_with_promtool``
+    - false
+    - Enable rule file validation using promtool.
 
 System
 ~~~~~~
@@ -241,6 +244,14 @@ needs to activate sshd.
 - The directory indicated by "rule_files" setting of prometheus
   server config should be accessible by SSH.
 
+Supported versions
+------------------
+
+Tacker Zed release
+
+- Prometheus: 2.37
+- Alertmanager: 0.24
+
 Alert rule registration
 ~~~~~~~~~~~~~~~~~~~~~~~
 

tacker/sol_refactored/common/config.py

@@ -161,6 +161,9 @@ PROMETHEUS_PLUGIN_OPTS = [
                       'This configuration is changed in case of replacing '
                       'the original function with a vendor specific '
                       'function.')),
+    cfg.BoolOpt('test_rule_with_promtool',
+                default=False,
+                help=_('Enable rule file validation using promtool.')),
 ]
 
 CONF.register_opts(PROMETHEUS_PLUGIN_OPTS, 'prometheus_plugin')

tacker/sol_refactored/common/prometheus_plugin.py

@@ -21,6 +21,7 @@ import paramiko
 import re
 import tempfile
 
+from keystoneauth1 import exceptions as ks_exc
 from oslo_log import log as logging
 from oslo_utils import uuidutils
 from tacker.sol_refactored.api import prometheus_plugin_validator as validator
@@ -37,6 +38,7 @@ from tacker.sol_refactored import objects
 
 
 LOG = logging.getLogger(__name__)
+logging.getLogger("paramiko").setLevel(logging.WARNING)
 
 CONF = cfg.CONF
 
@@ -510,12 +512,23 @@ class PrometheusPluginPm(PrometheusPlugin, mon_base.MonitoringPlugin):
 
     def delete_rules(self, context, pm_job):
         target_list, reload_list = self.get_access_info(pm_job)
-        for info in target_list:
-            self._delete_rule(
-                info['host'], info['port'], info['user'],
-                info['password'], info['path'], pm_job.id)
+        for target in target_list:
+            try:
+                self._delete_rule(
+                    target['host'], target['port'], target['user'],
+                    target['password'], target['path'], pm_job.id)
+            except (sol_ex.PrometheusPluginError, ks_exc.ClientException,
+                    paramiko.SSHException):
+                # This exception is ignored. DELETE /pm_jobs/{id}
+                # will be success even if _delete_rule() is failed.
+                # Because the rule file was already deleted.
+                pass
         for uri in reload_list:
-            self.reload_prom_server(context, uri)
+            try:
+                self.reload_prom_server(context, uri)
+            except (sol_ex.PrometheusPluginError, ks_exc.ClientException,
+                    paramiko.SSHException):
+                pass
 
     def decompose_metrics(self, pm_job):
         if pm_job.objectType in {'Vnf', 'Vnfc'}:
@@ -528,9 +541,10 @@ class PrometheusPluginPm(PrometheusPlugin, mon_base.MonitoringPlugin):
     def reload_prom_server(self, context, reload_uri):
         resp, _ = self.client.do_request(
             reload_uri, "PUT", context=context)
-        if resp.status_code != 202:
-            LOG.error("reloading request to prometheus is failed: %d.",
-                      resp.status_code)
+        if resp.status_code >= 400 and resp.status_code < 600:
+            raise sol_ex.PrometheusPluginError(
+                f"Reloading request to prometheus is failed: "
+                f"{resp.status_code}.")
 
     def _upload_rule(self, rule_group, host, port, user, password, path,
                      pm_job_id):
@@ -544,6 +558,25 @@ class PrometheusPluginPm(PrometheusPlugin, mon_base.MonitoringPlugin):
                 client.connect(username=user, password=password)
                 sftp = paramiko.SFTPClient.from_transport(client)
                 sftp.put(filename, f'{path}/{pm_job_id}.json')
+        self.verify_rule(host, port, user, password, path, pm_job_id)
+
+    def verify_rule(self, host, port, user, password, path, pm_job_id):
+        if not CONF.prometheus_plugin.test_rule_with_promtool:
+            return
+        with paramiko.SSHClient() as client:
+            client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
+            client.connect(host, port=port, username=user, password=password)
+            command = f"promtool check rules {path}/{pm_job_id}.json"
+            LOG.info("Rule file validation command: %s", command)
+            _, stdout, stderr = client.exec_command(command)
+            if stdout.channel.recv_exit_status() != 0:
+                error_byte = stderr.read()
+                error_str = error_byte.decode('utf-8')
+                LOG.error(
+                    "Rule file validation with promtool failed: %s",
+                    error_str)
+                raise sol_ex.PrometheusPluginError(
+                    "Rule file validation with promtool failed.")
 
     def get_access_info(self, pm_job):
         target_list = []
@@ -579,12 +612,32 @@ class PrometheusPluginPm(PrometheusPlugin, mon_base.MonitoringPlugin):
 
     def upload_rules(
             self, context, target_list, reload_list, rule_group, pm_job):
-        for info in target_list:
-            self._upload_rule(
-                rule_group, info['host'], info['port'], info['user'],
-                info['password'], info['path'], pm_job.id)
-        for uri in reload_list:
-            self.reload_prom_server(context, uri)
+        def _cleanup_error(target_list):
+            for target in target_list:
+                try:
+                    self._delete_rule(target['host'], target['port'],
+                        target['user'], target['password'], target['path'],
+                        pm_job.id)
+                except (sol_ex.PrometheusPluginError, ks_exc.ClientException,
+                        paramiko.SSHException):
+                    pass
+
+        try:
+            for target in target_list:
+                self._upload_rule(
+                    rule_group, target['host'], target['port'],
+                    target['user'], target['password'], target['path'],
+                    pm_job.id)
+            for uri in reload_list:
+                self.reload_prom_server(context, uri)
+        except (sol_ex.PrometheusPluginError, ks_exc.ClientException,
+                paramiko.SSHException) as e:
+            LOG.error("failed to upload rule files: %s", e.args[0])
+            _cleanup_error(target_list)
+            raise e
+        except Exception as e:
+            _cleanup_error(target_list)
+            raise e
 
     def get_vnf_instances(self, context, pm_job):
         object_instance_ids = list(set(pm_job.objectInstanceIds))

tacker/sol_refactored/conductor/prometheus_plugin_driver.py

@@ -60,4 +60,4 @@ class PrometheusPluginDriver():
         url = f'{ep}/vnflcm/v2/vnf_instances/{vnf_instance_id}/scale'
         resp, _ = self.client.do_request(
             url, "POST", context=context, body=scale_req, version="2.0.0")
-        LOG.info("AutoHealing request is processed: %d.", resp.status_code)
+        LOG.info("AutoScaling request is processed: %d.", resp.status_code)

tacker/sol_refactored/controller/vnfpm_v2.py

@@ -199,6 +199,7 @@ class VnfPmControllerV2(sol_wsgi.SolAPIController):
         try:
             self.plugin.create_job(context=context, pm_job=pm_job)
         except sol_ex.PrometheusPluginError as e:
+            LOG.error("Failed to create PM job: %s", e.args[0])
             raise sol_ex.PrometheusSettingFailed from e
 
         pm_job.create(context)