dendrite/federationsender/storage/postgres/queue_pdus_table.go

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// 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 postgres
import (
"context"
"database/sql"
"github.com/matrix-org/dendrite/internal"
"github.com/matrix-org/dendrite/internal/sqlutil"
"github.com/matrix-org/gomatrixserverlib"
)
const queuePDUsSchema = `
CREATE TABLE IF NOT EXISTS federationsender_queue_pdus (
-- The transaction ID that was generated before persisting the event.
transaction_id TEXT NOT NULL,
-- The destination server that we will send the event to.
server_name TEXT NOT NULL,
-- The JSON NID from the federationsender_queue_pdus_json table.
json_nid BIGINT NOT NULL
);
CREATE UNIQUE INDEX IF NOT EXISTS federationsender_queue_pdus_pdus_json_nid_idx
ON federationsender_queue_pdus (json_nid, server_name);
`
const insertQueuePDUSQL = "" +
"INSERT INTO federationsender_queue_pdus (transaction_id, server_name, json_nid)" +
" VALUES ($1, $2, $3)"
const deleteQueueTransactionPDUsSQL = "" +
"DELETE FROM federationsender_queue_pdus WHERE server_name = $1 AND transaction_id = $2"
const selectQueueNextTransactionIDSQL = "" +
"SELECT transaction_id FROM federationsender_queue_pdus" +
" WHERE server_name = $1" +
" ORDER BY transaction_id ASC" +
" LIMIT 1"
const selectQueuePDUsByTransactionSQL = "" +
"SELECT json_nid FROM federationsender_queue_pdus" +
" WHERE server_name = $1 AND transaction_id = $2" +
" LIMIT $3"
const selectQueueReferenceJSONCountSQL = "" +
"SELECT COUNT(*) FROM federationsender_queue_pdus" +
" WHERE json_nid = $1"
const selectQueuePDUsCountSQL = "" +
"SELECT COUNT(*) FROM federationsender_queue_pdus" +
" WHERE server_name = $1"
type queuePDUsStatements struct {
insertQueuePDUStmt *sql.Stmt
deleteQueueTransactionPDUsStmt *sql.Stmt
selectQueueNextTransactionIDStmt *sql.Stmt
selectQueuePDUsByTransactionStmt *sql.Stmt
selectQueueReferenceJSONCountStmt *sql.Stmt
selectQueuePDUsCountStmt *sql.Stmt
}
func (s *queuePDUsStatements) prepare(db *sql.DB) (err error) {
_, err = db.Exec(queuePDUsSchema)
if err != nil {
return
}
if s.insertQueuePDUStmt, err = db.Prepare(insertQueuePDUSQL); err != nil {
return
}
if s.deleteQueueTransactionPDUsStmt, err = db.Prepare(deleteQueueTransactionPDUsSQL); err != nil {
return
}
if s.selectQueueNextTransactionIDStmt, err = db.Prepare(selectQueueNextTransactionIDSQL); err != nil {
return
}
if s.selectQueuePDUsByTransactionStmt, err = db.Prepare(selectQueuePDUsByTransactionSQL); err != nil {
return
}
if s.selectQueueReferenceJSONCountStmt, err = db.Prepare(selectQueueReferenceJSONCountSQL); err != nil {
return
}
if s.selectQueuePDUsCountStmt, err = db.Prepare(selectQueuePDUsCountSQL); err != nil {
return
}
return
}
func (s *queuePDUsStatements) insertQueuePDU(
ctx context.Context,
txn *sql.Tx,
transactionID gomatrixserverlib.TransactionID,
serverName gomatrixserverlib.ServerName,
nid int64,
) error {
stmt := sqlutil.TxStmt(txn, s.insertQueuePDUStmt)
_, err := stmt.ExecContext(
ctx,
transactionID, // the transaction ID that we initially attempted
serverName, // destination server name
nid, // JSON blob NID
)
return err
}
func (s *queuePDUsStatements) deleteQueueTransaction(
ctx context.Context, txn *sql.Tx,
serverName gomatrixserverlib.ServerName,
transactionID gomatrixserverlib.TransactionID,
) error {
stmt := sqlutil.TxStmt(txn, s.deleteQueueTransactionPDUsStmt)
_, err := stmt.ExecContext(ctx, serverName, transactionID)
return err
}
func (s *queuePDUsStatements) selectQueueNextTransactionID(
ctx context.Context, txn *sql.Tx, serverName gomatrixserverlib.ServerName,
) (gomatrixserverlib.TransactionID, error) {
var transactionID gomatrixserverlib.TransactionID
stmt := sqlutil.TxStmt(txn, s.selectQueueNextTransactionIDStmt)
err := stmt.QueryRowContext(ctx, serverName).Scan(&transactionID)
if err == sql.ErrNoRows {
return "", nil
}
return transactionID, err
}
func (s *queuePDUsStatements) selectQueueReferenceJSONCount(
ctx context.Context, txn *sql.Tx, jsonNID int64,
) (int64, error) {
var count int64
stmt := sqlutil.TxStmt(txn, s.selectQueueReferenceJSONCountStmt)
err := stmt.QueryRowContext(ctx, jsonNID).Scan(&count)
if err == sql.ErrNoRows {
// It's acceptable for there to be no rows referencing a given
// JSON NID but it's not an error condition. Just return as if
// there's a zero count.
return 0, nil
}
return count, err
}
func (s *queuePDUsStatements) selectQueuePDUCount(
ctx context.Context, txn *sql.Tx, serverName gomatrixserverlib.ServerName,
) (int64, error) {
var count int64
stmt := sqlutil.TxStmt(txn, s.selectQueuePDUsCountStmt)
err := stmt.QueryRowContext(ctx, serverName).Scan(&count)
if err == sql.ErrNoRows {
// It's acceptable for there to be no rows referencing a given
// JSON NID but it's not an error condition. Just return as if
// there's a zero count.
return 0, nil
}
return count, err
}
func (s *queuePDUsStatements) selectQueuePDUs(
ctx context.Context, txn *sql.Tx,
serverName gomatrixserverlib.ServerName,
transactionID gomatrixserverlib.TransactionID,
limit int,
) ([]int64, error) {
stmt := sqlutil.TxStmt(txn, s.selectQueuePDUsByTransactionStmt)
rows, err := stmt.QueryContext(ctx, serverName, transactionID, limit)
if err != nil {
return nil, err
}
defer internal.CloseAndLogIfError(ctx, rows, "queueFromStmt: rows.close() failed")
var result []int64
for rows.Next() {
var nid int64
if err = rows.Scan(&nid); err != nil {
return nil, err
}
result = append(result, nid)
}
return result, rows.Err()
}