XDel deletes a message from a stream. Returns true if the message was deleted. Returns false if the message was not deleted. Returns the number of messages in the stream after deletion. Parameters: name: The name of the stream. ids: The ID of the message to delete. Returns: bool: Indicates wh
(name string, ids string)
| 261 | // - It returns false if the message was not found in the stream. |
| 262 | // - It returns the number of messages in the stream after deletion. |
| 263 | func (s *StreamStructure) XDel(name string, ids string) (bool, int, error) { |
| 264 | // Get the stream |
| 265 | encodedStreams, err := s.db.Get([]byte(name)) |
| 266 | if err != nil { |
| 267 | return false, len(s.streams.Messages), err |
| 268 | } |
| 269 | |
| 270 | // Decode the streams |
| 271 | if err = s.decodeStreams(encodedStreams, s.streams); err != nil { |
| 272 | return false, len(s.streams.Messages), err |
| 273 | } |
| 274 | |
| 275 | // Get the messages |
| 276 | messages := s.streams.Messages |
| 277 | |
| 278 | // Create a new slice of StreamMessage |
| 279 | var result []*StreamMessage |
| 280 | |
| 281 | // Get the messages |
| 282 | found := false |
| 283 | for _, msg := range messages { |
| 284 | if msg.Id != ids { |
| 285 | result = append(result, msg) |
| 286 | } else { |
| 287 | found = true |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | if !found { |
| 292 | return false, len(s.streams.Messages), nil |
| 293 | } |
| 294 | |
| 295 | // Set the messages |
| 296 | s.streams.Messages = result |
| 297 | |
| 298 | // Encode the streams |
| 299 | encodedStreams, err = s.encodeStreams(s.streams) |
| 300 | if err != nil { |
| 301 | return false, len(s.streams.Messages), err |
| 302 | } |
| 303 | |
| 304 | // Set the stream |
| 305 | if err = s.db.Put([]byte(s.streams.Name), encodedStreams); err != nil { |
| 306 | return false, len(s.streams.Messages), err |
| 307 | } |
| 308 | |
| 309 | return true, len(s.streams.Messages), nil |
| 310 | } |
| 311 | |
| 312 | // XLen returns the number of elements in a given stream. |
| 313 | // It takes the name of the stream as an argument and returns the number of elements in the stream. |