[zeromq-dev] Malamute broker project
Kenneth Adam Miller
kennethadammiller at gmail.com
Mon Mar 2 22:25:46 CET 2015
Yeah that fixed it!
Now I just have to iron out what precisely is concurrent.
On Mon, Mar 2, 2015 at 4:24 PM, Kenneth Adam Miller <
kennethadammiller at gmail.com> wrote:
> Wait, is it because each of the peers have specified the same mailbox?
>
> On Mon, Mar 2, 2015 at 4:12 PM, Kenneth Adam Miller <
> kennethadammiller at gmail.com> wrote:
>
>> But only one side gets a message from the broker. The other side just
>> freezes.
>>
>> On Mon, Mar 2, 2015 at 3:54 PM, Pieter Hintjens <ph at imatix.com> wrote:
>>
>>> Sure, it'd work as subjects.
>>>
>>> On Mon, Mar 2, 2015 at 8:07 PM, Kenneth Adam Miller
>>> <kennethadammiller at gmail.com> wrote:
>>> > What are the two messages SET and GET that you're talking about? Are
>>> you
>>> > saying that sendfor parameter char * address is "ADDRESS" and subject
>>> is
>>> > "GET" or "SET" depending on whether or not there should be a read,
>>> with the
>>> > contents being the actual "tcp://some_IP:some_port"? Or actually
>>> author the
>>> > protocol for brokering where I use actual broker commands SET and GET?
>>> >
>>> > Is send_for exchangeable for send_forx in this context?
>>> >
>>> > I changed it to this, trying to follow mlm_client.c:
>>> >
>>> > char * exchange_addresses(std::string consumer_topic, std::string
>>> > production_topic, std::string toSend) {
>>> > mlm_client_t *client_reader = mlm_client_new();
>>> > assert(client_reader);
>>> > mlm_client_t *client_writer = mlm_client_new();
>>> > assert(client_writer);
>>> >
>>> > int rc=mlm_client_connect (client_reader, "tcp://127.0.0.1:9999"
>>> , 3000,
>>> > "ADDRESS");
>>> > assert(rc==0);
>>> > rc=mlm_client_connect (client_writer, "tcp://127.0.0.1:9999" ,
>>> 3000,
>>> > "");
>>> > assert(rc==0);
>>> >
>>> > std::cout << "producing to topic: " << production_topic << std::endl;
>>> > std::cout << "consuming from topic: " << consumer_topic << std::endl;
>>> > if (!mlm_client_sendtox(client_writer, "ADDRESS", "SET",
>>> toSend.c_str(),
>>> > NULL)) {
>>> > std::cout << "client sent message" << std::endl;
>>> > }
>>> > else {
>>> > std::cerr << "error sending message" << std::endl;
>>> > }
>>> >
>>> >
>>> > char *subject, *content, *attach;
>>> > std::cerr << consumer_topic << " receiving message" << std::endl;
>>> > mlm_client_recvx (client_reader, &subject, &content, &attach, NULL);
>>> > mlm_client_destroy(&client_writer);
>>> > mlm_client_destroy(&client_reader);
>>> > std::cout << "received: \"" << subject << "\" :" << content << "." <<
>>> > std::endl;
>>> > zstr_free(&subject);
>>> > return content;
>>> > }
>>> >
>>> >
>>> > I get one of the set messages, but
>>> >
>>> > On Mon, Mar 2, 2015 at 12:59 PM, Pieter Hintjens <ph at imatix.com>
>>> wrote:
>>> >>
>>> >> Sure, it's much more fun if you write this up.
>>> >>
>>> >> On Mon, Mar 2, 2015 at 6:56 PM, Kenneth Adam Miller
>>> >> <kennethadammiller at gmail.com> wrote:
>>> >> > I can help you with writing an article :)
>>> >> >
>>> >> > I was literally discovery what you were telling me, since sometimes,
>>> >> > about
>>> >> > 1/4 of the time, it would succeed. What you say rationalizes my
>>> >> > considerations since I was literally writing you an email about
>>> what I
>>> >> > was
>>> >> > witnessing.
>>> >> >
>>> >> > Let me try to work out what you're saying, then I can post what I
>>> >> > established to a public github repo :)
>>> >> >
>>> >> > On Mon, Mar 2, 2015 at 12:50 PM, Pieter Hintjens <ph at imatix.com>
>>> wrote:
>>> >> >>
>>> >> >> The problem with streams is there's no persistence yet, so both
>>> peers
>>> >> >> have to be present at the same time. A name registration/lookup
>>> >> >> service is probably better.
