@ortoo/angular-resource
Version:
Magical CRUD resource management for angular
262 lines • 35.7 kB
JavaScript
// tslint:disable only-arrow-functions
import { EventEmitter } from './emitter';
import { uniq } from 'lodash';
import { isFunction } from 'lodash';
import { isString } from 'lodash';
import { isUndefined } from 'lodash';
import * as utils from './utils';
export function createServerResourceFactory(socket) {
function ServerResourceFactory(url, rootKey, rootKeyPlural) {
let sock = socket(url, rootKey, rootKeyPlural);
// Object holding the resources (keys are the object ids)
let _resources = {};
let _internalRes = {};
function toObject() {
return utils.toObject(this);
}
// Returns the object or a list of objects (depending on ids passed in)
// The array or object will have the $promise attribute to use.
function get(ids, force, transform) {
if (isFunction(force)) {
transform = force;
force = false;
}
if (!transform) {
transform = (val) => { return val; };
}
let singleId = false;
let results = [];
function transformResults() {
if (singleId) {
return results[0];
}
else {
return results;
}
}
// If we've been passed
if (isString(ids)) {
singleId = true;
ids = [ids];
}
// Make sure we have no repeated items in the array
ids = uniq(ids);
// Go and load in the results, compiling a list of resources we need to go and fetch
let unknownIds = [];
ids.forEach(function (id) {
let res = _resources[id];
if (res) {
results.push(transform(res, id));
// If we are forcing then we want to go and refetch assuming we've already resolved
// If we haven't resolved then we are going to refresh the data anyway so don't do
// anything here. If we aren't resolved and we aren't fetching then we want to
// go and refresh the data because we could have been created from somewhere that
// isn't the server
if ((force && res.$resolved) || !(res.$resolved || res.$fetching)) {
unknownIds.push(id);
res.$fetching = true;
// If we've already resolved then create a new promise object on the resource
if (res.$resolved) {
res.$deferred = new utils.Deferred();
res.$promise = this.$deferred.promise;
res.$resolved = false;
}
}
}
else {
// Haven't seen this id yet. Create a new resource and store it off
res = _resources[id] = (new ServerResource());
res.$fetching = true;
results.push(transform(res, id));
unknownIds.push(id);
}
});
// Do we have any ids to fetch. If so go and get them
if (unknownIds.length > 0) {
let req = sock.get(unknownIds);
req.then(function (response) {
// We might not get a response (say if the app is offline). In this case
// we just resolve everything as is.
if (isUndefined(response)) {
unknownIds.forEach(function (id) {
let res = _resources[id];
res.$fetching = false;
if (!res.$resolved) {
res.$resolved = true;
res.$deferred.resolve(res);
}
});
}
else {
response.forEach(function (resdata) {
if (resdata._id) {
let id = resdata._id;
let res = _resources[id];
res.$fetching = false;
updateVal(res, resdata);
// We've got the data for the first time - resolve the deferred
if (!res.$resolved) {
res.$deferred.resolve(res);
res.$resolved = true;
}
}
});
// If any of our unknown ids hasn't been resolved then we assume its deleted...
unknownIds.forEach(function (id) {
let res = _resources[id];
if (!res) {
return;
}
res.$fetching = false;
if (!res.$resolved) {
res.$deleted = true;
res.$emitter.emit('update', null, res.$toObject());
}
});
}
}, function (reason) {
// Handle an error...
// Clean up any of our unknown ids - we don't know about them
unknownIds.forEach(function (id) {
let res = _resources[id];
res.$fetching = false;
res.$deferred.reject(reason);
delete _resources[id];
});
});
}
if (!singleId) {
// Wait for all the promises to be resolved before resolving
let promises = [];
results.forEach(function (res) {
promises.push(res.$promise);
});
let tmpProm = Promise.all(promises);
results.$promise = tmpProm.then(function () {
// Return the results array as we resolve
return results;
});
}
return transformResults();
}
// Perform a save
function save(patch) {
utils.applyPatch(this, patch);
// We update if we have an _id - otherwise we create.
