litestore.nim
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import sqlite3, db_sqlite as db, strutils, os, oids, times, json, pegs import contenttypes, queries {.compile: "vendor/sqlite/libsqlite3.c".} {.passC: "-DSQLITE_ENABLE_FTS3 -DSQLITE_ENABLE_FTS3_PARENTHESIS".} type EDatastoreExists* = object of Exception EDatastoreDoesNotExist* = object of Exception EDatastoreUnavailable* = object of Exception Datastore* = object db: TDbConn path: string name: string QueryOptions* = object single*:bool # limit*: int # orderby*: string # tags*: string search*: string proc newQueryOptions(): QueryOptions = return QueryOptions(single: false, limit: 0, orderby: "", tags: "", search: "") # TODO manage stores directory let cwd = getCurrentDir() # Helper Functions proc validOrderBy(clause):bool = return clause == "id ASC" or clause == "id DESC" or clause == "created ASC" or clause == "created DESC" or clause == "modified ASC" or clause == "modified DESC" proc prepareSelectDocumentsQuery(options: QueryOptions): string = result = "SELECT * " result = result & "FROM documents, searchcontents " result = result & "WHERE documents.id = searchcontents.document_id " if options.single: result = result & "AND documents.id = ?" if options.orderby.validOrderBy(): result = result & "ORDER BY " & options.orderby&" " if options.limit > 0: result = result & "LIMIT " & $options.limit & " " echo result proc prepareSelectTagsQuery(options: QueryOptions): string = result = "SELECT tag_id, COUNT(document_ID) " result = result & "FROM tags " if options.single: result = result & "WHERE tag_id = ?" result = result & "GROUP BY tag_id" if options.orderby.validOrderBy(): result = result & "ORDER BY " & options.orderby&" " if options.limit > 0: result = result & "LIMIT " & $options.limit & " " echo result proc prepareJsonDocument(store:Datastore, doc: TRow): JsonNode = var raw_tags = store.db.getAllRows(SQL_SELECT_DOCUMENT_TAGS, doc[0]) var tags = newSeq[JsonNode](0) for tag in raw_tags: tags.add(%($(tag[0]))) return %[("id", %doc[0]), ("data", %doc[1]), ("created", %doc[5]), ("modified", %doc[5]), ("tags", %tags)] proc checkIfBinary(binary:int, contenttype:string): int = if binary == -1 and contenttype.isBinary: return 1 else: return 0 proc addDocumentSystemTags(store: Datastore, docid, contenttype: string) = var splittype = contenttype.split("/") var tags = newSeq[string](0) tags.add "$type:"&splittype[0] tags.add "$subtype:"&splittype[1] var binary = checkIfBinary(-1, contenttype) if binary == 1: tags.add "$format:binary" else: tags.add "$format:text" for tag in tags: store.db.exec(SQL_INSERT_TAG, tag, docid) proc deleteDocumentSystemTags(store: Datastore, docid) = store.db.exec(SQL_DELETE_DOCUMENT_SYSTEM_TAGS, docid) # Manage Datastores proc createDatastore*(name:string) = if name.changeFileExt("ls").fileExists: raise newException(EDatastoreExists, "Datastore '$1' already exists." % name) let store = db.open(cwd.joinPath(name.changeFileExt("ls")), "", "", "") store.exec(SQL_CREATE_DOCUMENTS_TABLE) store.exec(SQL_CREATE_SEARCHCONTENTS_TABLE) store.exec(SQL_CREATE_TAGS_TABLE) proc deleteDatastore*(name:string) = try: cwd.joinPath(name.changeFileExt("ls")).removeFile except: raise newException(EDatastoreUnavailable, "Datastore '$1' cannot deleted." % name) proc openDatastore(name:string): Datastore = if not name.changeFileExt("ls").fileExists: raise newException(EDatastoreDoesNotExist, "Datastore '$1' does not exists." % name) try: result.db = db.open(cwd.joinPath(name.changeFileExt("ls")), "", "", "") result.name = name result.path = cwd.joinPath(name) except: raise newException(EDatastoreUnavailable, "Datastore '$1' cannot be opened." % name) proc closeDatastore(store:Datastore) = try: db.close(store.db) except: raise newException(EDatastoreUnavailable, "Datastore '$1' cannot be closed." % store.name) proc