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import {
handler,
Internal,
kind,
type ConfigDiff,
type Handlers,
type IAdapterRegistry,
type IApiSchema,
type IConfigRuntime,
type IErrorFactory,
type ILog,
type IMeta,
type IModuleConfig,
type IObjectSchema,
type IPlatformApi,
type IRegistry,
type IRemote,
type IWatcher,
} from '@feasibleone/blong/types';
import type {Dirent} from 'node:fs';
import merge from 'ut-function.merge';
import layerProxy from './layerProxy.ts';
import {runInFlow} from './semanticContext.ts';
export interface IWatch {
start: (realm: IRegistry, remote: IRemote, configOverride: object) => Promise<void>;
test: (tester: unknown) => Promise<void>;
stop: () => Promise<void>;
load: <T extends {result: unknown}>(
config: {name: string; pkg: IModuleConfig['pkg']; base: string},
isDirectory: boolean | Record<string, () => Promise<unknown>> | undefined,
isFile: boolean | (() => Promise<unknown>) | undefined,
...path: string[]
) => Promise<(api: T) => T>;
/** Attach a ConfigRuntime so config-file changes trigger in-process reloads */
setConfigRuntime?(configRuntime: IConfigRuntime): void;
/** Attach the registry objectSchema so hot-reload paths can pass it to layerProxy */
setObjectSchema?(schema: IObjectSchema): void;
/**
* Structural snapshot of the handler folders/files discovered on disk.
* Data-only so it can be returned straight from an API endpoint.
*/
describe(): IWatchDescription;
}
/** Handler folders/files discovered from disk, keyed by their owning realm. */
export interface IWatchDescription {
folders: Array<{group: string; realm: string; dir: string}>;
files: Array<{file: string; realm: string}>;
layerFiles: Array<{file: string; realm: string}>;
}
interface ITestContext {
test: (name: string, fn: (t: unknown) => void | Promise<void>) => unknown;
}
const isYaml = (filename: string): boolean => /\.ya?ml$/i.test(filename);
const isJSON = (filename: string): boolean => /\.jsonl?$/i.test(filename);
const isCode = (filename: string): boolean => /(?<!\.d)\.m?(t|j)sx?$/i.test(filename);
const isLayerActivation = (filename: string): boolean =>
/^layer\.(server|browser)\.[mc]?[tj]sx?$/i.test(filename);
const isConfig = (filename: string): boolean => /^config\.[mc]?[tj]sx?$/i.test(filename);
const isPlay = (filename: string): boolean => /\.play\.[mc]?[tj]sx?$/i.test(filename);
const isTest = (filename: string): boolean => /\.test\.[mc]?[tj]sx?$/i.test(filename);
const prefixRE: RegExp = /(?:\d+-)?(.*)/;
interface IConfig {
enabled: boolean;
test: string;
ignored: string[];
configs: string[];
logLevel: Parameters<ILog['logger']>[0];
}
// ---------------------------------------------------------------------------
// affectedNamespaces
// ---------------------------------------------------------------------------
/**
* Given a diff and the set of known port names (e.g. `"realm.adapter.db"`),
* return the subset of port names whose config sub-tree changed.
*
* A port named `"realm.adapter.db"` is considered affected if any diff key
* starts with `"realm.adapter.db."` or equals `"realm.adapter.db"`.
*/
export function affectedNamespaces(diff: ConfigDiff, portNames: Iterable<string>): Set<string> {
const affected = new Set<string>();
for (const portName of portNames) {
for (const diffKey of diff.keys()) {
if (diffKey === portName || diffKey.startsWith(portName + '.')) {
affected.add(portName);
break;
}
}
}
return affected;
}
export default class Watch extends Internal implements IWatch {
#config: IConfig = {
enabled: false,
test: '',
ignored: [],
configs: [],
logLevel: 'debug',
};
#handlerFolders: Map<string, {name: string; pkg: IModuleConfig['pkg']; base: string}> =
new Map();
#handlerFiles: Map<string, {name: string; pkg: IModuleConfig['pkg']; base: string}> = new Map();
#layerFiles: Map<string, {name: string; pkg: IModuleConfig['pkg']; base: string}> = new Map();
/**
* Every code file discovered inside a handler folder, mapped to its realm.
