api/app/clients/tools/structured/E2BTools.js

const { StructuredTool } = require('langchain/tools');
const { PromptTemplate } = require('langchain/prompts');
const { createExtractionChainFromZod } = require('./extractionChain');
// const { ChatOpenAI } = require('langchain/chat_models/openai');
const axios = require('axios');
const { z } = require('zod');

const envs = ['Nodejs', 'Go', 'Bash', 'Rust', 'Python3', 'PHP', 'Java', 'Perl', 'DotNET'];
const env = z.enum(envs);

const template = `Extract the correct environment for the following code.

It must be one of these values: ${envs.join(', ')}.

Code:
{input}
`;

const prompt = PromptTemplate.fromTemplate(template);

// const schema = {
//   type: 'object',
//   properties: {
//     env: { type: 'string' },
//   },
//   required: ['env'],
// };

const zodSchema = z.object({
  env: z.string(),
});

async function extractEnvFromCode(code, model) {
  // const chatModel = new ChatOpenAI({ openAIApiKey, modelName: 'gpt-4-0613', temperature: 0 });
  const chain = createExtractionChainFromZod(zodSchema, model, { prompt, verbose: true });
  const result = await chain.run(code);
  console.log('<--------------- extractEnvFromCode --------------->');
  console.log(result);
  return result.env;
}

function getServerURL() {
  const url = process.env.E2B_SERVER_URL || '';
  if (!url) {
    throw new Error('Missing E2B_SERVER_URL environment variable.');
  }
  return url;
}

const headers = {
  'Content-Type': 'application/json',
  'openai-conversation-id': 'some-uuid',
};

class RunCommand extends StructuredTool {
  constructor(fields) {
    super();
    this.name = 'RunCommand';
    this.url = fields.E2B_SERVER_URL || getServerURL();
    this.description =
      'This plugin allows interactive code execution by allowing terminal commands to be ran in the requested environment. To be used in tandem with WriteFile and ReadFile for Code interpretation and execution.';
    this.headers = headers;
    this.headers['openai-conversation-id'] = fields.conversationId;
    this.schema = z.object({
      command: z.string().describe('Terminal command to run, appropriate to the environment'),
      workDir: z.string().describe('Working directory to run the command in'),
      env: env.describe('Environment to run the command in'),
    });
  }

  async _call(data) {
    console.log(`<--------------- Running ${data} --------------->`);
    const response = await axios({
      url: `${this.url}/commands`,
      method: 'post',
      headers: this.headers,
      data,
    });
    return JSON.stringify(response.data);
  }
}

class ReadFile extends StructuredTool {
  constructor(fields) {
    super();
    this.name = 'ReadFile';
    this.url = fields.E2B_SERVER_URL || getServerURL();
    this.description =
      'This plugin allows reading a file from requested environment. To be used in tandem with WriteFile and RunCommand for Code interpretation and execution.';
    this.headers = headers;
    this.headers['openai-conversation-id'] = fields.conversationId;
    this.schema = z.object({
      path: z.string().describe('Path of the file to read'),
      env: env.describe('Environment to read the file from'),
    });
  }

  async _call(data) {
    console.log(`<--------------- Reading ${data} --------------->`);
    const response = await axios.get(`${this.url}/files`, { params: data, headers: this.headers });
    return response.data;
  }
}

class WriteFile extends StructuredTool {
  constructor(fields) {
    super();
    this.name = 'WriteFile';
    this.url = fields.E2B_SERVER_URL || getServerURL();
    this.model = fields.model;
    this.description =
      'This plugin allows interactive code execution by first writing to a file in the requested environment. To be used in tandem with ReadFile and RunCommand for Code interpretation and execution.';
    this.headers = headers;
    this.headers['openai-conversation-id'] = fields.conversationId;
    this.schema = z.object({
      path: z.string().describe('Path to write the file to'),
      content: z.string().describe('Content to write in the file. Usually code.'),
      env: env.describe('Environment to write the file to'),
    });
  }

  async _call(data) {
    let { env, path, content } = data;
    console.log(`<--------------- environment ${env} typeof ${typeof env}--------------->`);
    if (env && !envs.includes(env)) {
      console.log(`<--------------- Invalid environment ${env} --------------->`);
      env = await extractEnvFromCode(content, this.model);
    } else if (!env) {
      console.log('<--------------- Undefined environment --------------->');
      env = await extractEnvFromCode(content, this.model);
    }

    const payload = {
      params: {
        path,
        env,
      },
      data: {
        content,
      },
    };
    console.log('Writing to file', JSON.stringify(payload));

    await axios({
      url: `${this.url}/files`,
      method: 'put',
      headers: this.headers,
      ...payload,
    });
    return `Successfully written to ${path} in ${env}`;
  }
}

module.exports = [RunCommand, ReadFile, WriteFile];