@data-client/core
Version:
Async State Management without the Management. REST, GraphQL, SSE, Websockets, Fetch
257 lines (246 loc) • 30.8 kB
JavaScript
import { SET_RESPONSE, FETCH, RESET } from '../actionTypes.js';
import { createSetResponse } from '../controller/actions/index.js';
import Controller from '../controller/Controller.js';
export class ResetError extends Error {
constructor() {
super('Aborted due to RESET');
this.name = 'ResetError';
}
}
/** Handles all async network dispatches
*
* Dedupes concurrent requests by keeping track of all fetches in flight
* and returning existing promises for requests already in flight.
*
* Interfaces with store via a redux-compatible middleware.
*
* @see https://dataclient.io/docs/api/NetworkManager
*/
export default class NetworkManager {
constructor({
dataExpiryLength = 60000,
errorExpiryLength = 1000
} = {}) {
this.fetched = Object.create(null);
this.resolvers = {};
this.rejectors = {};
this.fetchedAt = {};
this.controller = new Controller();
this.middleware = controller => {
this.controller = controller;
return next => action => {
switch (action.type) {
case FETCH:
this.handleFetch(action);
// This is the only case that causes any state change
// It's important to intercept other fetches as we don't want to trigger reducers during
// render - so we need to stop 'readonly' fetches which can be triggered in render
if (action.endpoint.getOptimisticResponse !== undefined && action.endpoint.sideEffect) {
return next(action);
}
return Promise.resolve();
case SET_RESPONSE:
// only set after new state is computed
return next(action).then(() => {
if (action.key in this.fetched) {
var _controller$getState$;
// Note: meta *must* be set by reducer so this should be safe
const error = (_controller$getState$ = controller.getState().meta[action.key]) == null ? void 0 : _controller$getState$.error;
// processing errors result in state meta having error, so we should reject the promise
if (error) {
this.handleSet(createSetResponse(action.endpoint, {
args: action.args,
response: error,
fetchedAt: action.meta.fetchedAt,
error: true
}));
} else {
this.handleSet(action);
}
}
});
case RESET:
{
const rejectors = {
...this.rejectors
};
this.clearAll();
return next(action).then(() => {
// there could be external listeners to the promise
// this must happen after commit so our own rejector knows not to dispatch an error based on this
for (const k in rejectors) {
rejectors[k](new ResetError());
}
});
}
default:
return next(action);
}
};
};
this.dataExpiryLength = dataExpiryLength;
this.errorExpiryLength = errorExpiryLength;
}
/** On mount */
init() {
delete this.cleanupDate;
}
/** Ensures all promises are completed by rejecting remaining. */
cleanup() {
// ensure no dispatches after unmount
// this must be reversible (done in init) so useEffect() remains symmetric
this.cleanupDate = Date.now();
}
/** Used by DevtoolsManager to determine whether to log an action */
skipLogging(action) {
/* istanbul ignore next */
return action.type === FETCH && action.key in this.fetched;
}
allSettled() {
const fetches = Object.values(this.fetched);
if (fetches.length) return Promise.allSettled(fetches);
}
/** Clear all promise state */
clearAll() {
for (const k in this.rejectors) {
this.clear(k);
}
}
/** Clear promise state for a given key */
clear(key) {
this.fetched[key].catch(() => {});
delete this.resolvers[key];
delete this.rejectors[key];
delete this.fetched[key];
delete this.fetchedAt[key];
}
getLastReset() {
if (this.cleanupDate) return this.cleanupDate;
return this.controller.getState().lastReset;
}
/** Called when middleware intercepts 'rdc/fetch' action.
*
* Will then start a promise for a key and potentially start the network
* fetch.
*
* Uses throttle endpoints without sideEffects. This is valuable
* for ensures mutation requests always go through.
