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import OpenAI from "openai";
import { MAX_TOKENS, RESPONSE_LENGTH } from "./logic/constants";
import type { AIModelAPI, ChatMessage, InputToken } from "./types";
import type { AsyncRes } from "sortug";
import type { ChatCompletionContentPart } from "openai/resources";
type OChoice = OpenAI.Chat.Completions.ChatCompletion.Choice;
type Message = OpenAI.Chat.Completions.ChatCompletionUserMessageParam;
type OMessage = OpenAI.Chat.Completions.ChatCompletionMessageParam;
type Props = {
baseURL: string;
apiKey: string;
model?: string;
maxTokens?: number;
tokenizer?: (text: string) => number;
};
export default class OpenAIAPI implements AIModelAPI {
private apiKey;
private baseURL;
private api;
maxTokens: number = MAX_TOKENS;
tokenizer: (text: string) => number = (text) => text.length / 3;
model;
constructor(props: Props) {
this.apiKey = props.apiKey;
this.baseURL = props.baseURL;
this.api = new OpenAI({ baseURL: this.baseURL, apiKey: this.apiKey });
this.model = props.model || "";
if (props.maxTokens) this.maxTokens = props.maxTokens;
if (props.tokenizer) this.tokenizer = props.tokenizer;
}
public setModel(model: string) {
this.model = model;
}
private mapMessages(input: ChatMessage[]): Message[] {
return input.map((m) => {
return { role: m.author as any, content: m.text, name: m.author };
});
}
private buildInput(tokens: InputToken[]): Message[] {
const content: ChatCompletionContentPart[] = tokens.map((t) => {
if ("text" in t) return { type: "text", text: t.text };
if ("img" in t) return { type: "image_url", image_url: { url: t.img } };
else return { type: "text", text: "oy vey" };
});
return [{ role: "user", content }];
}
public async send(
input: string | InputToken[],
sys?: string,
): AsyncRes<string> {
const messages: Message[] =
typeof input === "string"
? [{ role: "user" as const, content: input }]
: this.buildInput(input);
// const messages = this.mapMessages(input);
const allMessages: OMessage[] = sys
? [{ role: "system", content: sys }, ...messages]
: messages;
const truncated = this.truncateHistory(allMessages);
const res = await this.apiCall(truncated);
if ("error" in res) return res;
else {
try {
// TODO type this properly
const choices: OChoice[] = res.ok;
const resText = choices.reduce((acc, item) => {
return `${acc}\n${item.message.content || ""}`;
}, "");
return { ok: resText };
} catch (e) {
return { error: `${e}` };
}
}
}
public async stream(
input: string | InputToken[],
handle: (c: string) => void,
sys?: string,
) {
const messages: Message[] =
typeof input === "string"
? [{ role: "user" as const, content: input }]
: this.buildInput(input);
// const messages = this.mapMessages(input);
const allMessages: OMessage[] = sys
? [{ role: "system", content: sys }, ...messages]
: messages;
const truncated = this.truncateHistory(allMessages);
await this.apiCallStream(truncated, handle);
}
private truncateHistory(messages: OMessage[]): OMessage[] {
const totalTokens = messages.reduce((total, message) => {
return total + this.tokenizer(message.content as string);
}, 0);
while (totalTokens > this.maxTokens && messages.length > 1) {
// Always keep the system message if it exists
const startIndex = messages[0].role === "system" ? 1 : 0;
messages.splice(startIndex, 1);
}
return messages;
}
// TODO custom temperature?
private async apiCall(messages: OMessage[]): AsyncRes<OChoice[]> {
// console.log({ messages }, "at the very end");
try {
const completion = await this.api.chat.completions.create({
// temperature: 1.3,
model: this.model,
messages,
max_tokens: RESPONSE_LENGTH,
});
if (!completion) return { error: "null response from openai" };
return { ok: completion.choices };
} catch (e) {
console.log(e, "error in openai api");
return { error: `${e}` };
}
}
private async apiCallStream(
messages: OMessage[],
handle: (c: string) => void,
): Promise<void> {
try {
const stream = await this.api.chat.completions.create({
temperature: 1.3,
model: this.model,
messages,
max_tokens: RESPONSE_LENGTH,
stream: true,
});
for await (const chunk of stream) {
for (const choice of chunk.choices) {
console.log({ choice });
if (!choice.delta) continue;
const cont = choice.delta.content;
if (!cont) continue;
handle(cont);
}
}
} catch (e) {
console.log(e, "error in openai api");
handle(`Error streaming OpenAI, ${e}`);
}
}
}
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