refactor: Refactor health status code

crates/core/c8y_api/src/utils.rs

@@ -1,33 +1,3 @@
-pub mod bridge {
-    use mqtt_channel::MqttMessage;
-    use tedge_api::main_device_health_topic;
-    use tedge_api::MQTT_BRIDGE_DOWN_PAYLOAD;
-    use tedge_api::MQTT_BRIDGE_UP_PAYLOAD;
-
-    pub fn is_c8y_bridge_established(message: &MqttMessage, service: &str) -> bool {
-        let c8y_bridge_health_topic = main_device_health_topic(service);
-        match message.payload_str() {
-            Ok(payload) => {
-                message.topic.name == c8y_bridge_health_topic
-                    && (payload == MQTT_BRIDGE_UP_PAYLOAD
-                        || payload == MQTT_BRIDGE_DOWN_PAYLOAD
-                        || is_valid_status_payload(payload))
-            }
-            Err(_err) => false,
-        }
-    }
-
-    #[derive(serde::Deserialize)]
-    struct HealthStatus<'a> {
-        status: &'a str,
-    }
-
-    fn is_valid_status_payload(payload: &str) -> bool {
-        serde_json::from_str::<HealthStatus>(payload)
-            .map_or(false, |h| h.status == "up" || h.status == "down")
-    }
-}
-
 pub mod child_device {
     use crate::smartrest::topic::C8yTopic;
     use mqtt_channel::MqttMessage;
@@ -40,28 +10,3 @@ pub mod child_device {
         )
     }
 }
-
-#[cfg(test)]
-mod tests {
-    use mqtt_channel::MqttMessage;
-    use mqtt_channel::Topic;
-    use test_case::test_case;
-
-    use crate::utils::bridge::is_c8y_bridge_established;
-
-    const C8Y_BRIDGE_HEALTH_TOPIC: &str =
-        "te/device/main/service/tedge-mapper-bridge-c8y/status/health";
-
-    #[test_case(C8Y_BRIDGE_HEALTH_TOPIC, "1", true)]
-    #[test_case(C8Y_BRIDGE_HEALTH_TOPIC, "0", true)]
-    #[test_case(C8Y_BRIDGE_HEALTH_TOPIC, "bad payload", false)]
-    #[test_case("tedge/not/health/topic", "1", false)]
-    #[test_case("tedge/not/health/topic", "0", false)]
-    fn test_bridge_is_established(topic: &str, payload: &str, expected: bool) {
-        let topic = Topic::new(topic).unwrap();
-        let message = MqttMessage::new(&topic, payload);
-
-        let actual = is_c8y_bridge_established(&message, "tedge-mapper-bridge-c8y");
-        assert_eq!(actual, expected);
-    }
-}

crates/core/tedge_api/src/health.rs

@@ -1,25 +1,30 @@
 use crate::mqtt_topics::Channel;
+use crate::mqtt_topics::EntityTopicId;
 use crate::mqtt_topics::MqttSchema;
 use crate::mqtt_topics::ServiceTopicId;
 use clock::Clock;
 use clock::WallClock;
 use log::error;
 use mqtt_channel::MqttMessage;
 use mqtt_channel::Topic;
+use serde::Deserialize;
+use serde::Serialize;
 use serde_json::json;
+use serde_json::Value as JsonValue;
+use std::fmt::Display;
 use std::process;
 use std::sync::Arc;
 use tedge_utils::timestamp::TimeFormat;
 
-pub const MQTT_BRIDGE_UP_PAYLOAD: &str = "1";
-pub const MQTT_BRIDGE_DOWN_PAYLOAD: &str = "0";
-pub const UP_STATUS: &str = "up";
-pub const DOWN_STATUS: &str = "down";
-pub const UNKNOWN_STATUS: &str = "unknown";
-
-// FIXME: doesn't account for custom topic root, use MQTT scheme API here
-pub fn main_device_health_topic(service: &str) -> String {
-    format!("te/device/main/service/{service}/status/health")
+pub fn service_health_topic(
+    mqtt_schema: &MqttSchema,
+    device_topic_id: &EntityTopicId,
+    service: &str,
+) -> Topic {
+    mqtt_schema.topic_for(
+        &device_topic_id.default_service_for_device(service).unwrap(),
+        &Channel::Health,
+    )
 }
 
 /// Encodes a valid health topic.
@@ -92,14 +97,163 @@ impl ServiceHealthTopic {
     }
 }
 
+#[derive(Deserialize, Serialize, Debug, Default)]
+pub struct HealthStatus {
+    pub status: Status,
+    pub pid: Option<u32>,
+    pub time: Option<JsonValue>,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Deserialize, Serialize)]
+#[serde(rename_all = "lowercase")]
+pub enum Status {
+    Up,
+    Down,
+    #[serde(untagged)]
+    Other(String),
+}
+
+impl Default for Status {
+    fn default() -> Self {
+        Status::Other("unknown".to_string())
+    }
+}
+
+impl Display for Status {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let status = match self {
+            Status::Up => "up",
+            Status::Down => "down",
+            Status::Other(val) if val.is_empty() => "unknown",
+            Status::Other(val) => val,
+        };
+        write!(f, "{}", status)
+    }
+}
+
 #[derive(Debug)]
 pub struct HealthTopicError;
 
