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Bart Vries d40bc43ac1 Refactor logging to allow a loggerfactory per session (#1673)
* Refactor logging to allow a loggerfactory per session specified in the ConnectionInfo.

This commit introduces an `ILoggerFactory` to various classes, replacing the static logger factory with an instance-based approach for more flexible and session-specific logging. These changes improve the logging framework's flexibility and maintainability and allow unit testing of logging.

* Improvements bases on feedback. Fixed tests. Added documentation.

* Update src/Renci.SshNet/ConnectionInfo.cs

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Co-authored-by: Rob Hague <rob.hague00@gmail.com>
2025-07-26 21:24:48 +02:00

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Logging
=================
SSH.NET uses the [Microsoft.Extensions.Logging](https://learn.microsoft.com/dotnet/core/extensions/logging) API to log diagnostic messages.
It is possible to specify a logger in the `ConnectionInfo`, for example:
```cs
using Microsoft.Extensions.Logging;
ILoggerFactory loggerFactory = LoggerFactory.Create(builder =>
{
builder.SetMinimumLevel(LogLevel.Debug);
builder.AddConsole();
});
var connectionInfo = new ConnectionInfo("sftp.foo.com",
"guest",
new PasswordAuthenticationMethod("guest", "pwd"));
connectionInfo.LoggerFactory = loggerFactory;
using (var client = new SftpClient(connectionInfo))
{
client.Connect();
}
```
You can also register an application-wide `ILoggerFactory` before using the SSH.NET APIs, this will be used as a fallback if the `ConnectionInfo` is not set, for example:
```cs
using Microsoft.Extensions.Logging;
ILoggerFactory loggerFactory = LoggerFactory.Create(builder =>
{
builder.SetMinimumLevel(LogLevel.Debug);
builder.AddConsole();
});
Renci.SshNet.SshNetLoggingConfiguration.InitializeLogging(loggerFactory);
```
All messages by SSH.NET are logged under the `Renci.SshNet` category.