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Jelle Vandebeeck
December 21, 2018
Technology
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1.7k
Unified Logging
Jelle Vandebeeck
December 21, 2018
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Transcript
UNIFIED LOGGING JELLE VANDEBEECK / ICAPPS 1
Why? ๏ Improved debugging during development ๏ Track down crashes
in asynchronous code ๏ Improved privacy JELLE VANDEBEECK / ICAPPS 2
Legacy NSLog(@"Hello!") asl_log_message syslog JELLE VANDEBEECK / ICAPPS 3
Legacy ๏ Visible in Xcode ๏ Visible in the Console.app
application JELLE VANDEBEECK / ICAPPS 4
Swift print("Hello!") ๏ Visible in Xcode ๏ Not visible in
the Console.app application JELLE VANDEBEECK / ICAPPS 5
New API Exists since iOS 10... ! JELLE VANDEBEECK /
ICAPPS 6
os_log import os os_log(.debug, "Hello") os_log(.info, "Hello") os_log(.default, "Hello") os_log(.error,
"Hello") os_log(.fault, "Hello") JELLE VANDEBEECK / ICAPPS 7
Logging Levels Level Enabled Initially stored On bu!er full Debug
! ! ! Info ✅ Memory ! 1 Default ✅ Memory Disk Error ✅ Disk Disk Fault ✅ Disk Disk 1 Except when an error occurs JELLE VANDEBEECK / ICAPPS 8
To disk ๏ You can find a .tracev3 file that
contains the logs inside of /var/db/diagnostics. ๏ Data stores instead of text-based files. ๏ When date storage is exceeded oldest messages are purged JELLE VANDEBEECK / ICAPPS 9
Usage ๏ Level: Debug ๏ High volume debugging during development
๏ Console.app: ⚫ JELLE VANDEBEECK / ICAPPS 10
Usage ๏ Level: Info ๏ Additional info that will be
captured during an error or faultent ๏ Console.app: ⚪ JELLE VANDEBEECK / ICAPPS 11
Usage ๏ Level: Default ๏ Log critical details to help
debug issues ๏ Console.app: N/A JELLE VANDEBEECK / ICAPPS 12
Usage ๏ Level: Error ๏ Additional information capture from the
app ๏ Console.app: ! JELLE VANDEBEECK / ICAPPS 13
Usage ๏ Level: Fault ๏ Additional information capture from the
system ๏ Console.app: ! JELLE VANDEBEECK / ICAPPS 14
Subsystem & Category let logger = OSLog(subsystem: "com.icapps.logging", category: "Monkey")
os_log("Hello ! ", log: logger) JELLE VANDEBEECK / ICAPPS 15
Privacy ๏ Prevents accidental leak of Personally Identifiable Information ๏
Replaces dynamic strings, collections, arrays with a <private> keyword JELLE VANDEBEECK / ICAPPS 16
Privacy ๏ Primitive types are public by default, but can
be made private with the <public> keyword JELLE VANDEBEECK / ICAPPS 17
Privacy let name: String = "Jake" os_log("Hi \(name)") // !
os_log("Hi %@", name) // Hi <private> os_log("Hi %{public}@", name) // Hi Jake os_log("Hi %{private}d", someNumber) // Hi <private> JELLE VANDEBEECK / ICAPPS 18
Formatters os_log("Time: %{time_t}d", timeInterval) // 2016-01-12 19:41:37 os_log("UUID: %{uuid_t}.16P", uuid)
// 2F6B8A25-A539-4320-A416-83649B8D50BC os_log("IPv4: %{network:in_addr}.16P", address) // 17.43.23.87 JELLE VANDEBEECK / ICAPPS 19
DEMO ! JELLE VANDEBEECK / ICAPPS 20
Overview ๏ Automatic formatting ๏ Automatic collecting file / function
/ line information ๏ Huge performance improvement compared to NSLog JELLE VANDEBEECK / ICAPPS 21
Overview ๏ Improved security ๏ Improved filtertering in the Console.app
JELLE VANDEBEECK / ICAPPS 22
Best practices ๏ Keep the logs compact ๏ Use the
formatters provided by Apple ๏ Don't wrap os_log in other functions ๏ Avoid dictionaries or arrays JELLE VANDEBEECK / ICAPPS 23
Activities JELLE VANDEBEECK / ICAPPS 24
Activities ๏ What happens in async code ๏ Track down
crashes ๏ Shows a clean trace in the Console.app JELLE VANDEBEECK / ICAPPS 25
Activities os_activity_create(...) ๏ Creates an activity ๏ Can be added
to the current activity with OS_ACTIVITY_CURRENT JELLE VANDEBEECK / ICAPPS 26
Scope if(...) { os_activity_scope(...) os_log(...) } JELLE VANDEBEECK / ICAPPS
27
Apply os_activity_apply(activity, ^{ os_log(...) }) JELLE VANDEBEECK / ICAPPS 28
Activity in Swift Should be bridged from Obj-C 2 !
2 Luckely someone create a wrapper that can easily be used in Swift JELLE VANDEBEECK / ICAPPS 29
DEMO ! JELLE VANDEBEECK / ICAPPS 30
References ๏ WWDC 2016 Session ๏ Bridged Activity Gist ๏
Unified Logging and Activity Tracing ๏ Activity Tracing JELLE VANDEBEECK / ICAPPS 31