* Kept separate from `#handlerFiles` (which drives hot-reload decisions and
* is deliberately populated only for single-file loads) so introspection can
* report the full file set without changing reload behaviour.
*/
#discoveredFiles: Map<string, string> = new Map();
#watchers: IWatcher[] = [];
#port: () => unknown;
#error: IErrorFactory;
#objectSchema: IObjectSchema;
#apiSchema: IApiSchema;
#emit: EventTarget = new EventTarget();
#configRuntime: IConfigRuntime | null = null;
#platform: IPlatformApi;
public constructor(
config: IConfig,
{
error,
log,
port,
apiSchema,
objectSchema,
platform,
}: {
error: IErrorFactory;
log: ILog;
port: () => unknown;
apiSchema: IApiSchema;
objectSchema: IObjectSchema;
platform: IPlatformApi;
},
) {
super({log});
this.merge(this.#config, config);
this.#port = port;
this.#error = error;
this.#apiSchema = apiSchema;
this.#objectSchema = objectSchema;
this.#platform = platform;
}
/** Attach the registry objectSchema so hot-reload paths can pass it to layerProxy */
public setObjectSchema(schema: IObjectSchema): void {
this.#objectSchema = schema;
}
/**
* Structural snapshot of what is loaded from disk.
*
* Group ids follow the same convention the loader registers with
* (`<realm>.<folder>`, see `_loadHandlers`). Paths are made relative to the
* process cwd so the result is stable across machines.
*/
public describe(): IWatchDescription {
const relative = (file: string): string => this.#platform.relative('.', file);
const folderEntries = Array.from(this.#handlerFolders.entries()).map(([dir, config]) => ({
group: `${config.name}.${this.#platform.basename(dir)}`,
realm: config.name,
dir: relative(dir),
}));
const toFiles = (map: Map<string, {name: string}>): Array<{file: string; realm: string}> =>
Array.from(map.entries()).map(([file, config]) => ({
file: relative(file),
realm: config.name,
}));
return {
folders: folderEntries,
files: Array.from(this.#discoveredFiles.entries()).map(([file, realm]) => ({
file: relative(file),
realm,
})),
layerFiles: toFiles(this.#layerFiles),
};
}
/** Attach a ConfigRuntime so config-file changes trigger in-process reloads */
public setConfigRuntime(configRuntime: IConfigRuntime): void {
this.#configRuntime = configRuntime;
}
/**
* Validates handler name matches filename and sets name property for anonymous handlers
* @param item The handler item to validate
* @param filename The file path
* @param expectedName The expected handler name based on filename
* @returns The handler name (either explicit or derived from filename)
*/
private _validateAndSetHandlerName(
item: {name?: string},
filename: string,
expectedName?: string,
): string {
const actualName = item['name'] && item['name'] !== 'default' ? item['name'] : null;
// For files defining a single handler, report error on name mismatch
if (kind(item) === 'handler' && actualName && actualName !== expectedName) {
throw new Error(
`Handler name mismatch in '${filename}': ` +
`function is named '${actualName}' but file is named '${expectedName}.ts'. ` +
`Either rename the function to '${expectedName}' or rename the file to '${actualName}.ts'.`,
);
}
const name = actualName || expectedName;
// Ensure handler name property is set for anonymous handlers
if (kind(item) === 'handler' && !actualName) {
Object.defineProperty(item, 'name', {
value: name,
configurable: true,
enumerable: false,
});
}
return name!;
}
private async _generate(files: {filename: string; name: string}[], dir: string): Promise<void> {
const [schema, names] = files.reduce(
(prev, {filename, name}) => {
const schema = this.#platform
.readFileSync(filename)
.toString()
.match(
/^(\/\*\*((?!\*\/\n).)*\*\/\n)?type Handler = \(((?!(>|}|>});?\n).)*(>|}|>});?\n/ms,
)?.[0];
return schema
? [
[...prev[0], schema.replace('type Handler = (', `type ${name} = (`)],
[...prev[1], name],
]
: prev;
},
[[] as string[], [] as string[]],
);
const codeGen = '@sinclair/typebox-codegen';
const {Formatter, TypeScriptToTypeBox} = await import(/* @vite-ignore */ codeGen);
if (schema.length)
this.#platform.writeFileSync(
this.#platform.join(dir, '~.schema.ts'),
Formatter.Format(`import {validationHandlers} from '@feasibleone/blong';
import { Type, type Static } from 'typebox';
${TypeScriptToTypeBox.Generate(schema.sort().join('\n'), {useTypeBoxImport: false}).trim()}
