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//
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// DDASLLogCapture.m
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// Lumberjack
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//
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// Created by Dario Ahdoot on 3/17/14.
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//
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//
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#import "DDASLLogCapture.h"
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#import "DDLog.h"
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#include <asl.h>
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#include <notify.h>
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#include <notify_keys.h>
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#include <sys/time.h>
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static BOOL _cancel = YES;
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static int _captureLogLevel = LOG_LEVEL_VERBOSE;
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@implementation DDASLLogCapture
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+ (void)start
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{
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// Ignore subsequent calls
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if (!_cancel)
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return;
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_cancel = NO;
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dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void)
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{
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[DDASLLogCapture captureAslLogs];
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});
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}
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+ (void)stop
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{
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_cancel = YES;
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}
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+ (int)captureLogLevel
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{
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return _captureLogLevel;
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}
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+ (void)setCaptureLogLevel:(int)LOG_LEVEL_XXX
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{
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_captureLogLevel = LOG_LEVEL_XXX;
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}
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# pragma mark - Private methods
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+ (void)configureAslQuery:(aslmsg)query
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{
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const char param[] = "7"; // ASL_LEVEL_DEBUG, which is everything. We'll rely on regular DDlog log level to filter
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asl_set_query(query, ASL_KEY_LEVEL, param, ASL_QUERY_OP_LESS_EQUAL | ASL_QUERY_OP_NUMERIC);
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#if !TARGET_OS_IPHONE || TARGET_IPHONE_SIMULATOR
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int processId = [[NSProcessInfo processInfo] processIdentifier];
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char pid[16];
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sprintf(pid, "%d", processId);
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asl_set_query(query, ASL_KEY_PID, pid, ASL_QUERY_OP_EQUAL | ASL_QUERY_OP_NUMERIC);
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#endif
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}
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+ (void)aslMessageRecieved:(aslmsg)msg
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{
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// NSString * sender = [NSString stringWithCString:asl_get(msg, ASL_KEY_SENDER) encoding:NSUTF8StringEncoding];
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NSString * message = [NSString stringWithCString:asl_get(msg, ASL_KEY_MSG) encoding:NSUTF8StringEncoding];
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NSString * level = [NSString stringWithCString:asl_get(msg, ASL_KEY_LEVEL) encoding:NSUTF8StringEncoding];
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NSString * secondsStr = [NSString stringWithCString:asl_get(msg, ASL_KEY_TIME) encoding:NSUTF8StringEncoding];
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NSString * nanoStr = [NSString stringWithCString:asl_get(msg, ASL_KEY_TIME_NSEC) encoding:NSUTF8StringEncoding];
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NSTimeInterval seconds = [secondsStr doubleValue];
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NSTimeInterval nanoSeconds = [nanoStr doubleValue];
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NSTimeInterval totalSeconds = seconds + (nanoSeconds / 1e9);
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NSDate * timeStamp = [NSDate dateWithTimeIntervalSince1970:totalSeconds];
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int flag;
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BOOL async;
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switch([level intValue])
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{
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// By default all NSLog's with a ASL_LEVEL_WARNING level
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case ASL_LEVEL_EMERG :
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case ASL_LEVEL_ALERT :
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case ASL_LEVEL_CRIT : flag = LOG_FLAG_ERROR; async = LOG_ASYNC_ERROR; break;
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case ASL_LEVEL_ERR : flag = LOG_FLAG_WARN; async = LOG_ASYNC_WARN; break;
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case ASL_LEVEL_WARNING : flag = LOG_FLAG_INFO; async = LOG_ASYNC_INFO; break;
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case ASL_LEVEL_NOTICE : flag = LOG_FLAG_DEBUG; async = LOG_ASYNC_DEBUG; break;
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case ASL_LEVEL_INFO :
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case ASL_LEVEL_DEBUG :
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default : flag = LOG_FLAG_VERBOSE; async = LOG_ASYNC_VERBOSE; break;
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}
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if (!(_captureLogLevel & flag))
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return;
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DDLogMessage * logMessage = [[DDLogMessage alloc]initWithLogMsg:message
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level:_captureLogLevel
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flag:flag
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context:0
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file:"DDASLLogCapture"
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function:0
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line:0
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tag:nil
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options:0
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timestamp:timeStamp];
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[DDLog log:async message:logMessage];
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}
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+ (void)captureAslLogs
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{
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@autoreleasepool
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{
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/*
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We use ASL_KEY_MSG_ID to see each message once, but there's no
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obvious way to get the "next" ID. To bootstrap the process, we'll
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search by timestamp until we've seen a message.
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*/
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struct timeval timeval = { .tv_sec = 0 };
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gettimeofday(&timeval, NULL);
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unsigned long long startTime = timeval.tv_sec;
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__block unsigned long long lastSeenID = 0;
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/*
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syslogd posts kNotifyASLDBUpdate (com.apple.system.logger.message)
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through the notify API when it saves messages to the ASL database.
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There is some coalescing - currently it is sent at most twice per
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second - but there is no documented guarantee about this. In any
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case, there may be multiple messages per notification.
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Notify notifications don't carry any payload, so we need to search
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for the messages.
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*/
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int notifyToken = 0; // Can be used to unregister with notify_cancel().
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notify_register_dispatch(kNotifyASLDBUpdate, ¬ifyToken, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^(int token)
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{
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// At least one message has been posted; build a search query.
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@autoreleasepool
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{
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aslmsg query = asl_new(ASL_TYPE_QUERY);
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char stringValue[64];
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if (lastSeenID > 0)
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{
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snprintf(stringValue, sizeof stringValue, "%llu", lastSeenID);
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asl_set_query(query, ASL_KEY_MSG_ID, stringValue, ASL_QUERY_OP_GREATER | ASL_QUERY_OP_NUMERIC);
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}
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else
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{
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snprintf(stringValue, sizeof stringValue, "%llu", startTime);
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asl_set_query(query, ASL_KEY_TIME, stringValue, ASL_QUERY_OP_GREATER_EQUAL | ASL_QUERY_OP_NUMERIC);
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}
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[DDASLLogCapture configureAslQuery:query];
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// Iterate over new messages.
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aslmsg msg;
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aslresponse response = asl_search(NULL, query);
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#if defined(__IPHONE_8_0) || defined(__MAC_10_10)
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while ((msg = asl_next(response)))
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#else
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while ((msg = aslresponse_next(response)))
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#endif
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{
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[DDASLLogCapture aslMessageRecieved:msg];
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// Keep track of which messages we've seen.
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lastSeenID = atoll(asl_get(msg, ASL_KEY_MSG_ID));
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}
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#if defined(__IPHONE_8_0) || defined(__MAC_10_10)
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asl_release(response);
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#else
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aslresponse_free(response);
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#endif
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if(_cancel)
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{
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notify_cancel(notifyToken);
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return;
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}
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free(query);
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}
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});
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}
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}
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@end
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