1 files changed, 130 insertions, 0 deletions
diff --git a/src/wqueue2.py b/src/wqueue2.py
new file mode 100755
index 0000000..4c2cd4c
--- /dev/null
+++ b/src/wqueue2.py
@@ -0,0 +1,130 @@
+"""
+Manage a queue of files for processing them sequentialy.
+"""
+
+
+import asyncio
+import os
+import functools
+import shutils
+import collections
+
+
+u8open = functools.partial(open, encoding='utf8')
+
+
+class PersistentQueue3:
+
+    def __init__(self, filename=None):
+        self.queue = collections.deque()
+        self.current_job = collections.deque()
+        self.event = asyncio.Event()
+        self.filename = filename
+
+    def push_job(self, item):
+        self.queue.append(item)
+        self.event.set()
+
+    async def get_job(self, item):
+        if len(self.current_job):
+            return self.current_job[0]
+        if len(self.queue):
+            job_item = self.queue.pop()
+        else:
+            self.event.clear()
+            await self.event.wait()
+            job_item = self.queue.pop()
+        self.current_job.append(job_item))
+        return self.current_job[0]
+
+    async def mark_job_done(self):
+        assert len(self.current_job)
+        self.current_job.pop()
+
+    def dump_queue(self, filename=None):
+        '''
+            dump and clean the queue in order for it to be edited.
+
+            note: current file is not saved since it would be inconsistent if
+            the queue is reloaded but file has finished being processed
+            between.
+
+            Thus a file being processed is considered either done if done
+            between dump and reload, or failed if the queue is shut down
+            before its end.
+
+            The view here is we do not want to redo the work on a file, if the
+            wanted result is a success: do not close the queue.
+        '''
+        filename = filename if filename else self.filename
+        with u8open(filename, 'w') as f:
+            for item in self.queue:
+                print(item, file=f)
+        self.queue.clear()
+
+    def reload_from_filename(self, filename=None):
+        '''
+            reloads a queue after editing it externaly.
+        '''
+        filename = filename if filename else self.filename
+        with u8open(filename) as f:
+            for item in f:
+                self.queue.append(item)
+        self.event.set()
+
+
+async def do_the_job(job=None):
+    assert job
+    print('='*50)
+    print('Current job:', item)
+    do_the_job_here with await
+    print('Current job is done.')
+
+
+async def manage_client(reader, writer):
+    print('='*40)
+    print('manage_client created')
+    print('called on connection only ?')
+    await asyncio.sleep(1)
+    print('after sleep1 in server()')
+    while True:
+        line = await reader.readline()
+        if not line:
+            break
+        print('line', line)
+        writer.write(line)
+    writer.close()
+    print('end of manage_client')
+
+
+async def jobs_runner():
+    jobs = PersistentQueue3(filename='queue.txt')
+    queue = []
+    while True:
+        job = await jobs.get_job()
+        await do_the_job(job=job)
+        jobs.mark_job_done()
+
+
+def main():
+    print('getting event loop')
+    loop = asyncio.get_event_loop()
+    print('got event loop')
+    loop.call_soon(jobs_runner)
+    try:
+        os.unlink('server_sock')
+        print('creating coro...')
+        coro = asyncio.start_unix_server(manage_client, path='server_sock')
+        print('coro created')
+        loop.run_until_complete(coro)
+        print('coro returned')
+        # loop.run_until_complete(test())
+        loop.run_forever()
+    except KeyboardInterrupt:
+        pass
+    print('loop closed')
+    loop.close()
+
+
+if __name__ == '__main__':
+    main()