d19af3aba8
[ADDED] Debugging with DCIntrospect and Reveal. [REMOVED] A bunch of google+ files that are no longer necessary. [FIXED] Type and formatting fixes for 64-bit platform types. [UPDATED] Production logging of what StoreManager is doing to help people with trouble out. [ADDED] Log reason for ubiquity error to checkpoint.
505 lines
20 KiB
Objective-C
505 lines
20 KiB
Objective-C
//
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// GTMLogger.h
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//
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// Copyright 2007-2008 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy
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// of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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//
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// Key Abstractions
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// ----------------
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//
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// This file declares multiple classes and protocols that are used by the
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// GTMLogger logging system. The 4 main abstractions used in this file are the
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// following:
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//
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// * logger (GTMLogger) - The main logging class that users interact with. It
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// has methods for logging at different levels and uses a log writer, a log
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// formatter, and a log filter to get the job done.
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//
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// * log writer (GTMLogWriter) - Writes a given string to some log file, where
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// a "log file" can be a physical file on disk, a POST over HTTP to some URL,
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// or even some in-memory structure (e.g., a ring buffer).
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//
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// * log formatter (GTMLogFormatter) - Given a format string and arguments as
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// a va_list, returns a single formatted NSString. A "formatted string" could
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// be a string with the date prepended, a string with values in a CSV format,
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// or even a string of XML.
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//
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// * log filter (GTMLogFilter) - Given a formatted log message as an NSString
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// and the level at which the message is to be logged, this class will decide
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// whether the given message should be logged or not. This is a flexible way
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// to filter out messages logged at a certain level, messages that contain
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// certain text, or filter nothing out at all. This gives the caller the
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// flexibility to dynamically enable debug logging in Release builds.
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//
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// This file also declares some classes to handle the common log writer, log
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// formatter, and log filter cases. Callers can also create their own writers,
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// formatters, and filters and they can even build them on top of the ones
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// declared here. Keep in mind that your custom writer/formatter/filter may be
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// called from multiple threads, so it must be thread-safe.
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#import <Foundation/Foundation.h>
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#import "GTMDefines.h"
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// Predeclaration of used protocols that are declared later in this file.
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@protocol GTMLogWriter, GTMLogFormatter, GTMLogFilter;
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// GTMLogger
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//
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// GTMLogger is the primary user-facing class for an object-oriented logging
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// system. It is built on the concept of log formatters (GTMLogFormatter), log
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// writers (GTMLogWriter), and log filters (GTMLogFilter). When a message is
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// sent to a GTMLogger to log a message, the message is formatted using the log
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// formatter, then the log filter is consulted to see if the message should be
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// logged, and if so, the message is sent to the log writer to be written out.
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//
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// GTMLogger is intended to be a flexible and thread-safe logging solution. Its
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// flexibility comes from the fact that GTMLogger instances can be customized
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// with user defined formatters, filters, and writers. And these writers,
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// filters, and formatters can be combined, stacked, and customized in arbitrary
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// ways to suit the needs at hand. For example, multiple writers can be used at
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// the same time, and a GTMLogger instance can even be used as another
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// GTMLogger's writer. This allows for arbitrarily deep logging trees.
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//
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// A standard GTMLogger uses a writer that sends messages to standard out, a
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// formatter that smacks a timestamp and a few other bits of interesting
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// information on the message, and a filter that filters out debug messages from
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// release builds. Using the standard log settings, a log message will look like
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// the following:
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//
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// 2007-12-30 10:29:24.177 myapp[4588/0xa07d0f60] [lvl=1] foo=<Foo: 0x123>
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//
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// The output contains the date and time of the log message, the name of the
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// process followed by its process ID/thread ID, the log level at which the
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// message was logged (in the previous example the level was 1:
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// kGTMLoggerLevelDebug), and finally, the user-specified log message itself (in
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// this case, the log message was @"foo=%@", foo).
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//
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// Multiple instances of GTMLogger can be created, each configured their own
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// way. Though GTMLogger is not a singleton (in the GoF sense), it does provide
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// access to a shared (i.e., globally accessible) GTMLogger instance. This makes
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// it convenient for all code in a process to use the same GTMLogger instance.
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// The shared GTMLogger instance can also be configured in an arbitrary, and
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// these configuration changes will affect all code that logs through the shared
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// instance.