if (this._id) {
return updateResource(this, patch);
}
else {
// This is an initial create
return createResource(this);
}
}
function updateResource(res, patch) {
let req = sock.patch(res._id, patch);
return req.then(function (response) {
updateVal(res, response);
// Resolve the deferred
_resources[res._id] = res;
if (!res.$resolved) {
res.$deferred.resolve(res);
res.$resolved = true;
}
return res;
}).catch(function (reason) {
// Something went wrong - go and fetch the object again so we are up to date
if (res._id) {
res.$refresh();
}
throw reason;
});
}
function createResource(res) {
let data = res.$toObject();
let req = sock.create(data);
return req.then(function (response) {
// There could be a race condition here where we could end up creating the id map
// earlier (maybe...?)
updateVal(res, response);
_resources[res._id] = res;
if (!res.$resolved) {
res.$deferred.resolve(res);
res.$resolved = true;
}
});
}
function remove() {
let res = this;
res.$deleted = true;
let req = sock.remove(res._id);
return req.then(function (response) {
if (response) {
delete _resources[res._id];
}
else {
res.$deleted = false;
}
return response;
});
}
// Updates the value from the server
function updateVal(res, val) {
// Do we have a null value (indicating the resource has been deleted?)
if (val) {
// Convert any JSON dates into dates
val = utils.convertJsonDates(val);
let oldData = res.$toObject();
utils.removeResValues(res);
utils.setResValues(res, val);
// Make sure we have store this resource off
_resources[res._id] = res;
res.$emitter.emit('update', res.$toObject(), oldData);
}
else {
// Deleted - clean me up scotty
delete _resources[res._id];
res.$emitter.emit('update', null, res.$toObject());
}
}
function _updateVal(val) {
return updateVal(this, val);
}
function refresh() {
if (this._id) {
get(this._id, true);
}
}
// The main constructor for theServerResource class
function ServerResourceConstructor(val, id) {
let res = this;
this.$emitter = new EventEmitter();
this.$deferred = new utils.Deferred();
this.$promise = this.$deferred.promise; // An initial promise for our initial
// fetch or create of data
this.$resolved = false; // Have we had an initial resolution of the promise
this.$deleted = false; // Has the resource been deleted
this.$fetching = false; // Are we currently fetching data for this resource
this.$id = id ? id : utils.uuid();
_internalRes[this.$id] = this;
if (val) {
for (let key of Object.keys(val)) {
res[key] = val[key];
}
}
// If we have an id then add us to the store
if (this._id) {
_resources[this._id] = this;
}
}
const ServerResource = ServerResourceConstructor;
ServerResource.get = get;
ServerResource.prototype.$save = save;
ServerResource.prototype.$remove = remove;
ServerResource.prototype.$delete = remove;
ServerResource.prototype.$refresh = refresh;
ServerResource.prototype.$toObject = toObject;
ServerResource.prototype.$updateVal = _updateVal;
return ServerResource;
}
return ServerResourceFactory;
}
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tslint:disable only-arrow-functions\n\nimport { EventEmitter } from './emitter';\nimport { JSONPatch, ModelArray, ServerModel, ServerResource as IServerResource, SocketFactory } from './types';\n\nimport { uniq } from 'lodash';\nimport { isFunction } from 'lodash';\nimport { isString } from 'lodash';\nimport { isUndefined } from 'lodash';\n\nimport * as utils from './utils';\n\nexport function createServerResourceFactory(socket: SocketFactory) {\n\n  function ServerResourceFactory(url: string, rootKey: string, rootKeyPlural: string): IServerResource {\n    let sock = socket(url, rootKey, rootKeyPlural);\n\n    // Object holding the resources (keys are the object ids)\n    let _resources = {};\n    let _internalRes = {};\n\n    function toObject() {\n      return utils.toObject(this);\n    }\n\n    // Returns the object or a list of objects (depending on ids passed in)\n    // The array or object will have the $promise attribute to use.