performance testing for client creation

Sources/XMTPiOS/Client.swift

@@ -149,18 +149,22 @@ public final class Client {
 		)
 	}
 
-	public static func build(address: String, options: ClientOptions)
+	public static func build(address: String, options: ClientOptions, inboxId: String? = nil)
 		async throws -> Client
 	{
 		let accountAddress = address.lowercased()
-		let inboxId = try await getOrCreateInboxId(
-			api: options.api, address: accountAddress)
-
+		let resolvedInboxId: String
+		if let existingInboxId = inboxId {
+			resolvedInboxId = existingInboxId
+		} else {
+			resolvedInboxId = try await getOrCreateInboxId(api: options.api, address: accountAddress)
+		}
+
 		return try await initializeClient(
 			accountAddress: accountAddress,
 			options: options,
 			signingKey: nil,
-			inboxId: inboxId
+			inboxId: resolvedInboxId
 		)
 	}
 

Tests/XMTPTests/ClientTests.swift

@@ -460,5 +460,59 @@ class ClientTests: XCTestCase {
 				installationId: alixInstallationId
 			))
 	}
+
+	func testCreatesADevClientPerformance() async throws {
+		let key = try Crypto.secureRandomBytes(count: 32)
+		let fakeWallet = try PrivateKey.generate()
+
+		// Measure time to create the client
+		let start = Date()
+		let client = try await Client.create(
+			account: fakeWallet,
+			options: ClientOptions(
+				api: ClientOptions.Api(env: .dev, isSecure: true),
+				dbEncryptionKey: key
+			)
+		)
+		let end = Date()
+		let time1 = end.timeIntervalSince(start)
+		print("PERF: Created a client in \(time1)s")
+
+		// Measure time to build a client
+		let start2 = Date()
+		let buildClient1 = try await Client.build(
+			address: fakeWallet.address,
+			options: ClientOptions(
+				api: ClientOptions.Api(env: .dev, isSecure: true),
+				dbEncryptionKey: key
+			)
+		)
+		let end2 = Date()
+		let time2 = end2.timeIntervalSince(start2)
+		print("PERF: Built a client in \(time2)s")
+
+		// Measure time to build a client with an inboxId
+		let start3 = Date()
+		let buildClient2 = try await Client.build(
+			address: fakeWallet.address,
+			options: ClientOptions(
+				api: ClientOptions.Api(env: .dev, isSecure: true),
+				dbEncryptionKey: key
+			),
+			inboxId: client.inboxID
+		)
+		let end3 = Date()
+		let time3 = end3.timeIntervalSince(start3)
+		print("PERF: Built a client with inboxId in \(time3)s")
+
+		// Assert performance comparisons
+		XCTAssertTrue(time2 < time1, "Building a client should be faster than creating one.")
+		XCTAssertTrue(time3 < time1, "Building a client with inboxId should be faster than creating one.")
+		XCTAssertTrue(time3 < time2, "Building a client with inboxId should be faster than building one without.")
+
+		// Assert that inbox IDs match
+		XCTAssertEqual(client.inboxID, buildClient1.inboxID, "Inbox ID of the created client and first built client should match.")
+		XCTAssertEqual(client.inboxID, buildClient2.inboxID, "Inbox ID of the created client and second built client should match.")
+	}
 
 }