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ReadingListSQLStorage.swift
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ReadingListSQLStorage.swift
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
import Foundation
import SQLite
import Shared
class ReadingListSQLStorage: ReadingListStorage {
var db: Connection!
let items: Table!
struct ItemColumns {
// Client Metadata
static let ClientId = Expression<Int64>("client_id")
static let ClientLastModified = Expression<Int64>("client_last_modified")
// Server Metadata
static let Id = Expression<String?>("id")
static let LastModified = Expression<Int64?>("last_modified")
// Properties
static let Url = Expression<String>("url")
static let Title = Expression<String>("title")
static let AddedBy = Expression<String>("added_by")
static let Archived = Expression<Bool>("archived")
static let Favorite = Expression<Bool>("favorite")
static let Unread = Expression<Bool>("unread")
}
init(path: String) {
db = try! Connection(path)
items = Table("items")
do {
try db.run(items.create(temporary: false, ifNotExists: true, block: { (t: SQLite.TableBuilder) in
// Client Metadata
t.column(ItemColumns.ClientId, primaryKey: .autoincrement)
t.column(ItemColumns.ClientLastModified)
// Server Metadata
t.column(ItemColumns.Id) // TODO Unique but may be null?
t.column(ItemColumns.LastModified)
// Properties
t.column(ItemColumns.Url, unique: true)
t.column(ItemColumns.Title)
t.column(ItemColumns.AddedBy)
t.column(ItemColumns.Archived, defaultValue: false)
t.column(ItemColumns.Favorite, defaultValue: false)
t.column(ItemColumns.Unread, defaultValue: true)
}))
} catch {
print("Unable to create items database '\(error)")
}
}
func getAllRecords() -> Maybe<[ReadingListClientRecord]> {
do {
let preparedItems = try db.prepare(items)
return Maybe(success: Array(preparedItems).map {ReadingListClientRecord(row: self.rowToDictionary($0))!})
} catch {
return Maybe(failure: ReadingListStorageError("Can't fetch all records: \(error)"))
}
}
func getNewRecords() -> Maybe<[ReadingListClientRecord]> {
do {
let preparedItems = try db.prepare(items.filter(ItemColumns.Id == nil))
return Maybe(success: Array(preparedItems).map {ReadingListClientRecord(row: self.rowToDictionary($0))!})
} catch {
return Maybe(failure: ReadingListStorageError("Can't fetch all records: \(error)"))
}
}
func getUnreadRecords() -> Maybe<[ReadingListClientRecord]> {
do {
let preparedItems = try db.prepare(items.filter(ItemColumns.Unread == true))
return Maybe(success: Array(preparedItems).map {ReadingListClientRecord(row: self.rowToDictionary($0))!})
} catch {
return Maybe(failure: ReadingListStorageError("Can't fetch all records: \(error)"))
}
}
func getAvailableRecords() -> Maybe<[ReadingListClientRecord]> {
do {
let preparedItems = try db.prepare(items.order(ItemColumns.ClientLastModified.desc))
return Maybe(success: Array(preparedItems).map {ReadingListClientRecord(row: self.rowToDictionary($0))!})
} catch {
return Maybe(failure: ReadingListStorageError("Can't fetch all records: \(error)"))
}
}
func deleteRecord(_ record: ReadingListClientRecord) -> Maybe<Void> {
print("Trying to delete record with id \(record.clientMetadata.id)\n")
let query = items.filter(ItemColumns.ClientId == record.clientMetadata.id)
do {
try db.run(query.delete())
return Maybe(success: Void())
} catch {
return Maybe(failure: ReadingListStorageError("Failed to delete"))
}
}
func deleteAllRecords() -> Maybe<Void> {
do {
try db.run(self.items.delete())
return Maybe(success: Void())
} catch {
return Maybe(failure: ReadingListStorageError("Failed to delete"))
}
}
func createRecordWithURL(_ url: String, title: String, addedBy: String) -> Maybe<ReadingListClientRecord> {
let insert = items.insert(ItemColumns.ClientLastModified <- ReadingListNow(), ItemColumns.Url <- url, ItemColumns.Title <- title, ItemColumns.AddedBy <- addedBy)
do {
let id = try db.run(insert)
let preparedItems = try db.prepare(items.filter(ItemColumns.ClientId == id))
if let item = Array(preparedItems).first {
if let record = ReadingListClientRecord(row: rowToDictionary(item)) {
return Maybe(success: record)
} else {
return Maybe(failure: ReadingListStorageError("Can't create RLCR from row"))
}
} else {
return Maybe(failure: ReadingListStorageError("Can't get first item from results"))
}
} catch {
return Maybe(failure: ReadingListStorageError("Can't insert: \(error)"))
}
}
func getRecordWithURL(_ url: String) -> Maybe<ReadingListClientRecord?> {
do {
let preparedItems = try db.prepare(items.filter(ItemColumns.Url == url))
if let item = Array(preparedItems).first {
if let record = ReadingListClientRecord(row: rowToDictionary(item)) {
return Maybe(success: record)
} else {
return Maybe(failure: ReadingListStorageError("Can't create RLCR from row"))
}
} else {
return Maybe(success: nil)
}
} catch {
return Maybe(failure: ReadingListStorageError("Can't fetch: \(error)"))
}
}
func updateRecord(_ record: ReadingListClientRecord, unread: Bool) -> Maybe<ReadingListClientRecord?> {
let query = items.filter(ItemColumns.ClientId == record.clientMetadata.id).update(ItemColumns.Unread <- unread)
do {
try db.run(query)
let preparedItems = try db.prepare(items.filter(ItemColumns.ClientId == record.clientMetadata.id))
if let item = Array(preparedItems).first {
if let record = ReadingListClientRecord(row: rowToDictionary(item)) {
return Maybe(success: record)
} else {
return Maybe(failure: ReadingListStorageError("Can't create RLCR from row"))
}
} else {
return Maybe(success: nil)
}
} catch {
return Maybe(success: nil)
}
}
fileprivate func rowToDictionary(_ row: Row) -> [String: Any] {
var result: [String: Any] = [:]
result["client_id"] = NSNumber(value: row.get(ItemColumns.ClientId))
result["client_last_modified"] = NSNumber(value: row.get(ItemColumns.ClientLastModified))
result["id"] = row.get(ItemColumns.Id)
result["last_modified"] = NSNumber(value: row.get(ItemColumns.LastModified) ?? 0)
result["url"] = row.get(ItemColumns.Url)
result["title"] = row.get(ItemColumns.Title)
result["added_by"] = row.get(ItemColumns.AddedBy)
result["archived"] = row.get(ItemColumns.Archived)
result["favorite"] = row.get(ItemColumns.Favorite)
result["unread"] = row.get(ItemColumns.Unread)
return result
}
}