Links y Agrupación de Solicitudes
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Similar a los exchanges de urql o los links de Apollo. Los Links te permiten personalizar el flujo de datos entre el cliente tRPC y el servidor tRPC.
Agrupación de Solicitudes
La agrupación de solicitudes está activada automáticamente, lo que combina tus peticiones al servidor. Esto permite que el siguiente código produzca exactamente una solicitud HTTP y en el servidor exactamente una consulta a la base de datos:
ts// below will be done in the same request when batching is enabledconst somePosts = await Promise.all([client.query('post.byId', 1),client.query('post.byId', 2),client.query('post.byId', 3),]);
ts// below will be done in the same request when batching is enabledconst somePosts = await Promise.all([client.query('post.byId', 1),client.query('post.byId', 2),client.query('post.byId', 3),]);
Personalización del flujo de datos
Los siguientes ejemplos asumen que usas Next.js, pero puedes aplicar lo mismo si utilizas el cliente vanilla de tRPC
Establecer un tamaño máximo de lote
Esto limita la cantidad de solicitudes que pueden enviarse juntas en un lote (útil para evitar que la URL crezca demasiado y genere un error HTTP 413).
server.tsts// 👇 import the httpBatchLinkimport { httpBatchLink } from '@trpc/client/links/httpBatchLink';import { withTRPC } from '@trpc/next';import { AppType } from 'next/dist/shared/lib/utils';import type { AppRouter } from 'pages/api/trpc/[trpc]';const MyApp: AppType = ({ Component, pageProps }) => {return <Component {...pageProps} />;};export default withTRPC<AppRouter>({config() {return {links: [httpBatchLink({url: '/api/trpc',maxBatchSize: 10, // a reasonable size}),],};},})(MyApp);
server.tsts// 👇 import the httpBatchLinkimport { httpBatchLink } from '@trpc/client/links/httpBatchLink';import { withTRPC } from '@trpc/next';import { AppType } from 'next/dist/shared/lib/utils';import type { AppRouter } from 'pages/api/trpc/[trpc]';const MyApp: AppType = ({ Component, pageProps }) => {return <Component {...pageProps} />;};export default withTRPC<AppRouter>({config() {return {links: [httpBatchLink({url: '/api/trpc',maxBatchSize: 10, // a reasonable size}),],};},})(MyApp);
Deshabilitar la agrupación de solicitudes
1. Desactiva batching en tu servidor:
En tu [trpc].ts:
pages/api/trpc/[trpc].tstsexport default trpcNext.createNextApiHandler({// [...]// 👇 disable batchingbatching: {enabled: false,},});
pages/api/trpc/[trpc].tstsexport default trpcNext.createNextApiHandler({// [...]// 👇 disable batchingbatching: {enabled: false,},});
2. Usa un enlace sin agrupación en tu cliente tRPC
pages/_app.tsxtsx// 👇 import the httpLinkimport { httpLink } from '@trpc/client/links/httpLink';import { withTRPC } from '@trpc/next';import { AppType } from 'next/dist/shared/lib/utils';import type { AppRouter } from 'pages/api/trpc/[trpc]';const MyApp: AppType = ({ Component, pageProps }) => {return <Component {...pageProps} />;};export default withTRPC<AppRouter>({config() {return {links: [httpLink({url: '/api/trpc',}),],};},// ssr: false,})(MyApp);
pages/_app.tsxtsx// 👇 import the httpLinkimport { httpLink } from '@trpc/client/links/httpLink';import { withTRPC } from '@trpc/next';import { AppType } from 'next/dist/shared/lib/utils';import type { AppRouter } from 'pages/api/trpc/[trpc]';const MyApp: AppType = ({ Component, pageProps }) => {return <Component {...pageProps} />;};export default withTRPC<AppRouter>({config() {return {links: [httpLink({url: '/api/trpc',}),],};},// ssr: false,})(MyApp);
Usar un splitLink para controlar el flujo de solicitudes
Deshabilitar agrupación para solicitudes específicas
1. Configura el cliente / _app.tsx
pages/_app.tsxtsximport { httpBatchLink } from '@trpc/client/links/httpBatchLink';import { httpLink } from '@trpc/client/links/httpLink';import { splitLink } from '@trpc/client/links/splitLink';import { withTRPC } from '@trpc/next';// [..]export default withTRPC<AppRouter>({config() {const url = `http://localhost:3000`;return {links: [splitLink({condition(op) {// check for context property `skipBatch`return op.context.skipBatch === true;},// when condition is true, use normal requesttrue: httpLink({url,}),// when condition is false, use batchingfalse: httpBatchLink({url,}),}),],};},})(MyApp);
pages/_app.tsxtsximport { httpBatchLink } from '@trpc/client/links/httpBatchLink';import { httpLink } from '@trpc/client/links/httpLink';import { splitLink } from '@trpc/client/links/splitLink';import { withTRPC } from '@trpc/next';// [..]export default withTRPC<AppRouter>({config() {const url = `http://localhost:3000`;return {links: [splitLink({condition(op) {// check for context property `skipBatch`return op.context.skipBatch === true;},// when condition is true, use normal requesttrue: httpLink({url,}),// when condition is false, use batchingfalse: httpBatchLink({url,}),}),],};},})(MyApp);
2. Realiza la solicitud sin agrupación
MyComponent.tsxtsxexport function MyComponent() {const postsQuery = trpc.useQuery(['posts'], {context: {skipBatch: true,},});return (<pre>{JSON.stringify(postsQuery.data ?? null, null, 4)}</pre>)})
MyComponent.tsxtsxexport function MyComponent() {const postsQuery = trpc.useQuery(['posts'], {context: {skipBatch: true,},});return (<pre>{JSON.stringify(postsQuery.data ?? null, null, 4)}</pre>)})
o:
client.tstsconst postResult = client.query('posts', null, {context: {skipBatch: true,},});
client.tstsconst postResult = client.query('posts', null, {context: {skipBatch: true,},});
Crear un enlace personalizado
pages/_app.tsxtsximport { TRPCLink } from '@trpc/client';import type { AppRouter } from 'pages/api/trpc/[trpc]';const customLink: TRPCLink<AppRouter> = (runtime) => {// here we just got initialized in the app - this happens once per app// useful for storing cache for instancereturn ({ prev, next, op }) => {// this is when passing the result to the next linknext(op, (result) => {// this is when we've gotten result from the serverif (result instanceof Error) {// maybe send to bugsnag?}prev(result);});};};export default withTRPC<AppRouter>({config() {return {links: [customLink,// [..]// ❗ Make sure to end with a `httpBatchLink` or `httpLink`],};},// ssr: false})(MyApp);
pages/_app.tsxtsximport { TRPCLink } from '@trpc/client';import type { AppRouter } from 'pages/api/trpc/[trpc]';const customLink: TRPCLink<AppRouter> = (runtime) => {// here we just got initialized in the app - this happens once per app// useful for storing cache for instancereturn ({ prev, next, op }) => {// this is when passing the result to the next linknext(op, (result) => {// this is when we've gotten result from the serverif (result instanceof Error) {// maybe send to bugsnag?}prev(result);});};};export default withTRPC<AppRouter>({config() {return {links: [customLink,// [..]// ❗ Make sure to end with a `httpBatchLink` or `httpLink`],};},// ssr: false})(MyApp);