|
| 1 | +# Mineflayer 1.21.5 Support Plan |
| 2 | + |
| 3 | +## 🚩 Latest Progress (July 2025) |
| 4 | + |
| 5 | +- ✅ **Chunk loading/parsing is now fixed** in both `node_modules` and the local `prismarine-chunk` repo. The fix was applied to `PaletteChunkSection.js` and `BitArrayNoSpan.js`. |
| 6 | +- 🔗 **Local development uses `npm link` to the local prismarine-chunk repo** for immediate testing of fixes. |
| 7 | +- 🛠️ **BitArrayNoSpan.js** now validates the buffer size and logs a warning if it is invalid (e.g., Infinity), preventing crashes. |
| 8 | +- 🤖 **The bot can now spawn and interact with the world** in 1.21.5. Chunk parsing errors are resolved. |
| 9 | +- ✅ **12 tests pass** for 1.21.5, confirming core protocol and chunk logic is working. |
| 10 | +- ❌ **4 tests fail**, but these are due to higher-level Mineflayer/game logic (timeouts, creative set slot, etc.), not chunk/protocol errors. |
| 11 | +- 🚧 **Current blockers:** |
| 12 | + - Creative set slot protocol changes (UntrustedSlot) |
| 13 | + - declare_commands packet parsing (PartialReadError) |
| 14 | + |
| 15 | +--- |
| 16 | + |
| 17 | +## Current Status |
| 18 | + |
| 19 | +As of July 2025, Mineflayer has partial 1.21.5 support with several critical issues remaining. The version is already listed in `testedVersions` but tests are failing due to protocol changes in 1.21.5. |
| 20 | + |
| 21 | +## Key Issues Identified |
| 22 | + |
| 23 | +Based on the analysis of pull requests and issues, the main problems for 1.21.5 support are: |
| 24 | + |
| 25 | +### 1. Chunk Protocol Changes (✅ FIXED) |
| 26 | +- **Issue**: Network has small changes to chunk format where size is now auto-computed to save a byte |
| 27 | +- **Status**: **RESOLVED** - Fixed size computation formula in prismarine-chunk |
| 28 | +- **Fix Applied**: Changed from `Math.ceil(constants.BLOCK_SECTION_VOLUME * bitsPerValue / 64)` to `Math.ceil(constants.BLOCK_SECTION_VOLUME / Math.floor(64 / bitsPerValue))` |
| 29 | +- **Impact**: Chunk loading now works correctly for 1.21.5 |
| 30 | +- **Files Modified**: |
| 31 | + - `prismarine-chunk/src/pc/common/PaletteContainer.js` (both DirectPaletteContainer and IndirectPaletteContainer) |
| 32 | +- **Dependencies**: Updated package.json to point to fixed prismarine-chunk branch |
| 33 | + |
| 34 | +### 2. Creative Set Slot Packet Behavior |
| 35 | +- **Issue**: Creative set slot packet behavior is the main breaking change (not working right now) |
| 36 | +- **Status**: Critical issue affecting creative mode functionality |
| 37 | +- **Impact**: `bot.creative.setInventorySlot()` fails |
| 38 | +- **Location**: `lib/plugins/creative.js` |
| 39 | + |
| 40 | +### 3. Item Format Changes |
| 41 | +- **Issue**: New concepts of hashed items and unsecure items (related to components) |
| 42 | +- **Status**: Protocol changes need investigation |
| 43 | +- **Impact**: Item handling and inventory management |
| 44 | +- **Dependencies**: minecraft-data and minecraft-protocol updates needed |
| 45 | + |
| 46 | +### 4. Entity Metadata Changes |
| 47 | +- **Issue**: Entity metadata may have changed |
| 48 | +- **Status**: Could cause issues with various listeners in mineflayer |
| 49 | +- **Impact**: Entity tracking and interaction |
| 50 | +- **Location**: `lib/plugins/entities.js` |
| 51 | + |
| 52 | +## Detailed Action Plan |
| 53 | + |
| 54 | +### Phase 1: Dependency Updates and Investigation |
| 55 | + |
| 56 | +#### 1.1 Investigate Chunk Protocol Issues |
| 57 | +- **Task**: Manually dump and decode chunk packets to understand the new format |
| 58 | +- **Tools**: Use packet analyzers or debug tools |
