apollo-angular
Version:
Use your GraphQL data in your Angular app, with the Apollo Client
149 lines • 19.8 kB
JavaScript
import { print } from 'graphql';
import { Injectable } from '@angular/core';
import { ApolloLink, Observable as LinkObservable, } from '@apollo/client/core';
import { BatchLink } from '@apollo/client/link/batch';
import { createHeadersWithClientAwareness, fetch, mergeHeaders, prioritize } from './utils';
import * as i0 from "@angular/core";
import * as i1 from "@angular/common/http";
export const defaults = {
batchInterval: 10,
batchMax: 10,
uri: 'graphql',
method: 'POST',
withCredentials: false,
includeQuery: true,
includeExtensions: false,
useMultipart: false,
};
/**
* Decides which value to pick from Context, Options or defaults
*/
export function pick(context, options, key) {
return prioritize(context[key], options[key], defaults[key]);
}
export class HttpBatchLinkHandler extends ApolloLink {
httpClient;
options;
batcher;
batchInterval;
batchMax;
print = print;
constructor(httpClient, options) {
super();
this.httpClient = httpClient;
this.options = options;
this.batchInterval = options.batchInterval || defaults.batchInterval;
this.batchMax = options.batchMax || defaults.batchMax;
if (this.options.operationPrinter) {
this.print = this.options.operationPrinter;
}
const batchHandler = (operations) => {
return new LinkObservable((observer) => {
const body = this.createBody(operations);
const headers = this.createHeaders(operations);
const { method, uri, withCredentials } = this.createOptions(operations);
if (typeof uri === 'function') {
throw new Error(`Option 'uri' is a function, should be a string`);
}
const req = {
method,
url: uri,
body: body,
options: {
withCredentials,
headers,
},
};
const sub = fetch(req, this.httpClient, () => {
throw new Error('File upload is not available when combined with Batching');
}).subscribe({
next: result => observer.next(result.body),
error: err => observer.error(err),
complete: () => observer.complete(),
});
return () => {
if (!sub.closed) {
sub.unsubscribe();
}
};
});
};
const batchKey = options.batchKey ||
((operation) => {
return this.createBatchKey(operation);
});
this.batcher = new BatchLink({
batchInterval: this.batchInterval,
batchMax: this.batchMax,
batchKey,
batchHandler,
});
}
createOptions(operations) {
const context = operations[0].getContext();
return {
method: pick(context, this.options, 'method'),
uri: pick(context, this.options, 'uri'),
withCredentials: pick(context, this.options, 'withCredentials'),
};
}
createBody(operations) {
return operations.map(operation => {
const includeExtensions = prioritize(operation.getContext().includeExtensions, this.options.includeExtensions, false);
const includeQuery = prioritize(operation.getContext().includeQuery, this.options.includeQuery, true);
const body = {
operationName: operation.operationName,
variables: operation.variables,
};
if (includeExtensions) {
body.extensions = operation.extensions;
}
if (includeQuery) {
body.query = this.print(operation.query);
}
return body;
});
}
createHeaders(operations) {
return operations.reduce((headers, operation) => {
return mergeHeaders(headers, operation.getContext().headers);
}, createHeadersWithClientAwareness({
headers: this.options.headers,
clientAwareness: operations[0]?.getContext()?.clientAwareness,
}));
}
createBatchKey(operation) {
const context = operation.getContext();
if (context.skipBatching) {
return Math.random().toString(36).substring(2, 11);
}
const headers = context.headers && context.headers.keys().map((k) => context.headers.get(k));
const opts = JSON.stringify({
includeQuery: context.includeQuery,
includeExtensions: context.includeExtensions,
headers,
});
return prioritize(context.uri, this.options.uri, '') + opts;
}
request(op) {
return this.batcher.request(op);
}
}
export class HttpBatchLink {
httpClient;
constructor(httpClient) {
this.httpClient = httpClient;
}
create(options) {
return new HttpBatchLinkHandler(this.httpClient, options);
}
static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.0.5", ngImport: i0, type: HttpBatchLink, deps: [{ token: i1.HttpClient }], target: i0.ɵɵFactoryTarget.Injectable });
static ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "18.0.5", ngImport: i0, type: HttpBatchLink, providedIn: 'root' });
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.0.5", ngImport: i0, type: HttpBatchLink, decorators: [{
type: Injectable,
args: [{
providedIn: 'root',
}]
}], ctorParameters: () => [{ type: i1.HttpClient }] });