\n    function get(ids: (string[] | string), force?: boolean, transform?: Function) {\n\n      if (isFunction(force)) {\n        transform = force;\n        force = false;\n      }\n\n      if (!transform) {\n        transform = (val: any) => { return val; };\n      }\n\n      let singleId = false;\n      let results: ModelArray<ServerModel> = [];\n\n      function transformResults() {\n        if (singleId) {\n          return results[0];\n        } else {\n          return results;\n        }\n      }\n\n      // If we've been passed\n      if (isString(ids)) {\n        singleId = true;\n        ids = [ids];\n      }\n\n      // Make sure we have no repeated items in the array\n      ids = uniq(ids);\n\n      // Go and load in the results, compiling a list of resources we need to go and fetch\n      let unknownIds: string[] = [];\n      ids.forEach(function(id) {\n        let res: ServerModel = _resources[id];\n        if (res) {\n          results.push(transform(res, id));\n\n          // If we are forcing then we want to go and refetch assuming we've already resolved\n          // If we haven't resolved then we are going to refresh the data anyway so don't do\n          // anything here. If we aren't resolved and we aren't fetching then we want to\n          // go and refresh the data because we could have been created from somewhere that\n          // isn't the server\n          if ((force && res.$resolved) || !(res.$resolved || res.$fetching)) {\n            unknownIds.push(id);\n            res.$fetching = true;\n\n            // If we've already resolved then create a new promise object on the resource\n            if (res.$resolved) {\n              res.$deferred = new utils.Deferred<ServerModel>();\n              res.$promise = this.$deferred.promise;\n              res.$resolved = false;\n            }\n          }\n        } else {\n          // Haven't seen this id yet. Create a new resource and store it off\n          res = _resources[id] = <ServerModel> (new (<any> ServerResource)());\n          res.$fetching = true;\n          results.push(transform(res, id));\n          unknownIds.push(id);\n        }\n      });\n\n      // Do we have any ids to fetch. If so go and get them\n      if (unknownIds.length > 0) {\n        let req = sock.get(unknownIds);\n        req.then(function(response: any) {\n\n          // We might not get a response (say if the app is offline). In this case\n          // we just resolve everything as is.\n          if (isUndefined(response)) {\n            unknownIds.forEach(function(id) {\n              let res = _resources[id];\n              res.$fetching = false;\n\n              if (!res.$resolved) {\n                res.$resolved = true;\n                res.$deferred.resolve(res);\n              }\n            });\n          } else {\n            response.forEach(function(resdata: any) {\n              if (resdata._id) {\n                let id = resdata._id;\n                let res = _resources[id];\n                res.$fetching = false;\n                updateVal(res, resdata);\n\n                // We've got the data for the first time - resolve the deferred\n                if (!res.$resolved) {\n                  res.$deferred.resolve(res);\n                  res.$resolved = true;\n                }\n              }\n            });\n\n            // If any of our unknown ids hasn't been resolved then we assume its deleted...\n            unknownIds.forEach(function(id) {\n              let res = _resources[id];\n              if (!res) {\n                return;\n              }\n\n              res.$fetching = false;\n              if (!res.$resolved) {\n                res.$deleted = true;\n                res.$emitter.emit('update', null, res.$toObject());\n              }\n            });\n          }\n        }, function(reason: any) {\n          // Handle an error...\n          // Clean up any of our unknown ids - we don't know about them\n          unknownIds.forEach(function(id) {\n            let res = _resources[id];\n            res.$fetching = false;\n            res.$deferred.reject(reason);\n            delete _resources[id];\n          });\n        });\n      }\n\n      if (!singleId) {\n        // Wait for all the promises to be resolved before resolving\n        let promises: Array<Promise<any>> = [];\n        results.forEach(function(res) {\n          promises.push(res.$promise);\n        });\n\n        let tmpProm = Promise.all(promises);\n        results.