retrieveDatastores*(): string = var stores = newSeq[JsonNode](0) for f in walkFiles(cwd.joinPath("*.ls")): var name = f.extractFilename.changeFileExt("") var store = name.openDataStore() var n_documents = store.db.getRow(SQL_COUNT_DOCUMENTS)[0].parseInt var n_tags = store.db.getRow(SQL_COUNT_TAGS)[0].parseInt stores.add(%[("id", %name), ("documents", %n_documents), ("tags", %n_tags)]) store.closeDatastore() return $(%(stores)) proc createDocument*(store: Datastore, data = "", contenttype = "text/plain", binary = -1, searchable = 1): string = var binary = checkIfBinary(binary, contenttype) result = $genOid() # Store document store.db.exec(SQL_INSERT_DOCUMENT, result, data, contenttype, binary, searchable, getTime().getGMTime().format("yyyy-MM-dd'T'hh:mm:ss'Z'")) if binary == 0 and searchable == 1: # Add to search index store.db.exec(SQL_INSERT_SEARCHCONTENT, result, data) store.addDocumentSystemTags(result, contenttype) return result proc updateDocument*(store: Datastore, id: string, data: string, contenttype = "text/plain", binary = -1, searchable = true) = var binary = checkIfBinary(binary, contenttype) store.db.exec(SQL_UPDATE_DOCUMENT, data, contenttype, binary, searchable, getTime().getGMTime().format("yyyy-MM-dd'T'hh:mm:ss'Z'"), id) store.deleteDocumentSystemTags(id) store.addDocumentSystemTags(id, contenttype) store.db.exec(SQL_UPDATE_SEARCHCONTENT, data, id) proc deleteDocument*(store: Datastore, id: string) = store.db.exec(SQL_DELETE_DOCUMENT, id) store.db.exec(SQL_DELETE_SEARCHCONTENT, id) store.db.exec(SQL_DELETE_DOCUMENT_TAGS, id) proc retrieveDocument*(store: Datastore, id: string, options: QueryOptions = newQueryOptions()): string = var options = options options.single = true var select = prepareSelectDocumentsQuery(options) var raw_document = store.db.getRow(select.sql, id) return $store.prepareJsonDocument(raw_document) proc retrieveDocuments*(store: Datastore, options: QueryOptions = newQueryOptions()): string = var select = prepareSelectDocumentsQuery(options) var raw_documents = store.db.getAllRows(select.sql) var documents = newSeq[JsonNode](0) for doc in raw_documents: documents.add store.prepareJsonDocument(doc) return $(%documents) proc createTag*(store: Datastore, tagid, documentid: string) = store.db.exec(SQL_INSERT_TAG, tagid, documentid) proc deleteTag*(store: Datastore, tagid, documentid: string) = store.db.exec(SQL_DELETE_TAG, documentid, tagid) proc retrieveTag*(store: Datastore, id: string, options: QueryOptions = newQueryOptions()): string = var options = options options.single = true var query = prepareSelectTagsQuery(options) var raw_tag = store.db.getRow(query.sql, id) return $(%[("id", %raw_tag[0]), ("documents", %(raw_tag[1].parseInt))]) proc retrieveTags*(store: Datastore, options: QueryOptions = newQueryOptions()): string = var query = prepareSelectTagsQuery(options) var raw_tags = store.db.getAllRows(query.sql) var tags = newSeq[JsonNode](0) for tag in raw_tags: tags.add(%[("id", %tag[0]), ("documents", %(tag[1].parseInt))]) return $(%tags) # TODO Pack/Unpack Directories proc packDir*(store: Datastore, dir: string) = discard proc unpackDir*(store: Datastore, dir: string) = discard # Test var name = "test" var file = cwd.joinPath(name&".ls") if file.fileExists: file.removeFile createDatastore(name) var store = name.openDatastore var id1 = store.createDocument "This is a test document" var id2 = store.createDocument "This is another test document" var id3 = store.createDocument "This is yet another test document" store.createTag "test1", id1 store.createTag "test2", id2 store.createTag "test3", id2 store.createTag "test", id1 store.createTag "test", id2 store.createTag "test", id3 var opts = newQueryOptions() opts.limit = 2 opts.orderby = "created DESC" echo store.retrieveDocuments(opts) echo retrieveDatastores() echo store.retrieveTags() |