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TODO.md
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TODO.md
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@ -6,3 +6,4 @@
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- Check for TODOs
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- For indexes and partitions: check that the structure attribute exists.
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- Verify names of indexes and partitions: names are directly related to directory paths.
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- db/data-filepath instead of get-filepath.
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178
src/main.lisp
178
src/main.lisp
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@ -24,27 +24,18 @@
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(defun number->filename (number)
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(format nil "~15,'0D" number))
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; Example: "vehicle" "color" object -> (vehicle-color object) -> "Red"
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(defun get-object-attribute (struct-name attribute-name object)
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(funcall ; example: call function "VEHICLE-COLOR"
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(find-symbol (to-upper-case
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(concatenate 'string struct-name "-" attribute-name)))
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object))
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; index = 1-1
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; partition = 1-n
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(defstruct db
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struct-name ; String
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path ; Path
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(indexes ()) ; [String]
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(partitions ()) ; [String]
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(current-index 0) ; Int
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(data (make-hash-table)) ; {Int -> struct}
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)
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path ; Path
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(indexes (make-hash-table)) ; {String => #'FUNCTION-NAME}
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(partitions (make-hash-table)) ; {String => #'FUNCTION-NAME}
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(current-index 0) ; Int
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(data (make-hash-table))) ; {Int -> struct}
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; db/new ensures directory '<path>/data/' exist,
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; then loads values from existing files, if any, and puts them into db-data.
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(defun db/new (struct-name path)
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(defun db/new (path)
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(let ((data (make-hash-table))
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(data-dir-path (concatenate 'string path "/data/"))
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(current-index 0))
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@ -59,7 +50,6 @@
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(setf (gethash id data) value)))
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(make-db
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:struct-name struct-name
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:path path
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:data data
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:current-index current-index)))
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@ -72,56 +62,49 @@
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(concatenate 'string dbpath "/data/" (number->filename number)))
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; Example: returns "./storage/cars/indexes/by_name/".
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(defun db/index/get-directory-path (database object-attribute)
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(defun db/index/get-directory-path (dbpath object-attribute)
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(let ((name (typecase object-attribute
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(string object-attribute)
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(symbol (symbol-name object-attribute))
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(t (format nil "~A" object-attribute))))
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(dbpath (db-path database)))
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(t (format nil "~A" object-attribute)))))
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(concatenate 'string dbpath "/indexes/by_" name "/")))
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; Example: returns "./storage/cars/partitions/by_color/Red/".
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(defun db/partition/get-directory-path (database name object-attribute)
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(defun db/partition/get-directory-path (dbpath name object-attribute)
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(let ((value (typecase object-attribute
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(string object-attribute)
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(symbol (symbol-name object-attribute))
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(t (format nil "~A" object-attribute))))
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(dbpath (db-path database)))
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(t (format nil "~A" object-attribute)))))
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(concatenate 'string dbpath "/partitions/by_" name "/" value "/")))
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; Example: returns "Corvet".
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(defun db/index/get-filename (database index-name object)
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(get-object-attribute (db-struct-name database) index-name object))
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; Example: database "name" object -> "./storage/cars/indexes/by_name/Corvet".
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(defun db/index/get-symlink-path (database index-name object)
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(defun db/index/get-symlink-path (dbpath index-name fsymbol object)
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(concatenate 'string
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(db/index/get-directory-path database index-name)
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(db/index/get-filename database index-name object)))
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(db/index/get-directory-path dbpath index-name)
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(funcall fsymbol object)))
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; Example: database "name" object "0000000015"
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; -> (osicat:make-link "./storage/cars/indexes/by_name/Corvet"
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; :target "../../data/0000000015"
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; :hard nil)
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(defun db/index/new (database index-name object file-name)
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(let ((symlink-path (db/index/get-symlink-path database index-name object)))
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(defun db/index/new (dbpath index-name fsymbol object file-name)
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(let ((symlink-path (db/index/get-symlink-path dbpath index-name fsymbol object)))
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; Works even when the database directory is moved.
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(osicat:make-link symlink-path
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:target (concatenate 'string "../../data/" file-name)
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:hard nil)
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))
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:hard nil)))
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(defun db/index/del (database index-name object)
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(delete-file (db/index/get-symlink-path database index-name object)))
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(defun db/index/del (dbpath index-name fsymbol object)
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(delete-file (db/index/get-symlink-path dbpath index-name fsymbol object)))
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; Example: database "color" object
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; -> "./storage/cars/partitions/by_color/Red/0000000015".
