135 lines
4.3 KiB
Go
135 lines
4.3 KiB
Go
/*
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Copyright 2023 The Dapr Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cockroachdb
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import (
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"context"
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"fmt"
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pginterfaces "github.com/dapr/components-contrib/common/component/postgresql/interfaces"
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postgresql "github.com/dapr/components-contrib/common/component/postgresql/v1"
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"github.com/dapr/components-contrib/state"
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"github.com/dapr/kit/logger"
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)
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// New creates a new instance of CockroachDB state store.
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func New(logger logger.Logger) state.Store {
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return postgresql.NewPostgreSQLQueryStateStore(logger, postgresql.Options{
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ETagColumn: "etag",
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MigrateFn: ensureTables,
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SetQueryFn: func(req *state.SetRequest, opts postgresql.SetQueryOptions) string {
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// Sprintf is required for table name because the driver does not substitute parameters for table names.
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if !req.HasETag() {
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// We do an upsert in both cases, even when concurrency is first-write, because the row may exist but be expired (and not yet garbage collected)
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// The difference is that with concurrency as first-write, we'll update the row only if it's expired
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var whereClause string
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if req.Options.Concurrency == state.FirstWrite {
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whereClause = " WHERE (t.expiredate IS NOT NULL AND t.expiredate < now())"
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}
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return `
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INSERT INTO ` + opts.TableName + ` AS t
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(key, value, isbinary, etag, expiredate)
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VALUES
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($1, $2, $3, 1, ` + opts.ExpireDateValue + `)
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ON CONFLICT (key) DO UPDATE SET
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value = $2,
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isbinary = $3,
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updatedate = now(),
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etag = EXCLUDED.etag + 1,
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expiredate = ` + opts.ExpireDateValue +
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whereClause
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}
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// When an etag is provided do an update - no insert.
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return `
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UPDATE ` + opts.TableName + `
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SET
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value = $2,
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isbinary = $3,
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updatedate = now(),
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etag = etag + 1,
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expiredate = ` + opts.ExpireDateValue + `
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WHERE
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key = $1
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AND etag = $4
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AND (expiredate IS NULL OR expiredate >= now());`
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},
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})
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}
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func ensureTables(ctx context.Context, db pginterfaces.PGXPoolConn, opts postgresql.MigrateOptions) error {
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exists, err := tableExists(ctx, db, opts.StateTableName)
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if err != nil {
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return fmt.Errorf("failed to check if table '%s' exists: %w", opts.StateTableName, err)
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}
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if !exists {
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opts.Logger.Info("Creating CockroachDB state table")
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_, err = db.Exec(ctx, fmt.Sprintf(`
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CREATE TABLE %s (
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key text NOT NULL PRIMARY KEY,
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value jsonb NOT NULL,
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isbinary boolean NOT NULL,
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etag INT,
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insertdate TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
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updatedate TIMESTAMP WITH TIME ZONE NULL,
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expiredate TIMESTAMP WITH TIME ZONE NULL,
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INDEX expiredate_idx (expiredate)
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)`,
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opts.StateTableName))
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if err != nil {
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return fmt.Errorf("failed to create state table: %w", err)
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}
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}
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// If table was created before v1.11.
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_, err = db.Exec(ctx, fmt.Sprintf(
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`ALTER TABLE %s ADD COLUMN IF NOT EXISTS expiredate TIMESTAMP WITH TIME ZONE NULL;`, opts.StateTableName))
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if err != nil {
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return fmt.Errorf("failed to add expiredate column to state table: %w", err)
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}
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_, err = db.Exec(ctx, fmt.Sprintf(
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`CREATE INDEX IF NOT EXISTS expiredate_idx ON %s (expiredate);`, opts.StateTableName))
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if err != nil {
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return fmt.Errorf("failed to create expiredate index on state table: %w", err)
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}
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exists, err = tableExists(ctx, db, opts.MetadataTableName)
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if err != nil {
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return fmt.Errorf("failed to check if table '%s' exists: %w", opts.MetadataTableName, err)
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}
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if !exists {
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opts.Logger.Info("Creating CockroachDB metadata table")
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_, err = db.Exec(ctx, fmt.Sprintf(`
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CREATE TABLE %s (
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key text NOT NULL PRIMARY KEY,
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value text NOT NULL
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);`,
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opts.MetadataTableName))
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if err != nil {
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return fmt.Errorf("failed to create metadata table: %w", err)
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}
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}
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return nil
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}
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func tableExists(ctx context.Context, db pginterfaces.PGXPoolConn, tableName string) (bool, error) {
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exists := false
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err := db.QueryRow(ctx, "SELECT EXISTS (SELECT * FROM pg_tables WHERE tablename = $1)", tableName).Scan(&exists)
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return exists, err
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}
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