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151 changes: 151 additions & 0 deletions
151
packages/backend/server/src/plugins/copilot/controller.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,151 @@ | ||
| import { | ||
| BadRequestException, | ||
| Controller, | ||
| Get, | ||
| InternalServerErrorException, | ||
| Param, | ||
| Query, | ||
| Req, | ||
| Sse, | ||
| } from '@nestjs/common'; | ||
| import { | ||
| concatMap, | ||
| connect, | ||
| EMPTY, | ||
| from, | ||
| map, | ||
| merge, | ||
| Observable, | ||
| switchMap, | ||
| toArray, | ||
| } from 'rxjs'; | ||
|
|
||
| import { Public } from '../../core/auth'; | ||
| import { CurrentUser } from '../../core/auth/current-user'; | ||
| import { CopilotProviderService } from './providers'; | ||
| import { ChatSessionService } from './session'; | ||
| import { CopilotCapability } from './types'; | ||
|
|
||
| export interface ChatEvent { | ||
| data: string; | ||
| id?: string; | ||
| } | ||
|
|
||
| @Controller('/api/copilot') | ||
| export class CopilotController { | ||
| constructor( | ||
| private readonly chatSession: ChatSessionService, | ||
| private readonly provider: CopilotProviderService | ||
| ) {} | ||
|
|
||
| @Public() | ||
| @Get('/chat/:sessionId') | ||
| async chat( | ||
| @CurrentUser() user: CurrentUser, | ||
| @Req() req: Request, | ||
| @Param('sessionId') sessionId: string, | ||
| @Query('message') content: string, | ||
| @Query() params: Record<string, string | string[]> | ||
| ): Promise<string> { | ||
| const provider = this.provider.getProviderByCapability( | ||
| CopilotCapability.TextToText | ||
| ); | ||
| if (!provider) { | ||
| throw new InternalServerErrorException('No provider available'); | ||
| } | ||
| const session = await this.chatSession.get(sessionId); | ||
| if (!session) { | ||
| throw new BadRequestException('Session not found'); | ||
| } | ||
| if (!content || !content.trim()) { | ||
| throw new BadRequestException('Message is empty'); | ||
| } | ||
| session.push({ | ||
| role: 'user', | ||
| content: decodeURIComponent(content), | ||
| createdAt: new Date(), | ||
| }); | ||
|
|
||
| try { | ||
| delete params.message; | ||
| const content = await provider.generateText( | ||
| session.finish(params), | ||
| session.model, | ||
| { | ||
| signal: req.signal, | ||
| user: user.id, | ||
| } | ||
| ); | ||
|
|
||
| session.push({ | ||
| role: 'assistant', | ||
| content, | ||
| createdAt: new Date(), | ||
| }); | ||
| await session.save(); | ||
|
|
||
| return content; | ||
| } catch (e: any) { | ||
| throw new InternalServerErrorException( | ||
| e.message || "Couldn't generate text" | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| @Public() | ||
| @Sse('/chat/:sessionId/stream') | ||
| async chatStream( | ||
| @CurrentUser() user: CurrentUser, | ||
| @Req() req: Request, | ||
| @Param('sessionId') sessionId: string, | ||
| @Query('message') content: string, | ||
| @Query() params: Record<string, string> | ||
| ): Promise<Observable<ChatEvent>> { | ||
| const provider = this.provider.getProviderByCapability( | ||
| CopilotCapability.TextToText | ||
| ); | ||
| if (!provider) { | ||
| throw new InternalServerErrorException('No provider available'); | ||
| } | ||
| const session = await this.chatSession.get(sessionId); | ||
| if (!session) { | ||
| throw new BadRequestException('Session not found'); | ||
| } | ||
| if (!content || !content.trim()) { | ||
| throw new BadRequestException('Message is empty'); | ||
| } | ||
| session.push({ | ||
| role: 'user', | ||
| content: decodeURIComponent(content), | ||
| createdAt: new Date(), | ||
| }); | ||
|
|
||
| delete params.message; | ||
| return from( | ||
| provider.generateTextStream(session.finish(params), session.model, { | ||
| signal: req.signal, | ||
| user: user.id, | ||
| }) | ||
| ).pipe( | ||
| connect(shared$ => | ||
| merge( | ||
| // actual chat event stream | ||
| shared$.pipe(map(data => ({ id: sessionId, data }))), | ||
| // save the generated text to the session | ||
| shared$.pipe( | ||
| toArray(), | ||
| concatMap(values => { | ||
| session.push({ | ||
| role: 'assistant', | ||
| content: values.join(''), | ||
| createdAt: new Date(), | ||
| }); | ||
| return from(session.save()); | ||
| }), | ||
| switchMap(() => EMPTY) | ||
| ) | ||
| ) | ||
| ) | ||
| ); | ||
| } | ||
| } |
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