found the type needed to pass closures with local variables

models/testme/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "testme"
+version = "0.1.0"

models/testme/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "testme"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

models/testme/src/main.rs

@@ -0,0 +1,4 @@
+fn main() {
+   let bytes = include_bytes!("./test.txt");
+   println!("{}", String::from_utf8_lossy(bytes));
+}

models/testme/src/test.txt

@@ -0,0 +1 @@
+../../ggml-tiny.en.bin

src/main.rs

@@ -34,11 +34,21 @@ struct Flags {
 fn main() {
    let flags = Flags::parse();
 
-   let handler = Handler{
-      head: flags.stream_head,
-      tail: flags.stream_tail,
-   };
-   let w = new_whisper(flags.model, flags.threads, handler).unwrap();
+   let w = new_whisper_service(
+      flags.model,
+      flags.threads,
+      flags.stream_head,
+      flags.stream_tail,
+      |result: Result<Whispered, String>| {
+         match result {
+            Ok(whispered) => {
+               eprintln!("{}: {:?}", chrono::Local::now(), whispered);
+               println!("{}", whispered.to_string());
+            },
+            Err(msg) => { eprintln!("Error whispering: {}", msg); },
+         };
+      },
+   ).unwrap();
    let stream_retain = (flags.stream_retain * 16_000.0) as usize;
    let stream_step = Duration::new(flags.stream_step, 0);
    match flags.wav {
@@ -63,10 +73,7 @@ fn main() {
          new_listener().listen(move |data: Vec<f32>| {
             data.iter().for_each(|x| buffer.push(*x));
             if Instant::now() - last > stream_step {
-               match w.transcribe_async(&buffer) {
-                  Ok(_) => (),
-                  Err(msg) => eprintln!("{}", msg),
-               };
+               w.transcribe_async(&buffer).unwrap();
 
                match &flags.debug {
                   true => {
@@ -93,28 +100,23 @@ fn main() {
    };
 }
 
-struct Whisper {
+struct WhisperService {
    jobs: std::sync::mpsc::SyncSender<AWhisper>,
 }
 
-struct WhisperEngine {
-   ctx: WhisperContext,
-   threads: i32,
-   handler: Handler,
-}
-
-fn new_whisper(model_path: String, threads: i32, handler: Handler) -> Result<Whisper, String> {
-   match new_whisper_engine(model_path, threads, handler) {
+fn new_whisper_service<F>(model_path: String, threads: i32, stream_head: f32, stream_tail: f32, handler_fn: F) -> Result<WhisperService, String> where F: FnMut(Result<Whispered, String>) + Send + 'static {
+   match new_whisper_engine(model_path, threads) {
       Ok(engine) => {
+         let mut whisper = new_whisper_impl(engine, stream_head, stream_tail, handler_fn);
          let (send, recv) = std::sync::mpsc::sync_channel(100);
-         thread::spawn(move || { engine.transcribe_asyncs(recv); });
-         Ok(Whisper{jobs: send})
+         thread::spawn(move || { whisper.transcribe_asyncs(recv); });
+         Ok(WhisperService{jobs: send})
       },
       Err(msg) => Err(format!("failed to initialize engine: {}", msg)),
    }
 }
 
-impl Whisper {
+impl WhisperService {
    fn transcribe(&self, data: &Vec<f32>) {
       let (send, recv) = std::sync::mpsc::sync_channel(0);
       self._transcribe_async(data, Some(send)).unwrap();
@@ -136,40 +138,78 @@ impl Whisper {
    }
 }
 
