Differential D7715 Diff 26425 services/tunnelbroker/src/config.rs

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Standalone View

				use crate::constants;
				use anyhow::{ensure, Result};
				use clap::Parser;
				use once_cell::sync::Lazy;
				use tracing::info;

				#[derive(Parser)]
				#[command(version, about, long_about = None)]
				pub struct AppConfig {
				/// gRPC server listening port
				#[arg(long, default_value_t = constants::GRPC_SERVER_PORT)]
				pub grpc_port: u16,
				/// HTTP server listening port
				#[arg(long, default_value_t = 51001)]
				pub http_port: u16,
				/// AWS Localstack service URL
				#[arg(env = "LOCALSTACK_ENDPOINT")]
				#[arg(long)]
				pub localstack_endpoint: Option<String>,
				}

				/// Stores configuration parsed from command-line arguments
				/// and environment variables
				pub static CONFIG: Lazy<AppConfig> = Lazy::new(AppConfig::parse);

				/// Processes the command-line arguments and environment variables.
				/// Should be called at the beginning of the `main()` function.
				pub(super) fn parse_cmdline_args() -> Result<()> {
				// force evaluation of the lazy initialized config
				let cfg = Lazy::force(&CONFIG);

				// Perform some additional validation for CLI args
				ensure!(
				cfg.grpc_port != cfg.http_port,
				"gRPC and HTTP ports cannot be the same: {}",
				cfg.grpc_port
				);
				Ok(())
				}

				/// Provides region/credentials configuration for AWS SDKs
				pub async fn load_aws_config() -> aws_config::SdkConfig {
				let mut config_builder = aws_config::from_env();

				if let Some(endpoint) = &CONFIG.localstack_endpoint {
				info!("Using localstack URL: {}", endpoint);
				config_builder = config_builder.endpoint_url(endpoint);
				}

				config_builder.load().await
				}