refactor next_event

Cargo.lock

@@ -670,7 +670,7 @@ dependencies = [
  "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "charset 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "chrono 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-queue 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-channel 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "debug_stub_derive 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "deltachat_derive 2.0.0",
  "email 0.0.21 (git+https://github.com/deltachat/rust-email)",

Cargo.toml

@@ -56,7 +56,6 @@ encoded-words = { git = "https://github.com/async-email/encoded-words", branch="
 native-tls = "0.2.3"
 image = { version = "0.22.4", default-features=false, features = ["gif_codec", "jpeg", "ico", "png_codec", "pnm", "webp", "bmp"] }
 futures = "0.3.4"
-crossbeam-queue = "0.2.1"
 thiserror = "1.0.14"
 anyhow = "1.0.28"
 
@@ -65,6 +64,7 @@ log = {version = "0.4.8", optional = true }
 rustyline = { version = "4.1.0", optional = true }
 ansi_term = { version = "0.12.1", optional = true }
 async-trait = "0.1.31"
+crossbeam-channel = "0.4.2"
 
 [dev-dependencies]
 tempfile = "3.0"

deltachat-ffi/deltachat.h

@@ -190,12 +190,6 @@ typedef struct _dc_event    dc_event_t;
  */
 
 
-
-/**
- * TODO: document
- */  
-int           dc_has_next_event(dc_context_t* context);
-  
 /**
  * TODO: document
  */  

deltachat-ffi/src/lib.rs

@@ -501,18 +501,6 @@ pub unsafe extern "C" fn dc_is_running(context: *mut dc_context_t) -> libc::c_in
     with_inner_async!(ffi_context, ctx, { ctx.is_running() }).unwrap_or_default() as libc::c_int
 }
 
-#[no_mangle]
-pub unsafe extern "C" fn dc_has_next_event(context: *mut dc_context_t) -> libc::c_int {
-    if context.is_null() {
-        return 0;
-    }
-    let ffi_context = &*context;
-
-    ffi_context
-        .with_inner(|ctx| ctx.has_next_event())
-        .unwrap_or_default() as libc::c_int
-}
-
 pub struct EventWrapper {
     pub event_id: libc::c_int,
     pub data1: uintptr_t,

examples/simple.rs

@@ -41,12 +41,8 @@ async fn main() {
     let ctx1 = ctx.clone();
     async_std::task::spawn(async move {
         loop {
-            if ctx1.has_next_event() {
-                if let Ok(event) = ctx1.get_next_event() {
-                    cb(event);
-                }
-            } else {
-                async_std::task::sleep(time::Duration::from_millis(50)).await;
+            if let Ok(event) = ctx1.get_next_event() {
+                cb(event);
             }
         }
     });

src/context.rs

@@ -7,7 +7,7 @@ use std::ops::Deref;
 use anyhow::anyhow;
 use async_std::path::{Path, PathBuf};
 use async_std::sync::{channel, Arc, Mutex, Receiver, RwLock, Sender};
-use crossbeam_queue::SegQueue;
+use crossbeam_channel::{unbounded, Receiver as SyncReceiver, Sender as SyncSender};
 
 use crate::chat::*;
 use crate::config::Config;
@@ -53,7 +53,7 @@ pub struct InnerContext {
     /// Mutex to avoid generating the key for the user more than once.
     pub(crate) generating_key_mutex: Mutex<()>,
     pub(crate) translated_stockstrings: RwLock<HashMap<usize, String>>,
-    pub(crate) logs: SegQueue<Event>,
+    pub(crate) logs: (SyncSender<Event>, SyncReceiver<Event>),
 
     pub(crate) scheduler: RwLock<Scheduler>,
 
@@ -118,7 +118,7 @@ impl Context {
             last_smeared_timestamp: RwLock::new(0),
             generating_key_mutex: Mutex::new(()),
             translated_stockstrings: RwLock::new(HashMap::new()),
-            logs: SegQueue::new(),
+            logs: unbounded(),
             scheduler: RwLock::new(Scheduler::Stopped),
             creation_time: std::time::SystemTime::now(),
         };
@@ -170,22 +170,16 @@ impl Context {
     }
 
     pub fn call_cb(&self, event: Event) {
-        self.logs.push(event);
+        self.logs.0.send(event).expect("failed to send event");
     }
 
     pub fn get_next_event(&self) -> Result<Event> {
-        let event = self.logs.pop().map_err(|err| anyhow!("{}", err))?;
+        let event = self.logs.1.recv().map_err(|err| anyhow!("{}", err))?;
 
         Ok(event)
     }
 
-    pub fn has_next_event(&self) -> bool {
-        !self.logs.is_empty()
-    }
-
-    /*******************************************************************************
-     * Ongoing process allocation/free/check
-     ******************************************************************************/
+    // Ongoing process allocation/free/check
 
     pub async fn alloc_ongoing(&self) -> Result<Receiver<()>> {
         if self.has_ongoing().await {