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import Claude from "@anthropic-ai/sdk";
import { RESPONSE_LENGTH } from "./logic/constants";
import type { AIModelAPI, ChatMessage, InputToken } from "./types";
import { BOOKWORM_SYS } from "./prompts";
import type { AsyncRes } from "sortug";
import type {
ImageBlockParam,
MessageCreateParamsStreaming,
TextBlockParam,
} from "@anthropic-ai/sdk/resources";
type Message = Claude.Messages.MessageParam;
export default class ClaudeAPI implements AIModelAPI {
private model: string = "claude-opus-4-20250514";
tokenizer: (text: string) => number;
maxTokens: number;
// model: string = "claude-3-5-sonnet-20241022";
constructor(
model: string,
maxTokens = 200_000,
tokenizer: (text: string) => number = (text) => text.length / 3,
) {
this.maxTokens = maxTokens;
this.tokenizer = tokenizer;
if (model) this.model = model;
}
public setModel(model: string) {
this.model = model;
}
private mapMessages(input: ChatMessage[]): Message[] {
return input.map((m) => {
const role = m.author === "claude" ? "assistant" : "user";
return { role, content: m.text };
});
}
private buildInput(tokens: InputToken[]): Message[] {
// can do base64 for images too
const content = tokens.map((t) => {
const content =
"text" in t
? ({ type: "text", text: t.text } as TextBlockParam)
: "img" in t
? ({
type: "image",
source: { type: "url", url: t.img },
} as ImageBlockParam)
: ({ type: "text", text: "oy vey" } as TextBlockParam);
return content;
});
return [{ role: "user", content }];
}
// https://docs.anthropic.com/en/api/messages-examples#vision
public async send(input: string | InputToken[], sys?: string) {
const msgs: Message[] =
typeof input === "string"
? [{ role: "user", content: input }]
: this.buildInput(input);
const truncated = this.truncateHistory(msgs);
const res = await this.apiCall(truncated, sys);
return res;
}
public async sendDoc(data: string) {
const sys = BOOKWORM_SYS;
const msg: Message = {
role: "user",
content: [
{
type: "document",
source: { type: "base64", data, media_type: "application/pdf" },
},
{
type: "text",
text: "Please analyze this according to your system prompt. Be thorough.",
},
],
};
const res = await this.apiCall([msg], sys);
return res;
}
public async stream(
input: string | InputToken[],
handle: (c: any) => void,
sys?: string,
) {
const msgs: Message[] =
typeof input === "string"
? [{ role: "user", content: input }]
: this.buildInput(input);
const truncated = this.truncateHistory(msgs);
await this.apiCallStream(truncated, handle, sys);
}
private truncateHistory(messages: Message[]): Message[] {
const totalTokens = messages.reduce((total, message) => {
return total + this.tokenizer(message.content as string);
}, 0);
while (totalTokens > this.maxTokens && messages.length > 1) {
messages.splice(0, 1);
}
return messages;
}
// TODO
// https://docs.anthropic.com/en/api/messages-examples#putting-words-in-claudes-mouth
private async apiCall(
messages: Message[],
system?: string,
): Promise<AsyncRes<string>> {
try {
const claud = new Claude();
const params = {
model: this.model,
max_tokens: RESPONSE_LENGTH,
messages,
};
const res = await claud.messages.create(
system ? { ...params, system } : params,
);
const resm: string = res.content.reduce((acc: string, item) => {
if (item.type === "tool_use") return acc;
else if (item.type === "text") return `${acc}\n${item.text}`;
else return acc;
}, "");
// const resm = res.content.reduce((acc: string[], item) => {
// if (item.type === "tool_use") return acc;
// else if (item.type === "text") return [...acc, item.text]
// else return acc;
// }, []);
return { ok: resm };
} catch (e) {
console.log(e, "error in claude api");
return { error: `${e}` };
}
}
private async apiCallStream(
messages: Message[],
handle: (c: any) => void,
system?: string,
): Promise<void> {
try {
const claud = new Claude();
const params = {
model: this.model,
max_tokens: RESPONSE_LENGTH,
messages,
stream: true as true,
};
const fparams: MessageCreateParamsStreaming = system
? { ...params, system }
: params;
const stream = await claud.messages.create(fparams);
for await (const part of stream) {
if (part.type === "message_start") continue;
if (part.type === "content_block_start") continue;
if (part.type === "content_block_delta") {
console.log("delta", part.delta);
const delta: any = part.delta;
handle(delta.text);
}
}
} catch (e) {
console.log(e, "error in claude api");
handle(`Error streaming Claude, ${e}`);
}
}
}
|