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//
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// Log Levels
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// ----------
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// GTMLogger has 3 different log levels: Debug, Info, and Error. GTMLogger
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// doesn't take any special action based on the log level; it simply forwards
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// this information on to formatters, filters, and writers, each of which may
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// optionally take action based on the level. Since log level filtering is
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// performed at runtime, log messages are typically not filtered out at compile
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// time. The exception to this rule is that calls to the GTMLoggerDebug() macro
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// *ARE* filtered out of non-DEBUG builds. This is to be backwards compatible
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// with behavior that many developers are currently used to. Note that this
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// means that GTMLoggerDebug(@"hi") will be compiled out of Release builds, but
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// [[GTMLogger sharedLogger] logDebug:@"hi"] will NOT be compiled out.
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//
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// Standard loggers are created with the GTMLogLevelFilter log filter, which
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// filters out certain log messages based on log level, and some other settings.
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//
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// In addition to the -logDebug:, -logInfo:, and -logError: methods defined on
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// GTMLogger itself, there are also C macros that make usage of the shared
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// GTMLogger instance very convenient. These macros are:
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//
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// GTMLoggerDebug(...)
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// GTMLoggerInfo(...)
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// GTMLoggerError(...)
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//
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// Again, a notable feature of these macros is that GTMLogDebug() calls *will be
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// compiled out of non-DEBUG builds*.
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//
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// Standard Loggers
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// ----------------
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// GTMLogger has the concept of "standard loggers". A standard logger is simply
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// a logger that is pre-configured with some standard/common writer, formatter,
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// and filter combination. Standard loggers are created using the creation
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// methods beginning with "standard". The alternative to a standard logger is a
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// regular logger, which will send messages to stdout, with no special
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// formatting, and no filtering.
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//
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// How do I use GTMLogger?
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// ----------------------
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// The typical way you will want to use GTMLogger is to simply use the
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// GTMLogger*() macros for logging from code. That way we can easily make
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// changes to the GTMLogger class and simply update the macros accordingly. Only
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// your application startup code (perhaps, somewhere in main()) should use the
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// GTMLogger class directly in order to configure the shared logger, which all
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// of the code using the macros will be using. Again, this is just the typical
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// situation.
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//
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// To be complete, there are cases where you may want to use GTMLogger directly,
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// or even create separate GTMLogger instances for some reason. That's fine,
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// too.
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//
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// Examples
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// --------
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// The following show some common GTMLogger use cases.
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//
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// 1. You want to log something as simply as possible. Also, this call will only
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// appear in debug builds. In non-DEBUG builds it will be completely removed.
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//
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// GTMLoggerDebug(@"foo = %@", foo);
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//
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// 2. The previous example is similar to the following. The major difference is
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// that the previous call (example 1) will be compiled out of Release builds
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// but this statement will not be compiled out.
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//
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// [[GTMLogger sharedLogger] logDebug:@"foo = %@", foo];
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//
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// 3. Send all logging output from the shared logger to a file. We do this by
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// creating an NSFileHandle for writing associated with a file, and setting
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// that file handle as the logger's writer.
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//
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// NSFileHandle *f = [NSFileHandle fileHandleForWritingAtPath:@"/tmp/f.log"
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// create:YES];
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// [[GTMLogger sharedLogger] setWriter:f];
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// GTMLoggerError(@"hi"); // This will be sent to /tmp/f.log
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//
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// 4. Create a new GTMLogger that will log to a file. This example differs from
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// the previous one because here we create a new GTMLogger that is different
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// from the shared logger.
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//
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// GTMLogger *logger = [GTMLogger standardLoggerWithPath:@"/tmp/temp.log"];
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// [logger logInfo:@"hi temp log file"];
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//
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// 5. Create a logger that writes to stdout and does NOT do any formatting to
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// the log message. This might be useful, for example, when writing a help
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// screen for a command-line tool to standard output.
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//
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// GTMLogger *logger = [GTMLogger logger];
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// [logger logInfo:@"%@ version 0.1 usage", progName];
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//
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// 6. Send log output to stdout AND to a log file. The trick here is that
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// NSArrays function as composite log writers, which means when an array is
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// set as the log writer, it forwards all logging messages to all of its
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// contained GTMLogWriters.
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//
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// // Create array of GTMLogWriters
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// NSArray *writers = [NSArray arrayWithObjects:
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// [NSFileHandle fileHandleForWritingAtPath:@"/tmp/f.log" create:YES],
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// [NSFileHandle fileHandleWithStandardOutput], nil];
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//
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// GTMLogger *logger = [GTMLogger standardLogger];
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// [logger setWriter:writers];
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// [logger logInfo:@"hi"]; // Output goes to stdout and /tmp/f.log
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//
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// For futher details on log writers, formatters, and filters, see the
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// documentation below.
