README

Overview
Install
Quickstart
Writers
- File
- Mail
- Database
- HTTP
Context
Limits

Overview

pop-log is a logging component that provides a way of logging events following the standard BSD syslog protocol outlined in RFC-3164. Support is built-in for writing log messages to a file or database table or deploying them via email or HTTP. The eight available log message severity values are:

EMERG (0)
ALERT (1)
CRIT (2)
ERR (3)
WARN (4)
NOTICE (5)
INFO (6)
DEBUG (7)

and are available via their respective methods:

$log->emergency($message);
$log->alert($message);
$log->critical($message);
$log->error($message);
$log->warning($message);
$log->notice($message);
$log->info($message);
$log->debug($message);

pop-log is a component of the Pop PHP Framework.

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Install

Install pop-log using Composer.

composer require popphp/pop-log

Or, require it in your composer.json file

"require": {
    "popphp/pop-log" : "^4.0.2"
}

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Quickstart

This is a basic example using the file writer:

use Pop\Log\Logger;
use Pop\Log\Writer\File;

$log = new Logger(new File(__DIR__ . '/logs/app.log'));

$log->info('Just a info message');
$log->alert('Look Out! Something serious happened!');

Then, your 'app.log' file will contain:

2015-07-11 12:32:32    6    INFO    Just a info message
2015-07-11 12:32:33    1    ALERT   Look Out! Something serious happened!

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Writers

There are four available log writers, but others can be created if they implement the Pop\Log\Writer\WriterInterface.

File

The file log writer simply stores the log output to a log file on disk. The log file format is derived from the log filename. Supported log file types include:

Plain text (.log or .txt)
CSV (.csv)
TSV (.tsv)
XML (.xml)
JSON (.json)

use Pop\Log\Logger;
use Pop\Log\Writer\File;

$log = new Logger(new File(__DIR__ . '/logs/app.csv'));

$context = [
    'name'      => 'my-log-entry',
    'timestamp' => date('Y-m-d H:i:s')
];

$log->info('Just a info message', $context);

The above code creates a CSV file with the log entry:

2023-10-31 15:58:28,6,my-log-entry,"Just a info message",

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Mail

The mail log writer sends the log entries via email using the popphp/pop-mail component. The constructor requires a Pop\Mail\Mailer object and at least one email as the second argument. An optional third argument allows you to pass in additional email headers, like a subject and CC addresses.

use Pop\Log\Logger;
use Pop\Log\Writer\Mail;
use Pop\Mail\Mailer;
use Pop\Mail\Transport\Sendmail;

$emails  = ['sysadmin@mydomain.com', 'logs@mydomain.com'];
$options = [
    'subject' => 'Custom Log Entry:',
    'cc'      => 'another@mydomain.com'
];

$mailer = new Mailer(new Sendmail());
$log    = new Logger(new Mail($mailer, $emails, $options));

$log->info('Just a info message');
$log->alert('Look Out! Something serious happened!');

Then the emails listed above will receive a series of emails like this:

Subject: Custom Log Entry: INFO (6)
2023-11-11 12:32:32    6    INFO    Just a info message

Subject: Custom Log Entry: ALERT (1)
2023-11-11 12:32:33    1    ALERT   Look Out! Something serious happened!

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Database

Writing a log to a table in a database requires the popphp/pop-db component. The database writer constructor takes an instance of Pop\Db\Adapter\AbstractAdapter and also an optional $table argument (the default table name is pop_log).

use Pop\Db\Db;
use Pop\Log\Logger;
use Pop\Log\Writer\Database;

$db  = Db::connect('sqlite', __DIR__ . '/logs/.htapplog.sqlite');
$log = new Logger(new Database($db, 'system_logs'));

$log->info('Just a info message');
$log->alert('Look Out! Something serious happened!');

In this case, the logs are written to a database table that has the columns id, timestamp, level, name and message. So, after the example above, your database table would look like this:

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HTTP

Using the HTTP writer requires the pop-http component. It creates a request and sends it to the HTTP logging resource. (Refer to the pop-http documentation for more information on how to use the HTTP client.)

use Pop\Log\Logger;
use Pop\Log\Writer;
use Pop\Http\Client;
use Pop\Http\Auth;

$client = new Client(
    'https://logs.mydomain.com/',
    ['method' => 'POST'],
    Auth::createKey('LOG_API_KEY')
);

$log = new Logger(new Writer\Http($client);
$log->info('Just a info message');
$log->alert('Look Out! Something serious happened!');

The log writer will send HTTP requests with the log data to the HTTP service with the following HTTP data fields:

timestamp
level
name
message
context

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Context

For additional contextual information, the $context array can be passed to the methods called to trigger the log entry. It can contain:

$context = [
    'name'      => 'my-log-entry',
    'timestamp' => date('Y-m-d H:i:s'),
    'format'    => 'json'
];

use Pop\Log\Logger;
use Pop\Log\Writer\File;

$log = new Logger(new File(__DIR__ . '/logs/app.log'));

$context = [
    'name'      => 'my-log-entry',
    'timestamp' => date('Y-m-d H:i:s')
];

$log->info('Just a info message', $context);

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Limits

Log level limits can be set for the log writer objects to enforce the severity of which log messages actually get logged:

use Pop\Log\Logger;
use Pop\Log\Writer\File;

$prodLog = new File(__DIR__ . '/logs/app_prod.log');
$devLog  = new File(__DIR__ . '/logs/app_dev.log');

$prodLog->setLogLimit(3); // Log only ERROR (3) and above
$devLog->setLogLimit(6);  // Log only INFO (6) and above

$log = new Logger([$prodLog, $devLog]);

$log->alert('Look Out! Something serious happened!'); // Will write to both writers
$log->info('Just a info message');                    // Will write to only app_dev.log

The app_prod.log file will contain:

2023-11-11 12:32:33    1    ALERT   Look Out! Something serious happened!

And the app_dev.log file will contain:

2023-11-11 12:32:33    1    ALERT   Look Out! Something serious happened!
2023-11-11 12:32:34    6    INFO    Just a info message

popphp / pop-log

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