HyperLog Android
- Overview
- Log format
- Download
- Initialize
- Usage
- Get Logs in a File
- Push Logs Files to Remote Server
- Custom Log Message Format
- Additional Methods
- Contribute
- About HyperTrack
- License
Overview
A utility logger library for Android on top of standard Android Log
class for debugging purpose. This is a simple library that will allow Android apps or library to store log
into database
so that developer can pull the logs from the database into File
or push the logs to your remote server
for debugging
purpose. Want to know more on this and wondering why you should prefer using this library over doing it yourself. Check out the blog post or sample apk.
Log Format
timeStamp + " | " + appVersion + " : " + osVersion + " | " + deviceUUID + " | [" + logLevelName + "]: " + message
2017-10-05T14:46:36.541Z 1.0 | 0.0.1 : Android-7.1.1 | 62bb1162466c3eed | [INFO]: Log has been pushed
Download
Download the latest version or grab via Gradle.
The library is available on mavenCentral()
and jcenter()
. In your module's build.gradle
, add the following code snippet and run the gradle-sync
.
dependencies {
...
compile 'com.hypertrack:hyperlog:0.0.10'
...
}
Initialize
Inside onCreate
of Application class or Launcher Activity.
HyperLog.initialize(this);
HyperLog.setLogLevel(Log.VERBOSE);
Usage
HyperLog.d(TAG,"Debug Log");
Get Logs in a File
File file = HyperLog.getDeviceLogsInFile(this);
Push Logs Files to Remote Server
Logs file can be pushed to your remote server or RequestBin
(for testing) or to Logstash
.
Steps:
- Set the API Endpoint URL
HyperLog.setURL
before callingHyperLog.pushLogs
method otherwiseexception
will be thrown. Developers can also set a testing endpoint usingRequestBin
.
HyperLog.setURL("API URL");
- Push Logs file to the given endpoint.
HyperLog.pushLogs(this, false, new HLCallback() {
@Override
public void onSuccess(@NonNull Object response) {
}
@Override
public void onError(@NonNull VolleyError HLErrorResponse) {
}
});
RequestBin
Follow steps to setup testing endpoint at - Visit the
RequestBin
site and create aRequestBin
. - Once you have the bin created, copy the URL and set it to the
HyperLog.setURL
. - Now call
HyperLog.pushLogs
to push the logs file to given endpoint. This is asynchronous call. - After
HyperLog.pushLogs
success, reload the requestbin page to view exactly which requests were made, what headers were sent, and raw body and so on, all in a pretty graphical setting like below image. - Once you get the logs on
RequestBin
create your own endpoint on your server and start receiving logs on to your server for debugging. - (Optional) From your server you can directly push those to
Logstash
(part of ELK stack). We have discussed ELK in one of our blog.
Request Bin Sample Response
Setup example endpoint inside Django
The example code below will set you up with a view that can handle uploaded log files, decompress gzip, and print the contents of the file.
from rest_framework import views
class SDKLogFileAPIView(views.APIView):
'''
SDK Log endpoint for file uploads
Example curl call:
curl -i -X POST
-H "Content-Type: multipart/form-data"
-H "Authorization: token pk_e6c9cf663714fb4b96c12d265df554349e0db79b"
-H "Content-Disposition: attachment; filename=upload.txt"
-F "data=@/Users/Arjun/Desktop/filename.txt"
localhost:8000/api/v1/logs/
'''
parser_classes = (
parsers.FileUploadParser,
)
def post(self, request):
'''
Prints logs to stdout (accepts file)
'''
if request.FILES:
device_id = self.request.META.get('HTTP_DEVICE_ID', 'None')
user_agent = self.request.META.get('HTTP_USER_AGENT', 'None')
expect_header = self.request.META.get('HTTP_EXPECT', 'None')
file_obj = request.FILES['file']
logger.info('Received log file of size %s bytes from device id: %s and user agent: %s and expect header: %s' %
(str(file_obj.size), device_id, user_agent, expect_header))
self.decompress_file(file_obj)
return Response({})
def decompress_file(self, f):
'''
Decompress the gzip file and then print it to stdout
so that logstash can pick it up. In case Content-Encoding
is not gzip, then the normal method picks up the file.
