how to stream to google chat?

[macrozone]

i implemented a Chat Bot using a http-endpoint like described here https://developers.google.com/chat/quickstart/gcf-app

With this, you can return a message as response:

res.send({
  text: 'Hi user!',
})

Anyone knows how to stream the response from the chain using this approach?

i already asked this question on stack overflow, since it seems to be completly unknown to the internet ;-)

https://stackoverflow.com/questions/77473078/how-can-i-stream-a-response-from-a-language-model-to-google-chat

[dosubot[bot]]

🤖

To stream a response from a language model to Google Chat using the LangChain Javascript framework, you would need to use the stream method of the ChatCloudflareWorkersAI class or ChatOpenAI class, depending on the model you are using. This method returns an asynchronous iterable that you can loop over to get chunks of the response.

Here's an example of how you can do this:

import { PromptTemplate } from "langchain/prompts";
import { ChatCloudflareWorkersAI } from "langchain/chat_models/cloudflare_workersai";

const model = new ChatCloudflareWorkersAI({});
const promptTemplate = PromptTemplate.fromTemplate(
  "Translate '{text}' from English to German"
);

const chain = promptTemplate.pipe(model);

const stream = await chain.stream({ text: "I love programming" });

let response = '';
for await (const chunk of stream) {
  response += chunk?.content;
}

// Now you can send the response to Google Chat
sendToGoogleChat(response);

In this example, sendToGoogleChat is a hypothetical function that you would need to implement to send the response to Google Chat. The implementation of this function would depend on the specifics of the Google Chat API.

Please note that the stream method returns chunks of the response, not the entire response at once. In the context shared, the stream method is used to stream a diff as JSON patch operations or the entire aggregated JSON object. In the example above, we concatenate these chunks to form the complete response.

You can find more information about the stream method in the ChatCloudflareWorkersAI class and ChatOpenAI class in the following sources:

• examples/src/models/chat/integration_cloudflare_workersai.ts
• examples/src/prompts/json_structured_output_parser_streaming.ts
• examples/src/guides/expression_language/interface_stream.ts
• langchain/src/chat_models/tests/chatcloudflare_workersai.int.test.ts

I hope this helps! If you have any other questions, feel free to ask.

Sources

• examples/src/models/chat/integration_cloudflare_workersai.ts
• examples/src/prompts/json_structured_output_parser_streaming.ts
• examples/src/guides/expression_language/interface_stream.ts
• langchain/src/chat_models/tests/chatcloudflare_workersai.int.test.ts
• examples/src/models/chat/chat_streaming_stream_method.ts
• langchain/src/chat_models/cloudflare_workersai.ts

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