1 | {localStorage} = window
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2 |
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3 | class Cache
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4 | memoryCache: {}
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5 |
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6 | constructor: ({@$log, @localStoragePrefix}) ->
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7 |
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8 | getItem: (key, fallbackValue) ->
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9 | key = @_buildKey key
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10 |
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11 | item = @memoryCache[key]
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12 | item ?= localStorage.getItem key
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13 |
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14 | out = if item? then angular.fromJson(item) else fallbackValue
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15 | @$log.debug "CACHE GET: #{key}", out
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16 |
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17 | out
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18 |
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19 | setItem: (key, value) ->
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20 | key = @_buildKey key
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21 | stringValue = angular.toJson value
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22 |
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23 | try
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24 | localStorage.setItem(key, stringValue)
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25 | delete @memoryCache[key] if @memoryCache[key]?
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26 | catch e
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27 | @$log.error "Failed to write to localStorage.", {error: e, key, value: stringValue}
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28 | @memoryCache[key] = stringValue
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29 |
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30 | @$log.debug "CACHE PUT: #{key}", angular.fromJson angular.toJson value
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31 |
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32 | value
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33 |
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34 | clear: ({key, exceptFor, where} = {}) ->
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35 | return @$log.error "Using where and exceptFor arguments at once in clear() method is forbidden!" if where && exceptFor
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36 |
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37 | if exceptFor
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38 | exceptFor ?= []
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39 |
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40 | cacheKeys = []
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41 | for i in [0...localStorage.length]
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42 | cacheKey = localStorage.key i
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43 | continue unless @_cacheKeyHasPrefix(cacheKey, key)
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44 |
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45 | skipKey = no
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46 | for exception in exceptFor when @_cacheKeyHasPrefix(cacheKey, exception)
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47 | skipKey = yes
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48 | break
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49 |
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50 | continue if skipKey
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51 | cacheKeys.push cacheKey
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52 |
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53 | localStorage.removeItem(cacheKey) for cacheKey in cacheKeys
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54 | else
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55 | for cacheKey in where
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56 | localStorage.removeItem @_buildKey cacheKey
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57 |
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58 | _buildKey: (key) ->
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59 | "#{@localStoragePrefix}#{key}"
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60 |
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61 | _cacheKeyHasPrefix: (cacheKey, prefix) ->
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62 | return cacheKey.indexOf(@localStoragePrefix) is 0 unless prefix?
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63 | prefix = @_buildKey prefix
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64 | index = cacheKey.indexOf prefix
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65 | nextChar = cacheKey[prefix.length]
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66 | index is 0 and (not nextChar? or nextChar in ['?', '/'])
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67 |
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68 |
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69 | module.exports = (providerParams) ->
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70 | new Cache(providerParams)
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