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require 'rubygems/remote_fetcher'
require 'rubygems/user_interaction'
require 'rubygems/errors'
require 'rubygems/text'
##
# SpecFetcher handles metadata updates from remote gem repositories.
class Gem::SpecFetcher
include Gem::UserInteraction
include Gem::Text
FILES = {
:all => 'specs',
:latest => 'latest_specs',
:prerelease => 'prerelease_specs',
}
##
# The SpecFetcher cache dir.
attr_reader :dir # :nodoc:
##
# Cache of latest specs
attr_reader :latest_specs # :nodoc:
##
# Cache of all released specs
attr_reader :specs # :nodoc:
##
# Cache of prerelease specs
attr_reader :prerelease_specs # :nodoc:
@fetcher = nil
def self.fetcher
@fetcher ||= new
end
def self.fetcher=(fetcher) # :nodoc:
@fetcher = fetcher
end
def initialize
require 'fileutils'
@dir = File.join Gem.user_home, '.gem', 'specs'
@update_cache = File.stat(Gem.user_home).uid == Process.uid
@specs = {}
@latest_specs = {}
@prerelease_specs = {}
@caches = {
:latest => @latest_specs,
:prerelease => @prerelease_specs,
:all => @specs
}
@fetcher = Gem::RemoteFetcher.fetcher
end
##
# Returns the local directory to write +uri+ to.
def cache_dir(uri)
# Correct for windows paths
escaped_path = uri.path.sub(/^\/([a-z]):\//i, '/\\1-/')
File.join @dir, "#{uri.host}%#{uri.port}", File.dirname(escaped_path)
end
##
# Fetch specs matching +dependency+. If +all+ is true, all matching
# (released) versions are returned. If +matching_platform+ is
# false, all platforms are returned. If +prerelease+ is true,
# prerelease versions are included.
def fetch_with_errors(dependency,
all = false,
matching_platform = true,
prerelease = false)
specs_and_sources, errors = find_matching_with_errors(dependency,
all,
matching_platform,
prerelease)
ss = specs_and_sources.map do |spec_tuple, source_uri|
[fetch_spec(spec_tuple, URI.parse(source_uri)), source_uri]
end
return [ss, errors]
end
def fetch(*args)
fetch_with_errors(*args).first
end
def fetch_spec(spec, source_uri)
source_uri = URI.parse source_uri if String === source_uri
spec = spec - [nil, 'ruby', '']
spec_file_name = "#{spec.join '-'}.gemspec"
uri = source_uri + "#{Gem::MARSHAL_SPEC_DIR}#{spec_file_name}"
cache_dir = cache_dir uri
local_spec = File.join cache_dir, spec_file_name
if File.exist? local_spec then
spec = Gem.read_binary local_spec
else
uri.path << '.rz'
spec = @fetcher.fetch_path uri
spec = Gem.inflate spec
if @update_cache then
FileUtils.mkdir_p cache_dir
open local_spec, 'wb' do |io|
io.write spec
end
end
end
# TODO: Investigate setting Gem::Specification#loaded_from to a URI
Marshal.load spec
end
##
# Find spec names that match +dependency+. If +all+ is true, all
# matching released versions are returned. If +matching_platform+
# is false, gems for all platforms are returned.
def find_matching_with_errors(dependency,
all = false,
matching_platform = true,
prerelease = false)
found = {}
rejected_specs = {}
list(all, prerelease).each do |source_uri, specs|
found[source_uri] = specs.select do |spec_name, version, spec_platform|
if dependency.match?(spec_name, version)
if matching_platform and !Gem::Platform.match(spec_platform)
pm = (rejected_specs[dependency] ||= Gem::PlatformMismatch.new(spec_name, version))
pm.add_platform spec_platform
false
else
true
end
end
end
end
errors = rejected_specs.values
specs_and_sources = []
found.each do |source_uri, specs|
uri_str = source_uri.to_s
specs_and_sources.concat(specs.map { |spec| [spec, uri_str] })
end
[specs_and_sources, errors]
end
def find_matching(*args)
find_matching_with_errors(*args).first
end
##
# Suggests a gem based on the supplied +gem_name+. Returns a string
# of the gem name if an approximate match can be found or nil
# otherwise. NOTE: for performance reasons only gems which exactly
# match the first character of +gem_name+ are considered.
def suggest_gems_from_name gem_name
gem_name = gem_name.downcase
max = gem_name.size / 2
specs = list.values.flatten 1
matches = specs.map { |name, version, platform|
next unless Gem::Platform.match platform
distance = levenshtein_distance gem_name, name.downcase
next if distance >= max
return [name] if distance == 0
[name, distance]
}.compact
matches = matches.uniq.sort_by { |name, dist| dist }
matches.first(5).map { |name, dist| name }
end
##
# Returns a list of gems available for each source in Gem::sources. If
# +all+ is true, all released versions are returned instead of only latest
# versions. If +prerelease+ is true, include prerelease versions.
def list(all = false, prerelease = false)
# TODO: make type the only argument
type = if all
:all
elsif prerelease
:prerelease
else
:latest
end
list = {}
file = FILES[type]
cache = @caches[type]
Gem.sources.each do |source_uri|
source_uri = URI.parse source_uri
unless cache.include? source_uri
cache[source_uri] = load_specs source_uri, file
end
list[source_uri] = cache[source_uri]
end
if type == :all
list.values.map do |gems|
gems.reject! { |g| !g[1] || g[1].prerelease? }
end
end
list
end
##
# Loads specs in +file+, fetching from +source_uri+ if the on-disk cache is
# out of date.
def load_specs(source_uri, file)
file_name = "#{file}.#{Gem.marshal_version}"
spec_path = source_uri + "#{file_name}.gz"
cache_dir = cache_dir spec_path
local_file = File.join(cache_dir, file_name)
loaded = false
if File.exist? local_file then
begin
spec_dump =
@fetcher.fetch_path(spec_path, File.mtime(local_file))
rescue Gem::RemoteFetcher::FetchError => e
alert_warning "Error fetching data: #{e.message}"
end
loaded = true if spec_dump
spec_dump ||= Gem.read_binary local_file
else
spec_dump = @fetcher.fetch_path spec_path
loaded = true
end
specs = begin
Marshal.load spec_dump
rescue ArgumentError
spec_dump = @fetcher.fetch_path spec_path
loaded = true
Marshal.load spec_dump
end
if loaded and @update_cache then
begin
FileUtils.mkdir_p cache_dir
open local_file, 'wb' do |io|
io << spec_dump
end
rescue
end
end
specs
end
end