typing of metadata

src/koishi-metadata-fetcher/koishi-metadata-fetcher.service.ts

+import { Injectable } from '@nestjs/common';
+import { Reflector } from '@nestjs/core';
+import {
+  MetadataArrayMap,
+  MetadataGenericMap,
+} from '../utility/koishi.constants';
+
+@Injectable()
+export class KoishiMetadataFetcherService {
+  constructor(private readonly reflector: Reflector) {}
+
+  getPropertyMetadataArray<K extends keyof MetadataArrayMap, I = any>(
+    metadataKey: K,
+    instance: I,
+    instanceKey: keyof I,
+  ) {
+    return [
+      ...this.getMetadataArray<K>(metadataKey, instance.constructor),
+      ...this.getMetadataArray<K>(metadataKey, instance[instanceKey]),
+    ];
+  }
+
+  getMetadataArray<K extends keyof MetadataArrayMap>(
+    metadataKey: K,
+    instance: any,
+  ) {
+    return (
+      this.reflector.get<MetadataArrayMap[K][]>(metadataKey, instance) || []
+    );
+  }
+
+  getMetadata<K extends keyof MetadataGenericMap>(
+    metadataKey: K,
+    instance: any,
+  ) {
+    return this.reflector.get<MetadataGenericMap[K]>(metadataKey, instance);
+  }
+}

src/koishi.decorators.ts

@@ -8,6 +8,7 @@ import {
   KoishiServiceProvideSym,
   KoishiServiceWireKeys,
   KoishiServiceWireProperty,
+  MetadataArrayMap,
 } from './utility/koishi.constants';
 import {
   CommandDefinitionFun,
@@ -44,9 +45,9 @@ export const InjectContextPlatform = (...values: string[]) =>
 export const InjectContextUser = (...values: string[]) =>
   InjectContextSpecific('user', values);
 
-export const SetExtraMetadata = <K = string, V = any>(
+export const SetExtraMetadata = <K extends keyof MetadataArrayMap>(
   metadataKey: K,
-  metadataValue: V,
+  metadataValue: MetadataArrayMap[K],
 ): CustomDecorator<K> => {
   const decoratorFactory = (target: any, key?: any, descriptor?: any) => {
     const currentMetadata: any[] =
@@ -124,7 +125,7 @@ export function UseCommand(
 export const OnContext = (
   ctxFun: OnContextFunction,
 ): MethodDecorator & ClassDecorator =>
-  SetExtraMetadata<string, OnContextFunction>(KoishiOnContextScope, ctxFun);
+  SetExtraMetadata(KoishiOnContextScope, ctxFun);
 
 export const OnUser = (...values: string[]) =>
   OnContext((ctx) => ctx.user(...values));
@@ -150,7 +151,7 @@ export const OnSelection = (selection: Selection) =>
 // Command definition
 
 export const CommandDef = (def: CommandDefinitionFun): MethodDecorator =>
-  SetExtraMetadata<string, CommandDefinitionFun>(KoishiCommandDefinition, def);
+  SetExtraMetadata(KoishiCommandDefinition, def);
 
 export const CommandDescription = (desc: string) =>
   CommandDef((cmd) => {
@@ -244,7 +245,9 @@ export function WireContextService(name?: string): PropertyDecorator {
   };
 }
 
-export function ProvideContextService(name: string): ClassDecorator {
-  Context.service(name as keyof Context.Services);
+export function ProvideContextService(
+  name: keyof Context.Services,
+): ClassDecorator {
+  Context.service(name);
   return SetExtraMetadata(KoishiServiceProvideSym, name);
 }

src/koishi.module.ts

@@ -17,8 +17,6 @@ import {
   KOISHI_MODULE_OPTIONS,
 } from './utility/koishi.constants';
 import { KoishiMiddleware } from './providers/koishi.middleware';
-import { createServer } from 'http';
-import { AddressInfo } from 'net';
 import { KoishiLoggerService } from './providers/koishi-logger.service';
 import { KoishiMetascanService } from './providers/koishi-metascan.service';
 import { DiscoveryModule, INQUIRER } from '@nestjs/core';
@@ -28,6 +26,7 @@ import { KoishiInjectionService } from './providers/koishi-injection.service';
 import { KoishiContextService } from './providers/koishi-context.service';
 import { KoishiHttpDiscoveryService } from './koishi-http-discovery/koishi-http-discovery.service';
 import { KoishiWebsocketGateway } from './providers/koishi-websocket.gateway';
+import { KoishiMetadataFetcherService } from './koishi-metadata-fetcher/koishi-metadata-fetcher.service';
 
 const koishiContextProvider: Provider<Context> = {
   provide: KOISHI_CONTEXT,
@@ -47,6 +46,7 @@ const koishiContextProvider: Provider<Context> = {
     KoishiContextService,
     KoishiInjectionService,
     KoishiHttpDiscoveryService,
+    KoishiMetadataFetcherService,
   ],
   exports: [KoishiService, koishiContextProvider],
 })

src/providers/koishi-metascan.service.ts

 import { Injectable } from '@nestjs/common';
-import {
-  AbstractHttpAdapter,
-  HttpAdapterHost,
-  MetadataScanner,
-  ModuleRef,
-  ModulesContainer,
-  Reflector,
-} from '@nestjs/core';
+import { MetadataScanner, ModuleRef, ModulesContainer } from '@nestjs/core';
 import { Argv, Command, Context, User } from 'koishi';
 import { InstanceWrapper } from '@nestjs/core/injector/instance-wrapper';
 import {
@@ -18,26 +11,25 @@ import {
   KoishiServiceWireProperty,
 } from '../utility/koishi.constants';
 import {
-  CommandDefinitionFun,
   CommandPutConfig,
   DoRegisterConfig,
   EventName,
   KoishiModulePlugin,
-  OnContextFunction,
 } from '../koishi.interfaces';
 import { applySelector } from '../utility/koishi.utility';
 import _ from 'lodash';
 import { KoishiContextService } from './koishi-context.service';
 import { Module } from '@nestjs/core/injector/module';
+import { KoishiMetadataFetcherService } from '../koishi-metadata-fetcher/koishi-metadata-fetcher.service';
 
