nap-core 0.4.2

Core library for the Narrative Addressing Protocol
Documentation 
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// SPDX-FileCopyrightText: 2026 Digital Creations
// SPDX-License-Identifier: MIT
//! Lore server configuration generation
//!
//! Generates local.toml configuration for Lore server with platform-independent paths
//! and recommended persistent defaults for NAP-managed deployments.

use anyhow::{Context, Result};
use std::fs;
use std::path::Path;

/// Generate Lore server configuration for local deployment
///
/// Creates a complete local.toml configuration file with:
/// - Persistent stores under NAP home directory
/// - Persistent certificates
/// - Recommended defaults for local development
pub fn generate_local_config(nap_home: &Path) -> Result<ConfigFiles> {
    let lore_config_dir = nap_home.join("lore").join("config");
    let local_toml_path = lore_config_dir.join("local.toml");

    fs::create_dir_all(&lore_config_dir).context("Failed to create Lore config directory")?;

    // Only regenerate if missing
    if local_toml_path.exists() {
        tracing::info!("Lore config already exists at {:?}", local_toml_path);
        return Ok(ConfigFiles {
            config_path: local_toml_path,
            config_dir: lore_config_dir,
        });
    }

    tracing::info!("Generating Lore server configuration");

    let config = generate_config_toml(nap_home);
    fs::write(&local_toml_path, config).context("Failed to write Lore configuration file")?;

    tracing::info!("Lore configuration generated at {:?}", local_toml_path);

    Ok(ConfigFiles {
        config_path: local_toml_path,
        config_dir: lore_config_dir,
    })
}

/// Generate the TOML configuration content
fn generate_config_toml(nap_home: &Path) -> String {
    let immutable_path = nap_home.join("lore").join("store").join("immutable");
    let mutable_path = nap_home.join("lore").join("store").join("mutable");
    let _cert_path = nap_home.join("lore").join("certs").join("cert.pem");
    let _key_path = nap_home.join("lore").join("certs").join("key.pem");

    format!(
        r#"
# =============================================================================
# Lore Server Configuration (Generated by NAP SDK)
# =============================================================================
# This configuration is automatically generated by the NAP SDK.
# Manual modifications may be overwritten.

[server]
connection_close_timeout_seconds = 5
runtime_shutdown_timeout_seconds = 25

# Public facing QUIC server settings
[server.quic]
enabled = true
host = "0.0.0.0"
port = 41337
verify_client_certs = false
idle_timeout = 30_000
keep_alive = 500
max_bidi_streams = 8
num_listeners = 10
transport_bits_per_second = 1_073_741_824  # 1 gbit/s
transport_rtt = 100  # 100 ms
handler_timeout_seconds = 50

# gRPC server settings
[server.grpc]
enabled = true
host = "0.0.0.0"
port = 41337
request_handler_timeout_seconds = 50
verify_client_certs = false

# HTTP server settings
[server.http]
enabled = true
host = "0.0.0.0"
port = 41339
max_file_size = 10_485_760  # 10MB
request_timeout_seconds = 300
request_body_timeout_seconds = 3600
available_interval_seconds = 30
available_timeout_seconds = 5
store_health_check = false

# =============================================================================
# Store Configuration
# =============================================================================

[immutable_store]
mode = "local"

[immutable_store.local]
path = "{}"
flush_delay_seconds = 10

[mutable_store]
mode = "local"

[mutable_store.local]
path = "{}"
flush_delay_seconds = 10

[lock_store]
mode = "local"

# =============================================================================
# Tokio Runtime Configuration
# =============================================================================

[tokio]
max_blocking_threads = 512

# =============================================================================
# Telemetry Configuration
# =============================================================================

[telemetry.logger]
enable_otlp = false
format = "json"
output = "stdout"

[telemetry.metrics]
export_interval_millis = 30000
sample_interval_millis = 10000

[telemetry.traces]
sample_rate = 0.05
sample_rate_low_tier = 0.001

# =============================================================================
# Notification Configuration
# =============================================================================

[notification]
mode = "local"

# =============================================================================
# Other Features Configuration
# =============================================================================

[feature]
history_step_size = 100
"#,
        immutable_path.display(),
        mutable_path.display()
    )
}

/// Paths to generated configuration files
#[derive(Debug, Clone)]
pub struct ConfigFiles {
    pub config_path: std::path::PathBuf,
    pub config_dir: std::path::PathBuf,
}

#[cfg(test)]
mod tests {
    use super::*;
    use tempfile::TempDir;

    #[test]
    fn test_generate_local_config() {
        let temp_dir = TempDir::new().unwrap();
        let nap_home = temp_dir.path();

        let files = generate_local_config(nap_home).unwrap();

        assert!(files.config_path.exists());
        assert!(files.config_dir.exists());

        // Verify configuration content
        let content = fs::read_to_string(&files.config_path).unwrap();
        assert!(content.contains("[server.quic]"));
        assert!(content.contains("port = 41337"));
        assert!(content.contains("[immutable_store.local]"));
        assert!(content.contains("[mutable_store.local]"));

        // Verify we can regenerate without error (should skip if exists)
        let files2 = generate_local_config(nap_home).unwrap();
        assert_eq!(files.config_path, files2.config_path);
    }

    #[test]
    fn test_config_toml_content() {
        let temp_dir = TempDir::new().unwrap();
        let nap_home = temp_dir.path();

        let config = generate_config_toml(nap_home);

        // Verify key configuration sections
        assert!(config.contains("[server.quic]"));
        assert!(config.contains("port = 41337"));
        assert!(config.contains("[server.grpc]"));
        assert!(config.contains("[server.http]"));
        assert!(config.contains("port = 41339"));
        assert!(config.contains("[immutable_store]"));
        assert!(config.contains("mode = \"local\""));
        assert!(config.contains("[mutable_store]"));
        assert!(config.contains("[lock_store]"));
        assert!(config.contains("[telemetry.logger]"));
        assert!(config.contains("[telemetry.metrics]"));
        assert!(config.contains("[notification]"));
        assert!(config.contains("[feature]"));

        // Verify paths are included
        assert!(config.contains(&nap_home.display().to_string()));
    }
}