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# Copyright (c) 2015 Lamont Granquist
# Copyright (c) 2015 Chef Software, Inc.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
require 'libyajl2'
# Mixin for use in finding the right yajl library on the system. The 'caller'
# needs to also mixin either the FFI module or the DLopen module. Those are
# deliberately not mixed in to avoid loading the dlopen module in the ffi
# codepath (which fails on jruby which does not have that C extension).
module FFI_Yajl
module MapLibraryName
private
# Stub for tests to override the host_os
#
# @api private
# @return Array<String> lower case ruby host_os string
def host_os
RbConfig::CONFIG['host_os'].downcase
end
# Array of yajl library names on the platform. Some platforms like Windows
# and Mac may have different names/extensions.
#
# @api private
# @return Array<String> Array of yajl library names for platform
def library_names
case host_os
when /mingw|mswin/
[ "libyajl.so", "yajl.dll" ]
when /cygwin/
[ "libyajl.so", "cygyajl.dll" ]
when /darwin/
[ "libyajl.bundle", "libyajl.dylib" ]
else
[ "libyajl.so" ]
end
end
# Array of yajl library names prepended with the libyajl2 path to use to
# load those directly and bypass the system libyajl by default. Since
# these are full paths, this API checks to ensure that the file exists on
# the filesystem. May return an empty array.
#
# @api private
# @return Array<String> Array of full paths to libyajl2 gem libraries
def expanded_library_names
library_names.map do |libname|
pathname = File.expand_path(File.join(Libyajl2.opt_path, libname))
pathname if File.file?(pathname)
end.compact
end
# Iterate across the expanded library names in the libyajl2-gem and then
# attempt to load the system libraries. Uses the native dlopen extension
# that ships in this gem.
#
# @api private
def dlopen_yajl_library
found = false
( expanded_library_names + library_names ).each do |libname|
begin
dlopen(libname)
found = true
break
rescue ArgumentError
end
end
raise "cannot find yajl library for platform" unless found
end
# Iterate across the expanded library names in the libyajl2-gem and attempt
# to load them. If they are missing just use `ffi_lib 'yajl'` to accept
# the FFI default algorithm to find the library.
#
# @api private
def ffi_open_yajl_library
found = false
expanded_library_names.each do |libname|
begin
ffi_lib libname
found = true
rescue LoadError
end
end
ffi_lib 'yajl' unless found
end
end
end
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