Migrate from libsnooze (#8)

* Dub

- Removed `libsnooze` dependency

* Queue

- Removed `libsnooze` imports

* Queue

- Added mutex+condition variable

* Queue

- Removed old `ensure()` call

* Queue

- Switched one thing over to mutex+condvar

* Queue

- Switched to using condition variable
- Added configurable slumber interval

.github/workflows/d.yml

@@ -6,9 +6,9 @@ name: D
 
 on:
   push:
-    branches: [ "master" ]
+    branches: [ "**" ]
   pull_request:
-    branches: [ "master", "nextgen" ]
+    branches: [ "**" ]
 
 permissions:
   contents: read
@@ -22,6 +22,11 @@ jobs:
     - uses: actions/checkout@v3
     - uses: dlang-community/setup-dlang@4c99aa991ce7d19dd3064de0a4f2f6b2f152e2d7
 
+    - name: Install Doveralls (code coverage tool)
+      run: |
+        dub fetch doveralls
+        sudo apt install libcurl4-openssl-dev
+
     - name: 'Build & Test'
       run: |
         # Build the project, with its main file included, without unittests
@@ -29,4 +34,8 @@ jobs:
         # Build and run tests, as defined by `unittest` configuration
         # In this mode, `mainSourceFile` is excluded and `version (unittest)` are included
         # See https://dub.pm/package-format-json.html#configurations
-        dub test --compiler=$DC
+        dub test --compiler=$DC --coverage
+
+    - name: Coverage upload
+      run: |
+        dub run doveralls -- -t ${{secrets.COVERALLS_REPO_TOKEN}}

README.md

@@ -3,7 +3,8 @@
 tristanable
 ===========
 
-[![D](https://github.com/deavmi/tristanable/actions/workflows/d.yml/badge.svg)](https://github.com/deavmi/tristanable/actions/workflows/d.yml)
+[![D](https://github.com/deavmi/tristanable/actions/workflows/d.yml/badge.svg)](https://github.com/deavmi/tristanable/actions/workflows/d.yml) ![DUB](https://img.shields.io/dub/v/tristanable?color=%23c10000ff%20&style=flat-square) ![DUB](https://img.shields.io/dub/dt/tristanable?style=flat-square) ![DUB](https://img.shields.io/dub/l/tristanable?style=flat-square) [![Coverage Status](https://coveralls.io/repos/github/deavmi/tristanable/badge.svg?branch=master)](https://coveralls.io/github/deavmi/tristanable?branch=master)
+
 
 **Tristanable** is a library for D-based libraries and applications that need a way to receive variable-length messages of different types (via a `Socket`) and place these messages into their own respectively tagged queues indicated by their _"type"_ or `id`.
 

dub.json

@@ -4,8 +4,7 @@
 	],
 	"copyright": "Copyright © 2023, Tristan B. Kildaire",
 	"dependencies": {
-		"bformat": ">=4.1.1",
-		"libsnooze": ">=1.3.0-beta"
+		"bformat": ">=4.1.1"
 	},
 	"description": "Tristanable network message queuing framework",
 	"homepage": "https://deavmi.assigned.network/projects/tristanable",

source/tristanable/queue.d

@@ -3,14 +3,12 @@
  */
 module tristanable.queue;
 
-// TODO: Examine the below import which seemingly fixes stuff for libsnooze
-import libsnooze.clib;
-import libsnooze;
-
 import core.sync.mutex : Mutex;
+import core.sync.condition : Condition;
+import core.sync.exception : SyncError;
 import std.container.slist : SList;
 import tristanable.encoding;
-import core.thread : dur;
+import core.time : Duration, dur;
 import tristanable.exceptions;
 
 version(unittest)
@@ -27,10 +25,15 @@ version(unittest)
 public class Queue
 {
     /** 
-     * The libsnooze event used to sleep/wake
-     * on queue events
+     * Mutex for the condition variable
      */
-    private Event event;
+    private Mutex mutex;
+
+    /** 
+     * The condition variable used to sleep/wake
+     * on queue of events
+     */
+    private Condition signal;
 
     /** 
      * The queue of messages
@@ -47,6 +50,15 @@ public class Queue
      */
     private ulong queueID;
 
+    /** 
+     * If a message is enqueued prior
+     * to us sleeping then we won't
+     * wake up and return for it.
+     *
+     * Therefore a periodic wakeup
+     * is required.
+     */
+    private Duration wakeInterval;
 
     /** 
      * Constructs a new Queue and immediately sets up the notification
@@ -62,14 +74,37 @@ public class Queue
         /* Initialize the queue lock */
         this.queueLock = new Mutex();
 
-        /* Initialize the event */
-        this.event = new Event();
+        /* Initialize the condition variable */
+        this.mutex = new Mutex();
+        this.signal = new Condition(this.mutex);
 
         /* Set the queue id */
         this.queueID = queueID;
 
-        /* Ensure pipe existence (see https://deavmi.assigned.network/git/deavmi/tristanable/issues/5) */
-        event.wait(dur!("seconds")(0));
+        /* Set the slumber interval */
+        this.wakeInterval = dur!("msecs")(50); // TODO: Decide on value
+    }
+
+    /** 
+     * Returns the current wake interval
+     * for the queue checker
+     *
+     * Returns: the `Duration`
+     */
+    public Duration getWakeInterval()
+    {
+        return this.wakeInterval;
+    }
+
+    /** 
+     * Sets the wake up interval
+     *
+     * Params:
+     *   interval = the new interval
+     */
+    public void setWakeInterval(Duration interval)
+    {
+        this.wakeInterval = interval;
     }
 
     /** 
@@ -111,9 +146,9 @@ public class Queue
         try
         {
             // TODO: Make us wait on the event (optional with a time-out)
-            event.notifyAll();
+            signal.notifyAll();
         }
-        catch(FatalException snozErr)
+        catch(SyncError snozErr)
         {
             // Throw an exception on a fatal exception
             throw new TristanableException(ErrorType.ENQUEUE_FAILED);
@@ -151,45 +186,25 @@ public class Queue
         /* Block till we dequeue a message successfully */
         while(dequeuedMessage is null)
         {
-            /**
-             * Call `wait()` and catch any interrupts
-             * in which case loop back and call `wait()`
-             * again
-             */
-            while(true)
+            scope(exit)
             {
-                try
-                {
-                    // TODO: Make us wait on the event (optional with a time-out)
-                    event.wait();
-                }
-                catch(InterruptedException e)
-                {
-                    version(unittest)
-                    {
-                        import std.stdio;
-                        writeln("dequeue() had libsnooze wait() get interrupted!");
-                    }
-
-                    // Retry the wait()
-                    continue;
-                }
-                catch(FatalException fatalErr)
-                {
-                    version(unittest)
-                    {
-                        import std.stdio;
-                        writeln("dequeue() had libsnooze wait() get FATALLY fail! Exception will now throw...");
-                    }
-
-                    // Throw an exception on a fatal exception
-                    throw new TristanableException(ErrorType.DEQUEUE_FAILED);
-                }
-
-                // On successful wait() wake-up exit this wait()-retry loop
-                break;
+                // Unlock the mutex
+                this.mutex.unlock();
             }
-            
+
+            // Lock the mutex
+            this.mutex.lock();
+
+            try
+            {
+                this.signal.wait(this.wakeInterval);
+            }
+            catch(SyncError e)
+            {
+                // Throw an exception on a fatal exception
+                throw new TristanableException(ErrorType.DEQUEUE_FAILED);
+            }
+
 
             /* Lock the item queue */
             queueLock.lock();