Add Zookeeper schema manager to zkhandler
Adds a new class, ZKSchema, to handle schema management in Zookeeper in an automated and consistent way. This should solve several issues: 1. Pain in managing changes to ZK keys 2. Pain in handling those changes during live upgrades 3. Simplifying the codebase to remove hardcoded ZK paths The current master schema for PVC 0.9.19 is committed as version 0. Addresses #129
This commit is contained in:
parent
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commit
126f0742cd
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@ -0,0 +1 @@
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{"version": "0", "root": "", "base": {"schema": "/schema", "schema.version": "/schema/version", "config": "/config", "config.maintenance": "/config/maintenance", "config.primary_node": "/config/primary_node", "config.upstream_ip": "/config/upstream_ip", "config.migration_target_selector": "/config/migration_target_selector", "lock": "/locks", "lock.primary_node": "/locks/primary_node", "lock.flush_lock": "/locks/flush_lock", "lock.domain_migrate": "/locks/domain_migrate", "cmd": "/cmd", "cmd.nodes": "/cmd/nodes", "cmd.domains": "/cmd/domains", "cmd.ceph": "/cmd/ceph", "node": "/nodes", "domain": "/domains", "network": "/networks", "storage": "/ceph", "storage.util": "/ceph/util", "osd": "/ceph/osds", "pool": "/ceph/pools", "volume": "/ceph/volumes", "snapshot": "/ceph/snapshots"}, "node": {"keepalive": "/keepalive", "mode": "/daemonmode", "staticdata": "/static_data", "data.kernel": "/oskernelversion", "data.os": "/ostype", "data.arch": "/osarch", "counts.provisioned_domains": "/domainscount", "counts.running_domains": "/runningdomains", "counts.networks": "/networkscount", "state.daemon": "/daemonstate", "state.router": "/routerstate", "state.domain": "/domainstate", "vcpu.total": "/vcputotal", "vcpu.allocated": "/vcpualloc", "memory.total": "/memtotal", "memory.used": "/memused", "memory.free": "/memfree", "memory.allocated": "/memalloc", "memory.provisioned": "/memprov", "ipmi.hostname": "/ipmihostname", "ipmi.username": "/ipmiusername", "ipmi.password": "/ipmipassword"}, "domain": {"name": "", "xml": "/xml", "state": "/state", "profile": "/profile", "stats": "/stats", "node": "/node", "last_node": "/lastnode", "failed_reason": "/failedreason", "console.log": "/consolelog", "console.vnc": "/vnc", "meta.autostart": "/node_autostart", "meta.migrate_method": "/migration_method", "meta.node_selector": "/node_selector", "meta.node_limit": "/node_limit"}, "network": {"type": "/nettype", "rules": "/firewall_rules", "nameservers": "/name_servers", "domain": "/domain", "ip4.gateway": "/ip4_gateway", "ip4.network": "/ip4_network", "ip4.dhcp": "/dhcp4_flag", "ip4.reservations": "/dhcp4_reservations", "ip4.dhcp_start": "/dhcp4_start", "ip4.dhcp_end": "/dhcp4_end", "ip6.gateway": "/ip6_gateway", "ip6.network": "/ip6_network", "ip6.dhcp": "/dhcp6_flag"}, "osd": {"node": "/node", "device": "/device", "stats": "/stats"}, "pool": {"pgs": "/pgs", "stats": "/stats"}, "volume": {"stats": "/stats"}, "snapshot": {"stats": "/stats"}}
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@ -19,10 +19,13 @@
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#
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###############################################################################
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import os
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import time
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import uuid
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import json
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from functools import wraps
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from kazoo.client import KazooClient, KazooState
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from kazoo.exceptions import NoNodeError
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#
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@ -254,7 +257,7 @@ class ZKHandler(object):
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child_destination_key = "{}/{}".format(destination_key, child_key)
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rename_element(transaction, child_source_key, child_destination_key)
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transaction.delete(source_key, recursive=True)
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transaction.delete(source_key)
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for kkpair in (kkpairs):
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if type(kkpair) is not tuple:
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@ -351,3 +354,364 @@ class ZKHandler(object):
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continue
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return lock
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#
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# Schema classes
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#
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class ZKSchema(object):
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# Current version
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_version = 0
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# Root for doing nested keys
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_schema_root = ''
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# Primary schema definition for the current version
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_schema = {
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'version': f'{_version}',
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'root': f'{_schema_root}',
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# Base schema defining core keys; this is all that is initialized on cluster init()
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'base': {
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'schema': f'{_schema_root}/schema',
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'schema.version': f'{_schema_root}/schema/version',
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'config': f'{_schema_root}/config',
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'config.maintenance': f'{_schema_root}/config/maintenance',
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'config.primary_node': f'{_schema_root}/config/primary_node',
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'config.upstream_ip': f'{_schema_root}/config/upstream_ip',
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'config.migration_target_selector': f'{_schema_root}/config/migration_target_selector',
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'lock': f'{_schema_root}/locks',
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'lock.primary_node': f'{_schema_root}/locks/primary_node',
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'lock.flush_lock': f'{_schema_root}/locks/flush_lock',
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'lock.domain_migrate': f'{_schema_root}/locks/domain_migrate',
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'cmd': f'{_schema_root}/cmd',
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'cmd.nodes': f'{_schema_root}/cmd/nodes',
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'cmd.domains': f'{_schema_root}/cmd/domains',
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'cmd.ceph': f'{_schema_root}/cmd/ceph',
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'node': f'{_schema_root}/nodes',
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'domain': f'{_schema_root}/domains',
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'network': f'{_schema_root}/networks',
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'storage': f'{_schema_root}/ceph',
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'storage.util': f'{_schema_root}/ceph/util',
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'osd': f'{_schema_root}/ceph/osds',
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'pool': f'{_schema_root}/ceph/pools',
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'volume': f'{_schema_root}/ceph/volumes',
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'snapshot': f'{_schema_root}/ceph/snapshots',
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},
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# The schema of an individual node entry (/nodes/{node_name})
