'Fetch the Right Data With Next.js and React SSR' react graphql
That was a quick one! Let's move on to the next pattern, lazy loading.As discussed in the problem statement, some of our operations should be executed only after a specific event. Until then, the execution should be deferred.Setting lazy to true configures the hook to be "lazy". Now, let's look at the implementation:
The answer will be somewhere in the middle, but it's definitely not 17 times. So, how can we implement this behavior? Let's have a look at the useQuery hook implementation. Increasing the debounce counter will trigger the first useEffect, as the debounce counter is a dependency. If the debounce counter is 0, which is the initial value, we immediately return, as there is nothing to do. Otherwise, we start a timer using setTimeout.
Let's now look operations that require the user to be authenticated. We'll start with a server-side protected Query.Let's say we're rendering a dashboard that requires the user to be authenticated. The dashboard will also show user-specific data. How can we implement this?const {ssrCache, client, isWindowFocused, refetchMountedOperations, user}=useContext; const isServer=typeof window==='undefined'; const ssrEnabled=args?.disableSSR !==true && args?.
As you can see, we've now added the user object to the dependencies of the effect. If the query requires authentication, but the user object is null, we set the query result to "requires_authentication" and return early, no fetch is happening. If we pass this check, the query is fired as usual. Making the user object a dependency of the fetch effect also has two nice side-effects.
If you're using server-side protected queries, client-side navigation is not handled properly. On the other hand, if we're only using client-side protected queries, we will always have the nasty flickering again. To solve these issues, we have to put both of these patterns together, which leads us to the universal-protected query pattern.This pattern doesn't require any additional changes as we've already implemented all the logic.
Similarly to the protected query pattern, we're injecting the user object from the context into the callback. If the mutation requires authentication, we check if the user is null. If the user is null, we set the result to "requires_authentication" and return early. That's because mutations are always triggered by user interaction. So, there's no need for us to implement anything on the server.
We call this state object "refetchMountedOperationsOnSuccess", which is a simple counter. In case our mutation callback was successful, we want to increment the counter. This should be enough to invalidate all currently mounted queries.
The implementation of this hook is similar to the query hook. It's automatically triggered when the enclosing component mounts, so we're using the "useEffect" hook again. It's important to pass an abort signal to the client to ensure that the subscription is aborted when the component unmounts. For this to work, we introduce a new stateful variable called "stop". The default state will be false, but when the user blurs the window, we'll set the state to true. If they re-enter the window , we'll set the state back to false. If the developer set "stopOnWindowBlur" to false, we'll ignore this, which can be configured in the "args" object of the subscriptions.
If you're a regular reader of this blog, you might be aware of our Subscription Implementation. [As we've described in another blog , we've implemented GraphQL subscriptions in a way that is compatible with the EventSource as well as the Fetch API. The implementation of the subscription client looks similar to the query client, except that we use the EventSource API with a callback. If EventSource is not available, we fall back to the Fetch API, but I'll keep the implementation out of the blog post as it doesn't add much extra value.
Similarly to the useQuery hook, we add a code branch for the server-side rendering. If we're on the server and don't yet have any data, we make a "query" request with the subscribeOnce flag set to true. First, we have to add the user as a dependency to the effect. This will make the effect trigger whenever the user changes. Then, we have to check the meta-data of the subscription and see if it requires authentication.
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