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Improve context data modeling

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Justin Mazzocchi 2020-09-01 19:39:06 -07:00
parent bc59acd160
commit 6307381375
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GPG key ID: E223E6937AAFB01C
5 changed files with 135 additions and 124 deletions
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217
ServiceLayer/Sources/ServiceLayer/Database/ContentDatabase.swift
View file

@ -24,21 +24,52 @@ struct ContentDatabase {
}
try Self.migrate(databaseQueue)
try Self.createTemporaryTables(databaseQueue)
}
}
extension ContentDatabase {
func insert(statuses: [Status], collection: StatusCollection? = nil) -> AnyPublisher<Never, Error> {
func insert(statuses: [Status], timeline: Timeline? = nil) -> AnyPublisher<Never, Error> {
databaseQueue.writePublisher {
try collection?.save($0)
try timeline?.save($0)
for status in statuses {
for component in status.storedComponents() {
try component.save($0)
}
try collection?.joinRecord(status: status).save($0)
if let timeline = timeline {
try TimelineStatusJoin(timelineId: timeline.id, statusId: status.id).save($0)
}
}
}
.ignoreOutput()
.eraseToAnyPublisher()
}
func insert(context: Context, parentID: String) -> AnyPublisher<Never, Error> {
databaseQueue.writePublisher {
for status in context.ancestors + context.descendants {
for component in status.storedComponents() {
try component.save($0)
}
}
for (section, statuses) in [(StatusContextJoin.Section.ancestors, context.ancestors),
(StatusContextJoin.Section.descendants, context.descendants)] {
for (index, status) in statuses.enumerated() {
try StatusContextJoin(
parentId: parentID,
statusId: status.id,
section: section,
index: index)
.save($0)
}
try StatusContextJoin.filter(
Column("parentId") == parentID
&& Column("section") == section.rawValue
&& Column("index") >= statuses.count)
.deleteAll($0)
}
}
.ignoreOutput()
@ -93,11 +124,28 @@ extension ContentDatabase {
.eraseToAnyPublisher()
}
func statusesObservation(collection: StatusCollection) -> AnyPublisher<[Status], Error> {
ValueObservation.tracking(collection.fetch)
func statusesObservation(timeline: Timeline) -> AnyPublisher<[[Status]], Error> {
ValueObservation.tracking(timeline.statuses.fetchAll)
.removeDuplicates()
.publisher(in: databaseQueue)
.map { [$0.map(Status.init(statusResult:))] }
.eraseToAnyPublisher()
}
func contextObservation(parentID: String) -> AnyPublisher<[[Status]], Error> {
ValueObservation.tracking { db -> [[StatusResult]] in
guard let parent = try StoredStatus.filter(Column("id") == parentID).statusResultRequest.fetchOne(db) else {
return [[]]
}
let ancestors = try parent.status.ancestors.fetchAll(db)
let descendants = try parent.status.descendants.fetchAll(db)
return [ancestors, [parent], descendants]
}
.removeDuplicates()
.publisher(in: databaseQueue)
.map { $0.map(Status.init(statusResult:)) }
.map { $0.map { $0.map(Status.init(statusResult:)) } }
.eraseToAnyPublisher()
}
@ -209,6 +257,21 @@ private extension ContentDatabase {
t.primaryKey(["timelineId", "statusId"], onConflict: .replace)
}
try db.create(table: "statusContextJoin", ifNotExists: true) { t in
t.column("parentId", .text)
.indexed()
.notNull()
.references("storedStatus", column: "id", onDelete: .cascade, onUpdate: .cascade)
t.column("statusId", .text)
.indexed()
.notNull()
.references("storedStatus", column: "id", onDelete: .cascade, onUpdate: .cascade)
t.column("section", .text).notNull()
t.column("index", .integer).notNull()
t.primaryKey(["parentId", "statusId"], onConflict: .replace)
}
try db.create(table: "filter", ifNotExists: true) { t in
t.column("id", .text).notNull().primaryKey(onConflict: .replace)
t.column("phrase", .text).notNull()
@ -222,23 +285,6 @@ private extension ContentDatabase {
try migrator.migrate(writer)
}
// swiftlint:enable function_body_length
static func createTemporaryTables(_ writer: DatabaseWriter) throws {
try writer.write { database in
try database.create(table: "transientStatusCollection", temporary: true, ifNotExists: true) { t in
t.column("id", .text).notNull().primaryKey(onConflict: .replace)
}
try database.create(table: "transientStatusCollectionElement", temporary: true, ifNotExists: true) { t in
t.column("transientStatusCollectionId", .text)
.notNull()
.references("transientStatusCollection", column: "id", onDelete: .cascade, onUpdate: .cascade)
t.column("statusId", .text).notNull()
t.primaryKey(["transientStatusCollectionId", "statusId"], onConflict: .replace)
}
}
}
}
extension Account: FetchableRecord, PersistableRecord {
@ -251,13 +297,6 @@ extension Account: FetchableRecord, PersistableRecord {
}
}
public protocol StatusCollection: FetchableRecord, PersistableRecord {
var id: String { get }