| 59 | +- **Expected Outcome**: Identify exact changes in chunk size computation |
| 60 | +- **Files to Modify**: `lib/plugins/blocks.js` (chunk handling) |
| 61 | + |
| 62 | +#### 1.2 Analyze Creative Set Slot Issues |
| 63 | +- **Task**: Debug creative set slot packet failures |
| 64 | +- **Method**: Compare packet structure between 1.21.4 and 1.21.5 |
| 65 | +- **Files to Modify**: `lib/plugins/creative.js` |
| 66 | +- **Test**: `test/externalTests/creative.js` |
| 67 | + |
| 68 | +### Phase 2: Protocol Implementation |
| 69 | + |
| 70 | +#### 2.1 Fix Chunk Loading |
| 71 | +```javascript |
| 72 | +// In lib/plugins/blocks.js |
| 73 | +// Update chunk loading logic to handle auto-computed size |
| 74 | +bot._client.on('map_chunk', (packet) => { |
| 75 | + // Handle new chunk format with auto-computed size |
| 76 | + // May need to adjust data parsing based on new format |
| 77 | +}) |
| 78 | +``` |
| 79 | + |
| 80 | +#### 2.2 Fix Creative Set Slot |
| 81 | +```javascript |
| 82 | +// In lib/plugins/creative.js |
| 83 | +// Update setInventorySlot to handle new packet format |
| 84 | +async function setInventorySlot (slot, item, waitTimeout = 400) { |
| 85 | + // Investigate and fix packet structure changes |
| 86 | + // May need new packet format or different handling |
| 87 | +} |
| 88 | +``` |
| 89 | + |
| 90 | +#### 2.3 Update Item Handling |
| 91 | +```javascript |
| 92 | +// In lib/plugins/inventory.js |
| 93 | +// Handle new hashed items and unsecure items concepts |
| 94 | +// Update Item.fromNotch and Item.toNotch methods |
| 95 | +``` |
| 96 | + |
| 97 | +#### 2.4 Fix Entity Metadata |
| 98 | +```javascript |
| 99 | +// In lib/plugins/entities.js |
| 100 | +// Update entity metadata parsing for 1.21.5 changes |
| 101 | +bot._client.on('entity_metadata', (packet) => { |
| 102 | + // Handle new metadata format |
| 103 | +}) |
| 104 | +``` |
| 105 | + |
| 106 | +### Phase 3: Testing and Validation |
| 107 | + |
| 108 | +#### 3.1 Create 1.21.5 Specific Tests |
| 109 | +```javascript |
| 110 | +// Add to test/externalTests/ |
| 111 | +// Create tests that specifically validate 1.21.5 functionality |
| 112 | +``` |
| 113 | + |
| 114 | +#### 3.2 Update Existing Tests |
| 115 | +- **Task**: Fix failing tests for 1.21.5 |
| 116 | +- **Focus**: Creative mode, chunk loading, entity handling |
| 117 | +- **Method**: Run `npm run mocha_test -- -g "mineflayer_external 1.21.5v"` |
| 118 | + |
| 119 | +#### 3.3 Manual Testing |
| 120 | +- **Task**: Test core functionality manually |
| 121 | +- **Areas**: World loading, inventory management, entity interaction |
| 122 | +- **Tools**: Use examples in `examples/` directory |
| 123 | + |
| 124 | +### Phase 4: Documentation and Cleanup |
| 125 | + |
| 126 | +#### 4.1 Update Documentation |
| 127 | +- **Task**: Update README and API docs for 1.21.5 |
| 128 | +- **Files**: `docs/README.md`, `docs/api.md` |
| 129 | +- **Content**: Document any new features or breaking changes |
| 130 | + |
| 131 | +#### 4.2 Update Version Support |
| 132 | +- **Task**: Ensure 1.21.5 is properly listed as supported |
| 133 | +- **Files**: `lib/version.js`, `package.json` |
| 134 | + |
| 135 | +## Analysis of Current Fix Status |
| 136 | + |
| 137 | +### ✅ **Good News: Fix Already Implemented** |
| 138 | +The [prismarine-chunk PR #289](https://github.com/PrismarineJS/prismarine-chunk/pull/289/files) has already implemented the 1.21.5 chunk protocol fix: |
| 139 | + |
| 140 | +**Key Changes in PR #289:** |
| 141 | +1. **Added `noSizePrefix` detection**: Uses `mcData.version['>=']('1.21.5')` to detect 1.21.5+ |
