Switch back to cgo-based SQLite driver

In our experience, the pure Go SQLite driver introduced in upstream cmgr
v0.13.0 had issues handling a large number of concurrent requests (such
as during major competitions). Operations would often fail due to
SQLITE_BUSY errors. See also package issues [0][1][2][3][4][5].

Due to this issue, we had previously forced to roll back to upstream
cmgr v0.12.0. By reverting back to the cgo-based driver, we can take
advantage of the other fixes made since that release.

[0]: https://gitlab.com/cznic/sqlite/-/issues/74
[1]: https://gitlab.com/cznic/sqlite/-/issues/115
[2]: https://gitlab.com/cznic/sqlite/-/issues/126
[3]: https://gitlab.com/cznic/sqlite/-/issues/142
[4]: https://gitlab.com/cznic/sqlite/-/issues/146
[5]: https://gitlab.com/cznic/sqlite/-/issues/161

NOTICE.release

@@ -87,34 +87,30 @@ OTHER DEALINGS IN THE SOFTWARE.
 
 ------------------------------------------------------------------------------
 
-This work uses the 'modernc.org/sqlite' module for Go:
+This work uses the 'github.com/mattn/go-sqlite3' module for Go:
 
-Copyright (c) 2017 The Sqlite Authors. All rights reserved.
+go-sqlite3
+The MIT License (MIT)
 
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-1. Redistributions of source code must retain the above copyright notice, this
-list of conditions and the following disclaimer.
-
-2. Redistributions in binary form must reproduce the above copyright notice,
-this list of conditions and the following disclaimer in the documentation
-and/or other materials provided with the distribution.
-
-3. Neither the name of the copyright holder nor the names of its contributors
-may be used to endorse or promote products derived from this software without
-specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
-ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
-FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
-OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+Copyright (c) 2014 Yasuhiro Matsumoto
+
+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.
 
 ------------------------------------------------------------------------------
 

cmgr/database.go

@@ -7,7 +7,7 @@ import (
 	"reflect"
 
 	"github.com/jmoiron/sqlx"
-	_ "modernc.org/sqlite"
+	_ "github.com/mattn/go-sqlite3"
 )
 
 const schemaQuery string = `
@@ -179,7 +179,7 @@ func (m *Manager) initDatabase() error {
 		dbPath = "cmgr.db"
 	}
 
-	db, err := sqlx.Open("sqlite", dbPath+"?_pragma=foreign_keys(1)")
+	db, err := sqlx.Open("sqlite3", dbPath+"?_fk=true")
 	if err != nil {
 		m.log.errorf("could not open database: %s", err)
 		return err

go.mod

@@ -10,17 +10,13 @@ require (
 	github.com/docker/docker v20.10.13+incompatible
 	github.com/docker/go-connections v0.4.0
 	github.com/docker/go-units v0.4.0
-	github.com/gogo/googleapis v1.4.1 // indirect
 	github.com/jmoiron/sqlx v1.3.4
-	github.com/klauspost/compress v1.15.0 // indirect
-	github.com/moby/sys/mountinfo v0.6.0 // indirect
-	github.com/moby/sys/signal v0.7.0 // indirect
+	github.com/mattn/go-sqlite3 v1.14.9
 	github.com/opencontainers/image-spec v1.0.2 // indirect
 	github.com/yuin/goldmark v1.4.2
 	golang.org/x/net v0.0.0-20220225172249-27dd8689420f // indirect
 	golang.org/x/sys v0.0.0-20220310020820-b874c991c1a5 // indirect
 	google.golang.org/genproto v0.0.0-20220310185008-1973136f34c6 // indirect
 	google.golang.org/grpc v1.45.0 // indirect
 	gopkg.in/yaml.v2 v2.4.0
-	modernc.org/sqlite v1.14.6
 )