solana-multiagent/test/checkpointer to vercel ai messages.js

import { PostgresSaver } from "@langchain/langgraph-checkpoint-postgres";
import { isAIMessage, isHumanMessage,isToolMessage } from "@langchain/core/messages";
import graph from "./graph.js";
import { ulid } from "ulid";
const checkpointer = PostgresSaver.fromConnString('postgres://postgres:eMd9hliASrN1yuNOYSk7LtOdlLRnnlnhUF31JKww6zQ=@supabase-pgdb-1:5432/solana');


const interrupterMessageCreator = (id, toolCalls) => {
    const template = {
      id: id,
      createdAt: new Date().toISOString(),
      role: "assistant",
      content: "",
      parts: [
        {
          type: "tool-invocation",
          toolInvocation: {
            state: "result",
            step: 0,
            toolCallId: "interrupter",
            toolName: "interrupter",
            args: {
              toolCalls: toolCalls,
            },
            result: "Your input is required to proceed",
          },
        },
      ],
      toolInvocations: [
        {
          state: "result",
          step: 0,
          toolCallId: "01JM87QQ72ZDYY01389N4JTV6P",
          toolName: "interrupter",
          args: {
            toolCalls: toolCalls,
          },
          result: "Your input is required to proceed",
        },
      ],
      revisionId: ulid(),
    };
    return template;
};
  
const humanMessageCreator = (message) => {
    const template = {
      id: message.id,
      createdAt: new Date().toISOString(),
      role: "user",
      content: message.content,
      parts: [
        {
          type: "text",
          text: message.content,
        },
      ],
    };
    return template;
};
  
const aiMessageCreator = (id, content, tools) => {
    const template = {
      id: id,
      createdAt: new Date().toISOString(),
      role: "assistant",
      content: content,
      parts: [],
      revisionId: ulid(),
    };
    if (tools.length != 0) {
      template.toolInvocations = tools;
    }
  
    tools.forEach((tool) => {
      template.parts.push({
        type: "tool-invocation",
        toolInvocation: tool,
      });
    });
  
    template.parts.push({
      type: "text",
      text: content,
    });
  
    return template;
};
  
const toolMessageCreator = (message, step) => {
    const template = {
      state: "result",
      step: step,
      toolCallId: message.tool_call_id,
      toolName: message.name,
      args: message.artifact ? { artifact: message.artifact } : {},
      result: message.content,
    };
  
    return template;
};
  
const thread_id = `did:privy:cm6uxey3z00852ix3h40ixj7c-acvcvcvfsssssd`;
  
async function checkpointToVercelAI(thread_id) {
    const config = { configurable: { thread_id } };
    const checkpointerData = await checkpointer.get(config);
    const vercel_messages = [
      {
        id: "1",
        content: "Hi! How can i assist you today?",
        role: "assistant",
      },
    ];
  
    if (!checkpointerData) {
      return vercel_messages;
    }
    let tools_grouped = [];
  
    for (const message of checkpointerData.channel_values.messages) {
      if (isHumanMessage(message)) {
        vercel_messages.push(humanMessageCreator(message));
      } else if (isToolMessage(message)) {
        tools_grouped.push(toolMessageCreator(message, tools_grouped.length));
      } else if (isAIMessage(message) && message.content != "") {
        vercel_messages.push(aiMessageCreator(message.id, message.content, tools_grouped));
        tools_grouped = [];
      }
    }
  
    if (typeof checkpointerData?.channel_values === "object" && "branch:agent:condition:checkApproval" in checkpointerData.channel_values) {
      let interrupterTool;
      for await (const event of await graph.stream(null, config)) {
        interrupterTool = event.__interrupt__;
      }
      const toolCalls = interrupterTool[0].value.map((tool) => ({
        id: tool.id,
        name: tool.name,
        args: Object.fromEntries(Object.entries(tool.args).filter(([key]) => key !== "debug")),
      }));
  
      const id = interrupterTool[0].ns[0];
      const interruptMessage = interrupterMessageCreator(id, toolCalls);
      vercel_messages.push(interruptMessage);
    }
    
    return vercel_messages;
}
  
checkpointToVercelAI(thread_id);