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Tapeti/Tapeti.Cmd/Verbs/BaseConnectionOptions.cs
Mark van Renswoude f16921d12d Allow environment variables for Tapeti.Cmd connection parameters
Output connection parameters and their sources to the console
2021-09-07 15:56:59 +02:00

94 lines
4.2 KiB
C#

using System;
using CommandLine;
using RabbitMQ.Client;
using Tapeti.Cmd.ConsoleHelper;
namespace Tapeti.Cmd.Verbs
{
public class BaseConnectionOptions
{
[Option('h', "host", HelpText = "(Default: localhost) Hostname of the RabbitMQ server. Can also be set using the TAPETI_HOST environment variable.")]
public string Host { get; set; }
[Option("port", HelpText = "(Default: 5672) AMQP port of the RabbitMQ server. Can also be set using the TAPETI_PORT environment variable.")]
public int? Port { get; set; }
[Option('v', "virtualhost", HelpText = "(Default: /) Virtual host used for the RabbitMQ connection. Can also be set using the TAPETI_VIRTUALHOST environment variable.")]
public string VirtualHost { get; set; }
[Option('u', "username", HelpText = "(Default: guest) Username used to connect to the RabbitMQ server. Can also be set using the TAPETI_USERNAME environment variable.")]
public string Username { get; set; }
[Option('p', "password", HelpText = "(Default: guest) Password used to connect to the RabbitMQ server. Can also be set using the TAPETI_PASSWORD environment variable.")]
public string Password { get; set; }
public ConnectionFactory CreateConnectionFactory(IConsole console)
{
var consoleWriter = console.GetPermanentWriter();
consoleWriter.WriteLine("Using connection parameters:");
var factory = new ConnectionFactory
{
HostName = GetOptionOrEnvironmentValue(consoleWriter, " Host : ", Host, "TAPETI_HOST", "localhost"),
Port = GetOptionOrEnvironmentValue(consoleWriter, " Port : ", Port, "TAPETI_PORT", 5672),
VirtualHost = GetOptionOrEnvironmentValue(consoleWriter, " Virtual host : ", VirtualHost, "TAPETI_VIRTUALHOST", "/"),
UserName = GetOptionOrEnvironmentValue(consoleWriter, " Username : ", Username, "TAPETI_USERNAME", "guest"),
Password = GetOptionOrEnvironmentValue(consoleWriter, " Password : ", Password, "TAPETI_PASSWORD", "guest", true)
};
consoleWriter.WriteLine("");
return factory;
}
private static string GetOptionOrEnvironmentValue(IConsoleWriter consoleWriter, string consoleDisplayName, string optionValue, string environmentName, string defaultValue, bool hideValue = false)
{
string GetDisplayValue(string value)
{
return hideValue
? "<hidden>"
: value;
}
if (!string.IsNullOrEmpty(optionValue))
{
consoleWriter.WriteLine($"{consoleDisplayName}{GetDisplayValue(optionValue)} (from command-line)");
return optionValue;
}
var environmentValue = Environment.GetEnvironmentVariable(environmentName);
if (!string.IsNullOrEmpty(environmentValue))
{
consoleWriter.WriteLine($"{consoleDisplayName}{GetDisplayValue(environmentValue)} (from environment variable)");
return environmentValue;
}
consoleWriter.WriteLine($"{consoleDisplayName}{GetDisplayValue(defaultValue)} (default)");
return defaultValue;
}
private static int GetOptionOrEnvironmentValue(IConsoleWriter consoleWriter, string consoleDisplayName, int? optionValue, string environmentName, int defaultValue)
{
if (optionValue.HasValue)
{
consoleWriter.WriteLine($"{consoleDisplayName}{optionValue} (from command-line)");
return optionValue.Value;
}
var environmentValue = Environment.GetEnvironmentVariable(environmentName);
if (!string.IsNullOrEmpty(environmentValue) && int.TryParse(environmentValue, out var environmentIntValue))
{
consoleWriter.WriteLine($"{consoleDisplayName}{environmentIntValue} (from environment variable)");
return environmentIntValue;
}
consoleWriter.WriteLine($"{consoleDisplayName}{defaultValue} (default)");
return defaultValue;
}
}
}