feat: allow option per-stream

configs/config.toml

@@ -23,7 +23,7 @@ max_stream_count = 10
 # All streams will first push the latest packet before pushing historical data in
 # FIFO order, defaults to false. This solves the problem of bad networks leading to
 # data being pushed so slow that it is practically impossible to track the device.
-live_data_first = true
+default_live_data_first = true
 
 # MQTT client configuration
 #
@@ -89,13 +89,19 @@ blacklist = ["cancollector_metrics", "candump_metrics", "pinger"]
 #   used when there is a network/system failure.
 # - priority(optional, u8): Higher prioirity streams get to push their data
 #   onto the network first.
+# - live_data_first(optional, bool): All streams will first push the latest packet
+#   before pushing historical data in FIFO order, defaults to false. This solves the
+#   problem of bad networks leading to data being pushed so slow that it is practically
+#   impossible to track the device.
 #
 # In the following config for the device_shadow stream we set batch_size to 1 and mark
-# it as non-persistent. streams are internally constructed as a map of Name -> Config
+# it as non-persistent, also setting up live_data_first to enable quick delivery of stats.
+# Streams are internally constructed as a map of Name -> Config
 [streams.device_shadow]
 topic = "/tenants/{tenant_id}/devices/{device_id}/events/device_shadow/jsonarray"
 flush_period = 5
 priority = 75
+live_data_first = true
 
 # Example using compression
 [streams.imu]

uplink/src/base/serializer/mod.rs

@@ -233,7 +233,7 @@ impl StorageHandler {
             let mut storage = Storage::new(
                 &stream_config.topic,
                 stream_config.persistence.max_file_size,
-                config.live_data_first,
+                stream_config.live_data_first,
             );
             if stream_config.persistence.max_file_count > 0 {
                 let mut path = config.persistence_path.clone();
@@ -264,7 +264,7 @@ impl StorageHandler {
                 Storage::new(
                     &stream.topic,
                     self.config.default_buf_size,
-                    self.config.live_data_first,
+                    self.config.default_live_data_first,
                 )
             })
             .write(publish)

uplink/src/config.rs

@@ -93,6 +93,8 @@ pub struct StreamConfig {
     pub persistence: Persistence,
     #[serde(default)]
     pub priority: u8,
+    #[serde(default)]
+    pub live_data_first: bool,
 }
 
 impl Default for StreamConfig {
@@ -104,6 +106,7 @@ impl Default for StreamConfig {
             compression: Compression::Disabled,
             persistence: Persistence::default(),
             priority: 0,
+            live_data_first: false,
         }
     }
 }
@@ -537,7 +540,7 @@ pub struct Config {
     pub precondition_checks: Option<PreconditionCheckerConfig>,
     pub bus: Option<BusConfig>,
     #[serde(default)]
-    pub live_data_first: bool,
+    pub default_live_data_first: bool,
 }
 
 impl Config {

uplink/tests/serializer.rs

@@ -223,7 +223,6 @@ async fn prefer_live_data() {
     let mut config = Config::default();
     config.default_buf_size = 1024 * 1024;
     config.mqtt.max_packet_size = 1024 * 1024;
-    config.live_data_first = true;
     let config = Arc::new(config);
     let (data_tx, data_rx) = bounded(0);
     let (net_tx, req_rx) = bounded(0);
@@ -237,7 +236,12 @@ async fn prefer_live_data() {
     spawn(async {
         let mut default = MockCollector::new(
             "default",
-            StreamConfig { topic: "topic/default".to_owned(), batch_size: 1, ..Default::default() },
+            StreamConfig {
+                topic: "topic/default".to_owned(),
+                batch_size: 1,
+                live_data_first: true,
+                ..Default::default()
+            },
             data_tx,
         );
         for i in 0.. {