[chore] Update go-sqlite3 to 0.18.3 (#3295)

* [chore] Update go-sqlite3 to 0.18.3

* [chore] Fix getting the sqlite3.Conn

vendor/github.com/ncruces/go-sqlite3/vfs/lock.go

@@ -79,16 +79,15 @@ func (f *vfsFile) Lock(lock LockLevel) error {
 		// A PENDING lock is needed before acquiring an EXCLUSIVE lock.
 		if f.lock < LOCK_PENDING {
 			// If we're already RESERVED, we can block indefinitely,
-			// since only new readers may briefly hold the PENDING lock.
+			// since only incoming readers may briefly hold the PENDING lock.
 			if rc := osGetPendingLock(f.File, reserved /* block */); rc != _OK {
 				return rc
 			}
 			f.lock = LOCK_PENDING
 		}
-		// We already have PENDING, so we're just waiting for readers to leave.
-		// If we were RESERVED, we can wait for a little while, before invoking
-		// the busy handler; we will only do this once.
-		if rc := osGetExclusiveLock(f.File, reserved /* wait */); rc != _OK {
+		// We are now PENDING, so we're just waiting for readers to leave.
+		// If we were RESERVED, we can block for a bit before invoking the busy handler.
+		if rc := osGetExclusiveLock(f.File, reserved /* block */); rc != _OK {
 			return rc
 		}
 		f.lock = LOCK_EXCLUSIVE

vendor/github.com/ncruces/go-sqlite3/vfs/os_linux.go

@@ -53,10 +53,11 @@ func osLock(file *os.File, typ int16, start, len int64, timeout time.Duration, d
 			if errno, _ := err.(unix.Errno); errno != unix.EAGAIN {
 				break
 			}
-			if timeout < time.Since(before) {
+			if time.Since(before) > timeout {
 				break
 			}
-			time.Sleep(time.Duration(rand.Int63n(int64(time.Millisecond))))
+			const sleepIncrement = 1024*1024 - 1 // power of two, ~1ms
+			time.Sleep(time.Duration(rand.Int63() & sleepIncrement))
 		}
 	}
 	return osLockErrorCode(err, def)

vendor/github.com/ncruces/go-sqlite3/vfs/os_unix_lock.go

@@ -32,9 +32,9 @@ func osGetPendingLock(file *os.File, block bool) _ErrorCode {
 	return osWriteLock(file, _PENDING_BYTE, 1, timeout)
 }
 
-func osGetExclusiveLock(file *os.File, wait bool) _ErrorCode {
+func osGetExclusiveLock(file *os.File, block bool) _ErrorCode {
 	var timeout time.Duration
-	if wait {
+	if block {
 		timeout = time.Millisecond
 	}
 	// Acquire the EXCLUSIVE lock.

vendor/github.com/ncruces/go-sqlite3/vfs/os_windows.go

@@ -38,9 +38,9 @@ func osGetPendingLock(file *os.File, block bool) _ErrorCode {
 	return osWriteLock(file, _PENDING_BYTE, 1, timeout)
 }
 
-func osGetExclusiveLock(file *os.File, wait bool) _ErrorCode {
+func osGetExclusiveLock(file *os.File, block bool) _ErrorCode {
 	var timeout time.Duration
-	if wait {
+	if block {
 		timeout = time.Millisecond
 	}
 
@@ -134,10 +134,11 @@ func osLock(file *os.File, flags, start, len uint32, timeout time.Duration, def
 			if errno, _ := err.(windows.Errno); errno != windows.ERROR_LOCK_VIOLATION {
 				break
 			}
-			if timeout < time.Since(before) {
+			if time.Since(before) > timeout {
 				break
 			}
-			time.Sleep(time.Duration(rand.Int63n(int64(time.Millisecond))))
+			const sleepIncrement = 1024*1024 - 1 // power of two, ~1ms
+			time.Sleep(time.Duration(rand.Int63() & sleepIncrement))
 		}
 	}
 	return osLockErrorCode(err, def)

vendor/github.com/ncruces/go-sqlite3/vfs/shm.go

@@ -6,6 +6,7 @@ import (
 	"context"
 	"io"
 	"os"
+	"time"
 
