discourse/lib/sass/discourse_stylesheets.rb

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require_dependency 'sass/discourse_sass_compiler'
require_dependency 'distributed_cache'
class DiscourseStylesheets
CACHE_PATH ||= 'tmp/stylesheet-cache'
MANIFEST_DIR ||= "#{Rails.root}/tmp/cache/assets/#{Rails.env}"
MANIFEST_FULL_PATH ||= "#{MANIFEST_DIR}/stylesheet-manifest"
@lock = Mutex.new
def self.cache
return {} if Rails.env.development?
@cache ||= DistributedCache.new("discourse_stylesheet")
end
def self.stylesheet_link_tag(target = :desktop)
tag = cache[target]
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return tag.dup.html_safe if tag
@lock.synchronize do
builder = self.new(target)
builder.compile unless File.exists?(builder.stylesheet_fullpath)
builder.ensure_digestless_file
tag = %[<link href="#{Rails.env.production? ? builder.stylesheet_cdnpath : builder.stylesheet_relpath_no_digest + '?body=1'}" media="all" rel="stylesheet" />]
cache[target] = tag
tag.dup.html_safe
end
end
def self.compile(target = :desktop, opts={})
@lock.synchronize do
FileUtils.rm(MANIFEST_FULL_PATH, force: true) if opts[:force] # Force a recompile, even in production env
builder = self.new(target)
builder.compile
builder.stylesheet_filename
end
end
def self.last_file_updated
if Rails.env.production?
@last_file_updated ||= if File.exists?(MANIFEST_FULL_PATH)
File.readlines(MANIFEST_FULL_PATH, 'r')[0]
else
mtime = max_file_mtime
FileUtils.mkdir_p(MANIFEST_DIR)
File.open(MANIFEST_FULL_PATH, "w") { |f| f.print(mtime) }
mtime
end
else
max_file_mtime
end
end
def self.max_file_mtime
globs = ["#{Rails.root}/app/assets/stylesheets/**/*.*css"]
for path in (Discourse.plugins || []).map { |plugin| File.dirname(plugin.path) }
globs += [
"#{path}/plugin.rb",
"#{path}/**/*.*css",
]
end
globs.map do |pattern|
Dir.glob(pattern).map { |x| File.mtime(x) }.max
end.compact.max.to_i
end
def initialize(target = :desktop)
@target = target
end
def compile
scss = File.read("#{Rails.root}/app/assets/stylesheets/#{@target}.scss")
css = begin
DiscourseSassCompiler.compile(scss, @target)
rescue Sass::SyntaxError => e
Rails.logger.error "Stylesheet failed to compile for '#{@target}'! Recompiling without plugins and theming."
Rails.logger.error e.sass_backtrace_str("#{@target} stylesheet")
DiscourseSassCompiler.compile(scss + DiscourseSassCompiler.error_as_css(e, "#{@target} stylesheet"), @target, safe: true)
end
FileUtils.mkdir_p(cache_fullpath)
File.open(stylesheet_fullpath, "w") do |f|
f.puts css
end
StylesheetCache.add(@target, digest, css)
css
end
def ensure_digestless_file
# file without digest is only for auto-reloading css in dev env
unless Rails.env.production? || (File.exist?(stylesheet_fullpath_no_digest) && File.mtime(stylesheet_fullpath) == File.mtime(stylesheet_fullpath_no_digest))
FileUtils.cp(stylesheet_fullpath, stylesheet_fullpath_no_digest)
end
end
def cache_fullpath
"#{Rails.root}/#{CACHE_PATH}"
end
def stylesheet_fullpath
"#{cache_fullpath}/#{stylesheet_filename}"
end
def stylesheet_fullpath_no_digest
"#{cache_fullpath}/#{stylesheet_filename_no_digest}"
end
def stylesheet_cdnpath
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"#{GlobalSetting.cdn_url}#{stylesheet_relpath}?__ws=#{Discourse.current_hostname}"
end
def root_path
"#{GlobalSetting.relative_url_root}/"
end
# using uploads cause we already have all the routing in place
def stylesheet_relpath
"#{root_path}stylesheets/#{stylesheet_filename}"
end
def stylesheet_relpath_no_digest
"#{root_path}stylesheets/#{stylesheet_filename_no_digest}"
end
def stylesheet_filename
"#{@target}_#{digest}.css"
end
def stylesheet_filename_no_digest
"#{@target}.css"
end
# digest encodes the things that trigger a recompile
def digest
@digest ||= begin
theme = (cs = ColorScheme.enabled) ? "#{cs.id}-#{cs.version}" : 0
category_updated = Category.last_updated_at
Digest::SHA1.hexdigest("#{RailsMultisite::ConnectionManagement.current_db}-#{theme}-#{DiscourseStylesheets.last_file_updated}-#{category_updated}")
end
end
end