com.google.walkaround.wave.server.rpc.ClientExceptionHandler.java Source code

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Here is the source code for com.google.walkaround.wave.server.rpc.ClientExceptionHandler.java

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/*
 * Copyright 2011 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.walkaround.wave.server.rpc;

import com.google.inject.Inject;
import com.google.walkaround.util.server.Util;
import com.google.walkaround.util.server.gwt.StackTraceDeobfuscator;
import com.google.walkaround.util.server.servlet.AbstractHandler;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author danilatos@google.com (Daniel Danilatos)
 */
public class ClientExceptionHandler extends AbstractHandler {

    /**
     * Represents an exception from the client.
     */
    private static class ClientException extends Exception {
        private static final long serialVersionUID = 276392586606896983L;

        private ClientException(String className, String message, StackTraceElement[] st, ClientException cause) {
            super("(" + className + ") " + message, cause);
            setStackTrace(st);
        }
    }

    @SuppressWarnings("unused")
    private static final Logger log = Logger.getLogger(ClientExceptionHandler.class.getName());

    private final StackTraceDeobfuscator deobfuscator;

    @Inject
    public ClientExceptionHandler(StackTraceDeobfuscator deobfuscator) {
        this.deobfuscator = deobfuscator;
    }

    @Override
    public void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException {
        try {
            handleData(Util.slurpUtf8(req.getInputStream()));
        } catch (JSONException e) {
            throw new RuntimeException(e);
        }
    }

    private void handleData(String raw) throws JSONException {
        log.info("raw data: " + raw);
        JSONObject data = new JSONObject(raw);
        Level level = "SEVERE".equals(data.getString("level")) ? Level.SEVERE : Level.WARNING;
        StringBuilder b = new StringBuilder();
        b.append("[" + data.getString("stream") + ":" + data.getLong("timestamp") + "] ");
        JSONArray objects = data.getJSONArray("objects");
        for (int i = 0; i < objects.length(); i++) {
            b.append(objects.getString(i));
        }
        ClientException ex = null;
        if (data.has("exception")) {
            ex = buildException(data.getJSONObject("exception"), data.getString("strongName"));
        }
        log.log(level, b.toString(), ex);
    }

    private ClientException buildException(JSONObject data, String strongName) throws JSONException {
        ClientException cause = null;
        if (data.has("cause")) {
            cause = buildException(data.getJSONObject("cause"), strongName);
        }
        JSONArray stData = data.getJSONArray("stackTrace");
        String[] st = new String[stData.length()];
        for (int i = 0; i < st.length; i++) {
            st[i] = stData.getString(i);
        }

        String exceptionConstructor = data.getString("name").replace("Class$", "");
        return new ClientException(deobfuscator.resymbolize(exceptionConstructor, strongName).getClassName() + "?", // NOTE(danilatos): sometimes the class name might be wrong.
                data.getString("message"), deobfuscator.deobfuscateStackTrace(st, strongName), cause);
    }
}