Examples for the new Rust tutorial on inter-canister calls #1069

Examples for the new Rust tutorial on inter-canister calls

Author: oggy-dfin

.github/CODEOWNERS

@@ -59,11 +59,11 @@
 /rust/hello/ @dfinity/sdk
 /rust/icp_transfer/ @dfinity/growth
 /rust/image-classification/ @dfinity/execution
+/rust/inter-canister-calls/ @dfinity/ic-message-routing-owners
 /rust/nft-wallet/ @dfinity/growth
 /rust/parallel_calls/ @dfinity/research
 /rust/performance_counters/ @dfinity/execution
 /rust/periodic_tasks/ @dfinity/execution
-/rust/pub-sub/ @dfinity/growth
 /rust/qrcode/ @dfinity/execution
 /rust/query_stats/ @dfinity/consensus
 /rust/send_http_get/ @dfinity/growth

.github/workflows/rust-pub-sub-example.yml renamed to .github/workflows/rust-inter-canister-calls.yaml

@@ -1,47 +1,44 @@
-# Known failure: https://dfinity.atlassian.net/browse/EM-6
-name: rust-pub-sub
+name: rust-inter-canister-calls
 on:
   push:
     branches:
       - master
   pull_request:
     paths:
-      - rust/pub-sub/**
+      - rust/inter-canistert-calls/**
       - .github/workflows/provision-darwin.sh
       - .github/workflows/provision-linux.sh
-      - .github/workflows/rust-pub-sub-example.yml
+      - .github/workflows/rust-inter-canister-calls-example.yml
       - .ic-commit
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 jobs:
-  rust-pub-sub-darwin:
+  rust-inter-canister-calls-darwin:
     runs-on: macos-15
     steps:
       - uses: actions/checkout@v2
         with:
           submodules: recursive
       - name: Provision Darwin
         run: bash .github/workflows/provision-darwin.sh
-      - name: Rust Pub-Sub Darwin
+      - name: Rust Parallel-Calls Darwin
         run: |
-          pushd rust/pub-sub
+          pushd rust/inter-canister-calls
           dfx start --background
-          make install
           make test
           popd
-  rust-pub-sub-linux:
+  rust-inter-canister-calls-linux:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
         with:
           submodules: recursive
       - name: Provision Linux
         run: bash .github/workflows/provision-linux.sh
-      - name: Rust Pub-Sub Linux
+      - name: Rust Parallel-Calls Linux
         run: |
-          pushd rust/pub-sub
+          pushd rust/inter-canister-calls
           dfx start --background
-          make install
           make test
           popd

rust/counter/src/lib.rs

@@ -18,6 +18,15 @@ fn set(n: Nat) {
     COUNTER.with(|count| *count.borrow_mut() = n);
 }
 
+#[ic_cdk_macros::update]
+fn get_and_set(n: Nat) -> Nat {
+    COUNTER.with(|counter| {
+        let old = counter.borrow().clone();
+        *counter.borrow_mut() = n;
+        old
+    })
+}
+
 /// Increment the value of the counter.
 #[ic_cdk_macros::update]
 fn inc() {
@@ -47,4 +56,12 @@ mod tests {
             assert_eq!(get(), Nat::from(i));
         }
     }
+
+    #[test]
+    fn test_get_and_set() {
+        let old = get_and_set(Nat::from(1 as u32));
+        let new = get();
+        assert_eq!(old, Nat::from(0 as u32));
+        assert_eq!(new, Nat::from(1 as u32));
+    }
 }