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dodb.cr
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corruption prevention

master
Philippe PITTOLI 2019-07-24 02:19:57 +02:00
parent ac3f94c017
commit 594906bcc7
1 changed files with 9 additions and 2 deletions
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11
src/fs.cr
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@ -1,4 +1,5 @@
require "file_utils"
require "json"
class FS::Hash(K, V)
@ -51,9 +52,13 @@ class FS::Hash(K, V)
end
def []=(key : K, value : V)
# FIXME: Update partitions pointing to previous value (in any)
# FIXME: Update partitions pointing to previous value (if any)
::File.write file_path(key), value.to_json
# avoid corruption in case of crash during file writing
file_path(key).tap do |path|
::File.write "#{path}.new", value.to_json
::FileUtils.mv "#{path}.new", path
end
@partitions.each do |index|
index_key = index.key_proc.call value
@ -62,6 +67,8 @@ class FS::Hash(K, V)
Dir.mkdir_p ::File.dirname symlink
# FIXME: why?
# Hint: to update old symlinks (new data directory)
::File.delete symlink if ::File.exists? symlink
::File.symlink symlink_path(key), symlink