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createHttpLink.ts
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createHttpLink.ts
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import { DefinitionNode } from 'graphql';
import { Observable } from '../../utilities/observables/Observable';
import { serializeFetchParameter } from './serializeFetchParameter';
import { selectURI } from './selectURI';
import { parseAndCheckHttpResponse } from './parseAndCheckHttpResponse';
import { checkFetcher } from './checkFetcher';
import {
selectHttpOptionsAndBody,
fallbackHttpConfig,
HttpOptions
} from './selectHttpOptionsAndBody';
import { createSignalIfSupported } from './createSignalIfSupported';
import { rewriteURIForGET } from './rewriteURIForGET';
import { ApolloLink } from '../core/ApolloLink';
import { fromError } from '../utils/fromError';
export const createHttpLink = (linkOptions: HttpOptions = {}) => {
let {
uri = '/graphql',
// use default global fetch if nothing passed in
fetch: fetcher,
includeExtensions,
useGETForQueries,
...requestOptions
} = linkOptions;
// dev warnings to ensure fetch is present
checkFetcher(fetcher);
//fetcher is set here rather than the destructuring to ensure fetch is
//declared before referencing it. Reference in the destructuring would cause
//a ReferenceError
if (!fetcher) {
fetcher = fetch;
}
const linkConfig = {
http: { includeExtensions },
options: requestOptions.fetchOptions,
credentials: requestOptions.credentials,
headers: requestOptions.headers,
};
return new ApolloLink(operation => {
let chosenURI = selectURI(operation, uri);
const context = operation.getContext();
// `apollographql-client-*` headers are automatically set if a
// `clientAwareness` object is found in the context. These headers are
// set first, followed by the rest of the headers pulled from
// `context.headers`. If desired, `apollographql-client-*` headers set by
// the `clientAwareness` object can be overridden by
// `apollographql-client-*` headers set in `context.headers`.
const clientAwarenessHeaders: {
'apollographql-client-name'?: string;
'apollographql-client-version'?: string;
} = {};
if (context.clientAwareness) {
const { name, version } = context.clientAwareness;
if (name) {
clientAwarenessHeaders['apollographql-client-name'] = name;
}
if (version) {
clientAwarenessHeaders['apollographql-client-version'] = version;
}
}
const contextHeaders = { ...clientAwarenessHeaders, ...context.headers };
const contextConfig = {
http: context.http,
options: context.fetchOptions,
credentials: context.credentials,
headers: contextHeaders,
};
//uses fallback, link, and then context to build options
const { options, body } = selectHttpOptionsAndBody(
operation,
fallbackHttpConfig,
linkConfig,
contextConfig,
);
let controller: any;
if (!(options as any).signal) {
const { controller: _controller, signal } = createSignalIfSupported();
controller = _controller;
if (controller) (options as any).signal = signal;
}
// If requested, set method to GET if there are no mutations.
const definitionIsMutation = (d: DefinitionNode) => {
return d.kind === 'OperationDefinition' && d.operation === 'mutation';
};
if (
useGETForQueries &&
!operation.query.definitions.some(definitionIsMutation)
) {
options.method = 'GET';
}
if (options.method === 'GET') {
const { newURI, parseError } = rewriteURIForGET(chosenURI, body);
if (parseError) {
return fromError(parseError);
}
chosenURI = newURI;
} else {
try {
(options as any).body = serializeFetchParameter(body, 'Payload');
} catch (parseError) {
return fromError(parseError);
}
}
return new Observable(observer => {
fetcher!(chosenURI, options)
.then(response => {
operation.setContext({ response });
return response;
})
.then(parseAndCheckHttpResponse(operation))
.then(result => {
// we have data and can send it to back up the link chain
observer.next(result);
observer.complete();
return result;
})
.catch(err => {
// fetch was cancelled so it's already been cleaned up in the unsubscribe
if (err.name === 'AbortError') return;
// if it is a network error, BUT there is graphql result info
// fire the next observer before calling error
// this gives apollo-client (and react-apollo) the `graphqlErrors` and `networErrors`
// to pass to UI
// this should only happen if we *also* have data as part of the response key per
// the spec
if (err.result && err.result.errors && err.result.data) {
// if we don't call next, the UI can only show networkError because AC didn't
// get any graphqlErrors
// this is graphql execution result info (i.e errors and possibly data)
// this is because there is no formal spec how errors should translate to
// http status codes. So an auth error (401) could have both data
// from a public field, errors from a private field, and a status of 401
// {
// user { // this will have errors
// firstName
// }
// products { // this is public so will have data
// cost
// }
// }
//
// the result of above *could* look like this:
// {
// data: { products: [{ cost: "$10" }] },
// errors: [{
// message: 'your session has timed out',
// path: []
// }]
// }
// status code of above would be a 401
// in the UI you want to show data where you can, errors as data where you can
// and use correct http status codes
observer.next(err.result);
}
observer.error(err);
});
return () => {
// XXX support canceling this request
// https://developers.google.com/web/updates/2017/09/abortable-fetch
if (controller) controller.abort();
};
});
});
};