>>> >> >>
>>> >> >> Yes, the set_worker call offers a service. I'd do this:
>>> >> >>
>>> >> >> - offer a service "ADDRESS" using set_worker
>>> >> >> - two messages: SET and GET, each taking a name/value (use frames
>>> or
>>> >> >> any other encoding you like)
>>> >> >> - use the sendfor method to send the request
>>> >> >> - use the sendto method to send the replies, which end in a
>>> client's
>>> >> >> mailbox
>>> >> >> - read the replies using the recv method
>>> >> >>
>>> >> >> For this to work, peers need to specify a mailbox address in the
>>> >> >> connect
>>> >> >> method.
>>> >> >>
>>> >> >> If you like I'll write an article and make examples.
>>> >> >>
>>> >> >> -Pieter
>>> >> >>
>>> >> >> On Mon, Mar 2, 2015 at 6:45 PM, Kenneth Adam Miller
>>> >> >> <kennethadammiller at gmail.com> wrote:
>>> >> >> > I got it to work by setting the subscribed topic to "inproc*" on
>>> >> >> > mlm_client_set_worker call.
>>> >> >> >
>>> >> >> > On Mon, Mar 2, 2015 at 12:07 PM, Kenneth Adam Miller
>>> >> >> > <kennethadammiller at gmail.com> wrote:
>>> >> >> >>
>>> >> >> >> Ok after looking at mlm_client.c, I have the following:
>>> >> >> >>
>>> >> >> >> Two concurrent calls to exchange addresses with the following
>>> >> >> >> parameters:
>>> >> >> >>
>>> >> >> >> //thread 1
>>> >> >> >> char * servrAddr = exchange_addresses("backendEndpoints",
>>> >> >> >> "frontendEndpoints", "inproc://frontend");
>>> >> >> >> //thread 2
>>> >> >> >> char * servrAddr = exchange_addresses("frontendEndpoints",
>>> >> >> >> "backendEndpoints", "inproc://backend");
>>> >> >> >>
>>> >> >> >> Where exchange addresses is implemented as:
>>> >> >> >>
>>> >> >> >> char * exchange_addresses(std::string consumer_topic,
>>> std::string
>>> >> >> >> production_topic, std::string toSend) {
>>> >> >> >> mlm_client_t *client_reader = mlm_client_new();
>>> >> >> >> assert(client_reader);
>>> >> >> >> mlm_client_t *client_writer = mlm_client_new();
>>> >> >> >> assert(client_writer);
>>> >> >> >>
>>> >> >> >> int rc=mlm_client_connect (client_reader, "tcp://
>>> 127.0.0.1:9999"
>>> >> >> >> ,
>>> >> >> >> 3000, "");
>>> >> >> >> assert(rc==0);
>>> >> >> >> rc=mlm_client_connect (client_writer, "tcp://127.0.0.1:9999"
>>> ,
>>> >> >> >> 3000,
>>> >> >> >> "");
>>> >> >> >> assert(rc==0);
>>> >> >> >>
>>> >> >> >> std::cout << "producing to topic: " << production_topic <<
>>> >> >> >> std::endl;
>>> >> >> >> std::cout << "consuming from topic: " << consumer_topic <<
>>> >> >> >> std::endl;
>>> >> >> >> mlm_client_set_worker(client_reader, consumer_topic.c_str(),
>>> "*");
>>> >> >> >> if (!mlm_client_sendforx (client_writer,
>>> production_topic.c_str(),
>>> >> >> >> toSend.c_str(), "", NULL))
>>> >> >> >> std::cout << "client sent message" << std::endl;
>>> >> >> >> else
>>> >> >> >> std::cerr << "error sending message" << std::endl;
>>> >> >> >>
>>> >> >> >>
>>> >> >> >> char *subject, *content, *attach;
>>> >> >> >> mlm_client_recvx (client_reader, &subject, &content, NULL);
>>> //<--
>>> >> >> >> blocking here
>>> >> >> >> mlm_client_destroy(&client_writer);
>>> >> >> >> mlm_client_destroy(&client_reader);
>>> >> >> >> std::cout << "received: " << subject << " " << content <<
>>> >> >> >> std::endl;
>>> >> >> >> return content;
>>> >> >> >> }
>>> >> >> >>
>>> >> >> >>
>>> >> >> >> Problem is, both threads block at mlm_client_recvx... As per
>>> >> >> >> example,
>>> >> >> >> it
>>> >> >> >> looks correct.
>>> >> >> >>
>>> >> >> >> On Mon, Mar 2, 2015 at 11:30 AM, Kenneth Adam Miller
>>> >> >> >> <kennethadammiller at gmail.com> wrote:
>>> >> >> >>>
>>> >> >> >>> Oh you mean with mlm_client_set_worker! Do I do set_worker on
>>> each
>>> >> >> >>> side
>>> >> >> >>> with different service names? How does a client get a specific
>>> >> >> >>> service?
