Monolog MongoDBHandler having BindingResolutionException error in Laravel 8 - php

Question

I tried to create a mongodb logging channel
'mongo' => [
'driver' => 'monolog',
'handler' => \Monolog\Handler\MongoDBHandler::class,
'formatter' => \Monolog\Formatter\MongoDBFormatter::class,
'handler_with' => [
'mongo' => new \MongoDB\Client("mongodb://localhost:27017"),
'database' => 'testdb',
'collection' => 'testcoll'
]
],
However, im getting error:
Illuminate\Contracts\Container\BindingResolutionException(code: 0): Unresolvable dependency resolving [Parameter #0 [ <required> $mongodb ]] in class Monolog\Handler\MongoDBHandler
The error is only resolved when I tried to add type hint to the class constructor but obviously I can't do that since it's a package:
public function __construct(Client<<if I add this it works>> $mongodb, string $database, string $collection, $level = Logger::DEBUG, bool $bubble = true)
Any solution for this?

Answer 1

So, I wanted to add here a complete answer because this post is the first one that shows up when looking for adding a mongo logger, and since the answer is buried in the comments, I wanted to add a proper answer.
The solution was to change the key mongo to mongodb in the handler_with array.
Leaving the working code like this:
'mongo' => [
'driver' => 'monolog',
'handler' => \Monolog\Handler\MongoDBHandler::class,
'formatter' => \Monolog\Formatter\MongoDBFormatter::class,
'handler_with' => [
'mongodb' => new \MongoDB\Client("mongodb://localhost:27017"),
'database' => 'testdb',
'collection' => 'testcoll'
]
],
Also, you could add the following element at the same level as formatter to set a custom max level of nesting. This is because, by default, the document stored cannot have a depth greater than 3, and it's automatically converted to "[...]" in the log.
'formatter_with' => [
'maxNestingLevel' => 10
],
Warning, in the probable event of a recursion, or an incredibly deep array, it can cause problems in mongo, because it doesn't support more than 100 levels of nesting, source.

Answer 2

According to the Laravel 8.x doc:
'mongo' => [
'driver' => 'monolog',
'handler' => \Monolog\Handler\MongoDBHandler::class,
'formatter' => \Monolog\Formatter\MongoDBFormatter::class,
'with' => [ // <-- This is `with` instead of `handler_with`
// 'mongodb' => new \MongoDB\Client("mongodb://localhost:27017"), <-- This line will cause an error in `php artisan config:cache`
'database' => 'testdb',
'collection' => 'testcoll'
],
],
So you need to configure the service for MongoDBHandler. as you mentioned with a look at the handler source code the first argument is $mongodb.
public function __construct($mongodb, string $database, string $collection, $level = Logger::DEBUG, bool $bubble = true)
and to be able to resolve this dependency we can configure service container:
// AppServiceProvider.php
// ...
public function register() {
$this->app->when(\Monolog\Handler\MongoDBHandler::class)
->needs('$mongodb')
->give(app(
\MongoDB\Client::class,
[
'uri' => 'mongodb://localhost:27017'
]
));
}
// ...