var fetch: (Database) throws -> [StatusResult] { get }
func joinRecord(status: Status) -> PersistableRecord
}
private struct TimelineStatusJoin: Codable, FetchableRecord, PersistableRecord {
let timelineId: String
let statusId: String
@ -265,7 +304,7 @@ private struct TimelineStatusJoin: Codable, FetchableRecord, PersistableRecord {
static let status = belongsTo(StoredStatus.self)
}
extension Timeline: StatusCollection {
extension Timeline: FetchableRecord, PersistableRecord {
enum Columns: String, ColumnExpression {
case id, listTitle
}
@ -292,34 +331,64 @@ extension Timeline: StatusCollection {
container[Columns.listTitle] = list.title
}
}
public var fetch: (Database) throws -> [StatusResult] {
statuses
.including(required: StoredStatus.account)
.including(optional: StoredStatus.reblogAccount)
.including(optional: StoredStatus.reblog)
.asRequest(of: StatusResult.self)
.fetchAll
}
public func joinRecord(status: Status) -> PersistableRecord {
TimelineStatusJoin(timelineId: id, statusId: status.id)
}
}
private extension Timeline {
static let statusJoins = hasMany(TimelineStatusJoin.self)
static let statuses = hasMany(
StoredStatus.self,
through: statusJoins,
using: TimelineStatusJoin.status)
.order(Column("createdAt").desc)
static let statuses = hasMany(StoredStatus.self,
through: statusJoins,
using: TimelineStatusJoin.status).order(Column("createdAt").desc)
var statuses: QueryInterfaceRequest<StatusResult> {
request(for: Self.statuses).statusResultRequest
}
}
var statusJoins: QueryInterfaceRequest<TimelineStatusJoin> {
request(for: Self.statusJoins)
private struct StatusContextJoin: Codable, FetchableRecord, PersistableRecord {
enum Section: String, Codable {
case ancestors
case descendants
}
var statuses: QueryInterfaceRequest<StoredStatus> {
request(for: Self.statuses)
let parentId: String
let statusId: String
let section: Section
let index: Int
static let status = belongsTo(StoredStatus.self, using: ForeignKey([Column("statusId")]))
}
private extension StoredStatus {
static let ancestorJoins = hasMany(StatusContextJoin.self, using: ForeignKey([Column("parentID")]))
.filter(Column("section") == StatusContextJoin.Section.ancestors.rawValue)
.order(Column("index"))
static let descendantJoins = hasMany(StatusContextJoin.self, using: ForeignKey([Column("parentID")]))
.filter(Column("section") == StatusContextJoin.Section.descendants.rawValue)
.order(Column("index"))
static let ancestors = hasMany(StoredStatus.self,
through: ancestorJoins,
using: StatusContextJoin.status)
static let descendants = hasMany(StoredStatus.self,
through: descendantJoins,
using: StatusContextJoin.status)
var ancestors: QueryInterfaceRequest<StatusResult> {
request(for: Self.ancestors).statusResultRequest
}
var descendants: QueryInterfaceRequest<StatusResult> {
request(for: Self.descendants).statusResultRequest
}
}
private extension QueryInterfaceRequest where RowDecoder == StoredStatus {
var statusResultRequest: QueryInterfaceRequest<StatusResult> {
including(required: StoredStatus.account)
.including(optional: StoredStatus.reblogAccount)
.including(optional: StoredStatus.reblog)
.asRequest(of: StatusResult.self)
}
}
@ -333,43 +402,7 @@ extension Filter: FetchableRecord, PersistableRecord {
}
}
private struct TransientStatusCollectionElement: Codable, FetchableRecord, PersistableRecord {
let transientStatusCollectionId: String
let statusId: String
static let status = belongsTo(StoredStatus.self, key: "statusId")
}
extension TransientStatusCollection: StatusCollection {
public var fetch: (Database) throws -> [StatusResult] {
{
try StatusResult.fetchAll(
$0,
StoredStatus.filter(
try elements
.fetchAll($0)
.map(\.statusId)
.contains(Column("id")))
.including(required: StoredStatus.account)
.including(optional: StoredStatus.reblogAccount)
.including(optional: StoredStatus.reblog))
}
}
public func joinRecord(status: Status) -> PersistableRecord {
TransientStatusCollectionElement(transientStatusCollectionId: id, statusId: status.id)
}
}
private extension TransientStatusCollection {
static let elements = hasMany(TransientStatusCollectionElement.self)
var elements: QueryInterfaceRequest<TransientStatusCollectionElement> {
request(for: Self.elements)
}
}
private struct StoredStatus: Codable, Hashable {
struct StoredStatus: Codable, Hashable {
let id: String
let uri: String
let createdAt: Date
@ -461,11 +494,11 @@ extension StoredStatus: FetchableRecord, PersistableRecord {
}
}
public struct StatusResult: Codable, Hashable, FetchableRecord {
struct StatusResult: Codable, Hashable, FetchableRecord {
let account: Account
fileprivate let status: StoredStatus
let status: StoredStatus
let reblogAccount: Account?
fileprivate let reblog: StoredStatus?
let reblog: StoredStatus?
}
private extension Status {

