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* @module course
*/
const courseRepo = require("../../repositories/course");
const coursePhaseRepo = require("../../repositories/course/phase");
const log = require("../../util/log");
const filtering = require("../filtering");
const cache = require("../cache");
const _ = require('lodash');
/**
* Fetch similar course records by provided course and course-phase
* records. If the provided course has multiple phases, one is picked
* to avoid duplicate results.
* Returns an array of course records with a default maximum size of 5.
* @param {Object} course
* @param {Number} [maximum=5] default is 5
* @return {Array} similar course records
*/
const fetchSimilarCourseRecords = async (course, maximum) => {
let findRecords = [];
if (cache.has("courses")) {
const cachedVal = cache.get("courses");
log.info("Course %s: Fetching similar courses from CACHE", course.id);
const matching = [];
cachedVal.forEach(e => {
if (
(e.capabilityId === course.capabilityId) &&
(e.categoryId === course.categoryId) &&
(e.competencyId === course.competencyId) &&
(e.phases[0] === course.phases[0])
) {
matching.push(e);
}
});
findRecords = matching;
} else {
log.info("Course %s: Fetching similar courses from DB", course.id);
const findWithPhaseResult = await courseRepo.findByFilters({
capabilityId: course.capabilityId,
categoryId: course.categoryId,
competencyId: course.competencyId,
// if a course has multiple phases, one of them is picked for search
phaseId: course.phases[0],
});
findRecords = findWithPhaseResult.rows;
}
// TODO: fetch more
const filteredRecords = findRecords.filter(e => e.id !== course.id);
log.info("Course %s: Found %s similar course(s), returning %s",
course.id, filteredRecords.length,
((filteredRecords.length > 5) ? (maximum ? maximum : 5) : filteredRecords.length));
// return maximum 5 by default
return filteredRecords.slice(0, (maximum ? maximum : 5));
};
/**
* Fetches all info related to course and resolves
* all identifiers to values in the database.
* Returns resolved course object.
* @param {Number} courseId
* @return {Object} course
*/
const fetchAndResolveCourse = async (courseId) => {
log.info("Course %s: Fetching all info", courseId);
if (cache.has(`course-${courseId}`)) {
log.info("Course %s: Fetched all info from CACHE", courseId);
return cache.get(`course-${courseId}`);
} else {
throw new Error(`No course found by id '${courseId}'`);
}
};
/**
* Fetch courses based on input filters.
* Fetches from cache if possible
* @param {Object} filters
* @return {Array} matching course objects
*/
const fetchByFilters = async (filters) => {
if (cache.has("courses")) {
const cachedVal = cache.get("courses");
const matching = [];
const safeKey = _.escapeRegExp(filters.keyword);
const regex = RegExp(safeKey ? safeKey : '', 'i');
cachedVal.forEach(e => {
if (
(
!filters.capability ||
parseInt(filters.capability, 10) === -1 ||
e.capabilityId === parseInt(filters.capability, 10)
) &&
(
!filters.category ||
parseInt(filters.category, 10) === -1 ||
e.categoryId === parseInt(filters.category, 10)
) &&
(
!filters.competency ||
parseInt(filters.competency, 10) === -1 ||
e.competencyId === parseInt(filters.competency, 10)
) &&
(
!filters.phase ||
parseInt(filters.phase, 10) === -1 ||
e.phases.includes(parseInt(filters.phase, 10))
) &&
(
regex.test(e.title)
)
) {
matching.push(e);
}
});
log.info("Fetched %s courses with %s filters from CACHE", matching.length, JSON.stringify(filters));
return matching;
} else {
const findResult = await courseRepo.findByFiltersAndKeywordJoint({
filters: {
capabilityId: filters.capability ? parseInt(filters.capability, 10) : -1,
categoryId: filters.category ? parseInt(filters.category, 10) : -1,
competencyId: filters.competency ? parseInt(filters.competency, 10) : -1,
phaseId: filters.phase ? parseInt(filters.phase, 10) : -1,
},
keyword: filters.keyword ? filters.keyword : '',
});
log.info("Fetched %s courses with %s filters from DB", findResult.rows.length, JSON.stringify(filters));
return findResult.rows;
}
};
/**
* Fetch call courses.
* Fetches from cache if possible, otherwise
* fetches from database and caches values
* for future use.
