mirror of
https://github.com/matrix-org/dendrite.git
synced 2024-11-30 02:01:56 -06:00
134 lines
4.2 KiB
Go
134 lines
4.2 KiB
Go
// Copyright 2020 The Matrix.org Foundation C.I.C.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package sqlutil
|
|
|
|
import (
|
|
"context"
|
|
"database/sql"
|
|
"strings"
|
|
)
|
|
|
|
// A PartitionOffset is the offset into a partition of the input log.
|
|
type PartitionOffset struct {
|
|
// The ID of the partition.
|
|
Partition int32
|
|
// The offset into the partition.
|
|
Offset int64
|
|
}
|
|
|
|
const partitionOffsetsSchema = `
|
|
-- The offsets that the server has processed up to.
|
|
CREATE TABLE IF NOT EXISTS ${prefix}_partition_offsets (
|
|
-- The name of the topic.
|
|
topic TEXT NOT NULL,
|
|
-- The 32-bit partition ID
|
|
partition INTEGER NOT NULL,
|
|
-- The 64-bit offset.
|
|
partition_offset BIGINT NOT NULL,
|
|
UNIQUE (topic, partition)
|
|
);
|
|
`
|
|
|
|
const selectPartitionOffsetsSQL = "" +
|
|
"SELECT partition, partition_offset FROM ${prefix}_partition_offsets WHERE topic = $1"
|
|
|
|
const upsertPartitionOffsetsSQL = "" +
|
|
"INSERT INTO ${prefix}_partition_offsets (topic, partition, partition_offset) VALUES ($1, $2, $3)" +
|
|
" ON CONFLICT (topic, partition)" +
|
|
" DO UPDATE SET partition_offset = $3"
|
|
|
|
// PartitionOffsetStatements represents a set of statements that can be run on a partition_offsets table.
|
|
type PartitionOffsetStatements struct {
|
|
db *sql.DB
|
|
writer Writer
|
|
selectPartitionOffsetsStmt *sql.Stmt
|
|
upsertPartitionOffsetStmt *sql.Stmt
|
|
}
|
|
|
|
// Prepare converts the raw SQL statements into prepared statements.
|
|
// Takes a prefix to prepend to the table name used to store the partition offsets.
|
|
// This allows multiple components to share the same database schema.
|
|
func (s *PartitionOffsetStatements) Prepare(db *sql.DB, writer Writer, prefix string) (err error) {
|
|
s.db = db
|
|
s.writer = writer
|
|
_, err = db.Exec(strings.Replace(partitionOffsetsSchema, "${prefix}", prefix, -1))
|
|
if err != nil {
|
|
return
|
|
}
|
|
if s.selectPartitionOffsetsStmt, err = db.Prepare(
|
|
strings.Replace(selectPartitionOffsetsSQL, "${prefix}", prefix, -1),
|
|
); err != nil {
|
|
return
|
|
}
|
|
if s.upsertPartitionOffsetStmt, err = db.Prepare(
|
|
strings.Replace(upsertPartitionOffsetsSQL, "${prefix}", prefix, -1),
|
|
); err != nil {
|
|
return
|
|
}
|
|
return
|
|
}
|
|
|
|
// PartitionOffsets implements PartitionStorer
|
|
func (s *PartitionOffsetStatements) PartitionOffsets(
|
|
ctx context.Context, topic string,
|
|
) ([]PartitionOffset, error) {
|
|
return s.selectPartitionOffsets(ctx, topic)
|
|
}
|
|
|
|
// SetPartitionOffset implements PartitionStorer
|
|
func (s *PartitionOffsetStatements) SetPartitionOffset(
|
|
ctx context.Context, topic string, partition int32, offset int64,
|
|
) error {
|
|
return s.upsertPartitionOffset(ctx, topic, partition, offset)
|
|
}
|
|
|
|
// selectPartitionOffsets returns all the partition offsets for the given topic.
|
|
func (s *PartitionOffsetStatements) selectPartitionOffsets(
|
|
ctx context.Context, topic string,
|
|
) (results []PartitionOffset, err error) {
|
|
rows, err := s.selectPartitionOffsetsStmt.QueryContext(ctx, topic)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer checkNamedErr(rows.Close, &err)
|
|
for rows.Next() {
|
|
var offset PartitionOffset
|
|
if err = rows.Scan(&offset.Partition, &offset.Offset); err != nil {
|
|
return nil, err
|
|
}
|
|
results = append(results, offset)
|
|
}
|
|
err = rows.Err()
|
|
return results, err
|
|
}
|
|
|
|
// checkNamedErr calls fn and overwrite err if it was nil and fn returned non-nil
|
|
func checkNamedErr(fn func() error, err *error) {
|
|
if e := fn(); e != nil && *err == nil {
|
|
*err = e
|
|
}
|
|
}
|
|
|
|
// UpsertPartitionOffset updates or inserts the partition offset for the given topic.
|
|
func (s *PartitionOffsetStatements) upsertPartitionOffset(
|
|
ctx context.Context, topic string, partition int32, offset int64,
|
|
) error {
|
|
return s.writer.Do(s.db, nil, func(txn *sql.Tx) error {
|
|
stmt := TxStmt(txn, s.upsertPartitionOffsetStmt)
|
|
_, err := stmt.ExecContext(ctx, topic, partition, offset)
|
|
return err
|
|
})
|
|
}
|