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/*
* Copyright (C) 2020 The Android Open Source Project
*
* 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.android.internal.protolog;
import android.annotation.Nullable;
import android.util.Slog;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;
import java.util.zip.GZIPInputStream;
/**
* Handles loading and parsing of ProtoLog viewer configuration.
*/
public class ProtoLogViewerConfigReader {
private static final String TAG = "ProtoLogViewerConfigReader";
private Map<Integer, String> mLogMessageMap = null;
/** Returns message format string for its hash or null if unavailable. */
public synchronized String getViewerString(int messageHash) {
if (mLogMessageMap != null) {
return mLogMessageMap.get(messageHash);
} else {
return null;
}
}
/**
* Reads the specified viewer configuration file. Does nothing if the config is already loaded.
*/
public synchronized void loadViewerConfig(PrintWriter pw, String viewerConfigFilename) {
try {
loadViewerConfig(new GZIPInputStream(new FileInputStream(viewerConfigFilename)));
logAndPrintln(pw, "Loaded " + mLogMessageMap.size()
+ " log definitions from " + viewerConfigFilename);
} catch (FileNotFoundException e) {
logAndPrintln(pw, "Unable to load log definitions: File "
+ viewerConfigFilename + " not found." + e);
} catch (IOException e) {
logAndPrintln(pw, "Unable to load log definitions: IOException while reading "
+ viewerConfigFilename + ". " + e);
} catch (JSONException e) {
logAndPrintln(pw, "Unable to load log definitions: JSON parsing exception while reading "
+ viewerConfigFilename + ". " + e);
}
}
/**
* Reads the specified viewer configuration input stream.
* Does nothing if the config is already loaded.
*/
public synchronized void loadViewerConfig(InputStream viewerConfigInputStream)
throws IOException, JSONException {
if (mLogMessageMap != null) {
return;
}
InputStreamReader config = new InputStreamReader(viewerConfigInputStream);
BufferedReader reader = new BufferedReader(config);
StringBuilder builder = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
builder.append(line).append('\n');
}
reader.close();
JSONObject json = new JSONObject(builder.toString());
JSONObject messages = json.getJSONObject("messages");
mLogMessageMap = new TreeMap<>();
Iterator it = messages.keys();
while (it.hasNext()) {
String key = (String) it.next();
try {
int hash = Integer.parseInt(key);
JSONObject val = messages.getJSONObject(key);
String msg = val.getString("message");
mLogMessageMap.put(hash, msg);
} catch (NumberFormatException expected) {
// Not a messageHash - skip it
}
}
}
/**
* Returns the number of loaded log definitions kept in memory.
*/
public synchronized int knownViewerStringsNumber() {
if (mLogMessageMap != null) {
return mLogMessageMap.size();
}
return 0;
}
static void logAndPrintln(@Nullable PrintWriter pw, String msg) {
Slog.i(TAG, msg);
if (pw != null) {
pw.println(msg);
pw.flush();
}
}
}
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