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index.js
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index.js
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'use strict'
const assert = require('assert')
const axios = require('axios')
const version = require('./package.json').version
class Mida {
constructor(publicKey, options) {
options = options || {}
assert(publicKey, "You must pass your Mida project key")
this.publicKey = publicKey
this.host = 'https://api.mida.so'
this.user_id = null
this.enabled_features = []
this.maxCacheSize = options.maxCacheSize || 50000
this.featureFlagCache = new Map()
}
// A/B Testing methods
getExperiment(experimentKey, distinctId) {
assert(experimentKey, "You must pass your Mida experiment key")
assert(distinctId || this.user_id, "You must pass your user distinct ID")
return new Promise((resolve, reject) => {
const data = {
key: this.publicKey,
experiment_key: experimentKey,
distinct_id: distinctId || this.user_id
}
const headers = {}
if (typeof window === 'undefined') {
headers['user-agent'] = `mida-node/${version}`
}
const req = {
method: 'POST',
url: `${this.host}/experiment/query`,
data,
headers
}
axios(req)
.then(result => {
let json = result.data
if (json.version) resolve(json.version)
else resolve(null)
})
.catch((err) => {
if (err.response) {
const error = new Error(err.response.statusText)
reject(error)
}
})
})
}
setEvent(eventName, distinctId, properties = {}) {
assert(eventName, "You need to set an event name");
assert(distinctId || this.user_id, "You must pass your user distinct ID");
return new Promise((resolve, reject) => {
const data = {
key: this.publicKey,
name: eventName,
distinct_id: distinctId || this.user_id,
properties: JSON.stringify(properties)
};
const headers = {};
if (typeof window === 'undefined') {
headers['user-agent'] = `mida-node/${version}`;
}
const req = {
method: 'POST',
url: `${this.host}/experiment/event`,
data,
headers
};
axios(req)
.then(() => {
resolve();
})
.catch((err) => {
if (err.response) {
const error = new Error(err.response.statusText);
reject(error);
}
});
});
}
setAttribute(distinctId, properties = {}) {
assert(distinctId || this.user_id, "You must pass your user distinct ID")
assert(properties, "You must pass your user properties")
return new Promise((resolve, reject) => {
let data = properties
data.id = distinctId || this.user_id
const headers = {}
if (typeof window === 'undefined') {
headers['user-agent'] = `mida-node/${version}`
}
const req = {
method: 'POST',
url: `${this.host}/track/${this.publicKey}`,
data,
headers
}
axios(req)
.then(() => {
resolve()
})
.catch((err) => {
if (err.response) {
const error = new Error(err.response.statusText)
reject(error)
}
})
})
}
cachedFeatureFlag() {
const cacheKey = `${this.publicKey}:${this.user_id}`
const cachedFeatures = this.featureFlagCache.get(cacheKey)
if (cachedFeatures) return cachedFeatures
return []
}
isFeatureEnabled(key) {
return new Promise((resolve) => {
this.enabled_features = this.cachedFeatureFlag()
resolve(this.enabled_features.includes(key))
})
}
onFeatureFlags(distinctId = null) {
return new Promise(async (resolve, reject) => {
const cachedItems = this.cachedFeatureFlag().length
try {
await this.reloadFeatureFlags(distinctId)
if (!cachedItems) resolve()
} catch (e) {
reject(e)
}
if (cachedItems) resolve()
})
}
reloadFeatureFlags(distinctId = null) {
return new Promise((resolve, reject) => {
const data = {
key: this.publicKey,
user_id: distinctId
}
const headers = {}
if (typeof window === 'undefined') {
headers['user-agent'] = `mida-node/${version}`
}
const req = {
method: 'POST',
url: `${this.host}/feature-flag`,
data,
headers
}
axios(req)
.then(result => {
this.enabled_features = result.data
const cacheKey = `${this.publicKey}:${this.user_id}`
this.featureFlagCache.set(cacheKey, result.data)
if (this.featureFlagCache.size > this.maxCacheSize) {
const oldestKey = this.featureFlagCache.keys().next().value
this.featureFlagCache.delete(oldestKey)
}
resolve()
})
.catch((err) => {
if (err.response) {
const error = new Error(err.response.statusText)
reject(error)
}
})
})
}
}
module.exports = Mida