feat: enable having get variable from local setup

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/churn/src/agent/agent_state.rs

@@ -44,7 +44,7 @@ impl State {
         let config = AgentConfig::new().await?;
         let discovery = DiscoveryClient::new(&config.discovery).discover().await?;
         let grpc = GrpcClient::new(&discovery.process_host);
-        let plugin_store = PluginStore::new()?;
+        let plugin_store = PluginStore::new(config.clone())?;
         let scheduled_tasks = ScheduledTasks::new(plugin_store.clone());
         let scheduler = Scheduler::new(scheduled_tasks);
         let queue = AgentQueue::new(scheduler);

crates/churn/src/agent/config.rs

@@ -8,6 +8,8 @@ use uuid::Uuid;
 pub struct AgentConfig {
     pub agent_id: String,
     pub discovery: String,
+
+    pub labels: BTreeMap<String, String>,
 }
 
 impl AgentConfig {
@@ -17,6 +19,7 @@ impl AgentConfig {
         Ok(Self {
             agent_id: config.agent_id,
             discovery: config.discovery,
+            labels: config.labels.unwrap_or_default(),
         })
     }
 }

crates/churn/src/agent/plugins.rs

@@ -8,6 +8,9 @@ use wasmtime::component::*;
 use wasmtime::{Config, Engine, Store};
 use wasmtime_wasi::{DirPerms, FilePerms, WasiCtx, WasiCtxBuilder, WasiView};
 
+use super::agent_state::State;
+use super::config::AgentConfig;
+
 wasmtime::component::bindgen!({
     path: "wit/world.wit",
     //world: "churn",
@@ -17,9 +20,14 @@ wasmtime::component::bindgen!({
     }
 });
 
-#[derive(Default)]
-pub struct CustomProcess {}
+pub struct CustomProcess {
+    agent_config: AgentConfig,
+}
 impl CustomProcess {
+    pub fn new(agent_config: AgentConfig) -> Self {
+        Self { agent_config }
+    }
+
     pub fn run(&self, args: Vec<String>) -> String {
         tracing::info!("calling function");
 
@@ -42,6 +50,10 @@ impl CustomProcess {
             }
         }
     }
+
+    pub fn get_label(&self, label_key: &str) -> Option<String> {
+        self.agent_config.labels.get(label_key).cloned()
+    }
 }
 
 #[derive(Clone)]
@@ -50,9 +62,9 @@ pub struct PluginStore {
 }
 
 impl PluginStore {
-    pub fn new() -> anyhow::Result<Self> {
+    pub fn new(config: AgentConfig) -> anyhow::Result<Self> {
         Ok(Self {
-            inner: Arc::new(Mutex::new(InnerPluginStore::new()?)),
+            inner: Arc::new(Mutex::new(InnerPluginStore::new(config)?)),
         })
     }
 
@@ -74,7 +86,7 @@ pub struct InnerPluginStore {
 }
 
 impl InnerPluginStore {
-    pub fn new() -> anyhow::Result<Self> {
+    pub fn new(agent_config: AgentConfig) -> anyhow::Result<Self> {
         let mut config = Config::default();
         config.wasm_component_model(true);
         config.async_support(true);
@@ -89,7 +101,7 @@ impl InnerPluginStore {
             |state: &mut ServerWasiView| state,
         )?;
 
-        let wasi_view = ServerWasiView::new();
+        let wasi_view = ServerWasiView::new(agent_config);
         let store = Store::new(&engine, wasi_view);
 
         Ok(Self {
@@ -148,6 +160,12 @@ impl InnerPluginStore {
 
             let req = reqwest::get(format!("https://api-minio.front.kjuulh.io/churn-registry/{plugin_name}/{plugin_version}/{plugin_name}.wasm")).await.context("failed to get plugin from registry")?;
             let mut stream = req.bytes_stream();
+
+            tracing::info!(
+                plugin_name = plugin_name,
+                plugin_path = plugin_path.display().to_string(),
+                "writing plugin to file"
+            );
             let mut file = tokio::fs::File::create(&plugin_path).await?;
             while let Some(chunk) = stream.next().await {
                 let chunk = chunk?;
@@ -177,10 +195,11 @@ struct ServerWasiView {
     table: ResourceTable,
     ctx: WasiCtx,
     processes: ResourceTable,
+    agent_config: AgentConfig,
 }
 
 impl ServerWasiView {
-    fn new() -> Self {
+    fn new(agent_config: AgentConfig) -> Self {
         let table = ResourceTable::new();
 
         let ctx = WasiCtxBuilder::new()
@@ -197,6 +216,7 @@ impl ServerWasiView {
             table,
             ctx,
             processes: ResourceTable::default(),
+            agent_config,
         }
     }
 }
@@ -218,7 +238,9 @@ impl HostProcess for ServerWasiView {
     async fn new(
         &mut self,
     ) -> wasmtime::component::Resource<component::churn_tasks::process::Process> {
-        self.processes.push(CustomProcess::default()).unwrap()
+        self.processes
+            .push(CustomProcess::new(self.agent_config.clone()))
+            .unwrap()
     }
 
     async fn run_process(
@@ -230,6 +252,15 @@ impl HostProcess for ServerWasiView {
         process.run(inputs)
     }
 
+    async fn get_variable(
+        &mut self,
+        self_: wasmtime::component::Resource<component::churn_tasks::process::Process>,
+        key: wasmtime::component::__internal::String,
+    ) -> String {
+        let process = self.processes.get(&self_).unwrap();
+        process.get_label(&key).unwrap()
+    }
+
     async fn drop(
         &mut self,
         rep: wasmtime::component::Resource<component::churn_tasks::process::Process>,

crates/churn/wit/world.wit

@@ -4,6 +4,7 @@ interface process {
     resource process {
         constructor();
         run-process: func(inputs: list<string>) -> string;
+        get-variable: func(key: string) -> string;
     }
 }