*/
const fetchAll = async () => {
if (cache.has("courses")) {
return cache.get("courses");
} else {
const courses = await fetchByFilters({});
cache.set("courses", courses);
courses.forEach(e => {
cache.set(`course-${e.id}`, e);
});
return (courses);
}
};
/**
* Fetch all courses that have unique titles.
* Fetches all courses then filters and sorts
* by the titles.
* @return {Array} courses
*/
const fetchAllWithUniqueTitles = async () => {
const allCourses = await fetchAll();
return filtering.filterAndSortByTitle(allCourses);
};
/**
* Add a new course: insert new course object to the database,
* and immediately attempt to update the cache with the new object.
* The course object is only cached if it can successfully be updated
* from the LinkedIn Learning API.
* @param {Object} course
*/
const addNewCourse = async (course) => {
const insertionResult = await courseRepo.insert({
title: course.title,
hyperlink: course.hyperlink,
capabilityId: parseInt(course.capability, 10),
categoryId: parseInt(course.category, 10),
competencyId: parseInt(course.competency, 10),
urn: course.urn,
});
const courseId = insertionResult.rows[0].id;
if (Array.isArray(course.phases)) {
for await (const phase of course.phases) {
await coursePhaseRepo.insert({
courseId,
phaseId: parseInt(phase, 10),
});
}
} else {
await coursePhaseRepo.insert({
courseId,
phaseId: parseInt(course.phases, 10),
});
}
log.info("Course %d: Successfully inserted new record to database", courseId);
log.info("Course %d: Caching new course...", courseId);
const findResult = await courseRepo.findByIdWithFullInfo(courseId);
const temp = findResult.rows[0];
cache.set(`course-${courseId}`, temp);
await cache.updateFromAPI(`course-${courseId}`);
log.info("Course %d: Cache updated with new course.", courseId);
return courseId;
};
/**
* Update a course: update a stored course object in the database,
* and immediately attempt to update the cache with the object.
* The course object is only cached if it can successfully be updated
* from the LinkedIn Learning API.
* @param {Object} course
*/
const updateCourse = async (course) => {
const courseId = parseInt(course.id, 10);
await courseRepo.update({
title: course.title,
hyperlink: course.hyperlink,
capabilityId: parseInt(course.capability, 10),
categoryId: parseInt(course.category, 10),
competencyId: parseInt(course.competency, 10),
urn: course.urn,
id: courseId,
});
await coursePhaseRepo.removeByCourseId(courseId);
if (Array.isArray(course.phases)) {
for await (const phase of course.phases) {
await coursePhaseRepo.insert({
courseId,
phaseId: parseInt(phase, 10),
});
}
} else {
await coursePhaseRepo.insert({
courseId,
phaseId: parseInt(course.phases, 10),
});
}
log.info("Course %d: Successfully updated record in database", courseId);
log.info("Course %d: Caching updated course...", courseId);
const findResult = await courseRepo.findByIdWithFullInfo(courseId);
const temp = findResult.rows[0];
const coursesArray = cache.get("courses");
const index = coursesArray.findIndex((e) => {
return e.id === courseId;
});
coursesArray[index] = temp;
cache.set(`course-${courseId}`, temp);
cache.set("courses", coursesArray);
log.info("Course %d: Cache updated with updated course.", courseId);
};
/**
* Delete a course from the database and efficiently remove it
* from the cache so full flushing of cache can be avoided.
* @param {Number} id
*/
const deleteCourse = async (id) => {
log.info("Course %d: Deleting course with all details...", id);
await courseRepo.removeById(id);
await coursePhaseRepo.removeByCourseId(id);
log.info("Course %d: Deleting course from cache...", id);
cache.del(`course-${id}`);
const coursesArray = cache.get("courses");
const index = coursesArray.findIndex((e) => {
return e.id === parseInt(id, 10);
});
coursesArray.splice(index, 1);
cache.set("courses", coursesArray);
log.info("Course %d: Deleted course from cache...", id);
log.info("Course %d: Deleted course with all details...", id);
};
module.exports = {
fetchSimilarCourseRecords,
fetchAndResolveCourse,
fetchByFilters,
fetchAll,
fetchAllWithUniqueTitles,
addNewCourse,
updateCourse,
deleteCourse,
};
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