AppRTCDemo file logging.

Adds logging macros to log logs to a file. Undeletes CircularFileStream
for that purpose.

BUG=
R=jiayl@webrtc.org, pbos@webrtc.org

Review URL: https://codereview.webrtc.org/1217473011 .

Cr-Commit-Position: refs/heads/master@{#9582}
diff --git a/talk/examples/objc/AppRTCDemo/common/ARDLogging.h b/talk/examples/objc/AppRTCDemo/common/ARDLogging.h
new file mode 100644
index 0000000..dfb31d8
--- /dev/null
+++ b/talk/examples/objc/AppRTCDemo/common/ARDLogging.h
@@ -0,0 +1,88 @@
+/*
+ * libjingle
+ * Copyright 2015 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import <Foundation/Foundation.h>
+
+// We route all logging through the WebRTC logger. By doing this we will get
+// both app and WebRTC logs in the same place, which we can then route to a
+// file if we need to. A side effect of this is that we get severity for free.
+typedef NS_ENUM(NSInteger, ARDLogSeverity) {
+  kARDLogSeverityVerbose,
+  kARDLogSeverityInfo,
+  kARDLogSeverityWarning,
+  kARDLogSeverityError,
+};
+
+#if defined(__cplusplus)
+extern "C" void ARDLogToWebRTCLogger(ARDLogSeverity severity,
+                                     NSString *logString);
+extern "C" NSString *ARDFileName(const char *filePath);
+extern "C" void ARDLogInit();
+#else
+// Logs |logString| to the WebRTC logger at the given severity.
+extern void ARDLogToWebRTCLogger(ARDLogSeverity severity, NSString *logString);
+// Returns the filename with the path prefix removed.
+extern NSString *ARDFileName(const char *filePath);
+// Initializes the correct logging levels. This should be called once on app
+// startup.
+extern void ARDLogInit();
+#endif
+
+#define ARDLogString(format, ...)                    \
+  [NSString stringWithFormat:@"(%@:%d %s): " format, \
+      ARDFileName(__FILE__),                         \
+      __LINE__,                                      \
+      __FUNCTION__,                                  \
+      ##__VA_ARGS__]
+
+#define ARDLogEx(severity, format, ...)                        \
+  do {                                                         \
+    NSString *logString = ARDLogString(format, ##__VA_ARGS__); \
+    ARDLogToWebRTCLogger(severity, logString);                 \
+  } while (false)
+
+#define ARDLogVerbose(format, ...)                        \
+  ARDLogEx(kARDLogSeverityVerbose, format, ##__VA_ARGS__) \
+
+#define ARDLogInfo(format, ...)                           \
+  ARDLogEx(kARDLogSeverityInfo, format, ##__VA_ARGS__)    \
+
+#define ARDLogWarning(format, ...)                        \
+  ARDLogEx(kARDLogSeverityWarning, format, ##__VA_ARGS__) \
+
+#define ARDLogError(format, ...)                          \
+  ARDLogEx(kARDLogSeverityError, format, ##__VA_ARGS__)   \
+
+#ifdef _DEBUG
+#define ARDLogDebug(format, ...) ARDLogInfo(format, ##__VA_ARGS__)
+#else
+#define ARDLogDebug(format, ...) \
+  do {                           \
+  } while (false)
+#endif
+
+#define ARDLog(format, ...) ARDLogInfo(format, ##__VA_ARGS__)
diff --git a/talk/examples/objc/AppRTCDemo/common/ARDLogging.mm b/talk/examples/objc/AppRTCDemo/common/ARDLogging.mm
new file mode 100644
index 0000000..7bd773d
--- /dev/null
+++ b/talk/examples/objc/AppRTCDemo/common/ARDLogging.mm
@@ -0,0 +1,68 @@
+/*
+ * libjingle
+ * Copyright 2015 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import "ARDLogging.h"
+
+#include "webrtc/base/logging.h"
+
+void ARDLogInit() {
+#ifndef _DEBUG
+  // In debug builds the default level is LS_INFO and in non-debug builds it is
+  // disabled. Continue to log to console in non-debug builds, but only
+  // warnings and errors.
+  rtc::LogMessage::LogToDebug(rtc::LS_WARNING);
+#endif
+}
+
+void ARDLogToWebRTCLogger(ARDLogSeverity severity, NSString *logString) {
+  if (logString.length) {
+    const char* utf8String = logString.UTF8String;
+    switch (severity) {
+      case kARDLogSeverityVerbose:
+        LOG(LS_VERBOSE) << utf8String;
+        break;
+      case kARDLogSeverityInfo:
+        LOG(LS_INFO) << utf8String;
+        break;
+      case kARDLogSeverityWarning:
+        LOG(LS_WARNING) << utf8String;
+        break;
+      case kARDLogSeverityError:
+        LOG(LS_ERROR) << utf8String;
+        break;
+    }
+  }
+}
+
+NSString *ARDFileName(const char *filePath) {
+  NSString *nsFilePath =
+      [[NSString alloc] initWithBytesNoCopy:const_cast<char *>(filePath)
+                                     length:strlen(filePath)
+                                   encoding:NSUTF8StringEncoding
