Documentation
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Overview ¶
Package topo provides utility functions for interacting with the Multigres global topology server (etcd). It consolidates store creation and common topology operations (database/cell registration, pooler queries) that were previously duplicated across data-handler controllers.
Index ¶
- func CollectCells(shard *multigresv1alpha1.Shard) []string
- func FindPrimaryPooler(ctx context.Context, store topoclient.Store, shard *multigresv1alpha1.Shard, ...) (*clustermetadatapb.MultiPooler, error)
- func ForceUnregisterPod(ctx context.Context, store topoclient.Store, shard *multigresv1alpha1.Shard, ...) error
- func GetBackupLocation(shard *multigresv1alpha1.Shard) *clustermetadatapb.BackupLocation
- func GetDurabilityPolicy(shard *multigresv1alpha1.Shard) *clustermetadatapb.DurabilityPolicy
- func IsTopoUnavailable(err error) bool
- func NewStoreFromCell(cell *multigresv1alpha1.Cell) (topoclient.Store, error)
- func NewStoreFromRef(ref multigresv1alpha1.GlobalTopoServerRef) (topoclient.Store, error)
- func NewStoreFromShard(shard *multigresv1alpha1.Shard) (topoclient.Store, error)
- func PodMatchesPooler(podName string, p *topoclient.MultiPoolerInfo) bool
- func PruneCells(ctx context.Context, store topoclient.Store, recorder record.EventRecorder, ...) error
- func PruneDatabases(ctx context.Context, store topoclient.Store, recorder record.EventRecorder, ...) error
- func PrunePoolers(ctx context.Context, store topoclient.Store, shard *multigresv1alpha1.Shard, ...) (int, error)
- func RegisterCell(ctx context.Context, store topoclient.Store, recorder record.EventRecorder, ...) error
- func RegisterCellFromSpec(ctx context.Context, store topoclient.Store, recorder record.EventRecorder, ...) error
- func RegisterDatabase(ctx context.Context, store topoclient.Store, recorder record.EventRecorder, ...) error
- func RegisterDatabaseFromSpec(ctx context.Context, store topoclient.Store, recorder record.EventRecorder, ...) error
- func ShardFilter(shard *multigresv1alpha1.Shard) *topoclient.GetMultiPoolersByCellOptions
- func UnregisterCell(ctx context.Context, store topoclient.Store, recorder record.EventRecorder, ...) error
- func UnregisterDatabase(ctx context.Context, store topoclient.Store, recorder record.EventRecorder, ...) error
- type PoolerStatusResult
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func CollectCells ¶
func CollectCells(shard *multigresv1alpha1.Shard) []string
CollectCells returns the sorted, deduplicated set of cell names from the shard's pools.
func FindPrimaryPooler ¶
func FindPrimaryPooler( ctx context.Context, store topoclient.Store, shard *multigresv1alpha1.Shard, cells []string, ) (*clustermetadatapb.MultiPooler, error)
FindPrimaryPooler discovers the PRIMARY multipooler from the given cells in the topology. Returns (nil, nil) only if at least one cell was successfully queried but no primary was found. Returns an error if all cells are unavailable.
func ForceUnregisterPod ¶
func ForceUnregisterPod( ctx context.Context, store topoclient.Store, shard *multigresv1alpha1.Shard, podName string, cellName string, ) error
ForceUnregisterPod unregisters a specific pod's pooler from the topology.
func GetBackupLocation ¶
func GetBackupLocation(shard *multigresv1alpha1.Shard) *clustermetadatapb.BackupLocation
GetBackupLocation extracts the backup location from the shard config.
func GetDurabilityPolicy ¶
func GetDurabilityPolicy(shard *multigresv1alpha1.Shard) *clustermetadatapb.DurabilityPolicy
GetDurabilityPolicy extracts the durability policy from the shard config. Falls back to "AT_LEAST_2" if not set (the default materialized by the webhook resolver).
func IsTopoUnavailable ¶
IsTopoUnavailable returns true if the error indicates the topology server is not reachable (e.g., gRPC UNAVAILABLE during startup).
func NewStoreFromCell ¶
func NewStoreFromCell(cell *multigresv1alpha1.Cell) (topoclient.Store, error)
NewStoreFromCell creates a topoclient.Store using the GlobalTopoServer configuration from a Cell resource.