*/
handleFetch(action) {
const {
resolve,
reject,
fetchedAt
} = action.meta;
const throttle = !action.endpoint.sideEffect;
const deferedFetch = () => {
let promise = action.endpoint(...action.args);
const resolvePromise = promise => promise.then(data => {
resolve(data);
return data;
}).catch(error => {
reject(error);
throw error;
});
// schedule non-throttled resolutions in a microtask before set
// this enables users awaiting their fetch to trigger any react updates needed to deal
// with upcoming changes because of the fetch (for instance avoiding suspense if something is deleted)
if (!throttle) {
promise = resolvePromise(promise);
}
promise = promise.then(response => {
let lastReset = this.getLastReset();
/* istanbul ignore else */
if (process.env.NODE_ENV !== 'production' && isNaN(lastReset)) {
console.error('state.lastReset is NaN. Only positive timestamps are valid.');
lastReset = 0;
}
// don't update state with promises started before last clear
if (fetchedAt >= lastReset) {
this.controller.resolve(action.endpoint, {
args: action.args,
response,
fetchedAt
});
}
return response;
}).catch(error => {
const lastReset = this.getLastReset();
// don't update state with promises started before last clear
if (fetchedAt >= lastReset) {
this.controller.resolve(action.endpoint, {
args: action.args,
response: error,
fetchedAt,
error: true
});
}
throw error;
});
return promise;
};
if (throttle) {
return this.throttle(action.key, deferedFetch, fetchedAt).then(data => resolve(data)).catch(error => reject(error));
} else {
return deferedFetch().catch(() => {});
}
}
/** Called when middleware intercepts a set action.
*
* Will resolve the promise associated with set key.
*/
handleSet(action) {
// this can still turn out to be untrue since this is async
if (action.key in this.fetched) {
let promiseHandler;
if (action.error) {
promiseHandler = this.rejectors[action.key];
} else {
promiseHandler = this.resolvers[action.key];
}
promiseHandler(action.response);
// since we're resolved we no longer need to keep track of this promise
this.clear(action.key);
}
}
/** Ensures only one request for a given key is in flight at any time
*
* Uses key to either retrieve in-flight promise, or if not
* create a new promise and call fetch.
*
* Note: The new promise is not actually tied to fetch at all,
* but is resolved when the expected 'recieve' action is processed.
* This ensures promises are resolved only once their data is processed
* by the reducer.
*/
throttle(key, fetch, fetchedAt) {
const lastReset = this.getLastReset();
// we're already fetching so reuse the promise
// fetches after reset do not count
if (key in this.fetched && this.fetchedAt[key] > lastReset) {
return this.fetched[key];
}
this.fetched[key] = new Promise((resolve, reject) => {
this.resolvers[key] = resolve;
this.rejectors[key] = reject;
});
this.fetchedAt[key] = fetchedAt;
this.idleCallback(() => {
// since our real promise is resolved via the wrapReducer(),
// we should just stop all errors here.
// TODO: decouple this from useFetcher() (that's what's dispatching the error the resolves in here)
fetch().catch(() => null);
}, {
timeout: 500
});
return this.fetched[key];
}
/** Calls the callback when client is not 'busy' with high priority interaction tasks
*
* Override for platform-specific implementations
*/
idleCallback(callback, options) {
callback();
}
}
//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"names":["SET_RESPONSE","FETCH","RESET","createSetResponse","Controller","ResetError","Error","constructor","name","NetworkManager","dataExpiryLength","errorExpiryLength","fetched","Object","create","resolvers","rejectors","fetchedAt","controller","middleware","next","action","type","handleFetch","endpoint","getOptimisticResponse","undefined","sideEffect","Promise","resolve","then","key","_controller$getState$","error","getState","meta","handleSet","args","response","clearAll","k","init","cleanupDate","cleanup","Date","now","skipLogging","allSettled","fetches","values","length","clear","catch","getLastReset","lastReset","reject","throttle","deferedFetch","promise","resolvePromise","data","process","env","NODE_ENV","isNaN","console","promiseHandler","fetch","idleCallback","timeout","callback","options"],"sources":["../../src/manager/NetworkManager.ts"],"sourcesContent":["import { SET_RESPONSE, FETCH, RESET } from '../actionTypes.js';\nimport { createSetResponse } from '../controller/actions/index.js';\nimport Controller from '../controller/Controller.js';\nimport type {\n  FetchAction,\n  Manager,\n  ActionTypes,\n  MiddlewareAPI,\n  Middleware,\n  SetResponseAction,\n} from '../types.js';\n\nexport class ResetError extends Error {\n  name = 'ResetError';\n\n  constructor() {\n    super('Aborted due to RESET');\n  }\n}\n\n/** Handles all async network dispatches\n *\n * Dedupes concurrent requests by keeping track of all fetches in flight\n * and returning existing promises for requests already in flight.