Clean up fencing handler

1. Remove all format strings in favour of f-strings
2. Ensure all logger messages have a prefix
3. Add a few more logger messages for clarity

node-daemon/pvcnoded/util/fencing.py

@@ -42,20 +42,24 @@ def fence_node(node_name, zkhandler, config, logger):
         if node_daemon_state == "dead":
             failcount += 1
             logger.out(
-                'Node "{}" failed {}/{} saving throws'.format(
+                f"Node {node_name} failed {failcount}/{failcount_limit} saving throws",
-                    node_name, failcount, failcount_limit
-                ),
                 state="s",
+                prefix=f"fencing {node_name}",
             )
         # It changed back to something else so it must be alive
         else:
             logger.out(
-                'Node "{}" passed a saving throw; canceling fence'.format(node_name),
+                f"Node {node_name} passed a saving throw; cancelling fance",
                 state="o",
+                prefix=f"fencing {node_name}",
             )
             return
 
-    logger.out('Fencing node "{}" via IPMI reboot signal'.format(node_name), state="s")
+    logger.out(
+        f"Fencing node {node_name} via IPMI reboot signal",
+        state="s",
+        prefix=f"fencing {node_name}",
+    )
 
     # Get IPMI information
     ipmi_hostname = zkhandler.read(("node.ipmi.hostname", node_name))
@@ -63,19 +67,24 @@ def fence_node(node_name, zkhandler, config, logger):
     ipmi_password = zkhandler.read(("node.ipmi.password", node_name))
 
     # Shoot it in the head
-    fence_status = reboot_via_ipmi(ipmi_hostname, ipmi_username, ipmi_password, logger)
+    fence_status = reboot_via_ipmi(
+        node_name, ipmi_hostname, ipmi_username, ipmi_password, logger
+    )
 
     # Hold to ensure the fence takes effect and system stabilizes
     logger.out(
-        'Waiting {}s for fence of node "{}" to take effect'.format(
+        f"Waiting {config['keepalive_interval']}s for fence of node {node_name} to take effect",
-            config["keepalive_interval"], node_name
-        ),
         state="i",
+        prefix=f"fencing {node_name}",
     )
     time.sleep(config["keepalive_interval"])
 
     if fence_status:
-        logger.out('Marking node "{}" as fenced'.format(node_name), state="i")
+        logger.out(
+            f"Marking node {node_name} as fenced",
+            state="i",
+            prefix=f"fencing {node_name}",
+        )
         while True:
             try:
                 zkhandler.write([(("node.state.daemon", node_name), "fenced")])
@@ -86,7 +95,9 @@ def fence_node(node_name, zkhandler, config, logger):
     # Force into secondary network state if needed
     if node_name in config["coordinators"]:
         logger.out(
-            'Forcing secondary status for node "{}"'.format(node_name), state="i"
+            f"Forcing secondary coordinator state for node {node_name}",
+            state="i",
+            prefix=f"fencing {node_name}",
         )
         zkhandler.write([(("node.state.router", node_name), "secondary")])
         if zkhandler.read("base.config.primary_node") == node_name:
@@ -108,7 +119,9 @@ def fence_node(node_name, zkhandler, config, logger):
 # Migrate hosts away from a fenced node
 def migrateFromFencedNode(zkhandler, node_name, config, logger):
     logger.out(
-        'Migrating VMs from dead node "{}" to new hosts'.format(node_name), state="i"
+        f"Migrating VMs from dead node {node_name} to new hosts",
+        state="i",
+        prefix=f"fencing {node_name}",
     )
 
     # Get the list of VMs
@@ -121,14 +134,20 @@ def migrateFromFencedNode(zkhandler, node_name, config, logger):
 
     # Migrate a VM after a flush
     def fence_migrate_vm(dom_uuid):
+        logger.out(
+            f"Flushing locks of VM {dom_uuid} due to fence",
+            state="i",
+            prefix=f"fencing {node_name}",
+        )
         vm_worker_flush_locks(zkhandler, None, dom_uuid, force_unlock=True)
 
         target_node = common.findTargetNode(zkhandler, dom_uuid)
 
