114 lines
3.1 KiB
TypeScript
114 lines
3.1 KiB
TypeScript
import { OpenAIClient } from './OpenAIClient'
|
|
import { DEFAULT_TEMPERATURE, LLM_MAX_RETRIES } from './constants'
|
|
import { InvokeError, InvokeErrorType } from './errors'
|
|
import type { InvokeOptions, InvokeResult, LLMClient, LLMConfig, Message, Tool } from './types'
|
|
|
|
export { InvokeError, InvokeErrorType }
|
|
export type { InvokeOptions, InvokeResult, LLMClient, LLMConfig, Message, Tool }
|
|
|
|
export function parseLLMConfig(config: LLMConfig): Required<LLMConfig> {
|
|
// Runtime validation as defensive programming (types already guarantee these)
|
|
if (!config.baseURL || !config.model) {
|
|
throw new Error(
|
|
'[PageAgent] LLM configuration required. Please provide: baseURL, model. ' +
|
|
'See: https://alibaba.github.io/page-agent/docs/features/models'
|
|
)
|
|
}
|
|
|
|
return {
|
|
baseURL: config.baseURL,
|
|
model: config.model,
|
|
apiKey: config.apiKey || '',
|
|
temperature: config.temperature ?? DEFAULT_TEMPERATURE,
|
|
maxRetries: config.maxRetries ?? LLM_MAX_RETRIES,
|
|
disableNamedToolChoice: config.disableNamedToolChoice ?? false,
|
|
customFetch: (config.customFetch ?? fetch).bind(globalThis), // fetch will be illegal unless bound
|
|
}
|
|
}
|
|
|
|
export class LLM extends EventTarget {
|
|
config: Required<LLMConfig>
|
|
client: LLMClient
|
|
|
|
constructor(config: LLMConfig) {
|
|
super()
|
|
this.config = parseLLMConfig(config)
|
|
|
|
// Default to OpenAI client
|
|
this.client = new OpenAIClient(this.config)
|
|
}
|
|
|
|
/**
|
|
* - call llm api *once*
|
|
* - invoke tool call *once*
|
|
* - return the result of the tool
|
|
*/
|
|
async invoke(
|
|
messages: Message[],
|
|
tools: Record<string, Tool>,
|
|
abortSignal: AbortSignal,
|
|
options?: InvokeOptions
|
|
): Promise<InvokeResult> {
|
|
return await withRetry(
|
|
async () => {
|
|
// in case user aborted before invoking
|
|
if (abortSignal.aborted) throw new Error('AbortError')
|
|
|
|
const result = await this.client.invoke(messages, tools, abortSignal, options)
|
|
|
|
return result
|
|
},
|
|
// retry settings
|
|
{
|
|
maxRetries: this.config.maxRetries,
|
|
onRetry: (attempt: number) => {
|
|
this.dispatchEvent(
|
|
new CustomEvent('retry', { detail: { attempt, maxAttempts: this.config.maxRetries } })
|
|
)
|
|
},
|
|
onError: (error: Error) => {
|
|
this.dispatchEvent(new CustomEvent('error', { detail: { error } }))
|
|
},
|
|
}
|
|
)
|
|
}
|
|
}
|
|
|
|
async function withRetry<T>(
|
|
fn: () => Promise<T>,
|
|
settings: {
|
|
maxRetries: number
|
|
onRetry: (attempt: number) => void
|
|
onError: (error: Error) => void
|
|
}
|
|
): Promise<T> {
|
|
let attempt = 0
|
|
let lastError: Error | null = null
|
|
while (attempt <= settings.maxRetries) {
|
|
if (attempt > 0) {
|
|
settings.onRetry(attempt)
|
|
await new Promise((resolve) => setTimeout(resolve, 100))
|
|
}
|
|
|
|
try {
|
|
return await fn()
|
|
} catch (error: unknown) {
|
|
// do not retry if aborted by user
|
|
if ((error as any)?.rawError?.name === 'AbortError') throw error
|
|
|
|
console.error(error)
|
|
settings.onError(error as Error)
|
|
|
|
// do not retry if error is not retryable (InvokeError)
|
|
if (error instanceof InvokeError && !error.retryable) throw error
|
|
|
|
lastError = error as Error
|
|
attempt++
|
|
|
|
await new Promise((resolve) => setTimeout(resolve, 100))
|
|
}
|
|
}
|
|
|
|
throw lastError!
|
|
}
|