>>> >> >> >>>
>>> >> >> >>> On Mon, Mar 2, 2015 at 11:26 AM, Kenneth Adam Miller
>>> >> >> >>> <kennethadammiller at gmail.com> wrote:
>>> >> >> >>>>
>>> >> >> >>>> Service semantics? I don't know what those are...
>>> >> >> >>>> I read what tutorials I think that there are. I have some
>>> >> >> >>>> questions
>>> >> >> >>>> about the how things are forwarded-I want only one to one
>>> >> >> >>>> pairing...
>>> >> >> >>>> I'm not
>>> >> >> >>>> sure if what I'm doing is setting up for publishing and
>>> >> >> >>>> subscriptions. There
>>> >> >> >>>> was a lot of talk about some of the other features in the
>>> malamute
>>> >> >> >>>> manual/whitepaper, and it's kind of confusing. Basically, I
>>> just
>>> >> >> >>>> want
>>> >> >> >>>> FCFS
>>> >> >> >>>> exchange of information for mutually requiring parties.
>>> >> >> >>>>
>>> >> >> >>>> On Mon, Mar 2, 2015 at 4:13 AM, Pieter Hintjens <
>>> ph at imatix.com>
>>> >> >> >>>> wrote:
>>> >> >> >>>>>
>>> >> >> >>>>> The simplest way to make a lookup service is using the
>>> service
>>> >> >> >>>>> semantics, and the lookup service can talk to the broker over
>>> >> >> >>>>> inproc
>>> >> >> >>>>> or tcp as it wants (it could be a thread in the same
>>> process, or
>>> >> >> >>>>> a
>>> >> >> >>>>> separate process).
>>> >> >> >>>>>
>>> >> >> >>>>> On Sun, Mar 1, 2015 at 9:00 PM, Kenneth Adam Miller
>>> >> >> >>>>> <kennethadammiller at gmail.com> wrote:
>>> >> >> >>>>> > So, in order to manage a mutual exchange of address
>>> between two
>>> >> >> >>>>> > concurrent
>>> >> >> >>>>> > parties, I thought that on each side I would have a
>>> producer
>>> >> >> >>>>> > produce
>>> >> >> >>>>> > to a
>>> >> >> >>>>> > topic that the opposite side was subscribed to. That means
>>> that
>>> >> >> >>>>> > each
>>> >> >> >>>>> > side is
>>> >> >> >>>>> > both a producer and a consumer.
>>> >> >> >>>>> >
>>> >> >> >>>>> > I have the two entities running in parallel. The front end
>>> >> >> >>>>> > client
>>> >> >> >>>>> > connects
>>> >> >> >>>>> > to the malamute broker, and subscribes to the
>>> backendEndpoints
>>> >> >> >>>>> > topic,
>>> >> >> >>>>> > and
>>> >> >> >>>>> > then producing it's endpoint to the frontendEndpoints
>>> topic.
>>> >> >> >>>>> >
>>> >> >> >>>>> > The opposite side does the same thing, with the back end
>>> >> >> >>>>> > subscribing
>>> >> >> >>>>> > to the
>>> >> >> >>>>> > frontendEndpoints and producing to backendEndpoints.
>>> >> >> >>>>> >
>>> >> >> >>>>> >
>>> >> >> >>>>> > The problem is that if the front end and back end are in
>>> their
>>> >> >> >>>>> > own
>>> >> >> >>>>> > threads
>>> >> >> >>>>> > then only the thread that completes the mlm_set_producer
>>> and
>>> >> >> >>>>> > mlm_set_consumer call proceed. The one that didn't make it
>>> that
>>> >> >> >>>>> > far
>>> >> >> >>>>> > will
>>> >> >> >>>>> > hang at that mlm_set_x pair point...
>>> >> >> >>>>> >
>>> >> >> >>>>> > code:
>>> >> >> >>>>> >
>>> >> >> >>>>> > std::cout << "connectToFrontEnd" << std::endl;
>>> >> >> >>>>> > mlm_client_t *frontend_reader = mlm_client_new();
>>> >> >> >>>>> > assert(frontend_reader);
>>> >> >> >>>>> > mlm_client_t *frontend_writer = mlm_client_new();
>>> >> >> >>>>> > assert(frontend_writer);
>>> >> >> >>>>> > int rc=mlm_client_connect (frontend_reader,
>>> >> >> >>>>> > "tcp://127.0.0.1:9999"
>>> >> >> >>>>> > ,
>>> >> >> >>>>> > 1000, "reader/secret");
>>> >> >> >>>>> > assert(rc==0);
>>> >> >> >>>>> > rc=mlm_client_connect (frontend_writer,
>>> >> >> >>>>> > "tcp://127.0.0.1:9999"
>>> >> >> >>>>> > ,
>>> >> >> >>>>> > 1000,
>>> >> >> >>>>> > "writer/secret");
>>> >> >> >>>>> > assert(rc==0);
>>> >> >> >>>>> > std::cout << "frontend mlm clients connected" <<
>>> std::endl;
>>> >> >> >>>>> >
>>> >> >> >>>>> > mlm_client_set_consumer(frontend_reader,
>>> "backendEndpoints",
>>> >> >> >>>>> > "*");
>>> >> >> >>>>> > mlm_client_set_producer(frontend_writer,
>>> >> >> >>>>> > "frontendEndpoints");
>>> >> >> >>>>> > std::cout << "frontend client producers and consumers
>>> set" <<
>>> >> >> >>>>> > std::endl;
>>> >> >> >>>>> >
>>> >> >> >>>>> >
>>> >> >> >>>>> > The code looks exactly* the same for the backend, but with
>>> some
>>> >> >> >>>>> > variable and
>>> >> >> >>>>> > other changes.