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(defun db/partition/get-symlink-path (database partition-name object file-name)
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(defun db/partition/get-symlink-path (dbpath partition-name fsymbol object file-name)
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(concatenate 'string
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(db/partition/get-directory-path database partition-name
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(db/partition/get-directory-path dbpath partition-name
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; example: "Red"
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(get-object-attribute (db-struct-name database) partition-name object))
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(funcall fsymbol object))
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; example: "0000000015"
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file-name))
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@ -129,9 +112,9 @@
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; -> (osicat:make-link "./storage/cars/partitions/by_color/Red/0000000015"
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; :target "../../../data/0000000015"
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; :hard nil)
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(defun db/partition/new (database partition-name object file-name)
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(defun db/partition/new (dbpath partition-name fsymbol object file-name)
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(let ((symlink-path
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(db/partition/get-symlink-path database partition-name object file-name)))
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(db/partition/get-symlink-path dbpath partition-name fsymbol object file-name)))
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(ensure-directories-exist symlink-path)
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@ -140,64 +123,66 @@
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:target (concatenate 'string "../../../data/" file-name)
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:hard nil)))
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(defun db/partition/del (database partition-name object file-basename)
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(delete-file (db/partition/get-symlink-path database partition-name object file-basename)))
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(defun db/partition/del (dbpath partition-name fsymbol object file-basename)
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(delete-file (db/partition/get-symlink-path dbpath partition-name fsymbol object file-basename)))
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; example: db-path/indexes/by_name/
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(defun db/new-index (database attribute-name)
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(defun db/new-index (database attribute-name fsymbol)
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; Create a directory for the indexes.
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(ensure-directories-exist
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(concatenate 'string (db-path database) "/indexes/by_" attribute-name "/"))
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; Add this new index to the list.
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(push attribute-name (db-indexes database))
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(setf (gethash attribute-name (db-indexes database)) fsymbol)
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; Generate index for all DB elements.
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(maphash #'(lambda (number element)
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(handler-case (db/index/new database attribute-name element (number->filename number))
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(handler-case (db/index/new (db-path database) attribute-name fsymbol element (number->filename number))
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(OSICAT-POSIX:EEXIST ()
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(format t "db/new-index: symlink already exists, ignoring.~&"))))
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(db-data database)))
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(defun db/partition/update (database partition-name object file-name old-object)
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(let ((new-value (get-object-attribute (db-struct-name database) partition-name object))
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(old-value (get-object-attribute (db-struct-name database) partition-name old-object)))
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(defun db/partition/update (dbpath partition-name fsymbol object file-name old-object)
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(let ((new-value (funcall fsymbol object))
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(old-value (funcall fsymbol old-object)))
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(if (not (equal new-value old-value))
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(progn
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; delete old partition
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(db/partition/del database partition-name old-object file-name)
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(db/partition/del dbpath partition-name fsymbol old-object file-name)
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; create new partition
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(db/partition/new database partition-name object file-name)))))
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(db/partition/new dbpath partition-name fsymbol object file-name)))))
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; example: db-path/partitions/by_color/
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(defun db/new-partition (database attribute-name)
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; Create a directory for the partitions.
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(ensure-directories-exist
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(concatenate 'string (db-path database) "/partitions/by_" attribute-name "/"))
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(defun db/new-partition (database attribute-name fsymbol)
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(let (dbpath (db-path database))
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; create a directory for the partitions
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(ensure-directories-exist
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(concatenate 'string dbpath "/partitions/by_" attribute-name "/"))
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; Add this new index to the list.
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(push attribute-name (db-partitions database))
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; add this new partition to the list
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(setf (gethash attribute-name (db-partitions database)) fsymbol)
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; Generate partition for all DB elements.
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(maphash #'(lambda (number element)
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(handler-case (db/partition/new database attribute-name element (number->filename number))
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(OSICAT-POSIX:EEXIST ()
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(format t "db/new-partition: symlink already exists, ignoring.~&"))))
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(db-data database)))
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; generate partition for all DB elements
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(maphash #'(lambda (number object)
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(handler-case (db/partition/new dbpath attribute-name fsymbol object (number->filename number))
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(OSICAT-POSIX:EEXIST ()
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(format t "db/new-partition: symlink already exists, ignoring.~&"))))
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(db-data database))))
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; Example: database -> "000000000000018".
