117 lines
2.5 KiB
Crystal
117 lines
2.5 KiB
Crystal
require "file_utils"
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require "json"
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class DODB::Tags(V) < DODB::Indexer(V)
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property name : String
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property key_proc : Proc(V, Array(String))
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getter storage_root : String
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# Required to remove an entry in the DB.
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@storage : DODB::Storage(V)
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def initialize(@storage, @storage_root, @name, @key_proc)
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::Dir.mkdir_p indexing_directory
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end
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def check!(key, value, old_value)
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return true # Tags don’t have collisions or overloads.
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end
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def index(key, value)
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indices = key_proc.call(value)
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indices.each do |i|
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symlink = get_tagged_entry_path(i, key)
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Dir.mkdir_p ::File.dirname symlink
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# FIXME: Should not happen anymore. Should we remove this?
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::File.delete symlink if ::File.exists? symlink
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::File.symlink get_data_symlink(key), symlink
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end
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end
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def deindex(key, value)
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indices = key_proc.call(value)
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indices.each do |i|
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symlink = get_tagged_entry_path(i, key)
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::File.delete symlink
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end
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end
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def get_with_indice(tag : String) : Array(Tuple(V, Int32))
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r_value = Array(Tuple(V, Int32)).new
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tag_directory = indexing_directory tag
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return r_value unless Dir.exists? tag_directory
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Dir.each_child tag_directory do |child|
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r_value << {
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V.from_json(::File.read("#{tag_directory}/#{child}")),
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File.basename(child).gsub(/\.json$/, "").to_i
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}
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end
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r_value
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end
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def get_with_indices(keys : Array(String)) : Array(Tuple(V, Int32))
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r_value = Array(Tuple(V, Int32)).new
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keys.each do |tag|
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r_value.concat get_with_indice tag
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end
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r_value
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end
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def get(tag : String) : Array(V)
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get_with_indice(tag).map &.[0]
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end
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def get(keys : Array(String)) : Array(V)
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get_with_indices(keys.sort).map &.[0]
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end
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def delete(tag)
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delete tag, do true end
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end
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def delete(tag, &matcher)
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tag_directory = indexing_directory tag
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return unless Dir.exists? tag_directory
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Dir.each_child tag_directory do |child|
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path = "#{tag_directory}/#{child}"
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item = V.from_json ::File.read path
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if yield item
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key = get_key path
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@storage.delete key
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end
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end
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end
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private def get_key(path : String) : Int32
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::File.readlink(path)
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.sub(/\.json$/, "")
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.sub(/^.*\//, "")
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.to_i
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end
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def indexing_directory : String
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"#{@storage_root}/tags/by_#{@name}"
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end
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private def indexing_directory(tag)
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"#{indexing_directory}/#{tag}"
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end
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private def get_tagged_entry_path(tag : String, key : String)
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"#{indexing_directory}/#{tag}/#{key}.json"
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end
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private def get_data_symlink(key : String)
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"../../../data/#{key}.json"
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end
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end
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