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'node': {
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'keepalive': '/keepalive',
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'mode': '/daemonmode',
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'staticdata': '/static_data',
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'data.kernel': '/oskernelversion',
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'data.os': '/ostype',
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'data.arch': '/osarch',
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'counts.provisioned_domains': '/domainscount',
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'counts.running_domains': '/runningdomains',
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'counts.networks': '/networkscount',
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'state.daemon': '/daemonstate',
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'state.router': '/routerstate',
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'state.domain': '/domainstate',
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'vcpu.total': '/vcputotal',
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'vcpu.allocated': '/vcpualloc',
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'memory.total': '/memtotal',
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'memory.used': '/memused',
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'memory.free': '/memfree',
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'memory.allocated': '/memalloc',
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'memory.provisioned': '/memprov',
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'ipmi.hostname': '/ipmihostname',
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'ipmi.username': '/ipmiusername',
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'ipmi.password': '/ipmipassword'
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},
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# The schema of an individual domain entry (/domains/{domain_uuid})
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'domain': {
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'name': '', # The root key
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'xml': '/xml',
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'state': '/state',
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'profile': '/profile',
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'stats': '/stats',
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'node': '/node',
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'last_node': '/lastnode',
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'failed_reason': '/failedreason',
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'console.log': '/consolelog',
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'console.vnc': '/vnc',
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'meta.autostart': '/node_autostart',
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'meta.migrate_method': '/migration_method',
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'meta.node_selector': '/node_selector',
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'meta.node_limit': '/node_limit'
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},
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# The schema of an individual network entry (/networks/{vni})
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'network': {
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'type': '/nettype',
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'rules': '/firewall_rules',
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'nameservers': '/name_servers',
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'domain': '/domain',
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'ip4.gateway': '/ip4_gateway',
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'ip4.network': '/ip4_network',
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'ip4.dhcp': '/dhcp4_flag',
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'ip4.reservations': '/dhcp4_reservations',
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'ip4.dhcp_start': '/dhcp4_start',
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'ip4.dhcp_end': '/dhcp4_end',
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'ip6.gateway': '/ip6_gateway',
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'ip6.network': '/ip6_network',
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'ip6.dhcp': '/dhcp6_flag'
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},
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# The schema of an individual OSD entry (/ceph/osds/{osd_id})
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'osd': {
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'node': '/node',
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'device': '/device',
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'stats': '/stats'
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},
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# The schema of an individual pool entry (/ceph/pools/{pool_name})
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'pool': {
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'pgs': '/pgs',
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'stats': '/stats'
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},
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# The schema of an individual volume entry (/ceph/volumes/{pool_name}/{volume_name})
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'volume': {
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'stats': '/stats'
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},
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# The schema of an individual snapshot entry (/ceph/volumes/{pool_name}/{volume_name}/{snapshot_name})
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'snapshot': {
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'stats': '/stats'
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}
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}
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# Properties
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@property
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def schema_root(self):
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return self._schema_root
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@schema_root.setter
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def schema_root(self, schema_root):
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self._schema_root = schema_root
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@property
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def version(self):
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return int(self._version)
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@version.setter
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def version(self, version):
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self._version = int(version)
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@property
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def schema(self):
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return self._schema
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@schema.setter
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def schema(self, schema):
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self._schema = schema
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def __init__(self):
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pass
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def __repr__(self):
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return f'ZKSchema({self.version})'
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def __lt__(self, other):
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if self.version < other.version:
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return True
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else:
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return False
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def __le__(self, other):
