fix: 4.0-RC1问题修复：logView解析+进入Transaction等页面白屏

Author: mgsky1

cat-core/src/main/java/com/dianping/cat/report/service/BaseRemoteModelService.java

@@ -91,9 +91,8 @@ public ModelResponse<T> invoke(ModelRequest request) {
 
 			t.addData(url.toString());
 
-			InputStream in = Urls.forIO().connectTimeout(1000).readTimeout(10000).openStream(url.toExternalForm());
-			GZIPInputStream gzip = new GZIPInputStream(in);
-			String xml = Files.forIO().readFrom(gzip, "utf-8");
+			InputStream in = Urls.forIO().connectTimeout(1000).readTimeout(10000).withGzip().openStream(url.toExternalForm());
+			String xml = Files.forIO().readFrom(in, "utf-8");
 
 			int len = xml == null ? 0 : xml.length();
 

cat-home/src/main/java/com/dianping/cat/report/page/logview/service/LocalMessageService.java

@@ -88,7 +88,7 @@ private String buildNewReport(ModelRequest request, ModelPeriod period, String d
 		MessageTree tree = null;
 
 		if (buf != null) {
-			tree = CodecHandler.decode(buf);
+			tree = CodecHandler.decode(changeBuf(buf));
 		}
 
 		if (tree == null) {
@@ -101,7 +101,7 @@ private String buildNewReport(ModelRequest request, ModelPeriod period, String d
 				ByteBuf data = bucket.get(id);
 
 				if (data != null) {
-					tree = CodecHandler.decode(data);
+					tree = CodecHandler.decode(changeBuf(data));
 				}
 			}
 		}
@@ -126,6 +126,17 @@ private String buildNewReport(ModelRequest request, ModelPeriod period, String d
 		return null;
 	}
 
+	private ByteBuf changeBuf(ByteBuf data) {
+		data.markReaderIndex();
+		int length = data.readInt();
+		data.resetReaderIndex();
+		ByteBuf readBytes = data.readBytes(length + 4);
+
+		readBytes.markReaderIndex();
+		readBytes.readInt();
+		return readBytes;
+	}
+
 	public String buildOldReport(ModelRequest request, ModelPeriod period, String domain, ApiPayload payload)
 	      throws Exception {
 		String messageId = payload.getMessageId();

cat-home/src/main/java/com/dianping/cat/report/page/logview/service/RemoteLogViewService.java

@@ -59,9 +59,8 @@ public ModelResponse<String> invoke(ModelRequest request) {
 
 			t.addData(url.toString());
 
-			InputStream in = Urls.forIO().connectTimeout(1000).readTimeout(5000).openStream(url.toExternalForm());
-			GZIPInputStream gzip = new GZIPInputStream(in);
-			String xml = Files.forIO().readFrom(gzip, "utf-8");
+			InputStream in = Urls.forIO().connectTimeout(1000).readTimeout(5000).withGzip().openStream(url.toExternalForm());
+			String xml = Files.forIO().readFrom(in, "utf-8");
 
 			int len = xml == null ? 0 : xml.length();