 	"github.com/ncruces/go-sqlite3/internal/util"
 	"github.com/tetratelabs/wazero/api"
@@ -49,6 +50,7 @@ type vfsShm struct {
 	path     string
 	regions  []*util.MappedRegion
 	readOnly bool
+	blocking bool
 }
 
 func (s *vfsShm) shmOpen() _ErrorCode {
@@ -76,6 +78,13 @@ func (s *vfsShm) shmOpen() _ErrorCode {
 		if s.readOnly {
 			return _READONLY_CANTINIT
 		}
+		// Do not use a blocking lock here.
+		// If the lock cannot be obtained immediately,
+		// it means some other connection is truncating the file.
+		// And after it has done so, it will not release its lock,
+		// but only downgrade it to a shared lock.
+		// So no point in blocking here.
+		// The call below to obtain the shared DMS lock may use a blocking lock.
 		if rc := osWriteLock(s.File, _SHM_DMS, 1, 0); rc != _OK {
 			return rc
 		}
@@ -83,7 +92,7 @@ func (s *vfsShm) shmOpen() _ErrorCode {
 			return _IOERR_SHMOPEN
 		}
 	}
-	if rc := osReadLock(s.File, _SHM_DMS, 1, 0); rc != _OK {
+	if rc := osReadLock(s.File, _SHM_DMS, 1, time.Millisecond); rc != _OK {
 		return rc
 	}
 	return _OK
@@ -150,13 +159,18 @@ func (s *vfsShm) shmLock(offset, n int32, flags _ShmFlag) _ErrorCode {
 		panic(util.AssertErr())
 	}
 
+	var timeout time.Duration
+	if s.blocking {
+		timeout = time.Millisecond
+	}
+
 	switch {
 	case flags&_SHM_UNLOCK != 0:
 		return osUnlock(s.File, _SHM_BASE+int64(offset), int64(n))
 	case flags&_SHM_SHARED != 0:
-		return osReadLock(s.File, _SHM_BASE+int64(offset), int64(n), 0)
+		return osReadLock(s.File, _SHM_BASE+int64(offset), int64(n), timeout)
 	case flags&_SHM_EXCLUSIVE != 0:
-		return osWriteLock(s.File, _SHM_BASE+int64(offset), int64(n), 0)
+		return osWriteLock(s.File, _SHM_BASE+int64(offset), int64(n), timeout)
 	default:
 		panic(util.AssertErr())
 	}
@@ -181,3 +195,7 @@ func (s *vfsShm) shmUnmap(delete bool) {
 	s.Close()
 	s.File = nil
 }
+
+func (s *vfsShm) shmEnableBlocking(block bool) {
+	s.blocking = block
+}

vendor/github.com/ncruces/go-sqlite3/vfs/vfs.go

@@ -243,6 +243,15 @@ func vfsFileControl(ctx context.Context, mod api.Module, pFile uint32, op _Fcntl
 			return _OK
 		}
 
+	case _FCNTL_LOCK_TIMEOUT:
+		if file, ok := file.(FileSharedMemory); ok {
+			if iface, ok := file.SharedMemory().(interface{ shmEnableBlocking(bool) }); ok {
+				if i := util.ReadUint32(mod, pArg); i == 0 || i == 1 {
+					iface.shmEnableBlocking(i != 0)
+				}
+			}
+		}
+
 	case _FCNTL_PERSIST_WAL:
 		if file, ok := file.(FilePersistentWAL); ok {
 			if i := util.ReadUint32(mod, pArg); int32(i) >= 0 {
@@ -347,7 +356,7 @@ func vfsFileControl(ctx context.Context, mod api.Module, pFile uint32, op _Fcntl
 				out = err.Error()
 			}
 			if out != "" {
-				fn := mod.ExportedFunction("malloc")
+				fn := mod.ExportedFunction("sqlite3_malloc64")
 				stack := [...]uint64{uint64(len(out) + 1)}
 				if err := fn.CallWithStack(ctx, stack[:]); err != nil {
 					panic(err)