Add stubbed-out values for remaining FASTLY_ environment variables.

lib/src/linking.rs

@@ -115,10 +115,17 @@ pub(crate) fn create_store(
 fn make_wasi_ctx(ctx: &ExecuteCtx, session: &Session) -> Result<WasiCtx, anyhow::Error> {
     let mut wasi_ctx = WasiCtxBuilder::new();
 
-    // Viceroy provides a subset of the `FASTLY_*` environment variables that the production
+    // Viceroy provides the same `FASTLY_*` environment variables that the production
     // Compute platform provides:
 
     wasi_ctx
+        // These variables are stubbed out for compatibility
+        .env("FASTLY_CACHE_GENERATION", "0")?
+        .env("FASTLY_CUSTOMER_ID", "0000000000000000000000")?
+        .env("FASTLY_POP", "XXX")?
+        .env("FASTLY_REGION", "Somewhere")?
+        .env("FASTLY_SERVICE_ID", "0000000000000000000000")?
+        .env("FASTLY_SERVICE_VERSION", "0")?
         // signal that we're in a local testing environment
         .env("FASTLY_HOSTNAME", "localhost")?
         // request IDs start at 0 and increment, rather than being UUIDs, for ease of testing

test-fixtures/src/bin/env-vars.rs

@@ -3,12 +3,34 @@
 use std::env;
 
 fn main() {
-    let host_name = env::var("FASTLY_HOSTNAME").expect("host name available");
-    assert_eq!(host_name, "localhost");
+    let id: u64 = env::var("FASTLY_CACHE_GENERATION")
+        .expect("cache generation available")
+        .parse()
+        .expect("parses as u64");
+
+    let sid = env::var("FASTLY_CUSTOMER_ID").expect("customer ID available");
+    assert_eq!(sid, "0000000000000000000000");
+
+    let sid = env::var("FASTLY_POP").expect("POP available");
+    assert_eq!(sid, "XXX");
+
+    let sid = env::var("FASTLY_REGION").expect("region available");
+    assert_eq!(sid, "Somewhere");
+
+    let sid = env::var("FASTLY_SERVICE_ID").expect("service ID available");
+    assert_eq!(sid, "0000000000000000000000");
+
+    let id: u64 = env::var("FASTLY_SERVICE_VERSION")
+        .expect("service version available")
+        .parse()
+        .expect("parses as u64");
 
     let id: u64 = env::var("FASTLY_TRACE_ID")
         .expect("trace ID available")
         .parse()
         .expect("parses as u64");
     assert_eq!(id, 0);
+
+    let host_name = env::var("FASTLY_HOSTNAME").expect("host name available");
+    assert_eq!(host_name, "localhost");
 }