\n *\n * Interfaces with store via a redux-compatible middleware.\n *\n * @see https://dataclient.io/docs/api/NetworkManager\n */\nexport default class NetworkManager implements Manager {\n  protected fetched: { [k: string]: Promise<any> } = Object.create(null);\n  protected resolvers: { [k: string]: (value?: any) => void } = {};\n  protected rejectors: { [k: string]: (value?: any) => void } = {};\n  protected fetchedAt: { [k: string]: number } = {};\n  declare readonly dataExpiryLength: number;\n  declare readonly errorExpiryLength: number;\n  protected controller: Controller = new Controller();\n  declare cleanupDate?: number;\n\n  constructor({ dataExpiryLength = 60000, errorExpiryLength = 1000 } = {}) {\n    this.dataExpiryLength = dataExpiryLength;\n    this.errorExpiryLength = errorExpiryLength;\n  }\n\n  middleware: Middleware = controller => {\n    this.controller = controller;\n    return next => action => {\n      switch (action.type) {\n        case FETCH:\n          this.handleFetch(action);\n          // This is the only case that causes any state change\n          // It's important to intercept other fetches as we don't want to trigger reducers during\n          // render - so we need to stop 'readonly' fetches which can be triggered in render\n          if (\n            action.endpoint.getOptimisticResponse !== undefined &&\n            action.endpoint.sideEffect\n          ) {\n            return next(action);\n          }\n          return Promise.resolve();\n        case SET_RESPONSE:\n          // only set after new state is computed\n          return next(action).then(() => {\n            if (action.key in this.fetched) {\n              // Note: meta *must* be set by reducer so this should be safe\n              const error = controller.getState().meta[action.key]?.error;\n              // processing errors result in state meta having error, so we should reject the promise\n              if (error) {\n                this.handleSet(\n                  createSetResponse(action.endpoint, {\n                    args: action.args,\n                    response: error,\n                    fetchedAt: action.meta.fetchedAt,\n                    error: true,\n                  }),\n                );\n              } else {\n                this.handleSet(action);\n              }\n            }\n          });\n        case RESET: {\n          const rejectors = { ...this.rejectors };\n\n          this.clearAll();\n          return next(action).then(() => {\n            // there could be external listeners to the promise\n            // this must happen after commit so our own rejector knows not to dispatch an error based on this\n            for (const k in rejectors) {\n              rejectors[k](new ResetError());\n            }\n          });\n        }\n        default:\n          return next(action);\n      }\n    };\n  };\n\n  /** On mount */\n  init() {\n    delete this.cleanupDate;\n  }\n\n  /** Ensures all promises are completed by rejecting remaining. */\n  cleanup() {\n    // ensure no dispatches after unmount\n    // this must be reversible (done in init) so useEffect() remains symmetric\n    this.cleanupDate = Date.now();\n  }\n\n  /** Used by DevtoolsManager to determine whether to log an action */\n  skipLogging(action: ActionTypes) {\n    /* istanbul ignore next */\n    return action.type === FETCH && action.key in this.fetched;\n  }\n\n  allSettled() {\n    const fetches = Object.values(this.fetched);\n    if (fetches.length) return Promise.allSettled(fetches);\n  }\n\n  /** Clear all promise state */\n  protected clearAll() {\n    for (const k in this.rejectors) {\n      this.clear(k);\n    }\n  }\n\n  /** Clear promise state for a given key */\n  protected clear(key: string) {\n    this.fetched[key].catch(() => {});\n    delete this.resolvers[key];\n    delete this.rejectors[key];\n    delete this.fetched[key];\n    delete this.fetchedAt[key];\n  }\n\n  protected getLastReset() {\n    if (this.cleanupDate) return this.cleanupDate;\n    return this.controller.getState().lastReset;\n  }\n\n  /** Called when middleware intercepts 'rdc/fetch' action.\n   *\n   * Will then start a promise for a key and potentially start the network\n   * fetch.\n   *\n   * Uses throttle endpoints without sideEffects. This is valuable\n   * for ensures mutation requests always go through.