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# -*- encoding: utf-8 -*-
module Aliyun
module OSS
##
# Iterator structs that wrap the multiple communications with the
# server to provide an iterable result.
#
module Iterator
##
# Iterator base that stores fetched results and fetch more if needed.
#
class Base
def initialize(protocol, opts = {})
@protocol = protocol
@results, @more = [], opts
end
def next
loop do
# Communicate with the server to get more results
fetch_more if @results.empty?
# Return the first result
r = @results.shift
break unless r
yield r
end
end
def to_enum
self.enum_for(:next)
end
private
def fetch_more
return if @more[:truncated] == false
fetch(@more)
end
end # Base
##
# Buckets iterator
#
class Buckets < Base
def fetch(more)
@results, cont = @protocol.list_buckets(more)
@more[:marker] = cont[:next_marker]
@more[:truncated] = cont[:truncated] || false
end
end # Buckets
##
# Objects iterator
#
class Objects < Base
def initialize(protocol, bucket_name, opts = {})
super(protocol, opts)
@bucket = bucket_name
end
def fetch(more)
@results, cont = @protocol.list_objects(@bucket, more)
@results = cont[:common_prefixes] + @results if cont[:common_prefixes]
@more[:marker] = cont[:next_marker]
@more[:truncated] = cont[:truncated] || false
end
end # Objects
##
# Uploads iterator
#
class Uploads < Base
def initialize(protocol, bucket_name, opts = {})
super(protocol, opts)
@bucket = bucket_name
end
def fetch(more)
@results, cont = @protocol.list_multipart_uploads(@bucket, more)
@results = cont[:common_prefixes] + @results if cont[:common_prefixes]
@more[:id_marker] = cont[:next_id_marker]
@more[:key_marker] = cont[:next_key_marker]
@more[:truncated] = cont[:truncated] || false
end
end # Objects
end # Iterator
end # OSS
end # Aliyun
|