         if target_node is not None:
             logger.out(
-                'Migrating VM "{}" to node "{}"'.format(dom_uuid, target_node),
+                f"Migrating VM {dom_uuid} to node {target_node}",
                 state="i",
+                prefix=f"fencing {node_name}",
             )
             zkhandler.write(
                 [
@@ -137,12 +156,16 @@ def migrateFromFencedNode(zkhandler, node_name, config, logger):
                     (("domain.last_node", dom_uuid), node_name),
                 ]
             )
+            logger.out(
+                f"Successfully migrated running VM {dom_uuid} to node {target_node}",
+                state="o",
+                prefix=f"fencing {node_name}",
+            )
         else:
             logger.out(
-                'No target node found for VM "{}"; VM will autostart on next unflush/ready of current node'.format(
+                f"No target node found for VM {dom_uuid}; marking autostart=True on current node",
-                    dom_uuid
-                ),
                 state="i",
+                prefix=f"fencing {node_name}",
             )
             zkhandler.write(
                 {
@@ -150,6 +173,11 @@ def migrateFromFencedNode(zkhandler, node_name, config, logger):
                     (("domain.meta.autostart", dom_uuid), "True"),
                 }
             )
+            logger.out(
+                f"Successfully marked autostart for running VM {dom_uuid} on current node",
+                state="o",
+                prefix=f"fencing {node_name}",
+            )
 
     # Loop through the VMs
     for dom_uuid in dead_node_running_domains:
@@ -159,113 +187,141 @@ def migrateFromFencedNode(zkhandler, node_name, config, logger):
             logger.out(
                 f"Failed to migrate VM {dom_uuid}, continuing: {e}",
                 state="w",
+                prefix=f"fencing {node_name}",
             )
 
     # Set node in flushed state for easy remigrating when it comes back
     zkhandler.write([(("node.state.domain", node_name), "flushed")])
     logger.out(
-        'All VMs flushed from dead node "{}" to new hosts'.format(node_name), state="i"
+        f"All VMs flushed from dead node {node_name} to other nodes",
+        state="i",
+        prefix=f"fencing {node_name}",
     )
 
 
 #
 # Perform an IPMI fence
 #
-def reboot_via_ipmi(ipmi_hostname, ipmi_user, ipmi_password, logger):
+def reboot_via_ipmi(node_name, ipmi_hostname, ipmi_user, ipmi_password, logger):
     # Power off the node the node
-    logger.out("Sending power off to dead node", state="i")
+    logger.out(
-    ipmi_command_stop = (
+        "Sending power off to dead node",
-        "/usr/bin/ipmitool -I lanplus -H {} -U {} -P {} chassis power off".format(
+        state="i",
-            ipmi_hostname, ipmi_user, ipmi_password
+        prefix=f"fencing {node_name}",
-        )
     )
     ipmi_stop_retcode, ipmi_stop_stdout, ipmi_stop_stderr = common.run_os_command(
-        ipmi_command_stop
+        f"/usr/bin/ipmitool -I lanplus -H {ipmi_hostname} -U {ipmi_user} -P {ipmi_password} chassis power off"
+    )
+    if ipmi_stop_retcode != 0:
+        logger.out(
+            f"Failed to power off dead node: {ipmi_stop_stderr}",
+            state="e",
+            prefix=f"fencing {node_name}",
         )
 
-    if ipmi_stop_retcode != 0:
+    logger.out(
-        logger.out(f"Failed to power off dead node: {ipmi_stop_stderr}", state="e")
+        "Waiting 5s for power off to take effect",
-
+        state="i",
+        prefix=f"fencing {node_name}",
+    )
     time.sleep(5)
 
     # Check the chassis power state
-    logger.out("Checking power state of dead node", state="i")
+    logger.out(
-    ipmi_command_status = (
+        "Checking power state of dead node",
-        "/usr/bin/ipmitool -I lanplus -H {} -U {} -P {} chassis power status".format(
+        state="i",
-            ipmi_hostname, ipmi_user, ipmi_password
+        prefix=f"fencing {node_name}",
-        )
     )
     ipmi_status_retcode, ipmi_status_stdout, ipmi_status_stderr = common.run_os_command(
-        ipmi_command_status
+        f"/usr/bin/ipmitool -I lanplus -H {ipmi_hostname} -U {ipmi_user} -P {ipmi_password} chassis power status"
     )
     if ipmi_status_retcode == 0:
         logger.out(
-            f"Current chassis power state is: {ipmi_status_stdout.strip()}", state="i"
+            f"Current chassis power state is: {ipmi_status_stdout.strip()}",
+            state="i",
+            prefix=f"fencing {node_name}",
         )
     else:
-        logger.out("Current chassis power state is: Unknown", state="w")
+        logger.out(
+            "Current chassis power state is: Unknown",
+            state="w",
+            prefix=f"fencing {node_name}",
+        )
 