func NewStoreFromRef ¶
func NewStoreFromRef(ref multigresv1alpha1.GlobalTopoServerRef) (topoclient.Store, error)
NewStoreFromRef creates a topoclient.Store using a GlobalTopoServerRef. This is used by the MultigresCluster controller which already computes the reference via getGlobalTopoRef().
func NewStoreFromShard ¶
func NewStoreFromShard(shard *multigresv1alpha1.Shard) (topoclient.Store, error)
NewStoreFromShard creates a topoclient.Store using the GlobalTopoServer configuration from a Shard resource.
func PodMatchesPooler ¶
func PodMatchesPooler(podName string, p *topoclient.MultiPoolerInfo) bool
PodMatchesPooler checks if the topology pooler record corresponds to the given Kubernetes pod name.
func PruneCells ¶
func PruneCells( ctx context.Context, store topoclient.Store, recorder record.EventRecorder, owner runtime.Object, specCellNames []string, ) error
PruneCells removes stale cell entries from the topology that are not present in the cluster spec.
func PruneDatabases ¶
func PruneDatabases( ctx context.Context, store topoclient.Store, recorder record.EventRecorder, owner runtime.Object, specDBNames []string, ) error
PruneDatabases removes stale database entries from the topology that are not present in the cluster spec.
func PrunePoolers ¶
func PrunePoolers( ctx context.Context, store topoclient.Store, shard *multigresv1alpha1.Shard, activePodNames map[string]bool, ) (int, error)
PrunePoolers removes topology entries for poolers that have no corresponding running pod. activePodNames should contain the names of all pods currently managed by the shard. Returns the number of pruned entries.
func RegisterCell ¶
func RegisterCell( ctx context.Context, store topoclient.Store, recorder record.EventRecorder, cell *multigresv1alpha1.Cell, ) error
RegisterCell registers the cell metadata in the global topology.
func RegisterCellFromSpec ¶
func RegisterCellFromSpec( ctx context.Context, store topoclient.Store, recorder record.EventRecorder, owner runtime.Object, cellConfig multigresv1alpha1.CellConfig, topoRef multigresv1alpha1.GlobalTopoServerRef, ) error
RegisterCellFromSpec registers a cell in the topology using the cluster spec. It uses the GlobalTopoServerRef to build the cell metadata.
func RegisterDatabase ¶
func RegisterDatabase( ctx context.Context, store topoclient.Store, recorder record.EventRecorder, shard *multigresv1alpha1.Shard, ) error
RegisterDatabase registers the database metadata in the global topology. It creates the database entry or updates it if it already exists.
func RegisterDatabaseFromSpec ¶
func RegisterDatabaseFromSpec( ctx context.Context, store topoclient.Store, recorder record.EventRecorder, owner runtime.Object, dbConfig multigresv1alpha1.DatabaseConfig, allCellNames []string, backup *multigresv1alpha1.BackupConfig, clusterDurabilityPolicy string, ) error
RegisterDatabaseFromSpec registers a database in the topology using the cluster spec. It collects cells from all pools across all shards in the database's table groups.
func ShardFilter ¶
func ShardFilter(shard *multigresv1alpha1.Shard) *topoclient.GetMultiPoolersByCellOptions
ShardFilter builds a GetMultiPoolersByCellOptions filter for a shard.
func UnregisterCell ¶
func UnregisterCell( ctx context.Context, store topoclient.Store, recorder record.EventRecorder, cell *multigresv1alpha1.Cell, ) error
UnregisterCell removes the cell metadata from the global topology.
func UnregisterDatabase ¶
func UnregisterDatabase( ctx context.Context, store topoclient.Store, recorder record.EventRecorder, shard *multigresv1alpha1.Shard, ) error
UnregisterDatabase removes the database metadata from the global topology.
Types ¶
type PoolerStatusResult ¶
type PoolerStatusResult struct {
// Roles maps hostname to role string (PRIMARY, REPLICA, DRAINED).
Roles map[string]string
// QuerySuccess indicates whether all topology queries succeeded.
QuerySuccess bool
}
PoolerStatusResult holds the result of querying pooler roles from the topology.
func GetPoolerStatus ¶
func GetPoolerStatus( ctx context.Context, store topoclient.Store, shard *multigresv1alpha1.Shard, managedPodNames []string, ) *PoolerStatusResult
GetPoolerStatus queries the topology for all poolers belonging to a shard and returns a map of pod name to role string. managedPodNames is the set of Kubernetes pod names currently managed by the shard controller; topology entries are matched to pods via PodMatchesPooler (FQDN-aware).
Source Files