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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 | 7x 7x 289x 7x 5x 7x 7x 35x 7x 7x 35x 11x 24x 7x 60x 47x 33x 31x 7x 7x 7x 7x 7x 7x 7x 60x 7x 7x 7x 7x 7x 7x 7x 23x 22x 1x 7x 11x 1x 10x 7x 7x 35x 35x 24x 9x 24x 35x 7x 35x 35x 21x 271x 31x 4x 236x 7x 39x 39x 39x 39x 2x 2x 39x 100x 25x 25x 39x 31x 31x 31x 31x 31x 19x 8x 12x 12x 2x 2x 2x 4x 4x 4x 4x 4x 8x 2x 1x 2x 2x 2x 2x 2x 39x 29x 25x 4x 39x 1x 38x 1x 37x 14x 29x 29x 29x 108x 29x 29x 25x 25x 29x 39x 1x 38x 1x 37x 35x 13x 13x 8x 5x 3x | // @flow import get from 'lodash/get' import isObject from 'lodash/isObject'IEEEE if (typeof (fetch) === 'undefined') { require('isomorphic-fetch') } // Generic fetch type const GFT = '__FETCH__' // ID that gets incremented for each fetch let FETCH_ID = 0 // Get's the next fetch ID, which can be passed in to `fetch`, and allows for // tracking the fetch or aborting it. export const getID = () => ++FETCH_ID // Active fetches, can still be aborted const activeFetches = { [GFT]: [] } // Remove a fetch from the active pool const removeFetch = (sig) => { if (sig.type === GFT) { activeFetches[GFT].splice(activeFetches[GFT].indexOf(sig.id), 1) } else { delete activeFetches[sig.type] } } // Check if a fetch is still active export const isActive = (sig) => { if (sig.type === GFT) return activeFetches[GFT].includes(sig.id) if (activeFetches[sig.type] === undefined) return false if (sig.id === undefined) return true return activeFetches[sig.type] === sig.id } // Action types export const ABORTED_FETCH = 'aborted fetch' export const ABORT_FETCH_FAILED = 'abort fetch failed' export const INCREMENT_FETCH = 'increment outstanding fetches' export const DECREMENT_FETCH = 'decrement outstanding fetches' export const FETCH = 'fetch' export const FETCH_MULTIPLE = 'fetch multiple' export const FETCH_ERROR = 'fetch error' // Simple action creator const createAction = (type) => (payload) => ({type, payload}) // Main actions to be dispatched export const fetchAction = createAction(FETCH) export const fetchMultiple = createAction(FETCH_MULTIPLE) export default fetchAction // Internally dispatched actions const abortedFetch = createAction(ABORTED_FETCH) const abortFetchFailed = createAction(ABORT_FETCH_FAILED) const fetchError = createAction(FETCH_ERROR) /** * Call decrement and dispatch "aborted" and "decrement" actions. If `id` is * not set, cancel all fetches for the given type. */ export const abortFetch = (sig) => { if (isActive(sig)) { return [ abortedFetch(sig), decrementFetches(sig) ] } else { return abortFetchFailed(sig) } } // Abort all active fetches export const abortAllFetches = () => Object.keys(activeFetches).reduce((aborts, fetchType) => { if (fetchType === GFT) { return [ ...aborts, ...activeFetches[GFT].map(id => abortFetch({type: GFT, id})) ] } else { return [ ...aborts, abortFetch({type: fetchType, id: activeFetches[fetchType]}) ] } }, []) /** * Send an increment action and add the fetch to the active list. This will also * abort a previous fetch of the same type if it exists. */ const incrementFetches = (payload) => { const actions = [{ type: INCREMENT_FETCH, payload }] if (payload.type === GFT) activeFetches[GFT].push(payload.id) else { if (activeFetches[payload.type] !== undefined) { actions.push(abortFetch({ type: payload.type, id: activeFetches[payload.type] })) } activeFetches[payload.type] = payload.id } return actions } /** * Send a decrement action and remove the fetch from the active list. */ const decrementFetches = (signature) => { removeFetch(signature) return { type: DECREMENT_FETCH, payload: signature } } // Redux middleware export const middleware = (store) => (next) => (action) => { switch (get(action, 'type')) { case FETCH: return store.dispatch(runFetchAction(action.payload, store.getState())) case FETCH_MULTIPLE: return store.dispatch(runFetchMultiple(action.payload, store.getState())) default: return next(action) } } /** * Calls fetch, adds Auth and Content header if needed. Automatically parses * content based on type. * * @returns Promise */ function runFetch ({ signature, options = {}, retry = false, url }, state) { const headers = { ...createAuthorizationHeader(state), ...createContentHeader(options.body), ...