use anyhow::Result;
use rusty_v8 as v8;
pub fn setup_tools_api(scope: &mut v8::PinScope, _context: &v8::Local<v8::Context>) -> Result<()> {
let tools_js_bootstrap = r#"
(function() {
// --- 1. Schema Validator & Coercer ---
function validateAgainstSchema(schema, data) {
if (!schema || typeof schema !== 'object') {
return { valid: true, value: data };
}
if (data === undefined || data === null) {
if (schema.default !== undefined) {
return { valid: true, value: schema.default };
}
return { valid: true, value: data };
}
const expectedType = schema.type;
const coerced = { ...data };
if (expectedType === 'object') {
if (typeof data !== 'object' || Array.isArray(data)) {
return { valid: false, error: `Expected object, received ${typeof data}` };
}
// Check required properties
if (Array.isArray(schema.required)) {
for (const reqKey of schema.required) {
if (data[reqKey] === undefined) {
if (schema.properties && schema.properties[reqKey] && schema.properties[reqKey].default !== undefined) {
coerced[reqKey] = schema.properties[reqKey].default;
} else {
return { valid: false, error: `Missing required property: '${reqKey}'` };
}
}
}
}
// Check and coerce property types
if (schema.properties && typeof schema.properties === 'object') {
for (const [key, propSchema] of Object.entries(schema.properties)) {
if (coerced[key] !== undefined) {
const res = validateAgainstSchema(propSchema, coerced[key]);
if (!res.valid) {
return { valid: false, error: `Field '${key}': ${res.error}` };
}
coerced[key] = res.value;
} else if (propSchema.default !== undefined) {
coerced[key] = propSchema.default;
}
}
}
return { valid: true, value: coerced };
}
if (expectedType === 'string') {
if (typeof data !== 'string') {
return { valid: false, error: `Expected string, received ${typeof data}` };
}
if (Array.isArray(schema.enum) && !schema.enum.includes(data)) {
return { valid: false, error: `Value '${data}' not in allowed enum: [${schema.enum.join(', ')}]` };
}
return { valid: true, value: data };
}
if (expectedType === 'number' || expectedType === 'integer') {
const num = Number(data);
if (isNaN(num)) {
return { valid: false, error: `Expected number, received '${data}'` };
}
if (expectedType === 'integer' && !Number.isInteger(num)) {
return { valid: false, error: `Expected integer, received '${data}'` };
}
return { valid: true, value: num };
}
if (expectedType === 'boolean') {
if (typeof data === 'boolean') return { valid: true, value: data };
if (data === 'true') return { valid: true, value: true };
if (data === 'false') return { valid: true, value: false };
return { valid: false, error: `Expected boolean, received '${data}'` };
}
if (expectedType === 'array') {
if (!Array.isArray(data)) {
return { valid: false, error: `Expected array, received ${typeof data}` };
}
if (schema.items) {
const items = [];
for (let i = 0; i < data.length; i++) {
const res = validateAgainstSchema(schema.items, data[i]);
if (!res.valid) {
return { valid: false, error: `Array index ${i}: ${res.error}` };
}
items.push(res.value);
}
return { valid: true, value: items };
}
return { valid: true, value: data };
}
return { valid: true, value: data };
}
// --- 2. Tool Compiler ---
class AgentTool {
constructor({ name, description, parameters, execute }) {
if (!name || typeof name !== 'string') {
throw new TypeError('Tool must have a valid string name');
}
if (typeof execute !== 'function') {
throw new TypeError(`Tool '${name}' must have an execute function`);
}
this.name = name;
this.description = description || '';
this.parameters = parameters || { type: 'object', properties: {} };