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//
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// NOTE: GTMLogger is application level logging. By default it does nothing
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// with _GTMDevLog/_GTMDevAssert (see GTMDefines.h). An application can choose
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// to bridge _GTMDevLog/_GTMDevAssert to GTMLogger by providing macro
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// definitions in its prefix header (see GTMDefines.h for how one would do
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// that).
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//
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@interface GTMLogger : NSObject {
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@private
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id<GTMLogWriter> writer_;
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id<GTMLogFormatter> formatter_;
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id<GTMLogFilter> filter_;
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}
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//
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// Accessors for the shared logger instance
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//
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// Returns a shared/global standard GTMLogger instance. Callers should typically
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// use this method to get a GTMLogger instance, unless they explicitly want
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// their own instance to configure for their own needs. This is the only method
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// that returns a shared instance; all the rest return new GTMLogger instances.
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+ (id)sharedLogger;
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// Sets the shared logger instance to |logger|. Future calls to +sharedLogger
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// will return |logger| instead.
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+ (void)setSharedLogger:(GTMLogger *)logger;
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//
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// Creation methods
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//
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// Returns a new autoreleased GTMLogger instance that will log to stdout, using
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// the GTMLogStandardFormatter, and the GTMLogLevelFilter filter.
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+ (id)standardLogger;
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// Same as +standardLogger, but logs to stderr.
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+ (id)standardLoggerWithStderr;
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// Same as +standardLogger but levels >= kGTMLoggerLevelError are routed to
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// stderr, everything else goes to stdout.
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+ (id)standardLoggerWithStdoutAndStderr;
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// Returns a new standard GTMLogger instance with a log writer that will
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// write to the file at |path|, and will use the GTMLogStandardFormatter and
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// GTMLogLevelFilter classes. If |path| does not exist, it will be created.
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+ (id)standardLoggerWithPath:(NSString *)path;
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// Returns an autoreleased GTMLogger instance that will use the specified
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// |writer|, |formatter|, and |filter|.
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+ (id)loggerWithWriter:(id<GTMLogWriter>)writer
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formatter:(id<GTMLogFormatter>)formatter
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filter:(id<GTMLogFilter>)filter;
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// Returns an autoreleased GTMLogger instance that logs to stdout, with the
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// basic formatter, and no filter. The returned logger differs from the logger
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// returned by +standardLogger because this one does not do any filtering and
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// does not do any special log formatting; this is the difference between a
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// "regular" logger and a "standard" logger.
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+ (id)logger;
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// Designated initializer. This method returns a GTMLogger initialized with the
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// specified |writer|, |formatter|, and |filter|. See the setter methods below
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// for what values will be used if nil is passed for a parameter.
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- (id)initWithWriter:(id<GTMLogWriter>)writer
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formatter:(id<GTMLogFormatter>)formatter
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filter:(id<GTMLogFilter>)filter;
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//
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// Logging methods
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//
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// Logs a message at the debug level (kGTMLoggerLevelDebug).
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- (void)logDebug:(NSString *)fmt, ... NS_FORMAT_FUNCTION(1, 2);
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// Logs a message at the info level (kGTMLoggerLevelInfo).
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- (void)logInfo:(NSString *)fmt, ... NS_FORMAT_FUNCTION(1, 2);
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// Logs a message at the error level (kGTMLoggerLevelError).
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- (void)logError:(NSString *)fmt, ... NS_FORMAT_FUNCTION(1, 2);
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// Logs a message at the assert level (kGTMLoggerLevelAssert).
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- (void)logAssert:(NSString *)fmt, ... NS_FORMAT_FUNCTION(1, 2);
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//
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// Accessors
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//
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// Accessor methods for the log writer. If the log writer is set to nil,
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// [NSFileHandle fileHandleWithStandardOutput] is used.
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- (id<GTMLogWriter>)writer;
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- (void)setWriter:(id<GTMLogWriter>)writer;
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// Accessor methods for the log formatter. If the log formatter is set to nil,
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// GTMLogBasicFormatter is used. This formatter will format log messages in a
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// plain printf style.
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- (id<GTMLogFormatter>)formatter;
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- (void)setFormatter:(id<GTMLogFormatter>)formatter;
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// Accessor methods for the log filter. If the log filter is set to nil,
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// GTMLogNoFilter is used, which allows all log messages through.