-fn new_whisper_engine(model_path: String, threads: i32, handler: Handler) -> Result<WhisperEngine, String> {
-   match WhisperContext::new(&model_path) {
-      Ok(ctx) => Ok(WhisperEngine{ctx: ctx, threads: threads, handler: handler}),
-      Err(msg) => Err(format!("failed to load {}: {}", model_path, msg)),
+struct WhisperImpl {
+   engine: WhisperEngine,
+   stream_head: f32,
+   stream_tail: f32,
+   handler_fn: Option<Box<dyn FnMut(Result<Whispered, String>) + Send + 'static>>
+}
+
+fn new_whisper_impl<F>(engine: WhisperEngine, stream_head: f32, stream_tail: f32, handler_fn: F) -> WhisperImpl where F: FnMut(Result<Whispered, String>) + Send + 'static {
+   WhisperImpl {
+      engine: engine,
+      stream_head: stream_head,
+      stream_tail: stream_tail,
+      handler_fn: Some(Box::new(handler_fn)),
    }
 }
 
-impl WhisperEngine {
-   fn transcribe_asyncs(&self, recv: std::sync::mpsc::Receiver<AWhisper>) {
+impl WhisperImpl {
+   fn transcribe_asyncs(&mut self, recv: std::sync::mpsc::Receiver<AWhisper>) {
       loop {
          match recv.recv() {
             Ok(job) => {
-               match self.transcribe(&job.data) {
-                  Ok(result) => {
-                     self.handler.on_success(result);
-                     match job.ack {
-                        Some(ack) => { let _ = ack.send(true); },
-                        None => (),
-                     };
-                  },
-                  Err(msg) => {
-                     self.handler.on_error(format!("failed to transcribe: {}", msg));
-                     match job.ack {
-                        Some(ack) => { let _ = ack.send(false); },
-                        None => (),
-                     };
+               let result = self.transcribe(&job).is_ok();
+               match job.ack {
+                  Some(ack) => {
+                     ack.send(result).unwrap();
                   },
+                  None => (),
                };
-            },
+            }
             Err(_) => return,
          };
       }
    }
 
+   fn transcribe(&mut self, a_whisper: &AWhisper) -> Result<(), ()> {
+      match self.engine.transcribe(&a_whisper.data) {
+         Ok(result) => {
+            self.on_success(&result);
+            Ok(())
+         },
+         Err(msg) => {
+            self.on_error(msg.to_string());
+            Err(())
+         },
+      }
+   }
+
+   fn on_success(&mut self, whispered: &Whispered) {
+      let result = whispered
+         .after(&(self.stream_head * 100.0))
+         .before(&(self.stream_tail * 100.0));
+      (self.handler_fn.as_mut().unwrap())(Ok(result));
+   }
+
+   fn on_error(&mut self, msg: String) {
+      (self.handler_fn.as_mut().unwrap())(Err(format!("failed to transcribe: {}", &msg)));
+   }
+}
+
+struct WhisperEngine {
+   ctx: WhisperContext,
+   threads: i32,
+}
+
+fn new_whisper_engine(model_path: String, threads: i32) -> Result<WhisperEngine, String> {
+   match WhisperContext::new(&model_path) {
+      Ok(ctx) => Ok(WhisperEngine{ctx: ctx, threads: threads}),
+      Err(msg) => Err(format!("failed to load {}: {}", model_path, msg)),
+   }
+}
+
+impl WhisperEngine {
    fn transcribe(&self, data: &Vec<f32>) -> Result<Whispered, WhisperError> {
       let mut params = FullParams::new(SamplingStrategy::Greedy { best_of: 0 });
       params.set_no_context(true);
@@ -270,25 +310,6 @@ impl Whispered {
    }
 }
 
-struct Handler {
-   head: f32,
-   tail: f32,
-}
-
-impl Handler {
-   fn on_success(&self, result: Whispered) {
-      eprintln!("{}: {:?}", chrono::Local::now(), &result);
-      println!("{}", result
-         .after(&(self.head * 100.0))
-         .before(&(self.tail * 100.0))
-         .to_string(),
-      );
-   }
-   fn on_error(&self, msg: String) {
-      eprintln!("error: {}", msg);
-   }
-}
-
 struct Listener {
 }