Add metric migration

Package.swift

@@ -8,13 +8,19 @@ let package = Package(
     ],
     dependencies: [
         .package(url: "https://github.com/vapor/vapor", from: "4.0.0"),
-        .package(url: "https://github.com/christophhagen/Clairvoyant", from: "0.5.0"),
+        .package(url: "https://github.com/christophhagen/Clairvoyant", from: "0.9.0"),
+        .package(url: "https://github.com/christophhagen/ClairvoyantVapor", from: "0.2.0"),
+        .package(url: "https://github.com/christophhagen/ClairvoyantBinaryCodable", from: "0.3.0"),
+        .package(url:"https://github.com/christophhagen/CBORCoding", from: "1.0.0"),
     ],
     targets: [
         .target(name: "App",
                 dependencies: [
                     .product(name: "Vapor", package: "vapor"),
                     .product(name: "Clairvoyant", package: "Clairvoyant"),
+                    .product(name: "ClairvoyantVapor", package: "ClairvoyantVapor"),
+                    .product(name: "ClairvoyantBinaryCodable", package: "ClairvoyantBinaryCodable"),
+                    .product(name: "CBORCoding", package: "CBORCoding"),
                 ],
                 swiftSettings: [
                     // Enable better optimizations when building in Release configuration. Despite the use of

Sources/App/Authenticator.swift

@@ -1,8 +1,7 @@
 import Foundation
-import Clairvoyant
 import Vapor
 
-final class Authenticator: MetricAccessManager {
+final class Authenticator {
 
     private var writers: Set<String>
 
@@ -10,7 +9,6 @@ final class Authenticator: MetricAccessManager {
         self.writers = Set(writers)
     }
 
-
     func hasAuthorization(for key: String) -> Bool {
         // Note: This is not a constant-time compare, so there may be an opportunity
         // for timing attack here. Sets perform hashed lookups, so this may be less of an issue,
@@ -20,20 +18,6 @@ final class Authenticator: MetricAccessManager {
         writers.contains(key)
     }
 
-    func metricListAccess(isAllowedForToken accessToken: AccessToken) throws {
-        guard let key = String(data: accessToken, encoding: .utf8) else {
-            return
-        }
-        guard hasAuthorization(for: key) else {
-            throw MetricError.accessDenied
-        }
-    }
-
-    func metricAccess(to metric: MetricId, isAllowedForToken accessToken: AccessToken) throws {
-        try metricListAccess(isAllowedForToken: accessToken)
-    }
-
-
     func authorize(_ request: Request) throws {
         guard let key = request.headers.first(name: "key") else {
             throw Abort(.badRequest) // 400

Sources/App/CapServer.swift

@@ -67,8 +67,8 @@ final class CapServer {
         didSet {
             scheduleSave()
             Task {
-                try? await capCountMetric.update(caps.count)
-                try? await imageCountMetric.update(imageCount)
+                _ = try? await capCountMetric.update(caps.count)
+                _ = try? await imageCountMetric.update(imageCount)
             }
         }
     }

Sources/App/configure.swift

@@ -1,6 +1,10 @@
 import Vapor
 import Foundation
 import Clairvoyant
+import ClairvoyantVapor
+import ClairvoyantBinaryCodable
+
+private var provider: VaporMetricProvider!
 
 public func configure(_ app: Application) async throws {
 
@@ -10,12 +14,7 @@ public func configure(_ app: Application) async throws {
     let config = Config(loadFrom: resourceDirectory)
     let authenticator = Authenticator(writers: config.writers)
 
-    let monitor = await MetricObserver(
-        logFolder: config.logURL,
-        accessManager: authenticator,
-        logMetricId: "caps.log")
-
-    // All new metrics are automatically registered with the standard observer
+    let monitor = MetricObserver(logFileFolder: config.logURL, logMetricId: "caps.log")
     MetricObserver.standard = monitor
 
     let status = try await Metric<ServerStatus>("caps.status",
@@ -28,7 +27,8 @@ public func configure(_ app: Application) async throws {
 
     let server = await CapServer(in: URL(fileURLWithPath: publicDirectory))
 
-    await monitor.registerRoutes(app)
+    provider = .init(observer: monitor, accessManager: config.writers)
+    provider.registerRoutes(app)
 
