forked from Baguette/dodb.cr
68 lines
1.4 KiB
Crystal
68 lines
1.4 KiB
Crystal
require "file_utils"
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require "json"
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class FSDB::Tags(V) < FSDB::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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def initialize(@storage_root, @name, @key_proc)
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::Dir.mkdir_p get_tag_directory
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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 |index|
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symlink = get_tagged_entry_path(key.to_s, index)
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Dir.mkdir_p ::File.dirname symlink
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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 |index_key|
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symlink = get_tagged_entry_path(key, index_key)
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::File.delete symlink
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end
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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 get(key) : Array(V)
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r_value = Array(V).new
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partition_directory = "#{get_tag_directory}/#{key}"
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return r_value unless Dir.exists? partition_directory
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Dir.each_child partition_directory do |child|
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r_value << V.from_json ::File.read "#{partition_directory}/#{child}"
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end
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r_value
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end
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private def get_tag_directory
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"#{@storage_root}/by_tags/by_#{@name}"
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end
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private def get_tagged_entry_path(key : String, index_key : String)
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"#{get_tag_directory}/#{index_key}/#{key}.json"
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end
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private def get_data_symlink(key)
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"../../../data/#{key}.json"
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end
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end
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