export default validationHandlers({
${names.sort().join(',\n')}
});
declare module '@feasibleone/blong' {
interface ISchema {
${names
.map(
name =>
`${name}(params: Parameters<${name}>[0], $meta: IMeta): ReturnType<${name}>;`,
)
.join('\n')}
}
}
`),
);
}
private async _loadHandlers(
directory: true | Record<string, () => Promise<unknown>> | undefined,
config: {
name: string;
pkg: IModuleConfig['pkg'];
base: string;
configNames?: string[];
namespace?: Record<string, object>;
[other: string]: unknown;
},
...path: string[]
): Promise<<T>(api: T) => T> {
const dir = this.#platform.join(...path);
const handlers: unknown[] = [];
const validations: unknown[] = [];
const apis: unknown[] = [];
const libs: unknown[] = [];
const assets: unknown[] = [];
const handlerFilenames: {filename: string; name: string}[] = [];
let latest = 0;
const isFile = () => true;
const isDirectory = () => false;
const allFiles =
directory === true
? await this.#platform.scan(dir)
: Object.keys(directory ?? {}).map(path => ({
name: this.#platform.basename(path),
isFile,
isDirectory,
}));
// if (directory !== true) debugger;
const configFile = allFiles.find(entry => entry.isFile() && isConfig(entry.name));
if (configFile) {
const configFilePath = this.#platform.join(dir, configFile.name);
const loaded = (
await import(
/* @vite-ignore */ this.#config.enabled
? configFilePath + '?' + Date.now()
: configFilePath
)
).default;
const folderName = this.#platform.basename(dir);
const mutableConfig = config;
const configNames = mutableConfig.configNames ?? [];
const folderConfig =
loaded &&
typeof loaded === 'object' &&
typeof loaded.default === 'object' &&
loaded.default !== null
? merge(
{},
...['default', ...configNames].map(name => loaded[name]).filter(Boolean),
)
: (loaded ?? {});
const namespaceOverride = mutableConfig?.namespace?.[folderName] ?? {};
mutableConfig[folderName] = merge({}, folderConfig, namespaceOverride);
}
const handlerFiles = allFiles
.sort()
.filter(
entry =>
entry.isFile() &&
isCode(entry.name) &&
!isLayerActivation(entry.name) &&
!isConfig(entry.name) &&
!isPlay(entry.name) &&
!isTest(entry.name),
);
await this.#apiSchema?.generateDir(dir, handlerFiles as Dirent[]);
for (const handlerEntry of handlerFiles) {
const filename = this.#platform.join(dir, handlerEntry.name);
if (
directory === true &&
handlerEntry.name === '~.schema.ts' &&
this.#platform.statSync(filename).mtime.getTime() < latest &&
handlerFilenames.length
)
await this._generate(handlerFilenames, dir);
if (directory === true && (await this.#apiSchema.generateFile(filename))) continue;
const item =
directory === true
? (
await import(
/* @vite-ignore */ this.#config.enabled
? filename + '?' + Date.now()
: filename
)
).default
: ((await directory![filename]()) as {default: unknown}).default;
if (!item) {
this.log?.error?.(
'Error loading ' +
filename +
' ; probably a generic source code was put in a handler group folder',
);
continue;
}
const expectedName = this.#platform.basename(
filename,
this.#platform.extname(filename),
);
this.#discoveredFiles.set(filename, config.name);
const name = expectedName;
(kind(item) === 'validation'
? validations
: kind(item) === 'api'
? apis
: kind(item) === 'lib'
? libs
: handlers
).push(item);
if (kind(item) === 'handler') {
if (directory === true)
latest = Math.max(latest, this.#platform.statSync(filename).mtime.getTime());
handlerFilenames.push({name, filename});
}
}
const assetFiles = allFiles.filter(
entry => entry.isFile() && (isYaml(entry.name) || isJSON(entry.name)),
);
for (const assetFile of assetFiles) {
const filename = this.#platform.join(dir, assetFile.name);
assets.push(
handler(() => ({
assets: {[this.#platform.basename(filename)]: `file://${filename}`},
})),
);
}
this.#handlerFolders.set(dir, config);
return api => {
const apiAny = api as Record<string, (...args: unknown[]) => unknown>;
if (validations.length)
apiAny[this.#platform.basename(dir) + '.validation'](
[...libs, ...validations],
config.name + '.' + this.#platform.basename(dir) + '.validation',
this.#platform.relative('.', dir),
);
if (apis.length)
apiAny[this.#platform.basename(dir) + '.api'](
[...libs, ...apis],
config.name + '.' + this.#platform.basename(dir) + '.api',