$promise = tmpProm.then(function() {\n          // Return the results array as we resolve\n          return results;\n        });\n      }\n\n      return transformResults();\n    }\n\n    // Perform a save\n    function save(this: ServerModel, patch: JSONPatch) {\n      utils.applyPatch(this, patch);\n\n      // We update if we have an _id - otherwise we create.\n      if (this._id) {\n        return updateResource(this, patch);\n      } else {\n        // This is an initial create\n        return createResource(this);\n      }\n    }\n\n    function updateResource(res: any, patch: JSONPatch) {\n      let req = sock.patch(res._id, patch);\n      return req.then(function(response: any) {\n        updateVal(res, response);\n        // Resolve the deferred\n        _resources[res._id] = res;\n        if (!res.$resolved) {\n          res.$deferred.resolve(res);\n          res.$resolved = true;\n        }\n\n        return res;\n\n      }).catch(function(reason: any) {\n        // Something went wrong - go and fetch the object again so we are up to date\n        if (res._id) {\n          res.$refresh();\n        }\n\n        throw reason;\n      });\n    }\n\n    function createResource(res: any) {\n      let data = res.$toObject();\n\n      let req = sock.create(data);\n      return req.then(function(response) {\n        // There could be a race condition here where we could end up creating the id map\n        // earlier (maybe...?)\n        updateVal(res, response);\n        _resources[res._id] = res;\n\n        if (!res.$resolved) {\n          res.$deferred.resolve(res);\n          res.$resolved = true;\n        }\n      });\n    }\n\n    function remove() {\n\n      let res = this;\n      res.$deleted = true;\n\n      let req = sock.remove(res._id);\n      return req.then(function(response) {\n        if (response) {\n          delete _resources[res._id];\n        } else {\n          res.$deleted = false;\n        }\n\n        return response;\n      });\n    }\n\n    // Updates the value from the server\n    function updateVal(res: any, val: any) {\n\n      // Do we have a null value (indicating the resource has been deleted?)\n      if (val) {\n        // Convert any JSON dates into dates\n        val = utils.convertJsonDates(val);\n\n        let oldData = res.$toObject();\n        utils.removeResValues(res);\n        utils.setResValues(res, val);\n\n        // Make sure we have store this resource off\n        _resources[res._id] = res;\n        res.$emitter.emit('update', res.$toObject(), oldData);\n      } else {\n        // Deleted - clean me up scotty\n        delete _resources[res._id];\n        res.$emitter.emit('update', null, res.$toObject());\n      }\n    }\n\n    function _updateVal(this: ServerModel, val: any) {\n      return updateVal(this, val);\n    }\n\n    function refresh(this: ServerModel) {\n      if (this._id) {\n        get(this._id, true);\n      }\n    }\n\n    // The main constructor for theServerResource class\n    function ServerResourceConstructor(val?: any, id?: string): void {\n      let res = this;\n      this.$emitter = new EventEmitter();\n\n      this.$deferred = new utils.Deferred();\n      this.$promise = this.$deferred.promise; // An initial promise for our initial\n                                              // fetch or create of data\n      this.$resolved = false; // Have we had an initial resolution of the promise\n      this.$deleted = false; // Has the resource been deleted\n      this.$fetching = false; // Are we currently fetching data for this resource\n\n      this.$id = id ? id : utils.uuid();\n\n      _internalRes[this.$id] = this;\n\n      if (val) {\n        for (let key of Object.keys(val)) {\n          res[key] = val[key];\n        }\n      }\n\n      // If we have an id then add us to the store\n      if (this._id) {\n        _resources[this._id] = this;\n      }\n    }\n\n    const ServerResource: IServerResource = ServerResourceConstructor;\n    ServerResource.get = get;\n\n    ServerResource.prototype.$save = save;\n    ServerResource.prototype.$remove = remove;\n    ServerResource.prototype.$delete = remove;\n    ServerResource.prototype.$refresh = refresh;\n    ServerResource.prototype.$toObject = toObject;\n    ServerResource.prototype.$updateVal = _updateVal;\n\n    return ServerResource;\n  }\n\n  return ServerResourceFactory;\n}\n"]}