mirror of
https://github.com/EchoVault/SugarDB.git
synced 2025-11-03 10:21:00 +08:00
Added emebedded API methods to change Protocol and logical DB. Added comments to SwapDBs and Flush methods.
This commit is contained in:
Kelvin Mwinuka
@@ -13,3 +13,58 @@
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// limitations under the License.
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package echovault
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import (
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"errors"
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"slices"
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)
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// SetProtocol sets the RESP protocol that's expected from responses to embedded API calls.
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// This command does not affect the RESP protocol expected by any of the TCP clients.
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//
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// Parameters:
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//
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// `protocol` - int - The RESP version (either 2 or 3).
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//
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// Errors:
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//
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// "protocol must be either 2 or 3" - When the provided protocol is not either 2 or 3.
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func (server *EchoVault) SetProtocol(protocol int) error {
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if !slices.Contains([]int{2, 3}, protocol) {
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return errors.New("protocol must be either 2 or 3")
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}
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server.connInfo.mut.Lock()
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defer server.connInfo.mut.Unlock()
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server.connInfo.embedded.Protocol = protocol
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return nil
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}
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// SelectDB sets the logical database to use for all embedded API calls.
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// All subsequent calls after this call will use the new logical database.
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// This does not affect the databases used by any of the TCP clients.
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//
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// Parameters:
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//
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// `database` - int - The Database index.
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//
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// Errors:
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//
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// "database index must be 0 or higher" - When the database index is less than 0.
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func (server *EchoVault) SelectDB(database int) error {
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if database < 0 {
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return errors.New("database index must be 0 or higher")
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}
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// If the database index does not exist, create the new database.
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server.storeLock.Lock()
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if server.store[database] == nil {
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server.createDatabase(database)
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}
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server.storeLock.Unlock()
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// Set the DB.
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server.connInfo.mut.Lock()
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defer server.connInfo.mut.Unlock()
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server.connInfo.embedded.Database = database
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return nil
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}
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@@ -28,6 +28,87 @@ import (
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"time"
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)
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// SwapDBs swaps every TCP client connection from database1 over to database2.
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// It also swaps every TCP client connection from database2 over to database1.
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// This only affects TCP connections, it does not swap the logical database currently
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// being used by the embedded API.
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func (server *EchoVault) SwapDBs(database1, database2 int) {
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// If the databases are the same, skip the swap.
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if database1 == database2 {
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return
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}
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// If any of the databases does not exist, create them.
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server.storeLock.Lock()
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for _, database := range []int{database1, database2} {
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if server.store[database] == nil {
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server.createDatabase(database)
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}
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}
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server.storeLock.Unlock()
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// Swap the connections for each database.
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server.connInfo.mut.Lock()
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defer server.connInfo.mut.Unlock()
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for connection, info := range server.connInfo.tcpClients {
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switch info.Database {
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case database1:
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server.connInfo.tcpClients[connection] = internal.ConnectionInfo{
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Id: info.Id,
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Name: info.Name,
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Protocol: info.Protocol,
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Database: database2,
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}
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case database2:
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server.connInfo.tcpClients[connection] = internal.ConnectionInfo{
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Id: info.Id,
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Name: info.Name,
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Protocol: info.Protocol,
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Database: database1,
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}
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}
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}
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}
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// Flush flushes all the data from the database at the specified index.
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// When -1 is passed, all the logical databases are cleared.
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func (server *EchoVault) Flush(database int) {
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server.storeLock.Lock()
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defer server.storeLock.Unlock()
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server.keysWithExpiry.rwMutex.Lock()
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defer server.keysWithExpiry.rwMutex.Unlock()
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server.lfuCache.mutex.Lock()
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defer server.lfuCache.mutex.Unlock()
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server.lruCache.mutex.Lock()
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defer server.lruCache.mutex.Unlock()
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if database == -1 {
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for db, _ := range server.store {
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// Clear db store.
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clear(server.store[db])
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// Clear db volatile key tracker.
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clear(server.keysWithExpiry.keys[db])
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// Clear db LFU cache.
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server.lfuCache.cache[db] = eviction.NewCacheLFU()
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// Clear db LRU cache.
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server.lruCache.cache[db] = eviction.NewCacheLRU()
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}
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return
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}
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// Clear db store.
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clear(server.store[database])
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// Clear db volatile key tracker.
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clear(server.keysWithExpiry.keys[database])
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// Clear db LFU cache.
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server.lfuCache.cache[database] = eviction.NewCacheLFU()
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// Clear db LRU cache.
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server.lruCache.cache[database] = eviction.NewCacheLRU()
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}
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func (server *EchoVault) keysExist(ctx context.Context, keys []string) map[string]bool {
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server.storeLock.RLock()
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defer server.storeLock.RUnlock()
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@@ -227,81 +308,6 @@ func (server *EchoVault) createDatabase(database int) {
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server.lruCache.cache[database] = eviction.NewCacheLRU()
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}
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func (server *EchoVault) SwapDBs(database1, database2 int) {
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// If the databases are the same, skip the swap.
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if database1 == database2 {
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return
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}
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// If any of the databases does not exist, create them.
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server.storeLock.Lock()
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for _, database := range []int{database1, database2} {
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if server.store[database] == nil {
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server.createDatabase(database)
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}
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}
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server.storeLock.Unlock()
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// Swap the connections for each database.
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server.connInfo.mut.Lock()
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defer server.connInfo.mut.Unlock()
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for connection, info := range server.connInfo.tcpClients {
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switch info.Database {
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case database1:
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server.connInfo.tcpClients[connection] = internal.ConnectionInfo{
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Id: info.Id,
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Name: info.Name,
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Protocol: info.Protocol,
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Database: database2,
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}
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case database2:
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server.connInfo.tcpClients[connection] = internal.ConnectionInfo{
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Id: info.Id,
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Name: info.Name,
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Protocol: info.Protocol,
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Database: database1,
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}
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}
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}
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}
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func (server *EchoVault) Flush(database int) {
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server.storeLock.Lock()
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defer server.storeLock.Unlock()
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server.keysWithExpiry.rwMutex.Lock()
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defer server.keysWithExpiry.rwMutex.Unlock()
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server.lfuCache.mutex.Lock()
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defer server.lfuCache.mutex.Unlock()
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server.lruCache.mutex.Lock()
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defer server.lruCache.mutex.Unlock()
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if database == -1 {
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for db, _ := range server.store {
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// Clear db store.
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clear(server.store[db])
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// Clear db volatile key tracker.
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clear(server.keysWithExpiry.keys[db])
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// Clear db LFU cache.
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server.lfuCache.cache[db] = eviction.NewCacheLFU()
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// Clear db LRU cache.
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server.lruCache.cache[db] = eviction.NewCacheLRU()
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}
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return
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}
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// Clear db store.
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clear(server.store[database])
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// Clear db volatile key tracker.
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clear(server.keysWithExpiry.keys[database])
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// Clear db LFU cache.
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server.lfuCache.cache[database] = eviction.NewCacheLFU()
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// Clear db LRU cache.
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server.lruCache.cache[database] = eviction.NewCacheLRU()
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}
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func (server *EchoVault) getState() map[int]map[string]interface{} {
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// Wait unit there's no state mutation or copy in progress before starting a new copy process.
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for {
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