impress-2020/src/app/apolloClient.js

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import { ApolloClient, createHttpLink, InMemoryCache } from "@apollo/client";
import { setContext } from "@apollo/client/link/context";
import { createPersistedQueryLink } from "apollo-link-persisted-queries";
import cachedZones from "./cached-data/zones.json";
// Teach Apollo to load certain fields from the cache, to avoid extra network
// requests. This happens a lot - e.g. reusing data from item search on the
// outfit immediately!
const typePolicies = {
Query: {
fields: {
allZones: (_, { toReference }) => {
return cachedZones.map((z) =>
toReference({ __typename: "Zone", id: z.id }, true)
);
},
items: (_, { args, toReference }) => {
return args.ids.map((id) =>
toReference({ __typename: "Item", id }, true)
);
},
item: (_, { args, toReference }) => {
return toReference({ __typename: "Item", id: args.id }, true);
},
petAppearanceById: (_, { args, toReference }) => {
return toReference({ __typename: "PetAppearance", id: args.id }, true);
},
species: (_, { args, toReference }) => {
return toReference({ __typename: "Species", id: args.id }, true);
},
color: (_, { args, toReference }) => {
return toReference({ __typename: "Color", id: args.id }, true);
},
outfit: (_, { args, toReference }) => {
return toReference({ __typename: "Outfit", id: args.id }, true);
},
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user: (_, { args, toReference }) => {
return toReference({ __typename: "User", id: args.id }, true);
},
},
},
Item: {
fields: {
appearanceOn: (appearance, { args, readField, toReference }) => {
// If we already have this exact appearance in the cache, serve it!
if (appearance) {
return appearance;
}
// Otherwise, we're going to see if this is a standard color, in which
// case we can reuse the standard color appearance if we already have
// it! This helps for fast loading when switching between standard
// colors.
const { speciesId, colorId } = args;
const speciesStandardBodyId = readField(
"standardBodyId",
toReference({ __typename: "Species", id: speciesId })
);
const colorIsStandard = readField(
"isStandard",
toReference({ __typename: "Color", id: colorId })
);
if (speciesStandardBodyId == null || colorIsStandard == null) {
// We haven't loaded all the species/colors into cache yet. We might
// be loading them, depending on the page? Either way, return
// `undefined`, meaning we don't know how to serve this from cache.
// This will cause us to start loading it from the server.
return undefined;
}
if (colorIsStandard) {
const itemId = readField("id");
return toReference({
__typename: "ItemAppearance",
id: `item-${itemId}-body-${speciesStandardBodyId}`,
});
} else {
// This isn't a standard color, so we don't support special
// cross-color caching for it. Return `undefined`, meaning we don't
// know how to serve this from cache. This will cause us to start
// loading it from the server.
return undefined;
}
},
currentUserOwnsThis: (cachedValue, { readField }) => {
if (cachedValue != null) {
return cachedValue;
}
// Do we know what items this user owns? If so, scan for this item.
const currentUserRef = readField("currentUser", {
__ref: "ROOT_QUERY",
});
if (!currentUserRef) {
return undefined;
}
const thisItemId = readField("id");
const itemsTheyOwn = readField("itemsTheyOwn", currentUserRef);
if (!itemsTheyOwn) {
return undefined;
}
const theyOwnThisItem = itemsTheyOwn.some(
(itemRef) => readField("id", itemRef) === thisItemId
);
return theyOwnThisItem;
},
currentUserWantsThis: (cachedValue, { readField }) => {
if (cachedValue != null) {
return cachedValue;
}
// Do we know what items this user owns? If so, scan for this item.
const currentUserRef = readField("currentUser", {
__ref: "ROOT_QUERY",
});
if (!currentUserRef) {
return undefined;
}
const thisItemId = readField("id");
const itemsTheyWant = readField("itemsTheyWant", currentUserRef);
if (!itemsTheyWant) {
return undefined;
}
const theyWantThisItem = itemsTheyWant.some(
(itemRef) => readField("id", itemRef) === thisItemId
);
return theyWantThisItem;
},
},
},
};
// The PersistedQueryLink in front of the HttpLink helps us send cacheable GET
// requests.
const persistedQueryLink = createPersistedQueryLink({
useGETForHashedQueries: true,
});
const httpLink = createHttpLink({ uri: "/api/graphql" });
const buildAuthLink = (getAuth0) =>
setContext(async (_, { headers = {}, sendAuth = false }) => {
if (!sendAuth) {
return;
}
// Wait for auth0 to stop loading, so we can maybe get a token! We'll do
// this hackily by checking every 100ms until it's true.
await new Promise((resolve) => {
function check() {
if (getAuth0().isLoading) {
setTimeout(check, 100);
} else {
resolve();
}
}
check();
});
const { isAuthenticated, getAccessTokenSilently } = getAuth0();
if (isAuthenticated) {
const token = await getAccessTokenSilently();
return {
headers: {
...headers,
authorization: token ? `Bearer ${token}` : "",
},
};
}
});
const initialCache = {};
for (const zone of cachedZones) {
initialCache[`Zone:${zone.id}`] = { __typename: "Zone", ...zone };
}
/**
* apolloClient is the global Apollo Client instance we use for GraphQL
* queries. This is how we communicate with the server!
*/
const buildClient = (getAuth0) =>
new ApolloClient({
link: buildAuthLink(getAuth0).concat(persistedQueryLink).concat(httpLink),
cache: new InMemoryCache({ typePolicies }).restore(initialCache),
connectToDevTools: true,
});
export default buildClient;