feat(functions): add chat completion functions

[robswei]

Added chat completion functions from latest openai-node v3.3.0

Ref: https://platform.openai.com/docs/guides/gpt/function-calling

[Zakinator123]

@rtweine2 Just curious, how did you go about generating the new code? Was trying to do the same, and found that the OpenAI OpenAPI generator was generating code that was structured differently than the code in this repo when I changed the OpenAPI generator to use typescript-fetch, and there's no instructions in this repo on how to go about generating new code from the latest OpenAPI spec that OpenAI puts out..

[henrycunh]

published this PR to openai-edge-fns npm package if anyone needs this ASAP

[dan-kwiat]

Thanks @rtweine2 !

[swyxio]

@Zakinator123 this isnt a complete answer but i think you can just pull it from openai-node openai/openai-node@b7cbca5

[abaybektursun]

New to react and next.js. How would I extract the function call here? res does not seem to have it

  const res = await openai.createChatCompletion({
    model: 'gpt-4',
    messages: messagesWithSystemPrompt,
    temperature: 0.0,
    stream: true
  })

  // log res
  console.log(res)
  
const stream = OpenAIStream(res, {
    async onCompletion(completion) {
      const title = json.messages[0].content.substring(0, 100)
      const id = json.id ?? nanoid()
      const createdAt = Date.now()
      const path = `/chat/${id}`
      const payload = {
        id,
        title,
        userId,
        createdAt,
        path,
        messages: [
          ...messages,
          {
            content: completion,
            role: 'assistant'
          }
        ]
      }
      await kv.hmset(`chat:${id}`, payload)
      await kv.zadd(`user:chat:${userId}`, {
        score: createdAt,
        member: `chat:${id}`
      })
    }
  })