(options.headers || {}) } const filteredHeaders = {} // Allow removing generated headers by specifiying { header: null } in // options.headers. Do this in two steps because otherwise we're modifying // the object as we're iterating over it. Object.keys(headers) .filter(key => headers[key] !== null && headers[key] !== undefined) .forEach(key => { filteredHeaders[key] = headers[key] }) return fetch(url, { ...options, body: serialize(options.body), headers: filteredHeaders }) .then(checkStatus) .then(createResponse) .then(async (response) => (retry && isActive(signature) && await retry(response))E ? runFetch({signature, options, retry, url}, state) : response) } /** * Part of Redux action cycle. Returns an array of actions. */ function runFetchAction ({ type = GFT, id = getID(), next, options = {}, retry = false, url }, state) { // Fetch signature based on the `type` and `id` const signature = {type, id} // If next does not exist or only takes a response, dispatch on error const dispatchFetchError = !next || next.length < 2 // Wrap next so that we can parse the response const wrappedNext = wrapNext(next) return [ incrementFetches({type, id, options, url}), runFetch({signature, options, retry, url}, state) .then((response) => { if (isActive(signature)) { return [ decrementFetches(signature), wrappedNext(null, response) ] } }) .catch((error) => { return createErrorResponse(error) .then((response) => { if (isActive(signature)) { const actions = [ decrementFetches(signature), wrappedNext(error, response) ] if (dispatchFetchError) actions.push(fetchError(response)) return actions } }) }) ] } /** * @returns Array of actions */ function runFetchMultiple ({ type = GFT, id = getID(), // One ID for all fetch IDs in a fetch multiple fetches, next }, state) { const signature = {type, id} const dispatchFetchError = !next || next.length < 2 const wrappedNext = wrapNext(next) return [ incrementFetches({type, id, fetches}), Promise.all(fetches.map((fetch) => runFetch({...fetch, signature}, state))) .then((responses) => { if (isActive(signature)) { return [ decrementFetches(signature), wrappedNext(null, responses) ] } }) .catch((error) => createErrorResponse(error) .then((response) => { E if (isActive(signature)) { const actions = [ decrementFetches(signature), wrappedNext(error, response) ] if (dispatchFetchError) actions.push(fetchError(response)) return actions } })) ] } /** * TODO: Expose this function to allow for customization. */ function createAuthorizationHeader (state) { return state.user && state.user.idToken ? {Authorization: `bearer ${state.user.idToken}`} : {} } function checkStatus (res) { if (res.status >= 200 && res.status < 300) { return res } else { throw res } } function createContentHeader (body) { if (body instanceof window.FormData) { return {} } else if (isObject(body)) { return { 'Accept': 'application/json', 'Content-Type': 'application/json;charset=UTF-8' } } else { return {} } } function createErrorResponse (res) { return res.headers ? createResponse(res) : Promise.resolve(res) } function createResponse (res) { return deserialize(res) .then((value) => { res.value = value return res }) .catch((err) => { res.value = err return res }) } async function deserialize (res) { const header = `${res.headers.get('Content-Type')} ${res.headers.get('Content')}` if (header.indexOf('json') > -1) return res.json()E if (header.indexOf('octet-stream') > -1) return res.arrayBuffer() if (header.indexOf('text') > -1) return res.text() } function serialize (body) { if (body instanceof window.FormData) { return body } else if (isObject(body)) { return JSON.stringify(body) } else { return body } } function wrapNext (next) { return function (error, response) { Eif (next) { if (next.length > 1) { return next(error, response) } else if (!error) { return next(response) } } } } |