+impl HealthStatus {
+    pub fn try_from_health_status_message(
+        message: &MqttMessage,
+        mqtt_schema: &MqttSchema,
+    ) -> Result<Self, HealthTopicError> {
+        if let Ok((topic_id, Channel::Health)) = mqtt_schema.entity_channel_of(&message.topic) {
+            let health_status = if entity_is_mosquitto_bridge_service(&topic_id) {
+                let status = match message.payload_str() {
+                    Ok("1") => Status::Up,
+                    Ok("0") => Status::Down,
+                    _ => Status::default(),
+                };
+                HealthStatus {
+                    status,
+                    pid: None,
+                    time: None,
+                }
+            } else {
+                serde_json::from_slice(message.payload()).unwrap_or_default()
+            };
+            Ok(health_status)
+        } else {
+            Err(HealthTopicError)
+        }
+    }
+
+    pub fn is_valid(&self) -> bool {
+        self.status == Status::Up || self.status == Status::Down
+    }
+}
+
+pub fn entity_is_mosquitto_bridge_service(entity_topic_id: &EntityTopicId) -> bool {
+    entity_topic_id
+        .default_service_name()
+        .filter(|name| name.starts_with("mosquitto-") && name.ends_with("-bridge"))
+        .is_some()
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
     use assert_matches::assert_matches;
     use serde_json::Value;
+    use test_case::test_case;
+
+    #[test_case(
+        "te/device/main/service/tedge-mapper-c8y/status/health",
+        r#"{"status":"up"}"#,
+        Status::Up;
+        "service-health-status-up"
+    )]
+    #[test_case(
+        "te/device/main/service/tedge-mapper-c8y/status/health",
+        r#"{"status":"down"}"#,
+        Status::Down;
+        "service-health-status-down"
+    )]
+    #[test_case(
+        "te/device/main/service/tedge-mapper-c8y/status/health",
+        r#"{"status":"foo"}"#,
+        Status::Other("foo".into());
+        "service-health-status-other-value"
+    )]
+    #[test_case(
+        "te/device/child/service/tedge-mapper-c8y/status/health",
+        r#"{"pid":1234,"status":"up"}"#,
+        Status::Up;
+        "service-health-status-with-extra-fields"
+    )]
+    #[test_case(
+        "te/device/main/service/tedge-mapper-c8y/status/health",
+        r#"{"pid":"123456"}"#,
+        Status::Other("unknown".into());
+        "service-health-status-no-value"
+    )]
+    #[test_case(
+        "te/device/main/service/tedge-mapper-c8y/status/health",
+        r#"{"status":""}"#,
+        Status::Other("".into());
+        "service-health-status-empty-value"
+    )]
+    #[test_case(
+        "te/device/main/service/tedge-mapper-c8y/status/health",
+        "{}",
+        Status::default();
+        "service-health-status-empty-message"
+    )]
+    #[test_case(
+        "te/device/main/service/mosquitto-xyz-bridge/status/health",
+        "1",
+        Status::Up;
+        "mosquitto-bridge-service-health-status-up"
+    )]
+    #[test_case(
+        "te/device/main/service/mosquitto-xyz-bridge/status/health",
+        "0",
+        Status::Down;
+        "mosquitto-bridge-service-health-status-down"
+    )]
+    #[test_case(
+        "te/device/main/service/mosquitto-xyz-bridge/status/health",
+        "invalid payload",
+        Status::default();
+        "mosquitto-bridge-service-health-status-invalid-payload"
+    )]
+    #[test_case(
+        "te/device/main/service/tedge-mapper-bridge-c8y/status/health",
+        r#"{"status":"up"}"#,
+        Status::Up;
+        "builtin-bridge-service-health-status-up"
+    )]
+    fn parse_heath_status(health_topic: &str, health_payload: &str, expected_status: Status) {
+        let mqtt_schema = MqttSchema::new();
+        let topic = Topic::new_unchecked(health_topic);
+        let health_message = MqttMessage::new(&topic, health_payload.as_bytes().to_owned());
+
+        let health_status =
+            HealthStatus::try_from_health_status_message(&health_message, &mqtt_schema);
+        assert_eq!(health_status.unwrap().status, expected_status);
+    }
 
     #[test]
     fn is_rfc3339_timestamp() {

crates/core/tedge_api/src/mqtt_topics.rs

@@ -427,12 +427,6 @@ impl EntityTopicId {
     pub fn as_str(&self) -> &str {
         self.0.as_str()
     }
-
-    // FIXME: can also match "device/bridge//" or "/device/main/service/my_custom_bridge"
-    // should match ONLY the single mapper bridge
-    pub fn is_bridge_health_topic(&self) -> bool {
-        self.as_str().contains("bridge")
-    }
 }
 
 /// Contains a topic id of the service itself and the associated device.