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if self.version <= other.version:
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return True
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else:
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return False
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def __gt__(self, other):
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if self.version > other.version:
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return True
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else:
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return False
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def __ge__(self, other):
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if self.version >= other.version:
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return True
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else:
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return False
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def __eq__(self, other):
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if self.version == other.version:
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return True
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else:
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return False
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# Load the schema of a given version from a file
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def load(self, version):
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print(f'Loading schema version {version}')
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with open(f'daemon_lib/migrations/versions/{version}.json', 'r') as sfh:
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self.schema = json.load(sfh)
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self.version = self.schema.get('version')
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# Get key paths
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def path(self, ipath, item=None):
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itype, *ipath = ipath.split('.')
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if item is None:
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return self.schema.get(itype).get('.'.join(ipath))
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else:
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base_path = self.schema.get('base').get(itype)
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sub_path = self.schema.get(itype).get('.'.join(ipath))
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return f'{base_path}/{item}{sub_path}'
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# Get keys of a schema location
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def keys(self, itype=None):
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if itype is None:
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return list(self.schema.get('base').keys())
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else:
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return list(self.schema.get(itype).keys())
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# Get the active version of a cluster's schema
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def get_version(self, zkhandler):
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try:
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current_version = zkhandler.read(self.path('base.schema.version'))
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except NoNodeError:
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current_version = 0
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return current_version
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# Validate an active schema against a Zookeeper cluster
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def validate(self, zkhandler, path='base'):
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for key in self.keys(path):
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if not zkhandler.exists(self.path(path + '.' + key)):
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print(f"Key not found: {self.path(key)}")
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return False
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return True
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# Apply the current schema to the cluster
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def apply(self, zkhandler, path='base'):
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for key in self.keys(path):
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if not zkhandler.exists(self.path(path + '.' + key)):
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zkhandler.write([
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(self.path(path + '.' + key), '')
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])
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zkhandler.write([
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(self.path('base.schema.version'), self.version)
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])
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# Migrate key diffs
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def run_migrate(self, zkhandler, changes):
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diff_add = changes['add']
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diff_remove = changes['remove']
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diff_rename = changes['rename']
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add_tasks = list()
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for key in diff_add.keys():
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add_tasks.append((diff_add[key], ''))
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remove_tasks = list()
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for key in diff_remove.keys():
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remove_tasks.append(diff_remove[key])
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rename_tasks = list()
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for key in diff_rename.keys():
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rename_tasks.append((diff_rename[key]['from'], diff_rename[key]['to']))
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print(add_tasks)
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print(remove_tasks)
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print(rename_tasks)
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zkhandler.write(add_tasks)
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zkhandler.delete(remove_tasks)
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zkhandler.rename(rename_tasks)
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# Migrate from older to newer schema
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def migrate(self, zkhandler, new_version):
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# Determine the versions in between
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versions = ZKSchema.find_all(start=self.version, end=new_version)
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print(versions)
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for version in versions:
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# Create a new schema at that version
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zkschema_new = ZKSchema()
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zkschema_new.load(version)
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# Get a list of changes
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changes = ZKSchema.key_diff(self, zkschema_new)
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print(changes)
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# Apply those changes
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self.run_migrate(zkhandler, changes)
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# Update the schema version key
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zkhandler.write([
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(self.key('base.schema.version'), zkschema_new.version)
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])
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# Rollback from newer to older schema
