devops: dockerize mcp server (#55)

* devops: Substitute GraphQL API for MCP server

* fix: MCP server bind address

* devops: Fix memcached healthcheck

Author: cvauclair

docker/Dockerfile

@@ -4,7 +4,7 @@ WORKDIR /kg-node
 COPY . .
 RUN apt-get update && apt-get upgrade -y
 RUN apt-get install libssl-dev protobuf-compiler -y
-RUN CFLAGS='-std=gnu17' cargo build --release --bin sink --bin api
+RUN CFLAGS='-std=gnu17' cargo build --release --bin sink --bin mcp-server
 
 # Run image
 FROM debian:bookworm-slim AS run
@@ -34,11 +34,20 @@ CMD ./sink \
     --neo4j-user $neo4j_user \
     --neo4j-pass $neo4j_pass
 
-# GraphQL API image
-FROM run AS api
-COPY --from=builder /kg-node/target/release/api .
+# # GraphQL API image
+# FROM run AS api
+# COPY --from=builder /kg-node/target/release/api .
 
-CMD ./api \
+# CMD ./api \
+#     --neo4j-uri $neo4j_uri \
+#     --neo4j-user $neo4j_user \
+#     --neo4j-pass $neo4j_pass
+
+# MCP server image
+FROM run AS mcp
+COPY --from=builder /kg-node/target/release/mcp-server .
+
+CMD ./mcp-server \
     --neo4j-uri $neo4j_uri \
     --neo4j-user $neo4j_user \
     --neo4j-pass $neo4j_pass

docker/docker-compose.yaml

@@ -1,10 +1,10 @@
 services:
   memcached:
-    image: memcached:latest
+    image: memcached:alpine
     ports:
       - "11211:11211"
     healthcheck:
-      test: echo "version" | (exec 3<>/dev/tcp/localhost/11211; cat >&3; timeout 0.1 cat <&3; exec 3<&-)
+      test: echo "version" | nc -vn -w 1 127.0.0.1 11211
       interval: 1s
       timeout: 10s
       retries: 20
@@ -53,11 +53,30 @@ services:
       SUBSTREAMS_START_BLOCK: ${SUBSTREAMS_START_BLOCK}
       memcached_uri: memcached:11211
       memcached_default_expiry: "3600"
-  api:
+  # api:
+  #   build:
+  #     context: ..
+  #     dockerfile: docker/Dockerfile
+  #     target: api
+  #   ports:
+  #     - "80:8080"
+  #   depends_on:
+  #     neo4j:
+  #       condition: service_healthy
+  #     memcached:
+  #       condition: service_healthy
+  #   environment:
+  #     neo4j_uri: neo4j://neo4j:7687
+  #     neo4j_user: neo4j
+  #     neo4j_pass: neo4j
+  #     memcached_uri: memcached:11211
+  #     memcached_default_expiry: "3600"
+
+  mcp:
     build:
       context: ..
       dockerfile: docker/Dockerfile
-      target: api
+      target: mcp
     ports:
       - "80:8080"
     depends_on:

mcp-server/src/main.rs

@@ -22,7 +22,7 @@ use tracing_subscriber::{
     {self},
 };
 
-const BIND_ADDRESS: &str = "127.0.0.1:8000";
+const BIND_ADDRESS: &str = "0.0.0.0:8080";
 
 #[tokio::main]
 async fn main() -> anyhow::Result<()> {