this.#platform.relative('.', dir),
);
if (assets.length)
apiAny[this.#platform.basename(dir) + '.asset'](
assets,
config.name + '.' + this.#platform.basename(dir) + '.asset',
this.#platform.relative('.', dir),
);
if (handlers.length)
apiAny[this.#platform.basename(dir)](
[...libs, ...handlers],
config.name + '.' + this.#platform.basename(dir),
this.#platform.relative('.', dir),
);
return api;
};
}
public async load<T extends {result: unknown}>(
config: {name: string; pkg: IModuleConfig['pkg']; base: string},
isDirectory: boolean | Record<string, () => Promise<unknown>> | undefined,
isFile: boolean | object | undefined,
...path: string[]
): Promise<(api: T) => T> {
if (isDirectory) {
return this._loadHandlers(
isDirectory === true
? true
: (isDirectory as Record<string, () => Promise<unknown>>),
config,
...path,
);
} else if (isFile) {
// if (isFile !== true) debugger;
const filename = this.#platform.join(...path);
if (
isCode(filename) &&
!isLayerActivation(this.#platform.basename(filename)) &&
!isPlay(this.#platform.basename(filename)) &&
!isTest(this.#platform.basename(filename))
) {
const item =
typeof isFile === 'function'
? (await isFile()).default
: (
await import(
/* @vite-ignore */
this.#config.enabled ? filename + '?' + Date.now() : filename
)
).default;
// A module without a default export is a plain module shared by
// the group's handlers (e.g. `account.ts`, `accessModel.ts`), not
// a handler — the loader ignores it.
if (!item) return (api: T) => api;
const expectedName = this.#platform
.basename(filename, this.#platform.extname(filename))
.match(prefixRE)?.[1];
const itemName = this._validateAndSetHandlerName(item, filename, expectedName);
if (kind(item) === 'handler') {
this.#handlerFiles.set(filename, config);
return Object.defineProperty(
(api: T) => {
(api as Record<string, (...args: unknown[]) => unknown>)[itemName](
[item],
config.name + '.' + itemName,
this.#platform.relative('.', filename),
);
return api;
},
'name',
{value: itemName},
);
} else {
this.#layerFiles.set(filename, config);
return Object.defineProperty(
(api: T) => {
(api as Record<string, (...args: unknown[]) => unknown>)[itemName](
typeof item === 'function' &&
!['adapter', 'orchestrator'].includes(kind(item))
? item(api)
: item,
config.name + '.' + itemName,
this.#platform.relative('.', filename),
);
return api;
},
'name',
{value: itemName},
);
}
}
}
return (api: T) => api;
}
/**
* In-process config reload pipeline:
* 1. Ask ConfigRuntime to reload and compute the diff
* 2. Emit a structured log event with the diff scope
* 3. For each affected port: call configChanged if present, else stop+start
* 4. Trigger test re-run
*/
private async _reloadConfig(registry: IRegistry, configOverride: object): Promise<void> {
if (!this.#configRuntime) {
// No ConfigRuntime attached — nothing to do (graceful degradation)
this.log?.warn?.({
$meta: {mtid: 'event', method: 'watch.config.reload'},
message: 'ConfigRuntime not attached; config change ignored',
});
return;
}
const prev = this.#configRuntime.rawSnapshot;
const diff: ConfigDiff = await this.#configRuntime.reload();
this.log?.info?.({
$meta: {mtid: 'event', method: 'watch.config.reload'},
changed: Array.from(diff.keys()),
});
if (diff.size === 0) return;
const affected = affectedNamespaces(diff, registry.ports.keys());
const next = this.#configRuntime.snapshot;
let reloaded = 0;
await withProgress(
this.log,
'reload config',
(async () => {
for (const portId of affected) {
const portInstance = await registry.getPort(portId);
if (portInstance) {
if (typeof portInstance['configChanged'] === 'function') {
// Adapter supports the configChanged hook — zero-downtime update
try {
await portInstance['configChanged'](diff, next, prev);
} catch (error) {
this.log?.error?.(error);
}
} else {
// Fallback: stop and restart the port with the current configOverride
await portInstance.stop();
const fresh = await registry.createPort(portId);
if (fresh) {
await fresh.start(configOverride);
await fresh.ready();
}
}
}
reloaded += 1;
}
})(),
{getProgress: () => ({done: reloaded, total: affected.size})},
);
this.#emit.dispatchEvent(new Event('test'));
}
/**
* Common reload unit: re-import a changed file, re-wrap via layerProxy,
* replace in registry, and signal tests.
