Support Cloudflare Worker deployment (#1081)

- Compile Exograph to WebAssembly with Cloudflare-specific platform APIs.
- Introduce a new `exo deploy cf-worker` command
- Introduce exo-env crate to abstract the concept of retrieving values from the system environment or a provided map (and may be extended to other sources in the future).
- Use DATABASE_URL as a fallback to EXO_POSTGRES_URL. 
- Drop the `EXO_POSTGRES_USER` and `EXO_POSTGRES_PASSWORD` environment (instead relying on the database URL to contain the user and password).

.github/workflows/build-binaries.yml

@@ -15,6 +15,7 @@ on:
  branches: ["main"]
  tags:
  - "*"
+ pull_request: # temporary to test cf-worker build without merging
 
 jobs:
  # Build and package all the things
@@ -159,3 +160,41 @@ jobs:
  asset_name: exograph-${{ env.ARCH }}.zip
  tag: ${{ github.ref }}
  prerelease: true
+
+ build-cf-worker:
+ runs-on: ubuntu-latest
+ steps:
+ - uses: actions/checkout@v4
+ - name: Clear up some disk space from the runner
+ run: |
+ bash ${PWD}/.github/workflows/clear-disk-space.sh
+
+ - name: Add target
+ run: rustup target add wasm32-unknown-unknown
+
+ - uses: Swatinem/rust-cache@v2
+ with:
+ key: wasm32-unknown-unknown
+ save-if: ${{ github.ref == 'refs/heads/main' }}
+
+ - name: Install wasm-pack
+ run: cargo install wasm-pack
+
+ - name: Build and package
+ run: sh ./build-cf-worker.sh
+
+ - name: Upload Artifacts
+ uses: actions/upload-artifact@v4
+ with:
+ name: exograph-cf-worker-wasm.zip
+ path: target/exograph-cf-worker-wasm.zip
+
+ - name: Upload zip to release
+ if: startsWith(github.ref, 'refs/tags/')
+ uses: svenstaro/upload-release-action@v2
+ with:
+ repo_token: ${{ secrets.GITHUB_TOKEN }}
+ file: target/exograph-cf-worker-wasm.zip
+ asset_name: exograph-cf-worker-wasm.zip
+ tag: ${{ github.ref }}
+ prerelease: true

Cargo.toml

@@ -10,6 +10,7 @@ members = [
  "crates/resolver",
  "crates/server-actix",
  "crates/server-aws-lambda",
+ "crates/server-cf-worker",
  "crates/server-common",
  "crates/testing",
  "crates/core-subsystem/*",
@@ -74,13 +75,12 @@ heck = "0.4.0"
 include_dir = "0.7.2"
 indexmap = "2.0.1"
 insta = { version = "1.31.0", features = ["redactions", "yaml"] }
-jsonwebtoken = "9.2.0"
+jsonwebtoken = "9.3.0"
 lazy_static = "1.4.0"
 maybe-owned = "0.3.4"
 rand = "0.8"
 regex = "1"
-reqwest = { version = "0.11.4", default-features = false, features = [
- "stream",
+reqwest = { version = "0.11.20", default-features = false, features = [
  "rustls-tls-native-roots",
 ] }
 serde = { version = "1.0", features = ["derive"] }
@@ -117,6 +117,9 @@ postgres-types = { git = "https://github.com/exograph/rust-postgres", branch = "
 debug = 1
 
 [profile.release]
-lto = "thin"
+lto = true
 codegen-units = 1
 strip = true
+
+[profile.release.package.server-cf-worker]
+opt-level = "s" # optimize for size in release builds

build-cf-worker.sh

@@ -0,0 +1,10 @@
+(cd crates/server-cf-worker && wasm-pack build --target bundler --out-name exograph_cf_worker)
+
+mkdir -p target/cf-worker-dist
+cp crates/server-cf-worker/pkg/*.wasm target/cf-worker-dist
+cp crates/server-cf-worker/pkg/*.js target/cf-worker-dist
+cp crates/server-cf-worker/js/exograph_cf_worker.js target/cf-worker-dist
+cp crates/server-cf-worker/js/index.js target/cf-worker-dist
+cp LICENSE target/cf-worker-dist
+(cd target/cf-worker-dist/ && zip ../exograph-cf-worker-wasm.zip *)
+