Kalev is a structured logger for JVM (Java, Kotlin etc)
The idea of Kalev is pretty similar to Timber. Library provides Kalevipoeg interface with which you may implement various behaviour for log entries reaction.
kalev-lib provides pure JVM implementation. Doesn't contains any implementation of Kalevipoeg
kalev-android contains bridge between Kalev and Android's log system. PrintPoeg format log entry as JSON string and print it to LogCat.
kalev-okhttp provide interceptor for okhttp to log network requests in Kalev-way
Two easy steps:
- Add any
Kalevipoeginstances you want on application start. In Android applicationonCreateis a most suitable place - Call Kalev's static methods everywhere throughout your app.
Check full Android sample at sample dir
Kalev encourages careful, structured logging through logging fields instead of long, unparseable error messages. For example, instead of: Log.e("Failed to send event %s to topic %s with key %d", userEvent, selectedTopic, eventKey), you should log the much more discoverable:
Kalev.with("event", userEvent)
.with("key", eventKey)
.with("topic", selectedTopic)
.e("Failed to send event")Note, that with call is optional
Kalev provides 5 levels of logs: verbose, debug, info, warning and error.
Kalev.v("Fragment created")
Kalev.v(throwable, "Fragment wasn't added")
Kalev.d("User logged in")
Kalev.d(throwable, "User error")
Kalev.i("Added item to bucket")
Kalev.i(throwable, "Busket is full")
Kalev.w("Paying for order")
Kalev.w(throwable, "Failed to pay")
Kalev.e("Smth happens")
Kalev.e(throwable, "Smth happened")Besides the fields added with with some fields are automatically added to all logging events:
severity The logging level. E.g. i.
timestamp The timestamp when the entry was created.
message The logging message passed to {v, d, i, w, e} after the with call. E.g. Failed to send event.
Add LoggingInterceptor to your OkHttpClient to log network requests in Kalev-way.
Examples of network logs:
{
"message": "network",
"method": "GET",
"path": "\/get",
"id": "42",
"response.code": 200,
"response.body": {
"args": {
"id": "42"
},
"headers": {
"Accept-Encoding": "gzip",
"Content-Type": "application\/json",
"Host": "httpbin.org",
"User-Agent": "okhttp\/3.12.12",
"X-Amzn-Trace-Id": "Root=1-5ed772b8-71eaec363ea2adcca9201200"
},
"url": "https:\/\/httpbin.org\/get?id=42"
}
}{
"message": "network",
"method": "GET",
"path": "\/unknown",
"id": "42",
"response.code": 404,
"response.body": "<!DOCTYPE HTML PUBLIC \"-\/\/W3C\/\/DTD HTML 3.2 Final\/\/EN\">\n<title>404 Not Found<\/title>\n<h1>Not Found<\/h1>\n<p>The requested URL was not found on the server. If you entered the URL manually please check your spelling and try again.<\/p>\n"
}Kalev creates new object for every log entry which may abuse performance in case of stream of entries. You can go around of this issue with FastLog.
There is FastLog interface which describes fast logger.
kalev-lib provides SystemFastLog implementation which prints messages to standard output stream
kalev-android provides AndroidFastLog implementation which prints messages to Android's LogCat
Kalev.fastLog = AndroidFastLog()
Kalev.fastLog?.v("Activity created")
Add this to your dependencies block.
implementation 'eu.bolt:kalev:$latest'
To use an android extension use this dependency instead:
implementation 'eu.bolt:kalev-android:$latest'
Kalev-okhttp package:
implementation 'eu.bolt:kalev-okhttp:$latest'
Kaleva - also known as Kalevi or Kalev - and his sons are important heroic figures in Estonian, Finnish and Karelian mythology. Wiki
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