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- (id<GTMLogFilter>)filter;
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- (void)setFilter:(id<GTMLogFilter>)filter;
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@end // GTMLogger
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// Helper functions that are used by the convenience GTMLogger*() macros that
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// enable the logging of function names.
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@interface GTMLogger (GTMLoggerMacroHelpers)
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- (void)logFuncDebug:(const char *)func msg:(NSString *)fmt, ...
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NS_FORMAT_FUNCTION(2, 3);
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- (void)logFuncInfo:(const char *)func msg:(NSString *)fmt, ...
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NS_FORMAT_FUNCTION(2, 3);
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- (void)logFuncError:(const char *)func msg:(NSString *)fmt, ...
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NS_FORMAT_FUNCTION(2, 3);
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- (void)logFuncAssert:(const char *)func msg:(NSString *)fmt, ...
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NS_FORMAT_FUNCTION(2, 3);
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@end // GTMLoggerMacroHelpers
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// The convenience macros are only defined if they haven't already been defined.
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#ifndef GTMLoggerInfo
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// Convenience macros that log to the shared GTMLogger instance. These macros
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// are how users should typically log to GTMLogger. Notice that GTMLoggerDebug()
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// calls will be compiled out of non-Debug builds.
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#define GTMLoggerDebug(...) \
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[[GTMLogger sharedLogger] logFuncDebug:__func__ msg:__VA_ARGS__]
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#define GTMLoggerInfo(...) \
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[[GTMLogger sharedLogger] logFuncInfo:__func__ msg:__VA_ARGS__]
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#define GTMLoggerError(...) \
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[[GTMLogger sharedLogger] logFuncError:__func__ msg:__VA_ARGS__]
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#define GTMLoggerAssert(...) \
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[[GTMLogger sharedLogger] logFuncAssert:__func__ msg:__VA_ARGS__]
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// If we're not in a debug build, remove the GTMLoggerDebug statements. This
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// makes calls to GTMLoggerDebug "compile out" of Release builds
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#ifndef DEBUG
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#undef GTMLoggerDebug
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#define GTMLoggerDebug(...) do {} while(0)
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#endif
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#endif // !defined(GTMLoggerInfo)
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// Log levels.
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typedef enum {
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kGTMLoggerLevelUnknown,
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kGTMLoggerLevelDebug,
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kGTMLoggerLevelInfo,
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kGTMLoggerLevelError,
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kGTMLoggerLevelAssert,
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} GTMLoggerLevel;
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//
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// Log Writers
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//
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// Protocol to be implemented by a GTMLogWriter instance.
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@protocol GTMLogWriter <NSObject>
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// Writes the given log message to where the log writer is configured to write.
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- (void)logMessage:(NSString *)msg level:(GTMLoggerLevel)level;
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@end // GTMLogWriter
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// Simple category on NSFileHandle that makes NSFileHandles valid log writers.
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// This is convenient because something like, say, +fileHandleWithStandardError
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// now becomes a valid log writer. Log messages are written to the file handle
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// with a newline appended.
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@interface NSFileHandle (GTMFileHandleLogWriter) <GTMLogWriter>
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// Opens the file at |path| in append mode, and creates the file with |mode|
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// if it didn't previously exist.
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+ (id)fileHandleForLoggingAtPath:(NSString *)path mode:(mode_t)mode;
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@end // NSFileHandle
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// This category makes NSArray a GTMLogWriter that can be composed of other
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// GTMLogWriters. This is the classic Composite GoF design pattern. When the
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// GTMLogWriter -logMessage:level: message is sent to the array, the array
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// forwards the message to all of its elements that implement the GTMLogWriter
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// protocol.
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//
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// This is useful in situations where you would like to send log output to
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// multiple log writers at the same time. Simply create an NSArray of the log
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// writers you wish to use, then set the array as the "writer" for your
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// GTMLogger instance.
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@interface NSArray (GTMArrayCompositeLogWriter) <GTMLogWriter>
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@end // GTMArrayCompositeLogWriter
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// This category adapts the GTMLogger interface so that it can be used as a log
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// writer; it's an "adapter" in the GoF Adapter pattern sense.
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//
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// This is useful when you want to configure a logger to log to a specific
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// writer with a specific formatter and/or filter. But you want to also compose
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// that with a different log writer that may have its own formatter and/or
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// filter.
