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|
import path from "path";
import { z } from "zod";
import { App } from "../app/";
import { Identifier } from "../id/id";
import { LLM } from "../llm/llm";
import { Storage } from "../storage/storage";
import { Log } from "../util/log";
import {
convertToModelMessages,
streamText,
tool,
type TextUIPart,
type ToolInvocationUIPart,
type UIMessage,
} from "ai";
export namespace Session {
const log = Log.create({ service: "session" });
export interface Info {
id: string;
title: string;
}
const state = App.state("session", () => {
const sessions = new Map<string, Info>();
const messages = new Map<string, UIMessage[]>();
return {
sessions,
messages,
};
});
export async function create() {
const result: Info = {
id: Identifier.create("session"),
title: "New Session - " + new Date().toISOString(),
};
log.info("created", result);
await Storage.write(
"session/info/" + result.id + ".json",
JSON.stringify(result),
);
state().sessions.set(result.id, result);
return result;
}
export async function get(id: string) {
const result = state().sessions.get(id);
if (result) {
return result;
}
const read = JSON.parse(await Storage.readToString("session/info/" + id));
state().sessions.set(id, read);
return read;
}
export async function messages(sessionID: string) {
const result = state().messages.get(sessionID);
if (result) {
return result;
}
const read = JSON.parse(
await Storage.readToString(
"session/message/" + sessionID + ".json",
).catch(() => "[]"),
);
state().messages.set(sessionID, read);
return read;
}
export async function* list() {
try {
const result = await Storage.list("session/info");
for await (const item of result) {
yield path.basename(item.path, ".json");
}
} catch {
return;
}
}
export async function chat(sessionID: string, msg: UIMessage) {
const l = log.clone().tag("session", sessionID);
l.info("chatting");
const msgs = (await messages(sessionID)) ?? [
{
id: Identifier.create("message"),
role: "system",
parts: [
{
type: "text",
text: "You are a helpful assistant called opencode",
},
],
} as UIMessage,
];
msgs.push(msg);
state().messages.set(sessionID, msgs);
async function write() {
return Storage.write(
"session/message/" + sessionID + ".json",
JSON.stringify(msgs),
);
}
await write();
const model = await LLM.findModel("claude-3-7-sonnet-20250219");
const result = streamText({
messages: convertToModelMessages(msgs),
temperature: 0,
tools: {
test: tool({
id: "opencode.test" as const,
parameters: z.object({
feeling: z.string(),
}),
execute: async () => {
return `Hello`;
},
description: "call this tool to get a greeting",
}),
},
model,
});
const next: UIMessage = {
id: Identifier.create("message"),
role: "assistant",
parts: [],
};
msgs.push(next);
let text: TextUIPart | undefined;
const reader = result.toUIMessageStream().getReader();
while (true) {
const { done, value } = await reader.read();
if (done) break;
l.info("part", value);
switch (value.type) {
case "start":
break;
case "start-step":
next.parts.push({
type: "step-start",
});
break;
case "text":
if (!text) {
text = value;
next.parts.push(value);
break;
}
text.text += value.text;
break;
case "tool-call":
next.parts.push({
type: "tool-invocation",
toolInvocation: {
state: "call",
...value,
},
});
break;
case "tool-result":
const match = next.parts.find(
(p) =>
p.type === "tool-invocation" &&
p.toolInvocation.toolCallId === value.toolCallId,
) as ToolInvocationUIPart | undefined;
if (match) {
match.toolInvocation = {
...match.toolInvocation,
state: "result",
result: value.result,
};
await write();
}
break;
case "finish":
await write();
break;
case "finish-step":
await write();
break;
default:
l.info("unhandled", {
type: value.type,
});
}
}
}
}
|
