From a60f4f9ec4bd339a35469d63c5cec3dc8197f87c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Kav=C3=ADk?= <martin@kavik.cz>
Date: Mon, 8 Jul 2024 14:30:49 +0200
Subject: [PATCH] fix JS testing decoder

---
 Cargo.lock                                    |  11 ++++---
 src-tauri/Cargo.toml                          |   1 +
 src-tauri/src/component_manager.rs            |   2 +-
 src-tauri/src/lib.rs                          |  30 ++++++++++++------
 .../javascript_decoder.wasm                   | Bin 10108533 -> 10108530 bytes
 .../javascript_decoder/src/index.js           |   2 +-
 6 files changed, 31 insertions(+), 15 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index e499807..04016b6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1691,6 +1691,7 @@ checksum = "9fc0510504f03c51ada170672ac806f1f105a88aa97a5281117e1ddc3368e51a"
 name = "fastwave"
 version = "0.1.0"
 dependencies = [
+ "futures",
  "once_cell",
  "serde",
  "serde_json",
@@ -1840,12 +1841,13 @@ dependencies = [
 
 [[package]]
 name = "futures"
-version = "0.3.28"
+version = "0.3.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "23342abe12aba583913b2e62f22225ff9c950774065e4bfb61a19cd9770fec40"
+checksum = "645c6916888f6cb6350d2550b80fb63e734897a8498abe35cfb732b6487804b0"
 dependencies = [
  "futures-channel",
  "futures-core",
+ "futures-executor",
  "futures-io",
  "futures-sink",
  "futures-task",
@@ -1870,9 +1872,9 @@ checksum = "dfc6580bb841c5a68e9ef15c77ccc837b40a7504914d52e47b8b0e9bbda25a1d"
 
 [[package]]
 name = "futures-executor"
-version = "0.3.28"
+version = "0.3.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ccecee823288125bd88b4d7f565c9e58e41858e47ab72e8ea2d64e93624386e0"
+checksum = "a576fc72ae164fca6b9db127eaa9a9dda0d61316034f33a0a0d4eda41f02b01d"
 dependencies = [
  "futures-core",
  "futures-task",
@@ -1943,6 +1945,7 @@ version = "0.3.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3d6401deb83407ab3da39eba7e33987a73c3df0c82b4bb5813ee871c19c41d48"
 dependencies = [
+ "futures-channel",
  "futures-core",
  "futures-io",
  "futures-macro",
diff --git a/src-tauri/Cargo.toml b/src-tauri/Cargo.toml
index f0b386c..8884690 100644
--- a/src-tauri/Cargo.toml
+++ b/src-tauri/Cargo.toml
@@ -24,6 +24,7 @@ tauri = { version = "=2.0.0-beta.22", features = ["macos-private-api", "linux-ip
 tauri-plugin-window-state = "=2.0.0-beta.9"
 tauri-plugin-dialog = "=2.0.0-beta.9"
 once_cell = "1.19.0"
+futures = "0.3.30"
 
 # wasmtime = "22.0.0"
 # wasmtime-wasi = "22.0.0"
diff --git a/src-tauri/src/component_manager.rs b/src-tauri/src/component_manager.rs
index 8d92458..69faa11 100644
--- a/src-tauri/src/component_manager.rs
+++ b/src-tauri/src/component_manager.rs
@@ -79,7 +79,7 @@ pub async fn remove_all_decoders() -> RemovedDecodersCount {
 // All Release
 // FW.add_decoders(["../../test_files/components/rust_decoder/rust_decoder.wasm", "../../test_files/components/javascript_decoder/javascript_decoder.wasm", "../../test_files/components/python_decoder/python_decoder.wasm"])
 pub async fn add_decoders(decoder_paths: Vec<DecoderPath>) -> AddedDecodersCount {
-    println!("decoders in Tauri: {decoder_paths:#?}");
+    println!("Decoders: {decoder_paths:#?}");
     println!("Current dir: {:#?}", std::env::current_dir().unwrap());
 
     let mut added_decoders_count = 0;
diff --git a/src-tauri/src/lib.rs b/src-tauri/src/lib.rs
index 9a2cb18..0d2df5b 100644
--- a/src-tauri/src/lib.rs
+++ b/src-tauri/src/lib.rs
@@ -87,15 +87,27 @@ async fn load_signal_and_get_timeline(
         var_format,
         |mut value: String| {
             Box::pin(async {
-                let decoders = component_manager::DECODERS.read().await;
-                let mut store_lock = component_manager::STORE.lock().await;
-                let mut store = store_lock.as_context_mut();
-                for decoder in decoders.iter() {
-                    value = decoder
-                        .component_decoder_decoder()
-                        .call_format_signal_value(&mut store, &value)
-                        .unwrap()
-                }
+                // We need to spawn a (non-runtime-specific?) blocking task before calling component methods to prevent this error:
+                // "Cannot start a runtime from within a runtime. This happens because a function (like `block_on`) attempted to block the current thread while the thread is being used to drive asynchronous tasks."
+                // @TODO Workaround? Is it a problem only for non-Rust components? Is it needed only when there is a problem in the component (e.g. "`Err` value: wasm trap: cannot enter component instance"?)
+                // let value = std::thread::spawn(move || {
+                    // futures::executor::block_on(async move {
+                        let decoders = component_manager::DECODERS.read().await;
+                        let mut store_lock = component_manager::STORE.lock().await;
+                        let mut store = store_lock.as_context_mut();
+
+                        for decoder in decoders.iter() {
+                            value = decoder
+                                .component_decoder_decoder()
+                                .call_format_signal_value(&mut store, &value)
+                                // @TODO Resolve panic when running non-Rust components:
+                                // `Err` value: wasm trap: cannot enter component instance
+                                // https://github.com/bytecodealliance/wasmtime/issues/8670 ?
+                                .unwrap()
+                        }
+                        // value
+                    // })
+                // }).join().unwrap();
                 value
             })
         },
diff --git a/test_files/components/javascript_decoder/javascript_decoder.wasm b/test_files/components/javascript_decoder/javascript_decoder.wasm
index 56fc06f3f4eca49d228450247e110baffb392e94..de925088b067b3980182f4cc7dc723daa6f8912c 100644
GIT binary patch
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diff --git a/test_files/components/javascript_decoder/src/index.js b/test_files/components/javascript_decoder/src/index.js
index 4b33938..add3212 100644
--- a/test_files/components/javascript_decoder/src/index.js
+++ b/test_files/components/javascript_decoder/src/index.js
@@ -10,7 +10,7 @@ export const decoder = {
         return name
     },
     formatSignalValue(value) {
-        value + "!"
+        return value + "!"
     }
 }