Pond: add healthcheck 👩🏽‍⚕️ (#112)

* add healthcheck to container

* print version

* add ping route

* Update version

* mount route

* update docker-compose, add autoheal image

* Use depends_on

cloud_images/docker-compose.yml

@@ -3,12 +3,21 @@ services:
   pond:
     image: "prawnalith/pond:latest"
     build: "pond/."
+    labels:
+      autoheal: "true"
     ports:
       - "443:8000"
     volumes:
       - "/var/volumes/pond:/data"
     depends_on:
       - "redis"
+  autoheal:
+    image: "willfarrell/autoheal"
+    volumes:
+      - "/var/run/docker.sock:/var/run/docker.sock"
+    restart: always
+    depends_on:
+      - pond
   redis:
     image: "redis"
     volumes:

cloud_images/pond/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "pond"
-version = "0.4.2"
+version = "0.4.3"
 authors = ["Terkwood <[email protected]>"]
 edition = "2018"
 

cloud_images/pond/Dockerfile

@@ -23,12 +23,14 @@ RUN cargo build --release
 
 # Now, we need to build our _real_ Docker container, copying in `pond`.
 FROM alpine:latest
-RUN apk --no-cache add ca-certificates
+RUN apk --no-cache add ca-certificates curl
 COPY --from=builder \
     /home/rust/src/target/x86_64-unknown-linux-musl/release/pond \
     /usr/local/bin/
 
 # .env, Rocket.toml, etc will be mounted here
 WORKDIR /data
 
+HEALTHCHECK CMD curl --fail --insecure https://0.0.0.0:8000/ping || exit 1
+
 CMD [ "/usr/local/bin/pond" ]

cloud_images/pond/src/bin/pond.rs

@@ -8,7 +8,12 @@ use pond::web;
 use std::process;
 use std::thread;
 
+const NAME: &'static str = env!("CARGO_PKG_NAME");
+const VERSION: &'static str = env!("CARGO_PKG_VERSION");
+
 fn main() {
+    println!("🔢 {:<8} {}", NAME, VERSION);
+
     dotenv::dotenv().expect("Unable to load .env file");
 
     let config = Config::new();

cloud_images/pond/src/web.rs

@@ -165,11 +165,16 @@ pub fn push_redis(data: Json<PushData>, conn: RedisDbConn, config: State<Config>
     }
 }
 
+#[get("/ping")]
+pub fn ping() -> Status {
+    Status::NoContent
+}
+
 pub fn startup(config: Config) {
     rocket::ignite()
         .manage(config)
         .attach(RedisDbConn::fairing())
-        .mount("/", routes![tanks, tanks_options, push_redis])
+        .mount("/", routes![tanks, tanks_options, push_redis, ping])
         .launch();
 }