11
ServiceLayer/Sources/ServiceLayer/Entities/TransientStatusCollection.swift
View file

@ -1,11 +0,0 @@
// Copyright © 2020 Metabolist. All rights reserved.
import Foundation
public struct TransientStatusCollection: Codable {
public let id: String
public init(id: String) {
self.id = id
}
}

24
ServiceLayer/Sources/ServiceLayer/Status List Services/ContextService.swift
View file

@ -12,24 +12,12 @@ public struct ContextService {
private let context = CurrentValueSubject<Context, Never>(Context(ancestors: [], descendants: []))
private let networkClient: APIClient
private let contentDatabase: ContentDatabase
private let collection: TransientStatusCollection
init(status: Status, networkClient: APIClient, contentDatabase: ContentDatabase) {
self.status = status
self.networkClient = networkClient
self.contentDatabase = contentDatabase
collection = TransientStatusCollection(id: "context-\(status.id)")
statusSections = contentDatabase.statusesObservation(collection: collection)
.combineLatest(context.setFailureType(to: Error.self))
.map { statuses, context in
[
context.ancestors.map { a in statuses.first { $0.id == a.id } ?? a },
[statuses.first { $0.id == status.id } ?? status],
context.descendants.map { d in statuses.first { $0.id == d.id } ?? d }
]
}
.removeDuplicates()
.eraseToAnyPublisher()
statusSections = contentDatabase.contextObservation(parentID: status.id)
}
}
@ -69,12 +57,14 @@ extension ContextService: StatusListService {
public func request(maxID: String?, minID: String?) -> AnyPublisher<Never, Error> {
Publishers.Merge(
networkClient.request(StatusEndpoint.status(id: status.id))
.map { ([$0], collection) }
.flatMap(contentDatabase.insert(statuses:collection:)),
.map { ([$0], nil) }
.flatMap(contentDatabase.insert(statuses:timeline:))
.eraseToAnyPublisher(),
networkClient.request(ContextEndpoint.context(id: status.id))
.handleEvents(receiveOutput: context.send)
.map { ($0.ancestors + $0.descendants, collection) }
.flatMap(contentDatabase.insert(statuses:collection:)))
.map { ($0, status.id) }
.flatMap(contentDatabase.insert(context:parentID:))
.eraseToAnyPublisher())
.eraseToAnyPublisher()
}

5
ServiceLayer/Sources/ServiceLayer/Status List Services/TimelineService.swift
View file

@ -15,8 +15,7 @@ struct TimelineService {
self.timeline = timeline
self.networkClient = networkClient
self.contentDatabase = contentDatabase
statusSections = contentDatabase.statusesObservation(collection: timeline)
.map { [$0] }
statusSections = contentDatabase.statusesObservation(timeline: timeline)
.eraseToAnyPublisher()
}
}
@ -29,7 +28,7 @@ extension TimelineService: StatusListService {
func request(maxID: String?, minID: String?) -> AnyPublisher<Never, Error> {
networkClient.request(Paged(timeline.endpoint, maxID: maxID, minID: minID))
.map { ($0, timeline) }
.flatMap(contentDatabase.insert(statuses:collection:))
.flatMap(contentDatabase.insert(statuses:timeline:))
.eraseToAnyPublisher()
}

2
ServiceLayer/Sources/ServiceLayer/StatusService.swift
View file

@ -22,7 +22,7 @@ public extension StatusService {
? StatusEndpoint.unfavourite(id: status.id)
: StatusEndpoint.favourite(id: status.id))
.map { ([$0], nil) }
.flatMap(contentDatabase.insert(statuses:collection:))
.flatMap(contentDatabase.insert(statuses:timeline:))
.eraseToAnyPublisher()
}
}