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{ print } from 'graphql';\nimport { HttpClient, HttpHeaders } from '@angular/common/http';\nimport { Injectable } from '@angular/core';\nimport {\n  ApolloLink,\n  FetchResult,\n  Observable as LinkObservable,\n  Operation,\n} from '@apollo/client/core';\nimport { BatchHandler, BatchLink } from '@apollo/client/link/batch';\nimport { BatchOptions, Body, Context, OperationPrinter, Options, Request } from './types';\nimport { createHeadersWithClientAwareness, fetch, mergeHeaders, prioritize } from './utils';\n\nexport const defaults = {\n  batchInterval: 10,\n  batchMax: 10,\n  uri: 'graphql',\n  method: 'POST',\n  withCredentials: false,\n  includeQuery: true,\n  includeExtensions: false,\n  useMultipart: false,\n} as const;\n\n/**\n * Decides which value to pick from Context, Options or defaults\n */\nexport function pick<K extends keyof Omit<typeof defaults, 'batchInterval' | 'batchMax'>>(\n  context: Context,\n  options: Options,\n  key: K,\n): ReturnType<typeof prioritize<Context[K] | Options[K] | (typeof defaults)[K]>> {\n  return prioritize(context[key], options[key], defaults[key]);\n}\n\nexport class HttpBatchLinkHandler extends ApolloLink {\n  public batcher: ApolloLink;\n  private batchInterval: number;\n  private batchMax: number;\n  private print: OperationPrinter = print;\n\n  constructor(\n    private readonly httpClient: HttpClient,\n    private readonly options: BatchOptions,\n  ) {\n    super();\n\n    this.batchInterval = options.batchInterval || defaults.batchInterval;\n    this.batchMax = options.batchMax || defaults.batchMax;\n\n    if (this.options.operationPrinter) {\n      this.print = this.options.operationPrinter;\n    }\n\n    const batchHandler: BatchHandler = (operations: Operation[]) => {\n      return new LinkObservable((observer: any) => {\n        const body = this.createBody(operations);\n        const headers = this.createHeaders(operations);\n        const { method, uri, withCredentials } = this.createOptions(operations);\n\n        if (typeof uri === 'function') {\n          throw new Error(`Option 'uri' is a function, should be a string`);\n        }\n\n        const req: Request = {\n          method,\n          url: uri,\n          body: body,\n          options: {\n            withCredentials,\n            headers,\n          },\n        };\n\n        const sub = fetch(req, this.httpClient, () => {\n          throw new Error('File upload is not available when combined with Batching');\n        }).subscribe({\n          next: result => observer.next(result.body),\n          error: err => observer.error(err),\n          complete: () => observer.complete(),\n        });\n\n        return () => {\n          if (!sub.closed) {\n            sub.unsubscribe();\n          }\n        };\n      });\n    };\n\n    const batchKey =\n      options.batchKey ||\n      ((operation: Operation) => {\n        return this.createBatchKey(operation);\n      });\n\n    this.batcher = new BatchLink({\n      batchInterval: this.batchInterval,\n      batchMax: this.batchMax,\n      batchKey,\n      batchHandler,\n    });\n  }\n\n  private createOptions(\n    operations: Operation[],\n  ): Required<Pick<Options, 'method' | 'uri' | 'withCredentials'>> {\n    const context: Context = operations[0].getContext();\n\n    return {\n      method: pick(context, this.options, 'method'),\n      uri: pick(context, this.options, 'uri'),\n      withCredentials: pick(context, this.options, 'withCredentials'),\n    };\n  }\n\n  private createBody(operations: Operation[]): Body[] {\n    return operations.map(operation => {\n      const includeExtensions = prioritize(\n        operation.getContext().includeExtensions,\n        this.options.includeExtensions,\n        false,\n      );\n      const includeQuery = prioritize(\n        operation.getContext().includeQuery,\n        this.options.includeQuery,\n        true,\n      );\n\n      const body: Body = {\n        operationName: operation.operationName,\n        variables: operation.variables,\n      };\n\n      if (includeExtensions) {\n        body.extensions = operation.extensions;\n      }\n\n      if (includeQuery) {\n        body.query = this.print(operation.query);\n      }\n\n      return body;\n    });\n  }\n\n  private createHeaders(operations: Operation[]): HttpHeaders {\n    return operations.reduce(\n      (headers: HttpHeaders, operation: Operation) => {\n        return mergeHeaders(headers, operation.getContext().headers);\n      },\n      createHeadersWithClientAwareness({\n        headers: this.options.headers,\n        clientAwareness: operations[0]?.getContext()?.clientAwareness,\n      }),\n    );\n  }\n\n  private createBatchKey(operation: Operation): string {\n    const context: Context & { skipBatching?: boolean } = operation.getContext();\n\n    if (context.skipBatching) {\n      return Math.random().toString(36).substring(2, 11);\n    }\n\n    const headers =\n      context.headers && context.headers.keys().map((k: string) => context.headers!.get(k));\n\n    const opts = JSON.stringify({\n      includeQuery: context.includeQuery,\n      includeExtensions: context.includeExtensions,\n      headers,\n    });\n\n    return prioritize(context.uri, this.options.uri, '') + opts;\n  }\n\n  public request(op: Operation): LinkObservable<FetchResult> | null {\n    return this.batcher.request(op);\n  }\n}\n\n@Injectable({\n  providedIn: 'root',\n})\nexport class HttpBatchLink {\n  constructor(private readonly httpClient: HttpClient) {}\n\n  public create(options: BatchOptions): HttpBatchLinkHandler {\n    return new HttpBatchLinkHandler(this.httpClient, options);\n  }\n}\n"]}