chore: add inter-canister call use case to canister logging examples (#906)

Author: maksymar

.github/workflows/motoko-canister-logs-example.yml

@@ -19,7 +19,7 @@ jobs:
     steps:
       - uses: actions/checkout@v1
       - name: Provision Darwin
-        run: bash .github/workflows/provision-darwin.sh
+        run: DFX_VERSION="0.21.0-beta.0" bash .github/workflows/provision-darwin.sh
       - name: Motoko Canister Logs Darwin
         run: |
           dfx start --background
@@ -31,7 +31,7 @@ jobs:
     steps:
       - uses: actions/checkout@v1
       - name: Provision Linux
-        run: bash .github/workflows/provision-linux.sh
+        run: DFX_VERSION="0.21.0-beta.0" bash .github/workflows/provision-linux.sh
       - name: Motoko Canister Logs Linux
         run: |
           dfx start --background

.github/workflows/rust-canister-logs-example.yml

@@ -19,7 +19,7 @@ jobs:
     steps:
       - uses: actions/checkout@v1
       - name: Provision Darwin
-        run: bash .github/workflows/provision-darwin.sh
+        run: DFX_VERSION="0.21.0-beta.0" bash .github/workflows/provision-darwin.sh
       - name: Rust Canister Logs Darwin
         run: |
           dfx start --background
@@ -31,7 +31,7 @@ jobs:
     steps:
       - uses: actions/checkout@v1
       - name: Provision Linux
-        run: bash .github/workflows/provision-linux.sh
+        run: DFX_VERSION="0.21.0-beta.0" bash .github/workflows/provision-linux.sh
       - name: Rust Canister Logs Linux
         run: |
           dfx start --background

motoko/canister_logs/Makefile

@@ -66,6 +66,11 @@ test: install
 	dfx canister logs CanisterLogs \
 		| grep 'timer trap' && echo 'PASS'
 
+	# Test raw_rand.
+	dfx canister call CanisterLogs raw_rand
+	dfx canister logs CanisterLogs \
+		| grep 'ic.raw_rand() call succeeded' && echo 'PASS'
+
 .PHONY: clean
 .SILENT: clean
 clean:

motoko/canister_logs/src/Main.mo

@@ -8,6 +8,7 @@ actor CanisterLogs {
 
   let timerDelaySeconds = 5;
   let second = 1_000_000_000;
+  let ic00_raw_rand = (actor "aaaaa-aa" : actor { raw_rand : () -> async Blob }).raw_rand;
 
   private func execute_timer() : async () {
     Debug.print("right before timer trap");
@@ -45,4 +46,11 @@ actor CanisterLogs {
     let _blob = StableMemory.loadBlob(offset, value);  // Expect reading outside of memory bounds to trap.
   };
 
+  public func raw_rand() : async Blob {
+    Debug.print("pre ic.raw_rand() call");
+    let bytes = await ic00_raw_rand();
+    Debug.print("ic.raw_rand() call succeeded");
+    bytes;
+  };
+
 };

rust/canister_logs/Makefile

@@ -78,6 +78,11 @@ test: install
 	dfx canister logs canister_logs \
 		| grep 'timer trap' && echo 'PASS'
 
+	# Test raw_rand.
+	dfx canister call canister_logs raw_rand
+	dfx canister logs canister_logs \
+		| grep 'ic.raw_rand() call succeeded' && echo 'PASS'
+
 .PHONY: clean
 .SILENT: clean
 clean:

rust/canister_logs/canister_logs.did

@@ -6,4 +6,5 @@ service : {
     "panic" : (text) -> ();
     "memory_oob" : () -> ();
     "failed_unwrap" : () -> ();
+    "raw_rand" : () -> (blob);
 };

rust/canister_logs/src/lib.rs

@@ -1,4 +1,6 @@
-use ic_cdk::{init, post_upgrade, query, update};
+use ic_cdk::{
+    api::management_canister::main::raw_rand as ic00_raw_rand, init, post_upgrade, query, update,
+};
 use std::time::Duration;
 
 const TIMER_INTERVAL_SEC: u64 = 5;
@@ -61,3 +63,18 @@ fn failed_unwrap() {
     ic_cdk::print("right before failed unwrap");
     String::from_utf8(vec![0xc0, 0xff, 0xee]).unwrap(); // Invalid utf8 should panic.
 }
+
+#[update]
+async fn raw_rand() -> Vec<u8> {
+    ic_cdk::println!("pre ic.raw_rand() call");
+    match ic00_raw_rand().await {
+        Ok((bytes,)) => {
+            ic_cdk::println!("ic.raw_rand() call succeeded");
+            bytes
+        }
+        Err(err) => {
+            ic_cdk::println!("ic.raw_rand() call failed: {:?}", err);
+            vec![]
+        }
+    }
+}