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queue.go
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queue.go
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// Copyright (c) 2019 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package postgres
import (
"context"
"database/sql"
"encoding/json"
"github.com/uber/cadence/common/persistence"
"github.com/uber/cadence/common/persistence/sql/sqlplugin"
)
const (
templateEnqueueMessageQuery = `INSERT INTO queue (queue_type, message_id, message_payload) VALUES(:queue_type, :message_id, :message_payload)`
templateGetLastMessageIDQuery = `SELECT message_id FROM queue WHERE queue_type=$1 ORDER BY message_id DESC LIMIT 1 FOR UPDATE`
templateGetMessagesQuery = `SELECT message_id, message_payload FROM queue WHERE queue_type = $1 and message_id > $2 ORDER BY message_id ASC LIMIT $3`
templateGetMessagesBetweenQuery = `SELECT message_id, message_payload FROM queue WHERE queue_type = $1 and message_id > $2 and message_id <= $3 ORDER BY message_id ASC LIMIT $4`
templateDeleteMessageQuery = `DELETE FROM queue WHERE queue_type = $1 and message_id = $2`
templateDeleteMessagesBeforeQuery = `DELETE FROM queue WHERE queue_type = $1 and message_id < $2`
templateRangeDeleteMessagesQuery = `DELETE FROM queue WHERE queue_type = $1 and message_id > $2 and message_id <= $3`
templateGetQueueMetadataQuery = `SELECT data from queue_metadata WHERE queue_type = $1`
templateGetQueueMetadataForUpdateQuery = templateGetQueueMetadataQuery + ` FOR UPDATE`
templateInsertQueueMetadataQuery = `INSERT INTO queue_metadata (queue_type, data) VALUES(:queue_type, :data)`
templateUpdateQueueMetadataQuery = `UPDATE queue_metadata SET data = $1 WHERE queue_type = $2`
templateGetQueueSizeQuery = `SELECT COUNT(1) AS count FROM queue WHERE queue_type=$1`
)
// InsertIntoQueue inserts a new row into queue table
func (pdb *db) InsertIntoQueue(ctx context.Context, row *sqlplugin.QueueRow) (sql.Result, error) {
return pdb.driver.NamedExecContext(ctx, sqlplugin.DbDefaultShard, templateEnqueueMessageQuery, row)
}
// GetLastEnqueuedMessageIDForUpdate returns the last enqueued message ID
func (pdb *db) GetLastEnqueuedMessageIDForUpdate(ctx context.Context, queueType persistence.QueueType) (int64, error) {
var lastMessageID int64
err := pdb.driver.GetContext(ctx, sqlplugin.DbDefaultShard, &lastMessageID, templateGetLastMessageIDQuery, queueType)
return lastMessageID, err
}
// GetMessagesFromQueue retrieves messages from the queue
func (pdb *db) GetMessagesFromQueue(ctx context.Context, queueType persistence.QueueType, lastMessageID int64, maxRows int) ([]sqlplugin.QueueRow, error) {
var rows []sqlplugin.QueueRow
err := pdb.driver.SelectContext(ctx, sqlplugin.DbDefaultShard, &rows, templateGetMessagesQuery, queueType, lastMessageID, maxRows)
return rows, err
}
// GetMessagesBetween retrieves messages from the queue
func (pdb *db) GetMessagesBetween(ctx context.Context, queueType persistence.QueueType, firstMessageID int64, lastMessageID int64, maxRows int) ([]sqlplugin.QueueRow, error) {
var rows []sqlplugin.QueueRow
err := pdb.driver.SelectContext(ctx, sqlplugin.DbDefaultShard, &rows, templateGetMessagesBetweenQuery, queueType, firstMessageID, lastMessageID, maxRows)
return rows, err
}
// DeleteMessagesBefore deletes messages before messageID from the queue
func (pdb *db) DeleteMessagesBefore(ctx context.Context, queueType persistence.QueueType, messageID int64) (sql.Result, error) {
return pdb.driver.ExecContext(ctx, sqlplugin.DbDefaultShard, templateDeleteMessagesBeforeQuery, queueType, messageID)
}
// RangeDeleteMessages deletes messages before messageID from the queue
func (pdb *db) RangeDeleteMessages(ctx context.Context, queueType persistence.QueueType, exclusiveBeginMessageID int64, inclusiveEndMessageID int64) (sql.Result, error) {
return pdb.driver.ExecContext(ctx, sqlplugin.DbDefaultShard, templateRangeDeleteMessagesQuery, queueType, exclusiveBeginMessageID, inclusiveEndMessageID)
}
// DeleteMessage deletes message with a messageID from the queue
func (pdb *db) DeleteMessage(ctx context.Context, queueType persistence.QueueType, messageID int64) (sql.Result, error) {
return pdb.driver.ExecContext(ctx, sqlplugin.DbDefaultShard, templateDeleteMessageQuery, queueType, messageID)
}
// InsertAckLevel inserts ack level
func (pdb *db) InsertAckLevel(ctx context.Context, queueType persistence.QueueType, messageID int64, clusterName string) error {
clusterAckLevels := map[string]int64{clusterName: messageID}
data, err := json.Marshal(clusterAckLevels)
if err != nil {
return err
}
_, err = pdb.driver.NamedExecContext(ctx, sqlplugin.DbDefaultShard, templateInsertQueueMetadataQuery, sqlplugin.QueueMetadataRow{QueueType: queueType, Data: data})
return err
}
// UpdateAckLevels updates cluster ack levels
func (pdb *db) UpdateAckLevels(ctx context.Context, queueType persistence.QueueType, clusterAckLevels map[string]int64) error {
data, err := json.Marshal(clusterAckLevels)
if err != nil {
return err
}
_, err = pdb.driver.ExecContext(ctx, sqlplugin.DbDefaultShard, templateUpdateQueueMetadataQuery, data, queueType)
return err
}
// GetAckLevels returns ack levels for pulling clusters
func (pdb *db) GetAckLevels(ctx context.Context, queueType persistence.QueueType, forUpdate bool) (map[string]int64, error) {
queryStr := templateGetQueueMetadataQuery
if forUpdate {
queryStr = templateGetQueueMetadataForUpdateQuery
}
var data []byte
err := pdb.driver.GetContext(ctx, sqlplugin.DbDefaultShard, &data, queryStr, queueType)
if err != nil {
if err == sql.ErrNoRows {
return nil, nil
}
return nil, err
}
var clusterAckLevels map[string]int64
if err := json.Unmarshal(data, &clusterAckLevels); err != nil {
return nil, err
}
return clusterAckLevels, nil
}
// GetQueueSize returns the queue size
func (pdb *db) GetQueueSize(
ctx context.Context,
queueType persistence.QueueType,
) (int64, error) {
var size []int64
if err := pdb.driver.SelectContext(
ctx,
sqlplugin.DbDefaultShard,
&size,
templateGetQueueSizeQuery,
queueType,
); err != nil {
return 0, err
}
return size[0], nil
}