observe()

in packages/rum-angular/src/apm.service.ts [61:111]

• 35 lines of code
• 11 McCabe index (conditional complexity)

  observe() {
    let transaction
    this.router.events.subscribe(event => {
      const eventName = event.toString()
      if (eventName.indexOf('NavigationStart') >= 0) {
        const name = (event as NavigationStart).url
        transaction = this.apm.startTransaction(name, 'route-change', {
          managed: true,
          canReuse: true
        })
      } else if (eventName.indexOf('NavigationError') >= 0) {
        transaction && transaction.detectFinish()
      } else if (eventName.indexOf('NavigationEnd') >= 0) {
        if (!transaction) {
          return
        }

        /**
         * The below logic must be placed in NavigationEnd since
         * the we depend on the current route state to get the path
         *
         * Even If there are any redirects, the router state path
         * will be matched with the correct url on navigation end
         *
         * Traverse the activated route tree to figure out the nested
         * route path
         */
        const route = this.router.routerState.root.firstChild

        if (route) {
          let child = route
          let path = '/' + child.routeConfig.path
          while (child) {
            child = child.firstChild
            if (child && child.routeConfig) {
              const currentPath = child.routeConfig.path
              /**
               * Ignore empty path's in the route config
               */
              if (currentPath) {
                path += '/' + currentPath
              }
            }
          }
          transaction.name = path
        }

        afterFrame(() => transaction.detectFinish())
      }
    })
  }