Initial commit

Author: yoshuawuyts

.github/workflows/publish.yml

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+name: Build and publish a Wasm Component to GitHub Artifacts
+
+on:
+  push:
+    tags:
+      - v*
+  workflow_dispatch:
+
+env:
+  IMAGE_NAME: ${{ github.repository }}
+  CARGO_COMPONENT_VERSION: "0.16.0"
+  COMPONENT_NAME: udp-echo-server
+  COMPONENT_NAME_UNDERSCORED: udp_echo_server
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write
+      packages: write
+      contents: read
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Install cargo-binstall
+        uses: cargo-bins/cargo-binstall@v1.10.15
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.actor }}/{{ env.COMPONENT_NAME }}
+          tags: |
+            type=semver,pattern={{version}}
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Install cosign
+        if: github.event_name != 'workflow_dispatch'
+        uses: sigstore/cosign-installer@v3.7.0
+
+      - name: Cache cargo bin
+        id: cache-cargo
+        uses: actions/cache@v3
+        env:
+          cache-name: cache-cargo-bin
+        with:
+          path: ~/.cargo/bin
+          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('scripts/install.sh') }}
+          restore-keys: |
+            ${{ runner.os }}-build-${{ env.cache-name }}-
+            ${{ runner.os }}-build-
+            ${{ runner.os }}-
+
+      - if: ${{ steps.cache-cargo.outputs.cache-hit != 'true' }}
+        name: Install build dependencies
+        continue-on-error: false
+        run: |
+          cargo binstall cargo-component --force --version ${{ env.CARGO_COMPONENT_VERSION }}
+          cargo binstall wkg --force 
+          cargo binstall cargo-auditable cargo-audit
+
+      - name: Build the component
+        run: cargo auditable component build --release
+
+      - name: Publish `:<version>` to GitHub Container Registry
+        if: github.event_name != 'workflow_dispatch'
+        id: publish_versioned
+        uses: bytecodealliance/wkg-github-action@v5
+        with:
+          file: target/wasm32-wasip1/release/${{ env.COMPONENT_NAME_UNDERSCORED }}.wasm
+          oci-reference-without-tag: ghcr.io/${{ env.IMAGE_NAME }}/${{ env.COMPONENT_NAME }}
+          version: ${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.version'] }}
+
+      - name: Sign the versioned wasm component
+        if: github.event_name != 'workflow_dispatch'
+        run: cosign sign --yes ghcr.io/${{ env.IMAGE_NAME }}/${{ env.COMPONENT_NAME }}@${{ steps.publish_versioned.outputs.digest }}
+
+      - name: Publish `:latest` release to GitHub Container Registry
+        if: github.event_name != 'workflow_dispatch'
+        id: publish_latest
+        uses: bytecodealliance/wkg-github-action@v5
+        with:
+          file: target/wasm32-wasip1/release/${{ env.COMPONENT_NAME_UNDERSCORED }}.wasm
+          oci-reference-without-tag: ghcr.io/${{ env.IMAGE_NAME }}/${{ env.COMPONENT_NAME }}
+          version: latest
+
+      - name: Sign the latest wasm component
+        if: github.event_name != 'workflow_dispatch'
+        run: cosign sign --yes ghcr.io/${{ env.IMAGE_NAME }}/${{ env.COMPONENT_NAME }}@${{ steps.publish_latest.outputs.digest }}
+

.gitignore

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+target

.vscode/settings.json

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+{
+    "rust-analyzer.check.overrideCommand": [
+        "cargo",
+        "component",
+        "check",
+        "--workspace",
+        "--all-targets",
+        "--message-format=json"
+    ],
+}

Cargo.lock

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+[package]
+name = "udp-echo-server"
+version = "0.1.0"
+edition = "2021"
+authors = ["Yosh Wuyts <pub@yosh.is>"]
+description = "A sample UDP echo server for Wasm"
+documentation = "https://github.com/yoshuawuyts/wasm-udp-echo-sample"
+
+[package.metadata.component]
+package = "component:udp-echo-server"
+
+[package.metadata.component.dependencies]
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+wit-bindgen-rt = { version = "0.41.0", features = ["bitflags"] }
+
+[package.metadata.component.target.dependencies]
+"wasi:io" = { path = "wit/deps/io" }
+"wasi:cli" = { path = "wit/deps/cli" }
+"wasi:sockets" = { path = "wit/deps/sockets" }

Cargo.toml

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+# Wasm UDP Echo Example
+
+## Dependencies
+
+```bash
+cargo install cargo-component  # to build the project
+cargo install wit-bindgen-cli  # to generate the guest bindings
+cargo install wasm-tools       # to get data from the wasm artifacts
+cargo install wac              # to link and create the stubs
+```
+
+## Run Instructions
+
+```bash
+cargo component build
+wasmtime run -Sinherit-network target/wasm32-wasip1/debug/udp_echo_server.wasm
+```