this._executeFn = execute;
}
async execute(args = {}) {
const check = validateAgainstSchema(this.parameters, args);
if (!check.valid) {
throw new Error(`Tool '${this.name}' argument validation failed: ${check.error}`);
}
return await this._executeFn(check.value);
}
toJSON() {
return {
type: 'function',
function: {
name: this.name,
description: this.description,
parameters: this.parameters
}
};
}
}
function compileSchemaTool(def) {
return new AgentTool(def);
}
// --- 3. OpenAPI 3.x Auto-Synthesis ---
function fromOpenAPI(specOrJson, options = {}) {
let spec = specOrJson;
if (typeof spec === 'string') {
try {
spec = JSON.parse(spec);
} catch (e) {
throw new Error(`Invalid OpenAPI JSON string: ${e.message}`);
}
}
if (!spec || typeof spec !== 'object' || !spec.paths) {
throw new Error('Invalid OpenAPI specification: missing paths object');
}
const baseUrl = options.baseUrl ||
(spec.servers && spec.servers[0] && spec.servers[0].url) ||
'http://localhost';
const defaultHeaders = options.headers || {};
const toolsList = [];
const toolsMap = {};
const httpMethods = ['get', 'post', 'put', 'delete', 'patch', 'options', 'head'];
for (const [pathKey, pathItem] of Object.entries(spec.paths)) {
if (!pathItem || typeof pathItem !== 'object') continue;
for (const method of httpMethods) {
const op = pathItem[method];
if (!op || typeof op !== 'object') continue;
let toolName = op.operationId;
if (!toolName) {
const cleanPath = pathKey.replace(/[^a-zA-Z0-9]/g, '_').replace(/^_+|_+$/g, '');
toolName = `${method}_${cleanPath}`;
}
const description = op.summary || op.description || `${method.toUpperCase()} ${pathKey}`;
// Build unified parameters schema
const properties = {};
const required = [];
// 1. Path & Query parameters
const allParams = [...(pathItem.parameters || []), ...(op.parameters || [])];
for (const p of allParams) {
if (!p || !p.name) continue;
const pSchema = p.schema || { type: 'string' };
properties[p.name] = {
...pSchema,
description: p.description || pSchema.description
};
if (p.required) {
required.push(p.name);
}
}
// 2. Request body schema
let hasRequestBody = false;
if (op.requestBody && op.requestBody.content) {
const jsonContent = op.requestBody.content['application/json'];
if (jsonContent && jsonContent.schema) {
hasRequestBody = true;
if (jsonContent.schema.type === 'object' && jsonContent.schema.properties) {
for (const [k, v] of Object.entries(jsonContent.schema.properties)) {
properties[k] = v;
}
if (Array.isArray(jsonContent.schema.required)) {
required.push(...jsonContent.schema.required);
}
} else {
properties['body'] = jsonContent.schema;
if (op.requestBody.required) required.push('body');
}
}
}
const parameters = {
type: 'object',
properties,
required: Array.from(new Set(required))
};
const execute = async (args = {}) => {
let finalUrl = `${baseUrl.replace(/\/+$/, '')}${pathKey}`;
const queryParams = new URLSearchParams();
let bodyPayload = undefined;
for (const [k, v] of Object.entries(args)) {
const placeholder = `{${k}}`;
if (finalUrl.includes(placeholder)) {
finalUrl = finalUrl.replace(placeholder, encodeURIComponent(String(v)));
} else if (hasRequestBody && properties['body'] && k === 'body') {
bodyPayload = JSON.stringify(v);
} else if (['post', 'put', 'patch'].includes(method) && !allParams.some(p => p.name === k)) {
if (!bodyPayload) bodyPayload = {};
if (typeof bodyPayload === 'object') bodyPayload[k] = v;
} else {
queryParams.append(k, String(v));
}
}
const queryString = queryParams.toString();
if (queryString) {
finalUrl += (finalUrl.includes('?') ? '&' : '?') + queryString;