+                               freeWhenDone:NO];
+  return nsFilePath.lastPathComponent;
+}
diff --git a/talk/examples/objc/AppRTCDemo/common/ARDUtilities.h b/talk/examples/objc/AppRTCDemo/common/ARDUtilities.h
new file mode 100644
index 0000000..b0594e8
--- /dev/null
+++ b/talk/examples/objc/AppRTCDemo/common/ARDUtilities.h
@@ -0,0 +1,52 @@
+/*
+ * libjingle
+ * Copyright 2014 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import <Foundation/Foundation.h>
+
+@interface NSDictionary (ARDUtilites)
+
+// Creates a dictionary with the keys and values in the JSON object.
++ (NSDictionary *)dictionaryWithJSONString:(NSString *)jsonString;
++ (NSDictionary *)dictionaryWithJSONData:(NSData *)jsonData;
+
+@end
+
+@interface NSURLConnection (ARDUtilities)
+
+// Issues an asynchronous request that calls back on main queue.
++ (void)sendAsyncRequest:(NSURLRequest *)request
+       completionHandler:(void (^)(NSURLResponse *response,
+                                   NSData *data,
+                                   NSError *error))completionHandler;
+
+// Posts data to the specified URL.
++ (void)sendAsyncPostToURL:(NSURL *)url
+                  withData:(NSData *)data
+         completionHandler:(void (^)(BOOL succeeded,
+                                     NSData *data))completionHandler;
+
+@end
diff --git a/talk/examples/objc/AppRTCDemo/common/ARDUtilities.m b/talk/examples/objc/AppRTCDemo/common/ARDUtilities.m
new file mode 100644
index 0000000..066ee02
--- /dev/null
+++ b/talk/examples/objc/AppRTCDemo/common/ARDUtilities.m
@@ -0,0 +1,111 @@
+/*
+ * libjingle
+ * Copyright 2014 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import "ARDLogging.h"
+#import "ARDUtilities.h"
+
+@implementation NSDictionary (ARDUtilites)
+
++ (NSDictionary *)dictionaryWithJSONString:(NSString *)jsonString {
+  NSParameterAssert(jsonString.length > 0);
+  NSData *data = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
+  NSError *error = nil;
+  NSDictionary *dict =
+      [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];
+  if (error) {
+    ARDLog(@"Error parsing JSON: %@", error.localizedDescription);
+  }
+  return dict;
+}
+
++ (NSDictionary *)dictionaryWithJSONData:(NSData *)jsonData {
+  NSError *error = nil;
+  NSDictionary *dict =
+      [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error];
+  if (error) {
+    ARDLog(@"Error parsing JSON: %@", error.localizedDescription);
+  }
+  return dict;
+}
+
+@end
+
+@implementation NSURLConnection (ARDUtilities)
+
++ (void)sendAsyncRequest:(NSURLRequest *)request
+       completionHandler:(void (^)(NSURLResponse *response,
+                                   NSData *data,
+                                   NSError *error))completionHandler {
+  // Kick off an async request which will call back on main thread.
+  [NSURLConnection sendAsynchronousRequest:request
+                                     queue:[NSOperationQueue mainQueue]
+                         completionHandler:^(NSURLResponse *response,
+                                             NSData *data,
+                                             NSError *error) {
+    if (completionHandler) {
+      completionHandler(response, data, error);
+    }
+  }];
+}
+
+// Posts data to the specified URL.
++ (void)sendAsyncPostToURL:(NSURL *)url
+                  withData:(NSData *)data
+         completionHandler:(void (^)(BOOL succeeded,
+                                     NSData *data))completionHandler {
+  NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
+  request.HTTPMethod = @"POST";
+  request.HTTPBody = data;
+  [[self class] sendAsyncRequest:request
+                completionHandler:^(NSURLResponse *response,
+                                    NSData *data,
+                                    NSError *error) {
+    if (error) {
+      ARDLog(@"Error posting data: %@", error.localizedDescription);
+      if (completionHandler) {
+        completionHandler(NO, data);
+      }
+      return;
+    }
+    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;
+    if (httpResponse.statusCode != 200) {
+      NSString *serverResponse = data.length > 0 ?
+          [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] :
+          nil;
+      ARDLog(@"Received bad response: %@", serverResponse);
+      if (completionHandler) {
+        completionHandler(NO, data);
+      }
+      return;
+    }
+    if (completionHandler) {
+      completionHandler(YES, data);
+    }
+  }];
+}
+
+@end