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import type { AppContext } from '@api/types/hono';
import {
type ChatCompletionRequestData,
FunctionName,
type ResponsesRequestData,
type StreamChatCompletionRequestData,
} from '@shared/types/api/request';
import type {
CodeInterpreter,
ComputerTool,
CustomTool,
FileSearchTool,
FunctionTool,
ImageGeneration,
LocalShell,
Mcp,
WebSearchTool,
} from '@shared/types/api/routes/responses-api/request';
import type { ChatCompletionTool } from '@shared/types/api/routes/shared/tools';
import type { ToolCreateParams } from '@shared/types/data/tool';
import type { Next } from 'hono';
import { getRuntimeKey } from 'hono/adapter';
import { createMiddleware } from 'hono/factory';
import stableStringify from 'json-stable-stringify';
type ResponsesTool =
| FunctionTool
| FileSearchTool
| WebSearchTool
| ComputerTool
| Mcp
| CodeInterpreter
| ImageGeneration
| LocalShell
| CustomTool;
async function produceToolCache(
completionTool: ChatCompletionTool | ResponsesTool,
): Promise<string> {
const stringToHash = stableStringify(completionTool);
const encodedHash = new TextEncoder().encode(stringToHash);
const cacheDigest = await crypto.subtle.digest(
{
name: 'SHA-256',
},
encodedHash,
);
return Array.from(new Uint8Array(cacheDigest))
.map((b) => b.toString(16).padStart(2, '0'))
.join('');
}
function getToolsFromChatCompletionRequest(
saRequestData: ChatCompletionRequestData | StreamChatCompletionRequestData,
): ChatCompletionTool[] {
const tools = saRequestData.requestBody.tools || [];
if (!tools) {
return [];
}
return tools;
}
function getToolsFromCreateModelResponseRequest(
saRequestData: ResponsesRequestData,
): ResponsesTool[] {
const tools = saRequestData.requestBody.tools || [];
if (!tools) {
return [];
}
return tools;
}
async function captureTool(
c: AppContext,
agent_id: string,
saRequestData:
| ChatCompletionRequestData
| StreamChatCompletionRequestData
| ResponsesRequestData,
userDataStorageConnector: UserDataStorageConnector,
): Promise<void> {
let completionTools: (ChatCompletionTool | ResponsesTool)[] = [];
if (
saRequestData.functionName === FunctionName.CHAT_COMPLETE ||
saRequestData.functionName === FunctionName.STREAM_CHAT_COMPLETE
) {
completionTools = getToolsFromChatCompletionRequest(saRequestData);
} else if (
saRequestData.functionName === FunctionName.CREATE_MODEL_RESPONSE
) {
completionTools = getToolsFromCreateModelResponseRequest(saRequestData);
}
await Promise.all(
completionTools.map(async (completionTool) => {
const hash = await produceToolCache(completionTool);
// Extract name based on tool type
let toolName = '';
if (completionTool.type === 'function') {
if ('name' in completionTool) {
// New ResponsesTool FunctionTool format
toolName = completionTool.name as string;
} else if (
'function' in completionTool &&
completionTool.function?.name
) {
// Legacy ChatCompletionTool format
toolName = (completionTool as ChatCompletionTool).function.name;
}
} else if (
completionTool.type === 'mcp' &&
'server_label' in completionTool
) {
// MCP tools use server_label
toolName = (completionTool as Mcp).server_label;
} else if (completionTool.type === 'custom' && 'name' in completionTool) {
// Custom tools have name
toolName = (completionTool as CustomTool).name;
} else {
// For other tool types, use the type as name
toolName = completionTool.type;
}
const tool: ToolCreateParams = {
agent_id,
hash,
type: completionTool.type,
name: toolName,
raw_data: completionTool,
};
try {
await userDataStorageConnector.createTool(c, tool);
} catch {
// If the tool already exists, we don't need to do anything
}
}),
);
}
export const toolMiddleware = createMiddleware(
async (c: AppContext, next: Next) => {
await next();
const saRequestData = c.get('sa_request_data');
// If saRequestData is not set, it means that this is not an endpoint that we want to capture
if (!saRequestData) {
return;
}
// These are the endpoints that can contain tools
if (
saRequestData.functionName !== FunctionName.CHAT_COMPLETE &&
saRequestData.functionName !== FunctionName.STREAM_CHAT_COMPLETE &&
saRequestData.functionName !== FunctionName.CREATE_MODEL_RESPONSE
) {
return;
}
if (getRuntimeKey() === 'workerd') {
c.executionCtx.waitUntil(
captureTool(
c,
c.get('agent').id,
saRequestData,
c.get('user_data_storage_connector'),
),
);
} else {
await captureTool(
c,
c.get('agent').id,
saRequestData,
c.get('user_data_storage_connector'),
);
}
},
);
|