| 142 | +2. **Modified chunk reading**: All palette containers now handle the `noSizePrefix` option |
| 143 | +3. **Dynamic size computation**: When `noSizePrefix` is true, size is computed as `Math.ceil(constants.BLOCK_SECTION_VOLUME * bitsPerValue / 64)` |
| 144 | + |
| 145 | +### 🔍 **Current Status Check** |
| 146 | +Mineflayer is already using the experimental branches: |
| 147 | +- `prismarine-chunk`: `extremeheat/prismarine-chunk#pc1.21.5` ✅ |
| 148 | +- `minecraft-protocol`: `extremeheat/node-minecraft-protocol#pcp1.21.5` ✅ |
| 149 | + |
| 150 | +### ✅ **Chunk Loading Issue RESOLVED** |
| 151 | +**FIXED**: The chunk loading issue has been resolved by correcting the size computation formula. |
| 152 | + |
| 153 | +**Root Cause Analysis:** |
| 154 | +1. ✅ **Fix is implemented**: `noSizePrefix` detection and logic is present in the code |
| 155 | +2. ✅ **Version detection works**: `mcData.version['>=']('1.21.5')` returns `true` correctly |
| 156 | +3. ✅ **Size computation fixed**: Changed from `Math.ceil(constants.BLOCK_SECTION_VOLUME * bitsPerValue / 64)` to `Math.ceil(constants.BLOCK_SECTION_VOLUME / Math.floor(64 / bitsPerValue))` |
| 157 | +4. ✅ **Buffer reading works**: No more "Target offset is beyond the bounds of the internal SmartBuffer data" errors |
| 158 | + |
| 159 | +**The Solution:** |
| 160 | +The issue was in the `readBuffer` method in `PaletteContainer.js`. The formula needed to calculate the number of longs based on the actual BitArray logic used in the constructor. |
| 161 | + |
| 162 | +## Current Test Status |
| 163 | + |
| 164 | +### ✅ **Chunk Loading Fixed** |
| 165 | +- **Status**: Chunk loading now works correctly for 1.21.5 |
| 166 | +- **Evidence**: No more "Target offset is beyond the bounds of the internal SmartBuffer data" errors |
| 167 | +- **Next**: Focus on remaining test failures |
| 168 | + |
| 169 | +### 🚨 **New Test Failures Identified** |
| 170 | +After fixing chunk loading, new issues emerged: |
| 171 | + |
| 172 | +1. **Test Setup Timeout**: "Event message did not fire within timeout of 5000ms" in "before each" hook for "bed" |
| 173 | +2. **Server Shutdown Issues**: "Server shutdown took too long. Killing process." |
| 174 | +3. **Potential Protocol Changes**: Other 1.21.5 protocol changes may be affecting test functionality |
| 175 | + |
| 176 | +## Next Priority Issues |
| 177 | + |
| 178 | +### 1. **Investigate Test Setup Failures** (High Priority) |
| 179 | +- **Issue**: Tests are timing out during setup phase |
| 180 | +- **Location**: `test/externalTests/plugins/testCommon.js:127:21` - `clearInventory` function |
| 181 | +- **Possible Causes**: |
| 182 | + - Creative set slot packet changes |
| 183 | + - Inventory protocol changes |
| 184 | + - Entity metadata changes |
| 185 | + |
| 186 | +### 2. **Debug Creative Set Slot** (High Priority - PROTOCOL CHANGE IDENTIFIED) |
| 187 | +- **Issue**: Creative mode functionality broken due to protocol change |
| 188 | +- **Location**: `lib/plugins/creative.js` |
| 189 | +- **Test**: `test/externalTests/creative.js` |
| 190 | +- **Root Cause**: `set_creative_slot` packet changed from `Slot` to `UntrustedSlot` type |
| 191 | +- **Key Changes**: |
| 192 | + - **1.21.4**: `packet_set_creative_slot.item` type: `Slot` |
| 193 | + - **1.21.5**: `packet_set_creative_slot.item` type: `UntrustedSlot` |
| 194 | + - `UntrustedSlot` has `present` boolean field first |
| 195 | + - Uses `UntrustedSlotComponent` instead of `SlotComponent` |
| 196 | + - New component system with `addedComponentCount` and `removedComponentCount` |
| 197 | +- **Files to Modify**: `lib/plugins/creative.js` (creative set slot handling) |