 @Injectable()
 export class KoishiMetascanService {
   constructor(
     private readonly metadataScanner: MetadataScanner,
-    private readonly reflector: Reflector,
     private readonly moduleRef: ModuleRef,
     private readonly moduleContainer: ModulesContainer,
     private readonly ctxService: KoishiContextService,
+    private readonly metaFetcher: KoishiMetadataFetcherService,
   ) {}
 
   private preRegisterCommandActionArg(config: CommandPutConfig, cmd: Command) {
@@ -119,32 +111,19 @@ export class KoishiMetascanService {
     methodKey: string,
   ) {
     const methodFun: (...args: any[]) => any = instance[methodKey];
-    const regData: DoRegisterConfig = this.reflector.get(
-      KoishiDoRegister,
-      methodFun,
-    );
+    const regData = this.metaFetcher.getMetadata(KoishiDoRegister, methodFun);
     if (!regData) {
       return;
     }
     let baseContext = ctx;
-    const instanceContextFilters: OnContextFunction[] = this.reflector.get(
-      KoishiOnContextScope,
-      instance.constructor,
-    );
-    if (instanceContextFilters) {
-      for (const filter of instanceContextFilters) {
-        baseContext = filter(baseContext) || baseContext;
-      }
-    }
-    const methodContextFilters: OnContextFunction[] = this.reflector.get(
+    const contextFilters = this.metaFetcher.getPropertyMetadataArray(
       KoishiOnContextScope,
-      methodFun,
+      instance,
+      methodKey,
     );
-    if (methodContextFilters) {
-      for (const filter of methodContextFilters) {
+    for (const filter of contextFilters) {
       baseContext = filter(baseContext) || baseContext;
     }
-    }
     switch (regData.type) {
       case 'middleware':
         const { data: midPrepend } = regData as DoRegisterConfig<'middleware'>;
@@ -184,9 +163,9 @@ export class KoishiMetascanService {
           commandData.desc,
           commandData.config,
         );
-        const commandDefs: CommandDefinitionFun[] = this.reflector.get(
+        const commandDefs = this.metaFetcher.getMetadataArray(
           KoishiCommandDefinition,
-          methodFun,
+          methodFun(),
         );
         if (commandDefs) {
           for (const commandDef of commandDefs) {
@@ -234,16 +213,14 @@ export class KoishiMetascanService {
   }
 
   private scanInstanceForProvidingContextService(ctx: Context, instance: any) {
-    const providingServiceNames: string[] = this.reflector.get(
+    const providingServiceNames = this.metaFetcher.getMetadataArray(
       KoishiServiceProvideSym,
       instance.constructor,
     );
-    if (providingServiceNames) {
     for (const name of providingServiceNames) {
       ctx[name] = instance;
     }
   }
-  }
 
   private scanInstanceForWireContextService(ctx: Context, instance: any) {
     const instanceClass = instance.constructor;

src/utility/koishi.constants.ts

 // Injections
+import {
+  CommandDefinitionFun,
+  DoRegisterConfig,
+  OnContextFunction,
+} from '../koishi.interfaces';
+import { Context } from 'koishi';
+
 export const KOISHI_MODULE_OPTIONS = 'KOISHI_MODULE_OPTIONS';
 export const KOISHI_CONTEXT = 'KOISHI_CONTEXT';
 
@@ -6,8 +13,25 @@ export const KOISHI_CONTEXT = 'KOISHI_CONTEXT';
 export const KoishiOnContextScope = 'KoishiOnContextScope';
 export const KoishiDoRegister = 'KoishiDoRegister';
 export const KoishiCommandDefinition = 'KoishiCommandDefinition';
-export const KoishiCommandPutDef = Symbol('KoishiCommandPutDef');
+export const KoishiCommandPutDef = 'KoishiCommandPutDef';
 
-export const KoishiServiceWireProperty = Symbol('KoishiServiceWireProperty');
-export const KoishiServiceWireKeys = Symbol('KoishiServiceWireKeys');
+export const KoishiServiceWireProperty = 'KoishiServiceWireProperty';
+export const KoishiServiceWireKeys = 'KoishiServiceWireKeys';
 export const KoishiServiceProvideSym = 'KoishiServiceProvideSym';
+
+// metadata map
+
+export interface MetadataArrayMap {
+  KoishiOnContextScope: OnContextFunction;
+  KoishiCommandDefinition: CommandDefinitionFun;
+  KoishiServiceProvideSym: keyof Context.Services;
+}
+
+export interface MetadataMap {
+  KoishiDoRegister: DoRegisterConfig;
+}
+
+export type MetadataGenericMap = {
+  [K in keyof MetadataArrayMap]: MetadataArrayMap[K][];
+} &
+  MetadataMap;