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kind,
type Adapter,
type IAdapterFactory,
type IApiSchema,
type IConfigRuntime,
type IErrorFactory,
type ILib,
type IMeta,
type IModuleConfig,
} from '@feasibleone/blong/types';
import merge from 'ut-function.merge';
import createPort from './AdapterBase.ts';
import ConfigRuntime from './ConfigRuntime.ts';
import createHandlerProxy from './handlerProxy.ts';
import {methodId} from './lib.ts';
import type {IPort} from './Port.ts';
/**
* Create the handler closure that is pushed into `where.methods[]`.
*
* This closure is invoked later by `Registry._createHandlers()` to assemble the
* layerApi object, load libraries, and process handler/validation/api/model items.
*/
function createHandlerClosure(
others: any[], // eslint-disable-line @typescript-eslint/no-explicit-any
moduleConfigSlice: unknown,
name: string,
namespace: string,
source: string,
target: {result: {error: unknown}},
apiSchema: IApiSchema | undefined,
configRuntime: IConfigRuntime | undefined,
): (params: {
remote: (methodName: string) => () => unknown;
lib: ILib;
local: object;
literals: unknown[];
port: Adapter;
attachCheckpoint?: (meta: IMeta) => void;
}) => Promise<void> {
return async function ({
remote,
lib,
local,
literals,
port,
attachCheckpoint,
...rest
}: {
remote: (methodName: string) => () => unknown;
lib: ILib;
local: object;
literals: unknown[];
port: Adapter;
attachCheckpoint?: (meta: IMeta) => void;
}) {
const mergedConfig = ConfigRuntime.mergeLayerConfig(
moduleConfigSlice,
port?.config?.[namespace],
);
const layerApi = {
...rest,
config: mergedConfig,
lib: new Proxy(lib, {
get(target: ILib, functionName: string) {
const rec = target as unknown as Record<string, unknown>;
let fn: () => unknown;
return (
rec[functionName] ??
function (...params: unknown[]) {
fn ||= rec[functionName] as () => unknown;
if (!fn)
throw new Error(
`Lib property '${functionName.toString()}' not found. Available properties are: ${Object.keys(
rec,
).sort()}`,
);
return fn.apply(port, params as []);
}
);
},
}),
handler: createHandlerProxy(local, port, remote, attachCheckpoint, lib, mergedConfig),
errors: target.result.error,
};
for (let what of others) {
switch (`${typeof what}:${kind(what)}`) {
case 'object:lib':
merge(lib, what);
break;
case 'function:lib':
what = await what(layerApi);
if (typeof what === 'function') (lib as unknown as Record<string, unknown>)[what.name] = what;
else merge(lib, what);
}
}
for (let what of others) {
const kindOfWhat = kind(what);
switch (`${typeof what}:${kindOfWhat}`) {
case 'object:handler':
case 'object:validation':
merge(local, what);
break;
case 'function:api':
merge(local, await apiSchema!.schema(what(layerApi), source));
break;
case 'function:handler':
case 'function:validation':
case 'function:model':
case 'function:fixture':
configRuntime?.enterConfig();
try {
what = await what(layerApi);
} finally {
configRuntime?.exitConfig();
}
const created = await (port as unknown as {createHandlers?: (opts: unknown) => Promise<unknown>})?.createHandlers?.({
handlers: typeof what === 'function' ? [what] : what,
layerApi,
kind: kindOfWhat,
});
if (typeof what === 'function') {
(local as Record<string, unknown>)[methodId(what.name)] = what;
} else {
literals.push(what);
what = methodId(what);
merge(local, what);
}
Object.assign(local, methodId(created));
}
}
};
}
export default function layerProxy(
errors: IErrorFactory | undefined,
apiSchema: IApiSchema | undefined,
port: (() => void) | undefined,
moduleConfig: {
pkg: IModuleConfig['pkg'];
base: string;
configNames?: string[];
} & {
[name: string]: object;
},
configRuntime?: IConfigRuntime,
): {result: {error: unknown}; feature: unknown} {
return new Proxy(
{
error: errors?.register.bind(errors),
result: {error: errors?.get()},
feature() {},
},
{
get(
target: {error: unknown; result: {error: unknown}; feature: unknown},
name: string,
receiver: unknown,
) {
switch (name) {
case 'utPort':
return port;
case 'registerErrors':
return target.error;
case 'result':
return target.result;
default:
return (fn: unknown, namespace: string, source: string) => {
type Where = {methods: unknown[]; port?: unknown; source?: string; config?: unknown};
const resultRecord = target.result as Record<string, Where>;
const where: Where = (resultRecord[name] ??= {methods: [], source});
const targetRec = target as unknown as Record<string, ((fn: unknown) => void) | undefined>;
if (targetRec[name]) merge(where, targetRec[name]!(fn));
else {
const fnArr: unknown[] = Array.isArray(fn) ? fn : fn != null ? [fn] : [];
const [ports, others] = fnArr.reduce(
(prev: [unknown[], unknown[]], item: unknown) => {
if (
(port && (item as {prototype?: unknown}).prototype instanceof port) ||
['adapter', 'orchestrator'].includes(kind(item as unknown as Parameters<typeof kind>[0]))
)
prev[0].push(item);
else prev[1].push(item);
return prev;
},
[[], []] as [unknown[], unknown[]],
) as [unknown[], unknown[]];
ports.forEach(what => {
if (what && port && (what as {prototype?: unknown}).prototype instanceof port) {
where.port = async (
{
id,
...portApi
}: Parameters<IAdapterFactory>[0] & {id: string},
configOverride: object,
) => {
const config = {
...moduleConfig?.[name],
id,
pkg: moduleConfig.pkg,
};
const port = new (what as unknown as IPort)({
...portApi,
config: configOverride
? merge({}, config, configOverride)
: config,
configBase: moduleConfig.base,
});
await (port as unknown as {init: () => Promise<void>}).init();
return port;
};
(where.port as unknown as {config: unknown}).config = moduleConfig?.[name];
} else if (what && ['adapter', 'orchestrator'].includes(kind(what as unknown as Parameters<typeof kind>[0]))) {
where.port = async (
api: Parameters<IAdapterFactory>[0] & {id: string},
configOverride: object,
) => {
const {id} = api;
if (!id) return (what as IAdapterFactory)(api as Parameters<IAdapterFactory>[0]);
// Assign `handlers` directly onto the api object rather
// than creating a spread copy. AdapterBase stores
// `_api = api`, and Registry.ts sets
// `api.attachHandlers = fn` *after* this factory
// returns. Keeping the same object reference ensures
// that assignment is visible to `_api.attachHandlers`
// when `start()` is called later.
(api as unknown as Record<string, unknown>).handlers = what;
const port = await createPort(
api as unknown as Parameters<typeof createPort>[0],
moduleConfig.base,
moduleConfig.configNames,
);
const config = {
...moduleConfig?.[name],
id,
pkg: moduleConfig.pkg,
};
await port.init(
configOverride
? merge({}, config, configOverride)
: config,
);
return port;
};
(where.port as unknown as {config: unknown}).config = moduleConfig?.[name];
}
});
if (others.length)
where.methods.push(
createHandlerClosure(
others as unknown[],
moduleConfig[name],
name,
namespace,
source,
target,
apiSchema,
configRuntime,
),
);
}
return receiver;
};
}
},
},
);
}
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