NodeJS仿WebApi路由示例

param

export function BodyParam(target: BaseController, name: string, index: number) {
  setParamDecorator(target, name, index, { name: "", type: ParamType.Body });
}
function setParamDecorator(target: BaseController, name: string, index: number, value: {name: string, type: ParamType}) {
  let paramTypes = Reflect.getMetadata("design:paramtypes", target, name);
  target[Router] = target[Router] || {};
  target[Router][name] = target[Router][name] || {};
  target[Router][name].params = target[Router][name].params || [];
  target[Router][name].params[index] = { type: paramTypes[index], name: value.name, paramType: value.type };
}

这样装饰的数据就存到对象的Router属性上，后面构建路由时就可以用了。

绑定路由到

Koa-router

上面从物理路径得到了路由，但是是以装饰里的参数路径优先，所以先看看刚在存在原型里的

Router

Path

Path

private setRouterForClass(exportClass: any, file: string) { 
  let controllerRouterPath = this.buildControllerRouter(file);
  let controller = new exportClass();
  for(let funcName in exportClass.prototype[Router]){
    let method = exportClass.prototype[Router][funcName].method.toLowerCase();
    let path = exportClass.prototype[Router][funcName].path;
    this.setRouterForFunction(method, controller, funcName, path ? `/${this.urlPrefix}${path}` : `/${this.urlPrefix}${controllerRouterPath}/${funcName}`);
  }
}

给controller里的方法参数赋上值并绑定路由到

KoaRouter

private setRouterForFunction(method: string, controller: any, funcName: string, routerPath: string){
  this.koaRouter[method](routerPath, async (ctx, next) => { await this.execApi(ctx, next, controller, funcName) });
}
private async execApi(ctx: Koa.Context, next: Function, controller: any, funcName: string) : Promise<void> { //这里就是执行controller的api方法了
  try
  {
    ctx.body = await controller[funcName](...this.buildFuncParams(ctx, controller, controller[funcName]));
  }
  catch(err)
  {
    console.error(err);
    next();
  }
}
private buildFuncParams(ctx: any, controller: any, func: Function) { //把参数具体的值收集起来
  let paramsInfo = controller[Router][func.name].params;
  let params = [];
  if(paramsInfo)
  {
    for(let i = 0; i < paramsInfo.length; i++) {								 
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