Added parallel downloads setting (not in gui options yet), added a thread pool for downloading multiple packages at once- quite helpful for TSR 😁, fixed download resuming (used wrong file mode...)

lib/application_manager/pool.rb

@@ -0,0 +1,89 @@
+class W3DHub
+  class ApplicationManager
+    class Pool
+      def initialize(workers:)
+        @workers = workers.times.collect { Worker.new }
+        @jobs = []
+      end
+
+      def add_job(job)
+        @jobs << job
+      end
+
+      def manage_pool
+        while (@jobs.size.positive? || @workers.any?(&:busy?))
+          feed_pool unless @jobs.size.zero?
+
+          sleep 0.1
+        end
+      end
+
+      def feed_pool
+        @workers.select(&:available?).each do |worker|
+          worker.feed(@jobs.shift)
+        end
+      end
+
+      class Worker
+        def initialize
+          @die = false
+          @job = nil
+
+          Thread.new do
+            until (@die)
+              @job.process if @job && @job.waiting?
+              @job = nil
+              sleep 0.1
+            end
+          end
+        end
+
+        def feed(job)
+          raise "Worker already processing a job!" if @job&.processing?
+
+          @job = job
+        end
+
+        def die!
+          @die = true
+        end
+
+        def available?
+          @job.nil?
+        end
+
+        def busy?
+          !available?
+        end
+      end
+
+      class Job
+        def initialize(block)
+          @block = block
+
+          @state = :waiting
+        end
+
+        def waiting?
+          @state == :waiting
+        end
+
+        def processing?
+          @state == :processing
+        end
+
+        def complete?
+          @state == :complete
+        end
+
+        def process
+          @state = :processing
+
+          @block.call
+
+          @state == :complete
+        end
+      end
+    end
+  end
+end

lib/application_manager/task.rb

@@ -281,23 +281,29 @@ class W3DHub
           @total_bytes_to_download = @packages_to_download.sum { |pkg| pkg.size - pkg.custom_partially_valid_at_bytes }
           @bytes_downloaded = 0
 
+          pool = Pool.new(workers: Store.settings[:parallel_downloads])
+
           @packages_to_download.each do |pkg|
-            package_bytes_downloaded = pkg.custom_partially_valid_at_bytes
+            pool.add_job Pool::Job.new( proc {
+              package_bytes_downloaded = pkg.custom_partially_valid_at_bytes
 
-            package_fetch(pkg) do |chunk, remaining_bytes, total_bytes|
-              @bytes_downloaded += chunk.to_s.length
-              package_bytes_downloaded += chunk.to_s.length
+              package_fetch(pkg) do |chunk, remaining_bytes, total_bytes|
+                @bytes_downloaded += chunk.to_s.length
+                package_bytes_downloaded += chunk.to_s.length
 
-              @status.value = "#{W3DHub.format_size(@bytes_downloaded)} / #{W3DHub.format_size(@total_bytes_to_download)}"
-              @status.progress = @bytes_downloaded.to_f / @total_bytes_to_download
+                @status.value = "#{W3DHub.format_size(@bytes_downloaded)} / #{W3DHub.format_size(@total_bytes_to_download)}"
+                @status.progress = @bytes_downloaded.to_f / @total_bytes_to_download
 
-              operation = @status.operations[:"#{pkg.checksum}"]
-              operation.value = "#{W3DHub.format_size(package_bytes_downloaded)} / #{W3DHub.format_size(pkg.size)}"
-              operation.progress = package_bytes_downloaded.to_f / total_bytes
+                operation = @status.operations[:"#{pkg.checksum}"]
+                operation.value = "#{W3DHub.format_size(package_bytes_downloaded)} / #{W3DHub.format_size(pkg.size)}"
+                operation.progress = package_bytes_downloaded.to_f / pkg.size # total_bytes
 
-              update_interface_task_status
-            end
+                update_interface_task_status
+              end
+            })
           end
+
+          pool.manage_pool
         else
           puts "FAILED!"
           pp package_details
@@ -318,6 +324,7 @@ class W3DHub
         @status.progress = 0.0
 
         packages.each do |pkg|
+          # FIXME: can't add a new key into hash during iteration (RuntimeError)
           @status.operations[:"#{pkg.checksum}"] = Status::Operation.new(
             label: pkg.name,
             value: "Pending...",