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def rollback(self, zkhandler, old_version):
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# Determine the versions in between
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versions = ZKSchema.find_all(start=old_version - 1, end=self.version - 1)
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versions.reverse()
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print(versions)
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for version in versions:
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# Create a new schema at that version
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zkschema_old = ZKSchema()
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zkschema_old.load(version)
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# Get a list of changes
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changes = ZKSchema.key_diff(self, zkschema_old)
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print(changes)
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# Apply those changes
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self.run_migrate(zkhandler, changes)
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# Update the schema version key
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zkhandler.write([
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(self.key('base.schema.version'), zkschema_old.version)
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])
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@classmethod
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def key_diff(cls, schema_a, schema_b):
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# schema_a = current
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# schema_b = new
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diff_add = dict()
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diff_remove = dict()
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diff_rename = dict()
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# Parse through each core element
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for elem in ['base', 'node', 'domain', 'network', 'osd', 'pool', 'volume', 'snapshot']:
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set_a = set(schema_a.keys(elem))
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set_b = set(schema_b.keys(elem))
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diff_keys = set_a ^ set_b
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for item in diff_keys:
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elem_item = elem + '.' + item
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if item not in schema_a.keys(elem) and item in schema_b.keys(elem):
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diff_add[elem_item] = schema_b.path(elem_item)
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if item in schema_a.keys(elem) and item not in schema_b.keys(elem):
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diff_remove[elem_item] = schema_a.path(elem_item)
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for item in set_b:
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elem_item = elem + '.' + item
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if schema_a.path(elem_item) is not None and \
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schema_b.path(elem_item) is not None and \
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schema_a.path(elem_item) != schema_b.path(elem_item):
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diff_rename[elem_item] = {'from': schema_a.path(elem_item), 'to': schema_b.path(elem_item)}
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return {'add': diff_add, 'remove': diff_remove, 'rename': diff_rename}
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# Load in the schemal of the current cluster
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@classmethod
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def load_current(cls, zkhandler):
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new_instance = cls()
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version = new_instance.get_version(zkhandler)
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new_instance.load(version)
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return new_instance
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# Write the latest schema to a file
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@classmethod
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def write(cls):
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schema_file = 'daemon_lib/migrations/versions/{}.json'.format(cls._version)
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with open(schema_file, 'w') as sfh:
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json.dump(cls._schema, sfh)
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# Static methods for reading information from the files
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@staticmethod
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def find_all(start=0, end=None):
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versions = list()
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for version in os.listdir('daemon_lib/migrations/versions'):
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sequence_id = int(version.split('.')[0])
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if end is None:
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if sequence_id > start:
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versions.append(sequence_id)
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else:
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if sequence_id > start and sequence_id <= end:
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versions.append(sequence_id)
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if len(versions) > 0:
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return versions
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else:
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return None
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@ -0,0 +1,43 @@
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#!/usr/bin/env python3
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# flake8: noqa
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import sys
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import datetime
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from daemon_lib.zkhandler import ZKHandler, ZKSchema
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ZKSchema.write()
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sys.exit(0)
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print(datetime.datetime.now())
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zkhandler = ZKHandler({'coordinators': ['hv1.tc', 'hv2.tc', 'hv3.tc']})
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zkhandler.connect()
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print(datetime.datetime.now())
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zkschema = ZKSchema.load_current(zkhandler)
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#print(zkschema.path('base.schema.version'))
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#print(zkschema.path('node.state.daemon', 'hv1'))
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#print(zkschema.path('domain.state', 'test1'))
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#print(zkschema.keys('base'))
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#print(zkschema.keys('node'))
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zkschema.validate(zkhandler)
|
||||
zkschema.apply(zkhandler)
|
||||
|
||||
zkschema_latest = ZKSchema()
|
||||
#if zkschema < zkschema_latest:
|
||||
# print("I'm older")
|
||||
#elif zkschema == zkschema_latest:
|
||||
# print("I'm the same")
|
||||
#elif zkschema > zkschema_latest:
|
||||
# print("I'm newer")
|
||||
|
||||
#diff = ZKSchema.key_diff(zkschema, zkschema_latest)
|
||||
zkschema.migrate(zkhandler, zkschema_latest.version)
|
||||
|
||||
#zkschema_earliest = ZKSchema()
|
||||
#zkschema_earliest.load(0)
|
||||
#zkschema.rollback(zkhandler, zkschema_earliest.version)
|
||||
Loading…
Reference in New Issue