build: update build process for tcp-metrics example

- update the build rule to use wasm-pack for optimized binaries
- update dockerfile and makefile to mount docker volume according to
 build rule
- add wasm-bindgen dependency

Signed-off-by: Rudraksh Pareek <[email protected]>

tcp-metrics/Cargo.toml

@@ -10,4 +10,5 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-proxy-wasm = "0.1.0"
+proxy-wasm = "0.1.0"
+wasm-bindgen = "0.2"

tcp-metrics/Makefile

@@ -1,16 +1,26 @@
-build:
+# check wether compiled with wasm-pack
+ifeq ($(shell test -e ./pkg/tcp_metrics_bg.wasm && echo -n y),y)
+	WASM_PATH=./pkg/tcp_metrics_bg.wasm
+endif
+
+# a small optimized binary without debug info, useful for releases
+build: clean
+	wasm-pack build --release
+
+build-unoptimized: clean
 	cargo +nightly build --target=wasm32-unknown-unknown --release 
 
 deploy:
-	docker-compose up --build --remove-orphans
+	WASM_PATH=$(WASM_PATH) docker-compose up --build --remove-orphans
 
 # shows only the logs related to WASM filter/singleton
 deploy-filtered:
-	docker-compose up --build --remove-orphans | grep "\[wasm\]\|Starting"
+	WASM_PATH=$(WASM_PATH) docker-compose up --build --remove-orphans | grep "\[wasm\]\|Starting"
 
 run: build deploy
 
 run-filtered: build deploy-filtered
 
 clean:
-	cargo clean
+	cargo clean
+	rm -rf ./pkg

tcp-metrics/docker-compose.yaml

@@ -7,7 +7,7 @@ services:
       dockerfile: envoy.Dockerfile
     volumes:
       - ./envoy.yaml:/etc/envoy.yaml
-      - ./target/wasm32-unknown-unknown/release/tcp_metrics.wasm:/etc/tcp_metrics.wasm
+      - ${WASM_PATH:-./target/wasm32-unknown-unknown/release/tcp_metrics.wasm}:/etc/tcp_metrics.wasm
     networks:
       - envoymesh
     expose:
@@ -31,4 +31,4 @@ services:
       - "18080:5678"
 
 networks:
-  envoymesh: {}
+  envoymesh: {}