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resolves #1507 introduce an in-memory cache (Node.js)
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35 changes: 35 additions & 0 deletions
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packages/core/lib/asciidoctor/js/asciidoctor_ext/node/helpers.rb
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| module Asciidoctor | ||
| # Internal: Except where noted, a module that contains internal helper functions. | ||
| module Helpers | ||
| module_function | ||
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| # preserve the original require_library method | ||
| alias original_require_library require_library | ||
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| # Public: Require the specified library using Kernel#require. | ||
| # | ||
| # Attempts to load the library specified in the first argument using the | ||
| # Kernel#require. Rescues the LoadError if the library is not available and | ||
| # passes a message to Kernel#raise if on_failure is :abort or Kernel#warn if | ||
| # on_failure is :warn to communicate to the user that processing is being | ||
| # aborted or functionality is disabled, respectively. If a gem_name is | ||
| # specified, the message communicates that a required gem is not available. | ||
| # | ||
| # name - the String name of the library to require. | ||
| # gem_name - a Boolean that indicates whether this library is provided by a RubyGem, | ||
| # or the String name of the RubyGem if it differs from the library name | ||
| # (default: true) | ||
| # on_failure - a Symbol that indicates how to handle a load failure (:abort, :warn, :ignore) (default: :abort) | ||
| # | ||
| # Returns The [Boolean] return value of Kernel#require if the library can be loaded. | ||
| # Otherwise, if on_failure is :abort, Kernel#raise is called with an appropriate message. | ||
| # Otherwise, if on_failure is :warn, Kernel#warn is called with an appropriate message and nil returned. | ||
| # Otherwise, nil is returned. | ||
| def require_library name, gem_name = true, on_failure = :abort | ||
| if name == 'open-uri/cached' | ||
| `return Opal.Asciidoctor.Cache.enable()` | ||
| end | ||
| original_require_library name, gem_name, on_failure | ||
| end | ||
| end | ||
| end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,156 @@ | ||
| # copied from https://github.com/tigris/open-uri-cached/blob/master/lib/open-uri/cached.rb | ||
| module OpenURI | ||
| class << self | ||
| # preserve the original open_uri method | ||
| alias original_open_uri open_uri | ||
| def cache_open_uri(uri, *rest, &block) | ||
| response = Cache.get(uri.to_s) || | ||
| Cache.set(uri.to_s, original_open_uri(uri, *rest)) | ||
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| if block_given? | ||
| begin | ||
| yield response | ||
| ensure | ||
| response.close | ||
| end | ||
| else | ||
| response | ||
| end | ||
| end | ||
| # replace the existing open_uri method | ||
| alias open_uri cache_open_uri | ||
| end | ||
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| class Cache | ||
| class << self | ||
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| %x{ | ||
| // largely inspired by https://github.com/isaacs/node-lru-cache/blob/master/index.js | ||
| let cache = new Map() | ||
| let max = 16000000 // bytes | ||
| let length = 0 | ||
| let lruList = [] | ||
| class Entry { | ||
| constructor (key, value, length) { | ||
| this.key = key | ||
| this.value = value | ||
| this.length = length | ||
| } | ||
| } | ||
| const trim = () => { | ||
| while (length > max) { | ||
| pop() | ||
| } | ||
| } | ||
| const reset = () => { | ||
| cache = new Map() | ||
| length = 0 | ||
| lruList = [] | ||
| } | ||
| const pop = () => { | ||
| const leastRecentEntry = lruList.pop() | ||
| if (leastRecentEntry) { | ||
| length -= leastRecentEntry.length | ||
| cache.delete(leastRecentEntry.key) | ||
| } | ||
| } | ||
| const del = (entry) => { | ||
| if (entry) { | ||
| length -= entry.length | ||
| cache.delete(entry.key) | ||
| const entryIndex = lruList.indexOf(entry) | ||
| if (entryIndex > -1) { | ||
| lruList.splice(entryIndex, 1) | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| ## | ||
| # Retrieve file content and meta data from cache | ||
| # @param [String] key | ||
| # @return [StringIO] | ||
| def get(key) | ||
| %x{ | ||
| const cacheKey = crypto.createHash('sha256').update(key).digest('hex') | ||
| if (cache.has(cacheKey)) { | ||
| const entry = cache.get(cacheKey) | ||
| const io = Opal.$$$('::', 'StringIO').$new() | ||
| io['$<<'](entry.value) | ||
| io.$rewind() | ||
| return io | ||
| } | ||
| } | ||
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| nil | ||
| end | ||
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| # Cache file content | ||
| # @param [String] key | ||
| # URL of content to be cached | ||
| # @param [StringIO] value | ||
| # value to be cached, typically StringIO returned from `original_open_uri` | ||
| # @return [StringIO] | ||
| # Returns value | ||
| def set(key, value) | ||
| %x{ | ||
| const cacheKey = crypto.createHash('sha256').update(key).digest('hex') | ||
| const contents = value.string | ||
| const len = contents.length | ||
| if (cache.has(cacheKey)) { | ||
| if (len > max) { | ||
| // oversized object, dispose the current entry. | ||
| del(cache.get(cacheKey)) | ||
| return value | ||
| } | ||
| // update current entry | ||
| const entry = cache.get(cacheKey) | ||
| // remove existing entry in the LRU list (unless the entry is already the head). | ||
| const listIndex = lruList.indexOf(entry) | ||
| if (listIndex > 0) { | ||
| lruList.splice(listIndex, 1) | ||
| lruList.unshift(entry) | ||
| } | ||
| entry.value = value | ||
| length += len - entry.length | ||
| entry.length = len | ||
| trim() | ||
| return value | ||
| } | ||
| const entry = new Entry(cacheKey, value, len) | ||
| // oversized objects fall out of cache automatically. | ||
| if (entry.length > max) { | ||
| return value | ||
| } | ||
| length += entry.length | ||
| lruList.unshift(entry) | ||
| cache.set(cacheKey, entry) | ||
| trim() | ||
| return value | ||
| } | ||
| end | ||
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| def max=(maxLength) | ||
| %x{ | ||
| if (typeof maxLength !== 'number' || maxLength < 0) { | ||
| throw new TypeError('max must be a non-negative number') | ||
| } | ||
| max = maxLength || Infinity | ||
| trim() | ||
| } | ||
| end | ||
|
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| def reset | ||
| `reset()` | ||
| end | ||
| end | ||
| end | ||
| end |
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