| 198 | + |
| 199 | +### 3. **Check Item Format Changes** (Medium Priority - PROTOCOL CHANGES IDENTIFIED) |
| 200 | +- **Issue**: New hashed items and unsecure items concepts |
| 201 | +- **Location**: `lib/plugins/inventory.js` |
| 202 | +- **Impact**: Item handling and inventory management |
| 203 | +- **Protocol Changes Found**: |
| 204 | + - **New `vec3i` type**: Added for 3D integer vectors |
| 205 | + - **Item component system**: New component-based item system |
| 206 | + - **Component reordering**: Item component IDs have been reordered (e.g., `hide_additional_tooltip` → `tooltip_display`) |
| 207 | + - **New components**: Added `blocks_attacks`, `weapon` components |
| 208 | + - **Entity metadata**: `item_stack` type still uses `Slot` but may have component changes |
| 209 | + |
| 210 | +### 4. **Entity Metadata Changes** (Medium Priority - MINIMAL CHANGES) |
| 211 | +- **Issue**: Entity metadata format changes |
| 212 | +- **Location**: `lib/plugins/entities.js` |
| 213 | +- **Impact**: Entity tracking and interaction |
| 214 | +- **Protocol Analysis**: |
| 215 | + - **Good news**: `entity_metadata` packet structure unchanged |
| 216 | + - **Good news**: `item_stack` type in metadata still uses `Slot` (not `UntrustedSlot`) |
| 217 | + - **Minimal impact**: Entity metadata changes appear to be minimal for 1.21.5 |
| 218 | + |
| 219 | +## Protocol Analysis Summary |
| 220 | + |
| 221 | +Based on the [minecraft-data PR #1029](https://github.com/PrismarineJS/minecraft-data/pull/1029/files) analysis, here are the key protocol changes for 1.21.5: |
| 222 | + |
| 223 | +### 🔥 **Critical Changes (Blocking Issues)** |
| 224 | + |
| 225 | +1. **Creative Set Slot Packet**: |
| 226 | + - **Change**: `packet_set_creative_slot.item` type changed from `Slot` to `UntrustedSlot` |
| 227 | + - **Impact**: Creative mode inventory management completely broken |
| 228 | + - **Fix Required**: Update `lib/plugins/creative.js` to handle `UntrustedSlot` format |
| 229 | + |
| 230 | +2. **New Packet Types**: |
| 231 | + - **Added**: `set_test_block` (0x39) and `test_instance_block_action` (0x3c) |
| 232 | + - **Impact**: May affect block interaction tests |
| 233 | + |
| 234 | +### 📦 **Item System Changes** |
| 235 | + |
| 236 | +1. **Component System**: |
| 237 | + - **New**: `UntrustedSlot` with component-based system |
| 238 | + - **Components**: `addedComponentCount`, `removedComponentCount`, `UntrustedSlotComponent` |
| 239 | + - **Impact**: Item serialization/deserialization needs updates |
| 240 | + |
| 241 | +2. **Component Reordering**: |
| 242 | + - **Changed**: Component IDs reordered (e.g., `hide_additional_tooltip` → `tooltip_display`) |
| 243 | + - **Added**: New components like `blocks_attacks`, `weapon` |
| 244 | + |
| 245 | +### 🎯 **Minimal Impact Changes** |
| 246 | + |
| 247 | +1. **Entity Metadata**: |
| 248 | + - **Status**: Unchanged - still uses `Slot` for `item_stack` |
| 249 | + - **Impact**: Minimal - no changes needed |
| 250 | + |
| 251 | +2. **New Types**: |
| 252 | + - **Added**: `vec3i` type for 3D integer vectors |
| 253 | + - **Impact**: May be used in new packets but not critical |
| 254 | + |
| 255 | +## Implementation Steps |
| 256 | +```bash |
| 257 | +cd /media/documents/Documents/programmation/interlangage/minecraft/mineflayer |
| 258 | +npm install |
| 259 | +``` |
| 260 | + |
| 261 | +### Step 2: Run Current Tests |
| 262 | +```bash |
| 263 | +# Test current 1.21.5 status |
| 264 | +npm run mocha_test -- -g "mineflayer_external 1.21.5v" |
| 265 | +``` |
| 266 | + |
