Add redis docker support

Signed-off-by: Michael Yuan <[email protected]>

.github/workflows/examples.yml

@@ -59,8 +59,8 @@ jobs:
         # sudo pg_ctlcluster 12 main start
         sudo systemctl start postgresql.service
         sleep 10
-        sudo createuser -w wasmedge 
-        sudo createdb -O wasmedge testdb
+        sudo -u postgres createuser -w wasmedge 
+        sudo -u postgres createdb -O wasmedge testdb
     
     - name: Install Anna KVS and run router
       run: |
@@ -139,7 +139,7 @@ jobs:
         cd redis
         cargo build --target wasm32-wasi --release
         wasmedgec target/wasm32-wasi/release/wasmedge-redis-client-examples.wasm wasmedge-redis-client-examples.wasm
-        resp=$(wasmedge wasmedge-redis-client-examples.wasm 2>&1)
+        resp=$(wasmedge --env "REDIS_URL=redis://localhost/" wasmedge-redis-client-examples.wasm 2>&1)
         echo "$resp"
         if [[ $resp == *"UTC"* ]]; then
           echo -e "Execution Success!"

redis/Dockerfile

@@ -0,0 +1,14 @@
+FROM --platform=$BUILDPLATFORM rust:1.64 AS buildbase
+RUN rustup target add wasm32-wasi
+WORKDIR /src
+
+FROM --platform=$BUILDPLATFORM buildbase AS buildclient
+COPY . /src
+RUN --mount=type=cache,target=/usr/local/cargo/git/db \
+    --mount=type=cache,target=/usr/local/cargo/registry/cache \
+    --mount=type=cache,target=/usr/local/cargo/registry/index \
+    cargo build --target wasm32-wasi --release
+
+FROM scratch AS client
+ENTRYPOINT [ "wasmedge-redis-client-examples.wasm" ]
+COPY --link --from=buildclient /src/target/wasm32-wasi/release/wasmedge-redis-client-examples.wasm  wasmedge-redis-client-examples.wasm

redis/README.md

@@ -4,5 +4,5 @@
 
 ```bash
 cargo build --target wasm32-wasi --release
-wasmedge target/wasm32-wasi/release/wasmedge-redis-client-examples.wasm
+wasmedge --env "REDIS_URL=redis://localhost/" target/wasm32-wasi/release/wasmedge-redis-client-examples.wasm
 ```

redis/docker-compose.yml

@@ -0,0 +1,17 @@
+services:
+  client:
+    image: demo-redis
+    platform: wasi/wasm
+    build:
+      context: .
+    environment:
+      REDIS_URL: redis://cache/
+      RUST_BACKTRACE: full
+    restart: on-failure
+    runtime: io.containerd.wasmedge.v1
+  cache:
+    image: redis:6.2-alpine
+    restart: always
+    ports:
+      - '6379:6379'
+    command: redis-server --save 20 1 --loglevel warning

redis/src/main.rs

@@ -1,10 +1,18 @@
 use redis::Commands;
 use anyhow::Result;
 
+fn get_url() -> String {
+    if let Ok(url) = std::env::var("REDIS_URL") {
+        url
+    } else {
+        "redis://127.0.0.1/".into()
+    }
+}
+
 #[tokio::main(flavor = "current_thread")]
 async fn main() -> Result<()> {
     // connect to redis
-    let client = redis::Client::open("redis://127.0.0.1/")?;
+    let client = redis::Client::open(&*get_url())?;
     let mut con = client.get_connection()?;
 
     let time = format!("{}", chrono::Utc::now());