sync from monorepo @ 2452e92e

crates/dirigent_langfuse/src/factory.rs

@@ -0,0 +1,48 @@
+//! Phase 4: factory that builds a stub `LangfuseStream`. Task 22 upgrades
+//! it to read credentials from params and construct a real client.
+
+use std::sync::Arc;
+
+use async_trait::async_trait;
+
+use dirigent_core::sharing::{StreamBuildError, StreamConfig, StreamFactory};
+use dirigent_protocol::streaming::SessionStream;
+
+use crate::client::{LangfuseConfig, LangfuseStream};
+
+pub struct LangfuseFactory;
+
+#[async_trait]
+impl StreamFactory for LangfuseFactory {
+    fn kind(&self) -> &'static str { "langfuse" }
+
+    async fn build(&self, cfg: &StreamConfig) -> Result<Arc<dyn SessionStream>, StreamBuildError> {
+        // Parse params. Required fields:
+        //   host:       String (URL)
+        //   public_key: String
+        //   secret_key: String
+        //
+        // Phase 4 stub: parse-or-fail, then construct LangfuseStream with
+        // the parsed config. Task 22 uses the host to build a reqwest client.
+
+        let host = cfg.params
+            .get("host").and_then(|v| v.as_str())
+            .ok_or_else(|| StreamBuildError::Config("missing `host` (url string)".into()))?;
+        let public_key = cfg.params
+            .get("public_key").and_then(|v| v.as_str())
+            .ok_or_else(|| StreamBuildError::Config("missing `public_key`".into()))?;
+        let secret_key = cfg.params
+            .get("secret_key").and_then(|v| v.as_str())
+            .ok_or_else(|| StreamBuildError::Config("missing `secret_key`".into()))?;
+
+        let lf_cfg = LangfuseConfig {
+            host: host.to_string(),
+            public_key: public_key.to_string(),
+            secret_key: secret_key.to_string(),
+        };
+
+        let stream = LangfuseStream::new(cfg.name.clone(), lf_cfg, cfg.scope.clone())
+            .map_err(|e| StreamBuildError::Transport(e.to_string()))?;
+        Ok(stream as Arc<dyn SessionStream>)
+    }
+}