/// <summary>
/// Creates a <see cref="IConfigurationSource"/> by combining environment variables,
/// AppSettings where available, and a local datadog.json file, if present.
/// </summary>
/// <returns>A new <see cref="IConfigurationSource"/> instance.</returns>
public static CompositeConfigurationSource CreateDefaultConfigurationSource()
{
// env > AppSettings > datadog.json
var configurationSource = new CompositeConfigurationSource
{
new EnvironmentConfigurationSource(),
#if !NETSTANDARD2_0
// on .NET Framework only, also read from app.config/web.config
new NameValueConfigurationSource(System.Configuration.ConfigurationManager.AppSettings)
#endif
};
// if environment variable is not set, look for default file name in the current directory
var configurationFileName = configurationSource.GetString(ConfigurationKeys.ConfigurationFileName) ??
Path.Combine(System.Environment.CurrentDirectory, "datadog.json");
if (Path.GetExtension(configurationFileName).ToUpperInvariant() == ".JSON" &&
File.Exists(configurationFileName))
{
configurationSource.Add(JsonConfigurationSource.FromFile(configurationFileName));
}
return(configurationSource);
}
private static bool TryLoadJsonConfigurationFile(IConfigurationSource configurationSource, out IConfigurationSource jsonConfigurationSource)
{
try
{
// if environment variable is not set, look for default file name in the current directory
var configurationFileName = configurationSource.GetString(ConfigurationKeys.ConfigurationFileName) ??
configurationSource.GetString("DD_DOTNET_TRACER_CONFIG_FILE") ??
Path.Combine(GetCurrentDirectory(), "datadog.json");
if (string.Equals(Path.GetExtension(configurationFileName), ".JSON", StringComparison.OrdinalIgnoreCase) &&
File.Exists(configurationFileName))
{
jsonConfigurationSource = JsonConfigurationSource.FromFile(configurationFileName);
return(true);
}
}
catch (Exception)
{
// Unable to load the JSON file from disk
// The configuration manager should not depend on a logger being bootstrapped yet
// so do not do anything
}
jsonConfigurationSource = default;
return(false);
}
private static bool TryLoadJsonConfigurationFile(string configurationFileName, out JsonConfigurationSource jsonConfigurationSource)
{
try
{
if (!string.IsNullOrWhiteSpace(configurationFileName) &&
string.Equals(Path.GetExtension(configurationFileName), ".JSON", StringComparison.OrdinalIgnoreCase) &&
File.Exists(configurationFileName))
{
jsonConfigurationSource = JsonConfigurationSource.FromFile(configurationFileName);
return(true);
}
}
catch (Exception)
{
// Unable to load the JSON file from disk
// The configuration manager should not depend on a logger being bootstrapped yet
// so do not do anything
}
jsonConfigurationSource = default;
return(false);
}
/// <summary>
/// Creates a <see cref="IConfigurationSource"/> by combining environment variables,
/// AppSettings where available, and a local datadog.json file, if present.
/// </summary>
/// <returns>A new <see cref="IConfigurationSource"/> instance.</returns>
internal static CompositeConfigurationSource CreateDefaultConfigurationSource()
{
// env > AppSettings > datadog.json
var configurationSource = new CompositeConfigurationSource
{
new EnvironmentConfigurationSource(),
#if NETFRAMEWORK
// on .NET Framework only, also read from app.config/web.config
new NameValueConfigurationSource(System.Configuration.ConfigurationManager.AppSettings)
#endif
};
string currentDirectory = System.Environment.CurrentDirectory;
#if NETFRAMEWORK
// on .NET Framework only, use application's root folder
// as default path when looking for datadog.json
if (System.Web.Hosting.HostingEnvironment.IsHosted)
{
currentDirectory = System.Web.Hosting.HostingEnvironment.MapPath("~");
}
#endif
// if environment variable is not set, look for default file name in the current directory
var configurationFileName = configurationSource.GetString(ConfigurationKeys.ConfigurationFileName) ??
configurationSource.GetString("DD_DOTNET_TRACER_CONFIG_FILE") ??
Path.Combine(currentDirectory, "datadog.json");
if (Path.GetExtension(configurationFileName).ToUpperInvariant() == ".JSON" &&
File.Exists(configurationFileName))
{
configurationSource.Add(JsonConfigurationSource.FromFile(configurationFileName));
}
return(configurationSource);
}
private static bool TryLoadJsonConfigurationFile(IConfigurationSource configurationSource, out JsonConfigurationSource jsonConfigurationSource)
{
// if environment variable is not set, look for default file name in the current directory
var configurationFileName = configurationSource.GetString(ConfigurationKeys.ConfigurationFileName) ??
configurationSource.GetString("OTEL_DOTNET_TRACER_CONFIG_FILE");
return(TryLoadJsonConfigurationFile(configurationFileName, out jsonConfigurationSource));
}
private static bool TryLoadPluginJsonConfigurationFile(IConfigurationSource configurationSource, out JsonConfigurationSource jsonConfigurationSource)
{
var configurationFileName = configurationSource?.GetString(ConfigurationKeys.PluginConfigurationFileName);
return(TryLoadJsonConfigurationFile(configurationFileName, out jsonConfigurationSource));
}