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(defun db/add/new-data-basename (database)
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(number->filename (db-current-index database)))
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; Example: {db-path}/data/000000000000018
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(defun get-filepath (database file-name)
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(concatenate 'string (db-path database) "/data/" file-name))
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(defun get-filepath (dbpath file-name)
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(concatenate 'string dbpath "/data/" file-name))
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(defun db/add (database object)
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(incf (db-current-index database))
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(let* ((file-basename (db/add/new-data-basename database))
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(dbpath (db-path database))
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(tmp-file-basename (concatenate 'string file-basename "_tmp"))
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(tmp-file-path (get-filepath database tmp-file-basename)))
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(tmp-file-path (get-filepath dbpath tmp-file-basename)))
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; write object to temporary file
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(util:write-object-to-file object tmp-file-path)
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@ -205,13 +190,15 @@
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; rename the temporary file
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(rename-file tmp-file-path file-basename)
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; handle indexes
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(loop for index in (db-indexes database)
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do (db/index/new database index object file-basename))
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; generate indexes
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(maphash #'(lambda (index-name fsymbol)
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(db/index/new dbpath index-name fsymbol object file-basename))
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(db-indexes database))
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; handle partitions
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(loop for partition in (db-partitions database)
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do (db/partition/new database partition object file-basename)))
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; generate partitions
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(maphash #'(lambda (partition-name fsymbol)
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(db/partition/new dbpath partition-name fsymbol object file-basename))
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(db-partitions database)))
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; store new in-memory data
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; database.data[database.current-index] = object
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@ -220,17 +207,20 @@
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(defun db/del (database object-index)
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(let ((file-basename (number->filename object-index))
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(object (gethash object-index (db-data database))))
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(dbpath (db-path database))
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(object (gethash object-index (db-data database))))
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; remove data file
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(delete-file (get-filepath database file-basename))
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(delete-file (get-filepath dbpath file-basename))
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; handle indexes
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(loop for index in (db-indexes database)
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do (db/index/del database index object))
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(maphash #'(lambda (index-name fsymbol)
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(db/index/del dbpath index-name fsymbol object))
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(db-indexes database))
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; handle partitions
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(loop for partition in (db-partitions database)
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do (db/partition/del database partition object file-basename))
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(maphash #'(lambda (partition-name fsymbol)
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(db/partition/del dbpath partition-name fsymbol object file-basename))
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(db-partitions database))
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; remove in-memory data
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(remhash object-index (db-data database))))
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@ -240,52 +230,52 @@
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(filename->integer
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(osicat:read-link
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(concatenate 'string
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(db/index/get-directory-path database index-name) "/" value))))
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; (util:read-object-from-file (concatenate 'string
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; (db/index/get-directory-path database index-name) "/" value)))
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(db/index/get-directory-path (db-path database) index-name) "/" value))))
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; Search for the data from the FS.
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(defun db/get-by-partition (database name value)
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(loop for filename in (osicat:list-directory (db/partition/get-directory-path database name value))
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collect (filename->integer filename)))
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(defun db/index/update (database index-name object file-name old-object)
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(let* ((struct-name (db-struct-name database))
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(new-value (get-object-attribute struct-name index-name object))
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(old-value (get-object-attribute struct-name index-name old-object))
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(symlink-path (db/index/get-symlink-path database index-name object)))
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(defun db/index/update (dbpath index-name fsymbol object file-name old-object)
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(let* ((new-value (funcall fsymbol object))
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(old-value (funcall fsymbol old-object))
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(symlink-path (db/index/get-symlink-path dbpath index-name fsymbol object)))
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(if (not (equal new-value old-value))
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; display a message in case the new index is already used by another object
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(if (probe-file symlink-path)
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(format t "db/index/update: the value ~a is already used by another object.~&" new-value)
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(progn
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; delete old index
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(db/index/del database index-name old-object)
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(db/index/del dbpath index-name fsymbol old-object)
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; create new index
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(db/index/new database index-name object file-name))))))
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(db/index/new dbpath index-name fsymbol object file-name))))))
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; TODO: check database integrity (redundancy)
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; TODO: locking
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(defun db/update (database object-index)
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(let* ((object (gethash object-index (db-data database)))
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(dbpath (db-path database))
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(file-basename (number->filename object-index))
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(file-path (get-filepath database file-basename))
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(file-path (get-filepath dbpath file-basename))
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(old-object (util:read-object-from-file file-path))
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(tmp-file-basename (concatenate 'string file-basename "_tmp"))
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(tmp-file-path (get-filepath database tmp-file-basename)))
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(tmp-file-path (get-filepath dbpath tmp-file-basename)))
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; write object to temporary file
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(util:write-object-to-file object tmp-file-path)
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(delete-file file-path)
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(delete-file file-path)
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; rename the temporary file
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(rename-file tmp-file-path file-basename)
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; handle indexes
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(loop for index in (db-indexes database)
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do (db/index/update database index object file-basename old-object))
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(maphash #'(lambda (index-name fsymbol)
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(db/index/update dbpath index-name fsymbol object file-basename old-object))
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(db-indexes database))
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; handle partitions
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(loop for partition in (db-partitions database)
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do (db/partition/update database partition object file-basename old-object))))
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(maphash #'(lambda (partition-name fsymbol)
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(db/partition/update dbpath partition-name fsymbol object file-basename old-object))
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(db-partitions database)))
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