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//! Application Instance ID Information Element
//!
//! The Application Instance ID IE identifies a specific application instance
//! that provides application services for detected application traffic.
//! Per 3GPP TS 29.244 Section 8.2.60, this is an OctetString type IE.
use crate::error::PfcpError;
use crate::ie::{Ie, IeType};
/// Application Instance ID
///
/// Identifies a specific application instance in the data network for
/// detected application traffic. Used in conjunction with Application Detection
/// to route traffic to specific application server instances.
///
/// # 3GPP Reference
/// 3GPP TS 29.244 Section 8.2.60
///
/// # Structure
/// Variable-length OctetString containing the application instance identifier
///
/// # Examples
///
/// ```
/// use rs_pfcp::ie::application_instance_id::ApplicationInstanceId;
///
/// // Create application instance ID for a specific server
/// let app_id = ApplicationInstanceId::new("server-01.example.com");
/// assert_eq!(app_id.value(), "server-01.example.com");
///
/// // Marshal and unmarshal
/// let bytes = app_id.marshal();
/// let parsed = ApplicationInstanceId::unmarshal(&bytes).unwrap();
/// assert_eq!(app_id, parsed);
/// ```
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct ApplicationInstanceId {
/// Application instance identifier
instance_id: String,
}
impl ApplicationInstanceId {
/// Create a new Application Instance ID
///
/// # Arguments
/// * `instance_id` - Application instance identifier string
///
/// # Example
/// ```
/// use rs_pfcp::ie::application_instance_id::ApplicationInstanceId;
///
/// let app_id = ApplicationInstanceId::new("cdn-server-1");
/// assert_eq!(app_id.value(), "cdn-server-1");
/// ```
pub fn new(instance_id: &str) -> Self {
ApplicationInstanceId {
instance_id: instance_id.to_string(),
}
}
/// Get the application instance identifier value
///
/// # Example
/// ```
/// use rs_pfcp::ie::application_instance_id::ApplicationInstanceId;
///
/// let app_id = ApplicationInstanceId::new("video-server-01");
/// assert_eq!(app_id.value(), "video-server-01");
/// ```
pub fn value(&self) -> &str {
&self.instance_id
}
/// Check if the application instance ID is empty
///
/// # Example
/// ```
/// use rs_pfcp::ie::application_instance_id::ApplicationInstanceId;
///
/// let app_id = ApplicationInstanceId::new("server-1");
/// assert!(!app_id.is_empty());
///
/// let empty_id = ApplicationInstanceId::new("");
/// assert!(empty_id.is_empty());
/// ```
pub fn is_empty(&self) -> bool {
self.instance_id.is_empty()
}
/// Marshal Application Instance ID to bytes
///
/// # Returns
/// Byte vector containing UTF-8 encoded instance identifier
pub fn marshal(&self) -> Vec<u8> {
self.instance_id.as_bytes().to_vec()
}
/// Unmarshal Application Instance ID from bytes
///
/// # Arguments
/// * `data` - Byte slice containing UTF-8 encoded instance identifier
///
/// # Errors
/// Returns error if data is not valid UTF-8
///
/// # Example
/// ```
/// use rs_pfcp::ie::application_instance_id::ApplicationInstanceId;
///
/// let app_id = ApplicationInstanceId::new("game-server-5");
/// let bytes = app_id.marshal();
/// let parsed = ApplicationInstanceId::unmarshal(&bytes).unwrap();
/// assert_eq!(app_id, parsed);
/// ```
pub fn unmarshal(data: &[u8]) -> Result<Self, PfcpError> {
let instance_id = String::from_utf8(data.to_vec()).map_err(|_| {
PfcpError::invalid_value("Application Instance ID", "instance_id", "invalid UTF-8")
})?;
Ok(ApplicationInstanceId { instance_id })
}
/// Convert to generic IE
///
/// # Example
/// ```
/// use rs_pfcp::ie::application_instance_id::ApplicationInstanceId;
/// use rs_pfcp::ie::IeType;
///
/// let app_id = ApplicationInstanceId::new("app-server-1");
/// let ie = app_id.to_ie();
/// assert_eq!(ie.ie_type, IeType::ApplicationInstanceId);
/// ```
pub fn to_ie(&self) -> Ie {
Ie::new(IeType::ApplicationInstanceId, self.marshal())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_application_instance_id_new() {
let app_id = ApplicationInstanceId::new("server-01");
assert_eq!(app_id.value(), "server-01");
}
#[test]
fn test_application_instance_id_value() {
let app_id = ApplicationInstanceId::new("cdn.example.com");
