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package sqlite_test
import (
"context"
"fmt"
"os"
"runtime"
"testing"
"time"
"github.com/go-llsqlite/crawshaw"
"github.com/go-llsqlite/crawshaw/sqlitex"
)
var db = fmt.Sprintf("%v/snapshot_test_%v.sqlite3",
os.TempDir(), time.Now().UnixNano())
func initDB(t *testing.T) (*sqlite.Conn, *sqlitex.Pool, func()) {
conn, err := sqlite.OpenConn(db, 0)
if err != nil {
t.Fatal(err)
}
if err := sqlitex.ExecScript(conn, `CREATE TABLE t (c1 PRIMARY KEY, c2, c3);
INSERT INTO t (c1, c2, c3) VALUES (1, 2, 3);
INSERT INTO t (c1, c2, c3) VALUES (2, 4, 5);`); err != nil {
conn.Close()
os.Remove(db)
t.Fatal(err)
}
poolFlags := sqlite.SQLITE_OPEN_READONLY |
sqlite.SQLITE_OPEN_WAL |
sqlite.SQLITE_OPEN_URI |
sqlite.SQLITE_OPEN_NOMUTEX
poolSize := 2
pool, err := sqlitex.Open(db, poolFlags, poolSize)
if err != nil {
conn.Close()
os.Remove(db)
t.Fatal(err)
}
cleanup := func() {
pool.Close()
conn.Close()
os.Remove(db)
}
for i := 0; i < poolSize; i++ {
c := pool.Get(nil)
if err := sqlitex.ExecScript(c, `PRAGMA application_id;`); err != nil {
cleanup()
t.Fatal(err)
}
pool.Put(c)
}
return conn, pool, cleanup
}
func TestSnapshot(t *testing.T) {
conn, pool, cleanup := initDB(t)
defer cleanup()
s1, err := pool.GetSnapshot(nil, "")
if err != nil {
t.Fatal(err)
}
if err := sqlitex.ExecScript(conn, `UPDATE t SET c2 = 100;
INSERT INTO t (c2, c3) VALUES (2, 3);
INSERT INTO t (c2, c3) VALUES (2, 3);
INSERT INTO t (c2, c3) VALUES (2, 3);
INSERT INTO t (c2, c3) VALUES (2, 3);
INSERT INTO t (c2, c3) VALUES (2, 3);
INSERT INTO t (c2, c3) VALUES (2, 3); `); err != nil {
t.Fatal(err)
}
if err := sqlitex.Exec(conn, `PRAGMA wal_checkpoint;`, nil); err != nil {
t.Fatal(err)
}
read := pool.Get(nil)
defer pool.Put(read)
endRead, err := read.StartSnapshotRead(s1)
if err != nil {
t.Fatal(err)
}
c2, err := sqlitex.ResultInt(read.Prep(`SELECT c2 FROM t WHERE c1 = 1;`))
if c2 != 2 {
t.Fatalf("expected row1 c2 to be 2 but found %v", c2)
}
endRead()
c2, err = sqlitex.ResultInt(read.Prep(`SELECT c2 FROM t WHERE c1 = 1;`))
if c2 != 100 {
t.Fatalf("expected row1 c2 to be 100 but found %v", c2)
}
s2, release, err := read.GetSnapshot("")
if err != nil {
t.Fatal(err)
}
defer s2.Free()
defer release()
if cmp := s1.CompareAges(s2); cmp >= 0 {
t.Fatalf("expected s1 to be older than s2 but CompareAges returned %v", cmp)
}
s1 = nil
runtime.GC()
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
read2 := pool.Get(ctx)
if read2 == nil {
t.Fatalf("expected to get another conn from the pool, but it was nil")
}
defer pool.Put(read2)
}
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