*
* This unifies the three reload paths (layer file, single handler file,
* handler folder) into a single abstraction.
*/
private async _reloadUnit(
registry: IRegistry,
configOverride: object,
filename: string,
): Promise<void> {
type LayerResult = {
result: Record<string, {methods: unknown[]; source?: string; port?: unknown}>;
};
type ModuleConfig = Parameters<typeof layerProxy>[4];
// Path 1: Layer file changed — recreate and restart the port
const layerConfig = this.#layerFiles.get(filename);
if (layerConfig) {
const id = this.#platform.basename(filename, this.#platform.extname(filename));
const proxy = layerProxy(
this.#error,
this.#objectSchema,
this.#apiSchema,
this.#port,
layerConfig as unknown as ModuleConfig,
);
const loadFn = (await this.load(layerConfig, false, true, filename)) as (
api: LayerResult,
) => LayerResult;
const item = loadFn(proxy as unknown as LayerResult).result[id];
registry.ports.set(layerConfig.name + '.' + id, item.port as IAdapterRegistry);
const port = await registry.createPort(layerConfig.name + '.' + id);
if (!port) return;
await port.start(configOverride);
await port.ready();
await registry.connected();
this.#emit.dispatchEvent(new Event('test'));
return;
}
// Path 2: Config file changed
if (this.#config.configs.includes(filename)) {
await this._reloadConfig(registry, configOverride);
return;
}
// Path 3a: Single handler file changed
let config = this.#handlerFiles.get(filename);
if (config) {
const importProxyCallback = await this.load(config, false, true, filename);
const name = importProxyCallback.name;
const cbResult = (importProxyCallback as unknown as (api: LayerResult) => LayerResult)(
layerProxy(
this.#error,
this.#objectSchema,
this.#apiSchema,
this.#port,
config as unknown as ModuleConfig,
) as unknown as LayerResult,
);
await registry.replaceHandlers(
config.name + '.' + name,
cbResult.result[name].methods as Handlers,
);
} else {
// Path 3b: Handler folder changed — reload entire folder
const dir = this.#platform.dirname(filename);
config = this.#handlerFolders.get(dir);
if (config) {
const handlers = (await this._loadHandlers(true, config, dir))(
layerProxy(
this.#error,
this.#objectSchema,
this.#apiSchema,
this.#port,
config as unknown as ModuleConfig,
) as unknown as LayerResult,
) as unknown as LayerResult;
await registry.replaceHandlers(
config.name + '.' + this.#platform.basename(dir),
handlers.result[this.#platform.basename(dir)].methods as Handlers,
);
if (handlers.result[this.#platform.basename(dir) + '.validation'])
await registry.replaceHandlers(
config.name + '.' + this.#platform.basename(dir) + '.validation',
handlers.result[this.#platform.basename(dir) + '.validation']
.methods as Handlers,
);
}
}
await registry.connected();
this.#emit.dispatchEvent(new Event('test'));
}
private _watch(registry: IRegistry, configOverride: object): void {
const fsWatcher = this.#platform.watch?.(
Array.from(this.#handlerFolders.keys())
.map(folder => [
`${folder}/*.ts`,
`${folder}/*.yaml`,
`${folder}/*.sql`,
`${folder}/*.html`,
])
.flat()
.concat(Array.from(this.#handlerFiles.keys()))
.concat(Array.from(this.#layerFiles.keys()))
.concat(this.#config.configs),
{
cwd: '.',
ignoreInitial: true,
ignored: ['.git/**', 'node_modules/**', 'dist/**', ...(this.#config.ignored || [])],
},
);
if (!fsWatcher) return;
this.#watchers.push(fsWatcher);
fsWatcher.on('error', error => this.log?.error?.(error));
