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Contents
# frozen_string_literal: true
module Shipit
class GitHubHTTPCacheMiddleware < Faraday::Middleware
def call(request_env)
@app.call(request_env).on_complete do |response_env|
if headers = response_env[:response_headers]
# We're removing max-age and s-maxage because some endpoints,
# especially /<repo>/commits, returns a max-age=0. This means that
# if two commits are pushed within 1 minute of each others, we won't
# see the second one. So instead we still issue the request, but we
# revalidate it.
cache_control = parse(headers['cache-control'].to_s)
cache_control.delete('max-age')
cache_control.delete('s-maxage')
cache_control['no-cache'] = true
cache_control['must-revalidate'] = true
headers['cache-control'] = dump(cache_control)
# We're removing `Authorization` from the `Vary` header because
# Faraday::HttpCache has a very limited garbage collection support
# and this cause cache entries to grow indefinitely.
# See https://github.com/Shopify/shipit-engine/issues/935 for
# more details.
vary = parse(headers['vary'].to_s)
vary.delete('authorization')
headers['vary'] = dump(vary)
end
end
end
private
def dump(directives)
directives.map do |k, v|
if v == true
k
else
"#{k}=#{v}"
end
end.join(', ')
end
def parse(header)
directives = {}
header.delete(' ').split(',').each do |part|
next if part.empty?
name, value = part.split('=', 2)
directives[name.downcase] = (value || true) unless name.empty?
end
directives
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems