Baguette
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dodb.cr
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File split, grooming.

remotes/1702071717368387340/master
Luka Vandervelden 2019-12-11 18:10:09 +01:00
parent fc21b48870
commit 8ba15394b7
5 changed files with 216 additions and 201 deletions
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202
src/fsdb.cr
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@ -1,207 +1,7 @@
require "file_utils"
require "json"
abstract class FSDB::Indexer(V)
abstract def index (key : String, value : V)
abstract def deindex (key : String, value : V)
abstract def check! (key : String, value : V, old_value : V?)
abstract def name : String
end
class FSDB::Partition(V) < FSDB::Indexer(V)
property name : String
property key_proc : Proc(V, String)
getter storage_root : String
def initialize(@storage_root, @name, @key_proc)
::Dir.mkdir_p get_partition_directory
end
def check!(key, value, old_value)
return true # Partitions don’t have collisions or overloads.
end
def index(key, value)
partition = key_proc.call value
symlink = get_partition_symlink(partition, key)
Dir.mkdir_p ::File.dirname symlink
# FIXME: Should not happen anymore. Should we remove this?
::File.delete symlink if ::File.exists? symlink
::File.symlink get_data_symlink(key), symlink
end
def deindex(key, value)
partition = key_proc.call value
symlink = get_partition_symlink(partition, key)
::File.delete symlink
end
def get(partition)
r_value = Array(V).new
partition_directory = get_partition_directory partition
Dir.each_child partition_directory do |child|
r_value << V.from_json ::File.read "#{partition_directory}/#{child}"
end
r_value
end
private def get_partition_directory
"#{@storage_root}/partitions/by_#{@name}"
end
private def get_partition_directory(partition)
"#{get_partition_directory}/#{partition}"
end
private def get_partition_symlink(partition : String, key : String)
"#{get_partition_directory partition}/#{key}.json"
end
private def get_data_symlink(key : String)
"../../../data/#{key}.json"
end
end
class FSDB::Index(V) < FSDB::Indexer(V)
property name : String
property key_proc : Proc(V, String)
getter storage_root : String
def initialize(@storage_root, @name, @key_proc)
Dir.mkdir_p dir_path_indices
end
def check!(key, value, old_value)
index_key = key_proc.call value
symlink = file_path_index index_key.to_s
# FIXME: Check it’s not pointing to “old_value”, if any, before raising.
if ::File.exists? symlink
if old_value
old_key = key_proc.call old_value
return if symlink == file_path_index old_key.to_s
end
raise IndexOverload.new "Index '#{@name}' is overloaded for key '#{key}'"
end
end
def index(key, value)
index_key = key_proc.call value
symlink = file_path_index index_key
Dir.mkdir_p ::File.dirname symlink
# FIXME: Now that this is done in check!, can we remove it?
if ::File.exists? symlink
raise Exception.new "symlink already exists: #{symlink}"
end
::File.symlink get_data_symlink_index(key), symlink
end
def deindex(key, value)
index_key = key_proc.call value
symlink = file_path_index index_key
::File.delete symlink
end
def get(index : String) : V?
V.from_json ::File.read "#{file_path_index index}"
end
private def dir_path_indices
"#{@storage_root}/indices/by_#{@name}"
end
private def file_path_index(index_key : String)
"#{dir_path_indices}/#{index_key}.json"
end
private def get_data_symlink_index(key : String)
"../../data/#{key}.json"
end
end
class FSDB::Tags(V) < FSDB::Indexer(V)
property name : String
property key_proc : Proc(V, Array(String))
getter storage_root : String
def initialize(@storage_root, @name, @key_proc)
::Dir.mkdir_p get_tag_directory
end
def index(key, value)
indices = key_proc.call value
indices.each do |index|
symlink = get_tagged_entry_path(key.to_s, index)
Dir.mkdir_p ::File.dirname symlink
::File.delete symlink if ::File.exists? symlink
::File.symlink get_data_symlink(key), symlink
end
end
def deindex(key, value)
indices = key_proc.call value
indices.each do |index_key|
symlink = get_tagged_entry_path(key, index_key)
::File.delete symlink
end
end
def check!(key, value, old_value)
return true # Tags don’t have collisions or overloads.
end
def get(name, key) : Array(V)
r_value = Array(V).new
partition_directory = "#{get_tag_directory}/#{key}"
return r_value unless Dir.exists? partition_directory
Dir.each_child partition_directory do |child|
r_value << V.from_json ::File.read "#{partition_directory}/#{child}"
end
r_value
end
private def get_tag_directory
"#{@storage_root}/by_tags/by_#{@name}"
end
private def get_tagged_entry_path(key : String, index_key : String)
"#{get_tag_directory}/#{index_key}/#{key}.json"
end
private def get_data_symlink(key)
"../../../data/#{key}.json"
end
end
class FSDB::IndexOverload < Exception
end
require "./fsdb/*"
class FSDB::DataBase(K, V)
@indexers = [] of Indexer(V)

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src/fsdb/index.cr Normal file
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require "file_utils"
require "json"
require "./indexer.cr"
class FSDB::Index(V) < FSDB::Indexer(V)
property name : String
property key_proc : Proc(V, String)
getter storage_root : String
def initialize(@storage_root, @name, @key_proc)
Dir.mkdir_p dir_path_indices
end
def check!(key, value, old_value)
index_key = key_proc.call value
symlink = file_path_index index_key.to_s
# FIXME: Check it’s not pointing to “old_value”, if any, before raising.
if ::File.exists? symlink
if old_value
old_key = key_proc.call old_value
return if symlink == file_path_index old_key.to_s
end
raise IndexOverload.new "Index '#{@name}' is overloaded for key '#{key}'"
end
end
def index(key, value)
index_key = key_proc.call value
symlink = file_path_index index_key
Dir.mkdir_p ::File.dirname symlink
# FIXME: Now that this is done in check!, can we remove it?
if ::File.exists? symlink
raise Exception.new "symlink already exists: #{symlink}"
end
::File.symlink get_data_symlink_index(key), symlink
end
def deindex(key, value)
index_key = key_proc.call value
symlink = file_path_index index_key
::File.delete symlink
end
def get(index : String) : V?
V.from_json ::File.read "#{file_path_index index}"
end
private def dir_path_indices
"#{@storage_root}/indices/by_#{@name}"
end
private def file_path_index(index_key : String)
"#{dir_path_indices}/#{index_key}.json"
end
private def get_data_symlink_index(key : String)
"../../data/#{key}.json"
end
end
class FSDB::IndexOverload < Exception
end

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src/fsdb/indexer.cr Normal file
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abstract class FSDB::Indexer(V)
abstract def index (key : String, value : V)
abstract def deindex (key : String, value : V)
abstract def check! (key : String, value : V, old_value : V?)
abstract def name : String
end

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src/fsdb/partition.cr Normal file
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require "file_utils"
require "json"
require "./indexer.cr"
class FSDB::Partition(V) < FSDB::Indexer(V)
property name : String
property key_proc : Proc(V, String)
getter storage_root : String
def initialize(@storage_root, @name, @key_proc)
::Dir.mkdir_p get_partition_directory
end
def check!(key, value, old_value)
return true # Partitions don’t have collisions or overloads.
end
def index(key, value)
partition = key_proc.call value
symlink = get_partition_symlink(partition, key)
Dir.mkdir_p ::File.dirname symlink
# FIXME: Should not happen anymore. Should we remove this?
::File.delete symlink if ::File.exists? symlink
::File.symlink get_data_symlink(key), symlink
end
def deindex(key, value)
partition = key_proc.call value
symlink = get_partition_symlink(partition, key)
::File.delete symlink
end
def get(partition)
r_value = Array(V).new
partition_directory = get_partition_directory partition
Dir.each_child partition_directory do |child|
r_value << V.from_json ::File.read "#{partition_directory}/#{child}"
end
r_value
end
private def get_partition_directory
"#{@storage_root}/partitions/by_#{@name}"
end
private def get_partition_directory(partition)
"#{get_partition_directory}/#{partition}"
end
private def get_partition_symlink(partition : String, key : String)
"#{get_partition_directory partition}/#{key}.json"
end
private def get_data_symlink(key : String)
"../../../data/#{key}.json"
end
end

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src/fsdb/tags.cr Normal file
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require "file_utils"
require "json"
class FSDB::Tags(V) < FSDB::Indexer(V)
property name : String
property key_proc : Proc(V, Array(String))
getter storage_root : String
def initialize(@storage_root, @name, @key_proc)
::Dir.mkdir_p get_tag_directory
end
def index(key, value)
indices = key_proc.call value
indices.each do |index|
symlink = get_tagged_entry_path(key.to_s, index)
Dir.mkdir_p ::File.dirname symlink
::File.delete symlink if ::File.exists? symlink
::File.symlink get_data_symlink(key), symlink
end
end
def deindex(key, value)
indices = key_proc.call value
indices.each do |index_key|
symlink = get_tagged_entry_path(key, index_key)
::File.delete symlink
end
end
def check!(key, value, old_value)
return true # Tags don’t have collisions or overloads.
end
def get(name, key) : Array(V)
r_value = Array(V).new
partition_directory = "#{get_tag_directory}/#{key}"
return r_value unless Dir.exists? partition_directory
Dir.each_child partition_directory do |child|
r_value << V.from_json ::File.read "#{partition_directory}/#{child}"
end
r_value
end
private def get_tag_directory
"#{@storage_root}/by_tags/by_#{@name}"
end
private def get_tagged_entry_path(key : String, index_key : String)
"#{get_tag_directory}/#{index_key}/#{key}.json"
end
private def get_data_symlink(key)
"../../../data/#{key}.json"
end
end