proxy: recover from panic in Process.statusUpdate (#378)

Process.statusUpdate() panics when it can not write data, usually from a
client disconnect. Since it runs in a goroutine and did not have a
recover() the result was a crash.

ref: https://github.com/mostlygeek/llama-swap/discussions/326#discussioncomment-14856197

docker/llama-swap.Containerfile

@@ -2,7 +2,29 @@ ARG BASE_TAG=server-cuda
 FROM ghcr.io/ggml-org/llama.cpp:${BASE_TAG}
 
 # has to be after the FROM
-ARG LS_VER=89
+ARG LS_VER=170
+
+# Set default UID/GID arguments
+ARG UID=10001
+ARG GID=10001
+ARG USER_HOME=/app
+
+# Add user/group
+ENV HOME=$USER_HOME
+RUN if [ $UID -ne 0 ]; then \
+      if [ $GID -ne 0 ]; then \
+        addgroup --system --gid $GID app; \
+      fi; \
+      adduser --system --no-create-home --uid $UID --gid $GID \
+      --home $USER_HOME app; \
+    fi
+
+# Handle paths
+RUN mkdir --parents $HOME /app
+RUN chown --recursive $UID:$GID $HOME /app
+
+# Switch user
+USER $UID:$GID
 
 WORKDIR /app
 RUN \
@@ -10,7 +32,7 @@ RUN \
     tar -zxf llama-swap_"${LS_VER}"_linux_amd64.tar.gz && \
     rm llama-swap_"${LS_VER}"_linux_amd64.tar.gz
 
-COPY config.example.yaml /app/config.yaml
+COPY --chown=$UID:$GID config.example.yaml /app/config.yaml
 
 HEALTHCHECK CMD curl -f http://localhost:8080/ || exit 1
 ENTRYPOINT [ "/app/llama-swap", "-config", "/app/config.yaml" ]

proxy/process.go

@@ -733,6 +733,14 @@ func (s *statusResponseWriter) statusUpdates(ctx context.Context) {
 	s.wg.Add(1)
 	defer s.wg.Done()
 
+	// Recover from panics caused by client disconnection
+	// Note: recover() only works within the same goroutine, so we need it here
+	defer func() {
+		if r := recover(); r != nil {
+			s.process.proxyLogger.Debugf("<%s> statusUpdates recovered from panic (likely client disconnect): %v", s.process.ID, r)
+		}
+	}()
+
 	defer func() {
 		duration := time.Since(s.start)
 		s.sendLine(fmt.Sprintf("\nDone! (%.2fs)", duration.Seconds()))