\n   */\n  protected handleFetch(action: FetchAction) {\n    const { resolve, reject, fetchedAt } = action.meta;\n    const throttle = !action.endpoint.sideEffect;\n\n    const deferedFetch = () => {\n      let promise = action.endpoint(...action.args);\n      const resolvePromise = (\n        promise: Promise<string | number | object | null>,\n      ) =>\n        promise\n          .then(data => {\n            resolve(data);\n            return data;\n          })\n          .catch(error => {\n            reject(error);\n            throw error;\n          });\n      // schedule non-throttled resolutions in a microtask before set\n      // this enables users awaiting their fetch to trigger any react updates needed to deal\n      // with upcoming changes because of the fetch (for instance avoiding suspense if something is deleted)\n      if (!throttle) {\n        promise = resolvePromise(promise);\n      }\n      promise = promise\n        .then(response => {\n          let lastReset = this.getLastReset();\n\n          /* istanbul ignore else */\n          if (process.env.NODE_ENV !== 'production' && isNaN(lastReset)) {\n            console.error(\n              'state.lastReset is NaN. Only positive timestamps are valid.',\n            );\n            lastReset = 0;\n          }\n\n          // don't update state with promises started before last clear\n          if (fetchedAt >= lastReset) {\n            this.controller.resolve(action.endpoint, {\n              args: action.args,\n              response,\n              fetchedAt,\n            });\n          }\n          return response;\n        })\n        .catch(error => {\n          const lastReset = this.getLastReset();\n          // don't update state with promises started before last clear\n          if (fetchedAt >= lastReset) {\n            this.controller.resolve(action.endpoint, {\n              args: action.args,\n              response: error,\n              fetchedAt,\n              error: true,\n            });\n          }\n          throw error;\n        });\n      return promise;\n    };\n\n    if (throttle) {\n      return this.throttle(action.key, deferedFetch, fetchedAt)\n        .then(data => resolve(data))\n        .catch(error => reject(error));\n    } else {\n      return deferedFetch().catch(() => {});\n    }\n  }\n\n  /** Called when middleware intercepts a set action.\n   *\n   * Will resolve the promise associated with set key.\n   */\n  protected handleSet(action: SetResponseAction) {\n    // this can still turn out to be untrue since this is async\n    if (action.key in this.fetched) {\n      let promiseHandler: (value?: any) => void;\n      if (action.error) {\n        promiseHandler = this.rejectors[action.key];\n      } else {\n        promiseHandler = this.resolvers[action.key];\n      }\n      promiseHandler(action.response);\n      // since we're resolved we no longer need to keep track of this promise\n      this.clear(action.key);\n    }\n  }\n\n  /** Ensures only one request for a given key is in flight at any time\n   *\n   * Uses key to either retrieve in-flight promise, or if not\n   * create a new promise and call fetch.\n   *\n   * Note: The new promise is not actually tied to fetch at all,\n   * but is resolved when the expected 'recieve' action is processed.\n   * This ensures promises are resolved only once their data is processed\n   * by the reducer.\n   */\n  protected throttle(\n    key: string,\n    fetch: () => Promise<any>,\n    fetchedAt: number,\n  ) {\n    const lastReset = this.getLastReset();\n    // we're already fetching so reuse the promise\n    // fetches after reset do not count\n    if (key in this.fetched && this.fetchedAt[key] > lastReset) {\n      return this.fetched[key];\n    }\n\n    this.fetched[key] = new Promise((resolve, reject) => {\n      this.resolvers[key] = resolve;\n      this.rejectors[key] = reject;\n    });\n    this.fetchedAt[key] = fetchedAt;\n\n    this.idleCallback(\n      () => {\n        // since our real promise is resolved via the wrapReducer(),\n        // we should just stop all errors here.\n        // TODO: decouple this from useFetcher() (that's what's dispatching the error the resolves in here)\n        fetch().catch(() => null);\n      },\n      { timeout: 500 },\n    );\n\n    return this.fetched[key];\n  }\n\n  /** Calls the callback when client is not 'busy' with high priority interaction tasks\n   *\n   * Override for platform-specific implementations\n   */\n  protected idleCallback(\n    callback: (...args: any[]) => void,\n    options?: IdleRequestOptions,\n  ) {\n    callback();\n  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