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fix: correct context shift flag handling in LlamaCPP extension (#6404) (#6431)

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* fix: correct context shift flag handling in LlamaCPP extension

The previous implementation added the `--no-context-shift` flag when `cfg.ctx_shift` was disabled, which conflicted with the llama.cpp CLI where the presence of `--context-shift` enables the feature.
The logic is updated to push `--context-shift` only when `cfg.ctx_shift` is true, ensuring the extension passes the correct argument and behaves as expected.

* feat: detect model out of context during generation

---------

Co-authored-by: Dinh Long Nguyen <dinhlongviolin1@gmail.com>
This commit is contained in:
Akarshan Biswas 2025-09-12 13:43:31 +05:30 committed by GitHub
parent ad428f587b
commit 654e566dcb
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1 changed files with 20 additions and 2 deletions
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22
extensions/llamacpp-extension/src/index.ts
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@ -42,6 +42,9 @@ import {
} from '@janhq/tauri-plugin-llamacpp-api'
import { getSystemUsage, getSystemInfo } from '@janhq/tauri-plugin-hardware-api'
// Error message constant - matches web-app/src/utils/error.ts
const OUT_OF_CONTEXT_SIZE = 'the request exceeds the available context size.'
type LlamacppConfig = {
version_backend: string
auto_update_engine: boolean
@ -1541,7 +1544,7 @@ export default class llamacpp_extension extends AIEngine {
args.push('--main-gpu', String(cfg.main_gpu))
// Boolean flags
if (!cfg.ctx_shift) args.push('--no-context-shift')
if (cfg.ctx_shift) args.push('--context-shift')
if (Number(version.replace(/^b/, '')) >= 6325) {
if (!cfg.flash_attn) args.push('--flash-attn', 'off') //default: auto = ON when supported
} else {
@ -1739,6 +1742,13 @@ export default class llamacpp_extension extends AIEngine {
try {
const data = JSON.parse(jsonStr)
const chunk = data as chatCompletionChunk
// Check for out-of-context error conditions
if (chunk.choices?.[0]?.finish_reason === 'length') {
// finish_reason 'length' indicates context limit was hit
throw new Error(OUT_OF_CONTEXT_SIZE)
}
yield chunk
} catch (e) {
logger.error('Error parsing JSON from stream or server error:', e)
@ -1817,7 +1827,15 @@ export default class llamacpp_extension extends AIEngine {
)
}
return (await response.json()) as chatCompletion
const completionResponse = (await response.json()) as chatCompletion
// Check for out-of-context error conditions
if (completionResponse.choices?.[0]?.finish_reason === 'length') {
// finish_reason 'length' indicates context limit was hit
throw new Error(OUT_OF_CONTEXT_SIZE)
}
return completionResponse
}
override async delete(modelId: string): Promise<void> {