crates/core/tedge_mapper/src/aws/mapper.rs

@@ -4,18 +4,22 @@ use async_trait::async_trait;
 use aws_mapper_ext::converter::AwsConverter;
 use clock::WallClock;
 use mqtt_channel::TopicFilter;
+use std::str::FromStr;
 use tedge_actors::ConvertingActor;
 use tedge_actors::MessageSink;
 use tedge_actors::MessageSource;
 use tedge_actors::NoConfig;
+use tedge_api::mqtt_topics::EntityTopicId;
 use tedge_api::mqtt_topics::MqttSchema;
+use tedge_api::service_health_topic;
 use tedge_config::TEdgeConfig;
 use tedge_mqtt_bridge::use_key_and_cert;
 use tedge_mqtt_bridge::BridgeConfig;
 use tedge_mqtt_bridge::MqttBridgeActorBuilder;
 use tracing::warn;
 
 const AWS_MAPPER_NAME: &str = "tedge-mapper-aws";
+const BUILT_IN_BRIDGE_NAME: &str = "tedge-mapper-bridge-aws";
 
 pub struct AwsMapper;
 
@@ -32,8 +36,12 @@ impl TEdgeComponent for AwsMapper {
     ) -> Result<(), anyhow::Error> {
         let (mut runtime, mut mqtt_actor) =
             start_basic_actors(self.session_name(), &tedge_config).await?;
+
+        let mqtt_schema = MqttSchema::with_root(tedge_config.mqtt.topic_root.clone());
         if tedge_config.mqtt.bridge.built_in {
             let device_id = tedge_config.device.id.try_read(&tedge_config)?;
+            let device_topic_id = EntityTopicId::from_str(&tedge_config.mqtt.device_topic_id)?;
+
             let rules = built_in_bridge_rules(device_id)?;
 
             let mut cloud_config = tedge_mqtt_bridge::MqttOptions::new(
@@ -47,17 +55,21 @@ impl TEdgeComponent for AwsMapper {
                 &tedge_config.aws.root_cert_path,
                 &tedge_config,
             )?;
+
+            let health_topic =
+                service_health_topic(&mqtt_schema, &device_topic_id, BUILT_IN_BRIDGE_NAME);
+
             let bridge_actor = MqttBridgeActorBuilder::new(
                 &tedge_config,
-                "tedge-mapper-bridge-aws".to_owned(),
+                BUILT_IN_BRIDGE_NAME,
+                &health_topic,
                 rules,
                 cloud_config,
             )
             .await;
             runtime.spawn(bridge_actor).await?;
         }
         let clock = Box::new(WallClock);
-        let mqtt_schema = MqttSchema::with_root(tedge_config.mqtt.topic_root.clone());
         let aws_converter = AwsConverter::new(
             tedge_config.aws.mapper.timestamp,
             clock,

crates/core/tedge_mapper/src/az/mapper.rs

@@ -4,18 +4,22 @@ use async_trait::async_trait;
 use az_mapper_ext::converter::AzureConverter;
 use clock::WallClock;
 use mqtt_channel::TopicFilter;
+use std::str::FromStr;
 use tedge_actors::ConvertingActor;
 use tedge_actors::MessageSink;
 use tedge_actors::MessageSource;
 use tedge_actors::NoConfig;
+use tedge_api::mqtt_topics::EntityTopicId;
 use tedge_api::mqtt_topics::MqttSchema;
+use tedge_api::service_health_topic;
 use tedge_config::TEdgeConfig;
 use tedge_mqtt_bridge::use_key_and_cert;
 use tedge_mqtt_bridge::BridgeConfig;
 use tedge_mqtt_bridge::MqttBridgeActorBuilder;
 use tracing::warn;
 
 const AZURE_MAPPER_NAME: &str = "tedge-mapper-az";
+const BUILT_IN_BRIDGE_NAME: &str = "tedge-mapper-bridge-az";
 
 pub struct AzureMapper;
 
@@ -32,7 +36,11 @@ impl TEdgeComponent for AzureMapper {
     ) -> Result<(), anyhow::Error> {
         let (mut runtime, mut mqtt_actor) =
             start_basic_actors(self.session_name(), &tedge_config).await?;
+        let mqtt_schema = MqttSchema::with_root(tedge_config.mqtt.topic_root.clone());
+
         if tedge_config.mqtt.bridge.built_in {
+            let device_topic_id = EntityTopicId::from_str(&tedge_config.mqtt.device_topic_id)?;
+
             let remote_clientid = tedge_config.device.id.try_read(&tedge_config)?;
             let rules = built_in_bridge_rules(remote_clientid)?;
 
@@ -55,9 +63,13 @@ impl TEdgeComponent for AzureMapper {
                 &tedge_config,
             )?;
 
+            let health_topic =
+                service_health_topic(&mqtt_schema, &device_topic_id, BUILT_IN_BRIDGE_NAME);
+
             let bridge_actor = MqttBridgeActorBuilder::new(
                 &tedge_config,
-                "tedge-mapper-bridge-az".to_owned(),
+                BUILT_IN_BRIDGE_NAME,
+                &health_topic,
                 rules,
                 cloud_config,
             )