'''
if not self.request.META.get('HTTP_CONTENT_ENCODING') == 'gzip':
return self.handle_uploaded_file(f)
result = StringIO.StringIO()
for chunk in f.chunks():
result.write(chunk)
stringified_value = result.getvalue()
result.close()
decompressor = zlib.decompressobj(16 + zlib.MAX_WBITS)
decompressed = decompressor.decompress(stringified_value)
for line in decompressed.split('\n'):
print line
def handle_uploaded_file(self, f):
'''
Handle django file to print, so that logstash
can pick it up.
'''
for chunk in f.chunks():
lines = chunk.split('\n')
for line in lines:
print line
Note:
- Push logs file to server in compressed form to reduce the data consumption and response time.
HyperLog.pushLogs(Context mContext, boolean compress, HyperLogCallback callback);
- Logs will be compressed using
GZIP
encoding. - Logs will be deleted from database after successful push.
- Logs will push to the server in batches. Each batch can have maximum of
5000 logs
.
Custom Log Message Format
Default Log Message that will store in database.
timeStamp + " | " + appVersion + " : " + osVersion + " | " + deviceUUID + " | [" + logLevelName + "]: " + message
2017-10-05T14:46:36.541Z 1.0 | 0.0.1 : Android-7.1.1 | 62bb1162466c3eed | [INFO]: Log has been pushed
This message can easily be customize.
- Create a new class extending
LogFormat
. - Override
getFormattedLogMessage
method. - Now return the formatted message.
class CustomLogMessageFormat extends LogFormat {
CustomLog(Context context) {
super(context);
}
public String getFormattedLogMessage(String logLevelName, String message, String timeStamp,
String senderName, String osVersion, String deviceUUID) {
//Custom Log Message Format
String formattedMessage = timeStamp + " : " + logLevelName + " : " + deviceUUID + " : " + message;
return formattedMessage;
}
}
Custom Log Message Format example
2017-10-05T14:46:36.541Z 1.0 | INFO | 62bb1162466c3eed | Log has been pushed
- Above created class instance then needs to be passed while initializing
HyperLog
or can be set later.
HyperLog.initialize(this,new CustomLogMessageFormat(this));
OR
HyperLog.initialize(this);
HyperLog.setLogFormat(new CustomLogMessageFormat(this));
Additional Methods
- Different types of log.
HyperLog.d(TAG,"debug");
HyperLog.i(TAG,"information");
HyperLog.e(TAG,"error");
HyperLog.v(TAG,"verbose");
HyperLog.w(TAG,"warning");
HyperLog.a(TAG,"assert");
HyperLog.exception(TAG,"exception",throwable);
- To check whether any device logs are available.
HyperLog.hasPendingDeviceLogs();
- Get the count of stored device logs.
HyperLog.logCount();
- Developer can pass additional headers along with API call while pushing logs to server.
HashMap<String, String> additionalHeaders = new HashMap<>();
additionalHeaders.put("Authorization","Token");
HyperLog.pushLogs(this, additionalHeaders, false, HLCallback);
- By default, seven days older logs will get delete automatically from the database. You can change the expiry period of logs by defining
expiryTimeInSeconds
.
HyperLog.initialize(@NonNull Context context, int expiryTimeInSeconds);
- Developers can also get the device log as a list of
DeviceLog
model or list ofString
.By default, fetched logs will delete from the database. Developers can override to change the default functionality.
HyperLog.getDeviceLogs(boolean deleteLogs);
HyperLog.getDeviceLogsInFile(Context mContext, boolean deleteLogs);
- By default, every get calls return data from first batch if there are one or more batch.
- If there are more than one batches then developer can gets the specific batch data by providing batch number.
HyperLog.getDeviceLogs(boolean deleteLogs, int batchNo);
- Get the number of batches using
HyperLog.getDeviceLogBatchCount
. - Developer can manually delete the logs using
HyperLog.deleteLogs
.
Contribute
Please use the issues tracker to raise bug reports and feature requests. We'd love to see your pull requests, so send them in!
About HyperTrack
Developers use HyperTrack to build location features, not infrastructure. We reduce the complexity of building and operating location features to a few APIs that just work. Sign up and start building! Join our Slack community to connect with other developers building location features. Email us at help@hypertrack.com if you need any help.
License
MIT License
Copyright (c) 2018 HyperTrack
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.