assert_eq!(app_id.value(), "cdn.example.com");
}
#[test]
fn test_application_instance_id_empty() {
let empty = ApplicationInstanceId::new("");
assert!(empty.is_empty());
assert_eq!(empty.value(), "");
let non_empty = ApplicationInstanceId::new("server");
assert!(!non_empty.is_empty());
}
#[test]
fn test_application_instance_id_marshal() {
let app_id = ApplicationInstanceId::new("test-server");
let bytes = app_id.marshal();
assert_eq!(bytes, b"test-server");
}
#[test]
fn test_application_instance_id_marshal_empty() {
let app_id = ApplicationInstanceId::new("");
let bytes = app_id.marshal();
assert!(bytes.is_empty());
}
#[test]
fn test_application_instance_id_unmarshal() {
let data = b"video-server-1";
let app_id = ApplicationInstanceId::unmarshal(data).unwrap();
assert_eq!(app_id.value(), "video-server-1");
}
#[test]
fn test_application_instance_id_unmarshal_empty() {
let data = b"";
let app_id = ApplicationInstanceId::unmarshal(data).unwrap();
assert!(app_id.is_empty());
}
#[test]
fn test_application_instance_id_unmarshal_invalid_utf8() {
let invalid_data = vec![0xFF, 0xFE, 0xFD]; // Invalid UTF-8
let result = ApplicationInstanceId::unmarshal(&invalid_data);
assert!(result.is_err());
let err = result.unwrap_err();
assert!(matches!(err, PfcpError::InvalidValue { .. }));
}
#[test]
fn test_application_instance_id_round_trip() {
let original = ApplicationInstanceId::new("app-instance-42");
let marshaled = original.marshal();
let unmarshaled = ApplicationInstanceId::unmarshal(&marshaled).unwrap();
assert_eq!(original, unmarshaled);
}
#[test]
fn test_application_instance_id_round_trip_empty() {
let original = ApplicationInstanceId::new("");
let marshaled = original.marshal();
let unmarshaled = ApplicationInstanceId::unmarshal(&marshaled).unwrap();
assert_eq!(original, unmarshaled);
}
#[test]
fn test_application_instance_id_to_ie() {
let app_id = ApplicationInstanceId::new("game-server");
let ie = app_id.to_ie();
assert_eq!(ie.ie_type, IeType::ApplicationInstanceId);
assert_eq!(ie.payload, b"game-server");
// Verify IE can be unmarshaled
let parsed = ApplicationInstanceId::unmarshal(&ie.payload).unwrap();
assert_eq!(app_id, parsed);
}
#[test]
fn test_application_instance_id_clone() {
let app_id1 = ApplicationInstanceId::new("server-1");
let app_id2 = app_id1.clone();
assert_eq!(app_id1, app_id2);
}
#[test]
fn test_application_instance_id_various_formats() {
// Test different identifier formats
let formats = vec![
"simple-id",
"server-01",
"app.example.com",
"192.168.1.10",
"server_with_underscore",
"UPPERCASE",
"MixedCase123",
"hyphen-separated-id",
];
for format in formats {
let app_id = ApplicationInstanceId::new(format);
let marshaled = app_id.marshal();
let unmarshaled = ApplicationInstanceId::unmarshal(&marshaled).unwrap();
assert_eq!(app_id, unmarshaled, "Failed for format: {}", format);
}
}
#[test]
fn test_application_instance_id_5g_scenarios() {
// Scenario 1: CDN server selection
let cdn_server = ApplicationInstanceId::new("cdn-edge-server-nyc-01");
assert_eq!(cdn_server.value(), "cdn-edge-server-nyc-01");
// Scenario 2: Gaming server instance
let game_server = ApplicationInstanceId::new("game.region-us-east.server-5");
assert_eq!(game_server.value(), "game.region-us-east.server-5");
// Scenario 3: Video streaming server
let video_server = ApplicationInstanceId::new("video-transcode-server-2");
assert_eq!(video_server.value(), "video-transcode-server-2");
// Scenario 4: IoT application instance
let iot_app = ApplicationInstanceId::new("iot-data-collector-v2");
assert_eq!(iot_app.value(), "iot-data-collector-v2");
}
#[test]
fn test_application_instance_id_unicode() {
// Test Unicode support (though typically ASCII in practice)
let unicode_id = ApplicationInstanceId::new("服务器-01");
let marshaled = unicode_id.marshal();
let unmarshaled = ApplicationInstanceId::unmarshal(&marshaled).unwrap();
assert_eq!(unicode_id, unmarshaled);
}
#[test]
fn test_application_instance_id_long_identifier() {
// Test with longer identifier
let long_id = ApplicationInstanceId::new(
"very-long-application-instance-identifier-with-many-components.subdomain.example.com",
);
let marshaled = long_id.marshal();
let unmarshaled = ApplicationInstanceId::unmarshal(&marshaled).unwrap();
assert_eq!(long_id, unmarshaled);
}
}