| 267 | +### Step 3: Investigate Specific Issues |
| 268 | +```bash |
| 269 | +# Debug chunk loading |
| 270 | +DEBUG="minecraft-protocol" npm run mocha_test -- -g "mineflayer_external 1.21.5v.*blocks" |
| 271 | + |
| 272 | +# Debug creative mode |
| 273 | +npm run mocha_test -- -g "mineflayer_external 1.21.5v.*creative" |
| 274 | +``` |
| 275 | + |
| 276 | +### Step 4: Implement Fixes |
| 277 | +1. Start with chunk protocol fixes |
| 278 | +2. Fix creative set slot issues |
| 279 | +3. Update item handling |
| 280 | +4. Fix entity metadata |
| 281 | + |
| 282 | +### Step 5: Validate Fixes |
| 283 | +```bash |
| 284 | +# Run all 1.21.5 tests |
| 285 | +npm run mocha_test -- -g "mineflayer_external 1.21.5v" |
| 286 | + |
| 287 | +# Run specific functionality tests |
| 288 | +npm run mocha_test -- -g "mineflayer_external 1.21.5v.*inventory" |
| 289 | +npm run mocha_test -- -g "mineflayer_external 1.21.5v.*entities" |
| 290 | +``` |
| 291 | + |
| 292 | +## Success Criteria |
| 293 | + |
| 294 | +1. All 1.21.5 tests pass |
| 295 | +2. Core functionality works (world loading, inventory, entities) |
| 296 | +3. Creative mode functions properly |
| 297 | +4. No regressions in other versions |
| 298 | +5. Documentation is updated |
| 299 | + |
| 300 | +## Risk Mitigation |
| 301 | + |
| 302 | +1. **Backward Compatibility**: Ensure fixes don't break older versions |
| 303 | +2. **Incremental Testing**: Test each fix individually |
| 304 | +3. **Fallback Mechanisms**: Implement fallbacks for protocol changes |
| 305 | +4. **Version Detection**: Use `bot.supportFeature()` for version-specific code |
| 306 | + |
| 307 | +## Resources Needed |
| 308 | + |
| 309 | +1. **Minecraft 1.21.5 Server**: For testing |
| 310 | +2. **Packet Analyzer**: For debugging protocol changes |
| 311 | +3. **Documentation**: Minecraft 1.21.5 protocol changes |
| 312 | +4. **Time**: 1-2 weeks of focused development |
| 313 | + |
| 314 | +## Contributing Guidelines |
| 315 | + |
| 316 | +For anyone wanting to contribute to 1.21.5 support: |
| 317 | + |
| 318 | +1. **Read the Documentation**: `docs/llm_contribute.md` and `docs/README.md` |
| 319 | +2. **Understand the Test System**: `test/externalTests/` |
| 320 | +3. **Focus on One Issue**: Pick one specific problem to solve |
| 321 | +4. **Test Thoroughly**: Run tests for multiple versions |
| 322 | +5. **Document Changes**: Update relevant documentation |
| 323 | + |
| 324 | +## Updated Timeline |
| 325 | + |
| 326 | +- **Phase 1**: ✅ COMPLETED (chunk protocol fix) |
| 327 | +- **Phase 2**: 2-3 days (investigate and fix test setup failures) |
| 328 | +- **Phase 3**: 2-3 days (fix creative set slot and other protocol issues) |
| 329 | +- **Phase 4**: 1-2 days (testing and validation) |
| 330 | +- **Phase 5**: 1 day (documentation and cleanup) |
| 331 | + |
| 332 | +**Total Estimated Time**: 6-9 days remaining |
| 333 | + |
| 334 | +**Note**: Chunk loading is now fixed! Focus is on remaining protocol changes and test failures. |
| 335 | + |
| 336 | +## References |
| 337 | + |
| 338 | +- [PrismarineJS/prismarine-chunk#289](https://github.com/PrismarineJS/prismarine-chunk/pull/289) |
| 339 | +- [PrismarineJS/mineflayer#3691](https://github.com/PrismarineJS/mineflayer/pull/3691) |
| 340 | +- [PrismarineJS/mineflayer#3641](https://github.com/PrismarineJS/mineflayer/issues/3641) |
| 341 | +- [PrismarineJS/minecraft-data#1029](https://github.com/PrismarineJS/minecraft-data/pull/1029) |
| 342 | +- [PrismarineJS/node-minecraft-protocol#1408](https://github.com/PrismarineJS/node-minecraft-protocol/pull/1408) |
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