     if config.serveFiles {
         let middleware = FileMiddleware(publicDirectory: publicDirectory)
@@ -52,7 +52,114 @@ func log(_ message: String) {
         print(message)
         return
     }
+    observer.log(message)
+}
+
+import CBORCoding
+
+public func migrate(folder: URL) throws {
+    try migrateMetric("caps.log", containing: String.self, in: folder)
+    try migrateMetric("caps.status", containing: ServerStatus.self, in: folder)
+    try migrateMetric("caps.count", containing: Int.self, in: folder)
+    try migrateMetric("caps.images", containing: Int.self, in: folder)
+    try migrateMetric("caps.classifier", containing: Int.self, in: folder)
+}
+
+private func migrateMetric<T>(_ id: String, containing type: T.Type, in folder: URL) throws where T: MetricValue {
+    print("Processing metric \(id)")
+    let file = id.hashed()
+    let url = folder.appendingPathComponent(file)
+
+    let files = try FileManager.default.contentsOfDirectory(at: url, includingPropertiesForKeys: nil)
+        .filter { Int($0.lastPathComponent) != nil }
+    print("Found \(files.count) files for \(id)")
+
+    let all: [Timestamped<T>] = try files.map(readElements(from:))
+        .reduce([], +)
+        .sorted { $0.timestamp < $1.timestamp }
+
+    print("Found \(all.count) items for \(id)")
+
+    try FileManager.default.removeItem(at: url)
+
+    print("Removed log folder")
+
+    // TODO: Write values back to disk
+    let observer = MetricObserver(logFileFolder: folder, logMetricId: "sesame.migration")
+    let metric: Metric<T> = observer.addMetric(id: id)
+    let semaphore = DispatchSemaphore(value: 0)
     Task {
-        await observer.log(message)
+        try await metric.update(all)
+        print("Saved all values for metric \(id)")
+        semaphore.signal()
+    }
+    semaphore.wait()
+    print("Finished metric \(id)")
+}
+
+private func readElements<T>(from url: URL) throws -> [Timestamped<T>] where T: MetricValue {
+    let data = try Data(contentsOf: url)
+    let file = url.lastPathComponent
+    print("File \(file): Loaded \(data.count) bytes")
+
+
+
+    let decoder = CBORDecoder()
+    let timestampLength = 9
+    let byteCountLength = 2
+
+    var result: [Timestamped<T>] = []
+    var currentIndex = data.startIndex
+    var skippedValues = 0
+    while currentIndex < data.endIndex {
+        let startIndexOfTimestamp = currentIndex + byteCountLength
+        guard startIndexOfTimestamp <= data.endIndex else {
+            print("File \(file): Only \(data.endIndex - currentIndex) bytes, needed \(byteCountLength) for byte count")
+            throw MetricError.logFileCorrupted
+        }
+        guard let byteCount = UInt16(fromData: data[currentIndex..<startIndexOfTimestamp]) else {
+            print("File \(file): Invalid byte count")
+            throw MetricError.logFileCorrupted
+        }
+        let nextIndex = startIndexOfTimestamp + Int(byteCount)
+        guard nextIndex <= data.endIndex else {
+            print("File \(file): Needed \(byteCountLength + Int(byteCount)) for timestamped value, has \(data.endIndex - startIndexOfTimestamp)")
+            throw MetricError.logFileCorrupted
+        }
+        guard byteCount >= timestampLength else {
+            print("File \(file): Only \(byteCount) bytes, needed \(timestampLength) for timestamp")
+            throw MetricError.logFileCorrupted
+        }
+        let timestampData = data[startIndexOfTimestamp..<startIndexOfTimestamp+timestampLength]
+        let timestamp = try decoder.decode(Double.self, from: timestampData)
+        let date = Date(timeIntervalSince1970: timestamp)
+        let elementData = data[startIndexOfTimestamp+timestampLength..<nextIndex]
+        do {
+            let element: T = try decoder.decode(from: elementData)
+            result.append(.init(value: element, timestamp: date))
+        } catch {
+            skippedValues += 1
+        }
+        currentIndex = nextIndex
+        if result.count % 100 == 1 {
+            print("File \(file): \(result.count) entries loaded (\(currentIndex)/\(data.endIndex) bytes)")
+        }
+    }
+    print("Loaded \(result.count) data points (\(skippedValues) skipped)")
+    return result
+}
+
+extension UInt16 {
+
+    func toData() -> Data {
+        Data([UInt8(self >> 8 & 0xFF), UInt8(self & 0xFF)])
+    }
+
+    init?<T: DataProtocol>(fromData data: T) {
+        guard data.count == 2 else {
+            return nil
+        }
+        let bytes = Array(data)
+        self = UInt16(UInt32(bytes[0]) << 8 | UInt32(bytes[1]))
     }
 }

Sources/Run/main.swift

@@ -6,6 +6,13 @@ try LoggingSystem.bootstrap(from: &env)
 let app = Application(env)
 defer { app.shutdown() }
 
+let storageFolder = URL(fileURLWithPath: app.directory.resourcesDirectory)
+let logFolder = storageFolder.appendingPathComponent("logs")
+print("Starting migration")
+try migrate(folder: logFolder)
+print("Finished migration")
+/*
+ 
 private let semaphore = DispatchSemaphore(value: 0)
 Task {
     try await configure(app)
@@ -13,3 +20,4 @@ Task {
 }
 semaphore.wait()
 try app.run()
+*/