fsWatcher.on('all', async (event, filename) => {
try {
filename = this.#platform.resolve(filename);
this.log?.info?.(
{
$meta: {mtid: 'event', method: `watch.reload.${event}`},
},
filename,
);
await this._reloadUnit(registry, configOverride, filename);
} catch (error) {
this.log?.error?.(error);
}
});
}
public async start(
registry: IRegistry,
remote: IRemote,
configOverride: object,
): Promise<void> {
if (this.#config.enabled)
this.log?.debug?.({
$meta: {mtid: 'event', method: 'watch.start'},
dir: Array.from(this.#handlerFolders.keys())
.concat(Array.from(this.#handlerFiles.keys()))
.concat(Array.from(this.#layerFiles.keys()))
.map(folder => this.#platform.relative('.', folder)),
});
if (this.#config.test) {
this.#emit.addEventListener('test', async (event: Event) => {
const {done, test} = ((event as CustomEvent).detail ?? {}) as {
done?: (error?: unknown) => void;
test?: unknown;
};
try {
const chain = await (
await import('./chain.ts')
).default(test as ITestContext, this.log);
const steps = await Promise.all(
([] as string[]).concat(this.#config.test).map(async method => {
// Nothing above a test group minted a flow, so each group is
// an entry of its own. The groups run in parallel, so one
// flow for the whole run would interleave unrelated
// scenarios into a single diagram; a flow per group gives
// one scenario per flow, which is what there is to draw.
const meta: IMeta = {mtid: 'event', method};
const result = await runInFlow(meta, method, () =>
remote.remote(method)({}, meta),
);
if (Array.isArray(result) && !('name' in result)) {
Object.defineProperty(result, 'name', {
value: method.replace(/^test\./, '').replace(/\./g, ' '),
configurable: true,
});
}
return result;
}),
);
let executed = 0;
await withProgress(
this.log,
'run test groups',
(async () => {
await Promise.all(
steps.map(async step => {
await chain(step as Parameters<typeof chain>[0]);
executed += 1;
}),
);
})(),
{getProgress: () => ({done: executed, total: steps.length})},
);
} catch (error) {
this.log?.error?.(error);
done?.(error);
return;
}
done?.();
});
}
if (this.#config.enabled) this._watch(registry, configOverride);
await registry.connected();
}
public async test(framework: unknown): Promise<void> {
// `test()` settles only when the `start()`-registered listener calls `done`, and
// that listener is registered only when test groups are declared. Waiting for it
// unconditionally hangs the whole run with no output at all — a silent wait, which
// is exactly what a suite that loads a platform without test groups (a browser
// platform in a tap run, say) used to get. Report it and return: nothing to run is
// not an error, it just has to be said out loud.
const groups = ([] as string[]).concat(this.#config.test ?? []);
if (groups.length === 0) {
this.log?.info?.(
{$meta: {mtid: 'event', method: 'watch.test.none'}},
'no test groups configured on this platform; nothing to run',
);
return;
}
return new Promise<void>((resolve, reject) => {
// this.#emit.emit('test', error => (error ? reject(error) : resolve()), framework);
this.#emit.dispatchEvent(
new CustomEvent('test', {
detail: {
done: (error?: unknown) => (error ? reject(error) : resolve()),
test: framework,
},
}),
);
});
}
public async stop(): Promise<void> {
while (this.#watchers.length) {
const watcher = this.#watchers.pop();
await watcher?.close();
}
}
}
|