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@interface GTMLogger (GTMLoggerLogWriter) <GTMLogWriter>
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@end // GTMLoggerLogWriter
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//
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// Log Formatters
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//
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// Protocol to be implemented by a GTMLogFormatter instance.
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@protocol GTMLogFormatter <NSObject>
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// Returns a formatted string using the format specified in |fmt| and the va
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// args specified in |args|.
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- (NSString *)stringForFunc:(NSString *)func
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withFormat:(NSString *)fmt
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valist:(va_list)args
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level:(GTMLoggerLevel)level NS_FORMAT_FUNCTION(2, 0);
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@end // GTMLogFormatter
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// A basic log formatter that formats a string the same way that NSLog (or
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// printf) would. It does not do anything fancy, nor does it add any data of its
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// own.
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@interface GTMLogBasicFormatter : NSObject <GTMLogFormatter>
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// Helper method for prettying C99 __func__ and GCC __PRETTY_FUNCTION__
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- (NSString *)prettyNameForFunc:(NSString *)func;
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@end // GTMLogBasicFormatter
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// A log formatter that formats the log string like the basic formatter, but
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// also prepends a timestamp and some basic process info to the message, as
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// shown in the following sample output.
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// 2007-12-30 10:29:24.177 myapp[4588/0xa07d0f60] [lvl=1] log mesage here
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@interface GTMLogStandardFormatter : GTMLogBasicFormatter {
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@private
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NSDateFormatter *dateFormatter_; // yyyy-MM-dd HH:mm:ss.SSS
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NSString *pname_;
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pid_t pid_;
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}
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@end // GTMLogStandardFormatter
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//
|
|
// Log Filters
|
|
//
|
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|
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// Protocol to be imlemented by a GTMLogFilter instance.
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|
@protocol GTMLogFilter <NSObject>
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// Returns YES if |msg| at |level| should be filtered out; NO otherwise.
|
|
- (BOOL)filterAllowsMessage:(NSString *)msg level:(GTMLoggerLevel)level;
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@end // GTMLogFilter
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|
|
// A log filter that filters messages at the kGTMLoggerLevelDebug level out of
|
|
// non-debug builds. Messages at the kGTMLoggerLevelInfo level are also filtered
|
|
// out of non-debug builds unless GTMVerboseLogging is set in the environment or
|
|
// the processes's defaults. Messages at the kGTMLoggerLevelError level are
|
|
// never filtered.
|
|
@interface GTMLogLevelFilter : NSObject <GTMLogFilter>
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|
@end // GTMLogLevelFilter
|
|
|
|
// A simple log filter that does NOT filter anything out;
|
|
// -filterAllowsMessage:level will always return YES. This can be a convenient
|
|
// way to enable debug-level logging in release builds (if you so desire).
|
|
@interface GTMLogNoFilter : NSObject <GTMLogFilter>
|
|
@end // GTMLogNoFilter
|
|
|
|
|
|
// Base class for custom level filters. Not for direct use, use the minimum
|
|
// or maximum level subclasses below.
|
|
@interface GTMLogAllowedLevelFilter : NSObject <GTMLogFilter> {
|
|
@private
|
|
NSIndexSet *allowedLevels_;
|
|
}
|
|
@end
|
|
|
|
// A log filter that allows you to set a minimum log level. Messages below this
|
|
// level will be filtered.
|
|
@interface GTMLogMininumLevelFilter : GTMLogAllowedLevelFilter
|
|
|
|
// Designated initializer, logs at levels < |level| will be filtered.
|
|
- (id)initWithMinimumLevel:(GTMLoggerLevel)level;
|
|
|
|
@end
|
|
|
|
// A log filter that allows you to set a maximum log level. Messages whose level
|
|
// exceeds this level will be filtered. This is really only useful if you have
|
|
// a composite GTMLogger that is sending the other messages elsewhere.
|
|
@interface GTMLogMaximumLevelFilter : GTMLogAllowedLevelFilter
|
|
|
|
// Designated initializer, logs at levels > |level| will be filtered.
|
|
- (id)initWithMaximumLevel:(GTMLoggerLevel)level;
|
|
|
|
@end
|
|
|
|
|
|
// For subclasses only
|
|
@interface GTMLogger (PrivateMethods)
|
|
|
|
- (void)logInternalFunc:(const char *)func
|
|
format:(NSString *)fmt
|
|
valist:(va_list)args
|
|
level:(GTMLoggerLevel)level NS_FORMAT_FUNCTION(2, 0);
|
|
|
|
@end
|
|
|