}
const reqHeaders = {
'Accept': 'application/json',
...defaultHeaders
};
let body = undefined;
if (bodyPayload) {
reqHeaders['Content-Type'] = 'application/json';
body = typeof bodyPayload === 'string' ? bodyPayload : JSON.stringify(bodyPayload);
}
const resp = await fetch(finalUrl, {
method: method.toUpperCase(),
headers: reqHeaders,
body
});
const text = await resp.text();
try {
return JSON.parse(text);
} catch {
return text;
}
};
const tool = new AgentTool({
name: toolName,
description,
parameters,
execute
});
toolsList.push(tool);
toolsMap[toolName] = tool;
}
}
toolsList.map = toolsMap;
return toolsList;
}
// --- 4. LLM Tool Call Parser ---
function parseToolCalls(llmOutput) {
if (!llmOutput) return [];
const text = typeof llmOutput === 'string' ? llmOutput.trim() : JSON.stringify(llmOutput);
// 1. Direct JSON parse
try {
const parsed = JSON.parse(text);
if (Array.isArray(parsed)) {
return parsed.map(normalizeToolCall).filter(Boolean);
}
if (parsed && typeof parsed === 'object') {
if (Array.isArray(parsed.tool_calls)) {
return parsed.tool_calls.map(tc => {
const fn = tc.function || tc;
return {
name: fn.name,
arguments: typeof fn.arguments === 'string' ? JSON.parse(fn.arguments) : (fn.arguments || {})
};
});
}
if ((parsed.name || parsed.tool) && (parsed.arguments || parsed.parameters)) {
return [normalizeToolCall(parsed)];
}
}
} catch {}
// 2. Extract from markdown ```json ... ``` blocks
const codeBlockRegex = /```(?:json)?\s*([\s\S]*?)\s*```/g;
let match;
const extracted = [];
while ((match = codeBlockRegex.exec(text)) !== null) {
try {
const blockJson = JSON.parse(match[1].trim());
if (Array.isArray(blockJson)) {
extracted.push(...blockJson.map(normalizeToolCall).filter(Boolean));
} else if (blockJson && typeof blockJson === 'object') {
const norm = normalizeToolCall(blockJson);
if (norm) extracted.push(norm);
}
} catch {}
}
if (extracted.length > 0) return extracted;
// 3. Fallback: extract single JSON object or array
const jsonObjRegex = /\{[\s\S]*?"(?:name|tool)"\s*:[\s\S]*?\}/g;
while ((match = jsonObjRegex.exec(text)) !== null) {
try {
const parsed = JSON.parse(match[0].trim());
const norm = normalizeToolCall(parsed);
if (norm) extracted.push(norm);
} catch {}
}
return extracted.filter(Boolean);
}
function normalizeToolCall(obj) {
if (!obj || typeof obj !== 'object') return null;
const name = obj.name || obj.tool || (obj.function && obj.function.name);
let args = obj.arguments || obj.parameters || (obj.function && obj.function.arguments) || {};
if (typeof args === 'string') {
try { args = JSON.parse(args); } catch {}
}
if (!name) return null;
return { name: String(name), arguments: typeof args === 'object' && args !== null ? args : {} };
}
// --- 5. Pipeline Registration Helper ---
function registerTools(pipeline, tools) {
if (!pipeline || typeof pipeline.registerTool !== 'function') {
throw new TypeError('registerTools requires an AgentPipeline instance');
}
const list = Array.isArray(tools) ? tools : Object.values(tools || {});
for (const t of list) {
if (t && t.name && typeof t.execute === 'function') {
pipeline.registerTool(t);
}
}
return pipeline;
}
const toolsModule = {
AgentTool,
compileSchemaTool,
fromOpenAPI,
parseToolCalls,
registerTools,
default: {
AgentTool,
compileSchemaTool,
fromOpenAPI,
parseToolCalls,
registerTools
}
};
globalThis.__amber_tools = toolsModule;
globalThis.tools = toolsModule;
})();
"#;
if let Some(code) = v8::String::new(scope, tools_js_bootstrap) {
if let Some(script) = v8::Script::compile(scope, code, None) {
let _ = script.run(scope);
}
}
Ok(())
}