     # Power on the node
-    logger.out("Sending power on to dead node", state="i")
+    logger.out(
-    ipmi_command_start = (
+        "Sending power on to dead node",
-        "/usr/bin/ipmitool -I lanplus -H {} -U {} -P {} chassis power on".format(
+        state="i",
-            ipmi_hostname, ipmi_user, ipmi_password
+        prefix=f"fencing {node_name}",
-        )
     )
     ipmi_start_retcode, ipmi_start_stdout, ipmi_start_stderr = common.run_os_command(
-        ipmi_command_start
+        f"/usr/bin/ipmitool -I lanplus -H {ipmi_hostname} -U {ipmi_user} -P {ipmi_password} chassis power on"
     )
 
     if ipmi_start_retcode != 0:
-        logger.out(f"Failed to power on dead node: {ipmi_start_stderr}", state="w")
+        logger.out(
+            f"Failed to power on dead node: {ipmi_start_stderr}",
+            state="w",
+            prefix=f"fencing {node_name}",
+        )
 
+    logger.out(
+        "Waiting 2s for power on to take effect",
+        state="i",
+        prefix=f"fencing {node_name}",
+    )
     time.sleep(2)
 
     # Check the chassis power state
-    logger.out("Checking power state of dead node", state="i")
+    logger.out(
-    ipmi_command_status = (
+        "Checking power state of dead node",
-        "/usr/bin/ipmitool -I lanplus -H {} -U {} -P {} chassis power status".format(
+        state="i",
-            ipmi_hostname, ipmi_user, ipmi_password
+        prefix=f"fencing {node_name}",
-        )
     )
     ipmi_status_retcode, ipmi_status_stdout, ipmi_status_stderr = common.run_os_command(
-        ipmi_command_status
+        f"/usr/bin/ipmitool -I lanplus -H {ipmi_hostname} -U {ipmi_user} -P {ipmi_password} chassis power status"
     )
 
     if ipmi_stop_retcode == 0:
         if ipmi_status_stdout.strip() == "Chassis Power is on":
             # We successfully rebooted the node and it is powered on; this is a succeessful fence
-            logger.out("Successfully rebooted dead node", state="o")
+            logger.out(
+                "Successfully rebooted dead node; proceeding with fence recovery action",
+                state="o",
+                prefix=f"fencing {node_name}",
+            )
             return True
         elif ipmi_status_stdout.strip() == "Chassis Power is off":
             # We successfully rebooted the node but it is powered off; this might be expected or not, but the node is confirmed off so we can call it a successful fence
             logger.out(
-                "Chassis power is in confirmed off state after successfuly IPMI reboot; proceeding with fence-flush",
+                "Chassis power is in confirmed off state after successfuly IPMI reboot; proceeding with fence recovery action",
                 state="o",
+                prefix=f"fencing {node_name}",
             )
             return True
         else:
             # We successfully rebooted the node but it is in some unknown power state; since this might indicate a silent failure, we must call it a failed fence
             logger.out(
-                "Chassis power is in an unknown state ({}) after successful IPMI reboot; not performing fence-flush".format(
+                f"Chassis power is in an unknown state ({ipmi_status_stdout.strip()}) after successful IPMI reboot; NOT proceeding fence recovery action",
-                    ipmi_status_stdout.strip()
-                ),
                 state="e",
+                prefix=f"fencing {node_name}",
             )
             return False
     else:
         if ipmi_status_stdout.strip() == "Chassis Power is off":
             # We failed to reboot the node but it is powered off; it has probably suffered a serious hardware failure, but the node is confirmed off so we can call it a successful fence
             logger.out(
-                "Chassis power is in confirmed off state after failed IPMI reboot; proceeding with fence-flush",
+                "Chassis power is in confirmed off state after failed IPMI reboot; proceeding with fence recovery action",
                 state="o",
+                prefix=f"fencing {node_name}",
             )
             return True
         else:
             # We failed to reboot the node but it is in some unknown power state (including "on"); since this might indicate a silent failure, we must call it a failed fence
             logger.out(
-                "Chassis power is not in confirmed off state after failed IPMI reboot; not performing fence-flush",
+                "Chassis power is not in confirmed off state after failed IPMI reboot; NOT proceeding wiht fence recovery action",
                 state="e",
+                prefix=f"fencing {node_name}",
             )
             return False