>>> >> >> >>>>> >
>>> >> >> >>>>> > std::cout << "connectToBackEnd" << std::endl;
>>> >> >> >>>>> > mlm_client_t *backend_reader = mlm_client_new();
>>> >> >> >>>>> > assert(backend_reader);
>>> >> >> >>>>> > mlm_client_t *backend_writer = mlm_client_new();
>>> >> >> >>>>> > assert(backend_writer);
>>> >> >> >>>>> > int
>>> >> >> >>>>> > rc=mlm_client_connect(backend_reader,"tcp://127.0.0.1:9999
>>> ",
>>> >> >> >>>>> > 1000,
>>> >> >> >>>>> > "reader/secret");
>>> >> >> >>>>> > assert(rc==0);
>>> >> >> >>>>> > rc=mlm_client_connect(backend_writer,"tcp://
>>> 127.0.0.1:9999",
>>> >> >> >>>>> > 1000,
>>> >> >> >>>>> > "writer/secret");
>>> >> >> >>>>> > assert(rc==0);
>>> >> >> >>>>> > std::cout << "backend mlm clients connected" <<
>>> std::endl;
>>> >> >> >>>>> >
>>> >> >> >>>>> > mlm_client_set_consumer(backend_reader,
>>> "frontendEndpoints",
>>> >> >> >>>>> > "*");
>>> >> >> >>>>> > mlm_client_set_producer(backend_writer,
>>> "backendEndpoints");
>>> >> >> >>>>> > std::cout << "backend client producers and consumers
>>> set" <<
>>> >> >> >>>>> > std::endl;
>>> >> >> >>>>> >
>>> >> >> >>>>> > I only ever will see either "frontend client produces and
>>> >> >> >>>>> > consumers
>>> >> >> >>>>> > set" or
>>> >> >> >>>>> > "backend client producers and consumers set".
>>> >> >> >>>>> >
>>> >> >> >>>>> > On Sun, Mar 1, 2015 at 2:00 PM, Pieter Hintjens <
>>> ph at imatix.com>
>>> >> >> >>>>> > wrote:
>>> >> >> >>>>> >>
>>> >> >> >>>>> >> My assumption is that a broker that's doing a lot of
>>> service
>>> >> >> >>>>> >> requests
>>> >> >> >>>>> >> won't be showing costs of regular expression matching,
>>> >> >> >>>>> >> compared
>>> >> >> >>>>> >> to
>>> >> >> >>>>> >> the
>>> >> >> >>>>> >> workload.
>>> >> >> >>>>> >>
>>> >> >> >>>>> >>
>>> >> >> >>>>> >> On Sun, Mar 1, 2015 at 7:49 PM, Doron Somech
>>> >> >> >>>>> >> <somdoron at gmail.com>
>>> >> >> >>>>> >> wrote:
>>> >> >> >>>>> >> >> I did it in actors and then moved it back into the main
>>> >> >> >>>>> >> >> server
>>> >> >> >>>>> >> >> as
>>> >> >> >>>>> >> >> it
>>> >> >> >>>>> >> >> was complexity for nothing (at that stage). I'd rather
>>> >> >> >>>>> >> >> design
>>> >> >> >>>>> >> >> against
>>> >> >> >>>>> >> >> real use than against theory.
>>> >> >> >>>>> >> >
>>> >> >> >>>>> >> > Don't you worry about the matching performance which
>>> will
>>> >> >> >>>>> >> > happen
>>> >> >> >>>>> >> > on the
>>> >> >> >>>>> >> > main
>>> >> >> >>>>> >> > thread? Also a usage I can see is to use exact matching
>>> >> >> >>>>> >> > (string
>>> >> >> >>>>> >> > comparison)
>>> >> >> >>>>> >> > over regular expression (I usually use exact matching),
>>> this
>>> >> >> >>>>> >> > is
>>> >> >> >>>>> >> > way I
>>> >> >> >>>>> >> > think
>>> >> >> >>>>> >> > the plugin model fits the service as well.
>>> >> >> >>>>> >> >
>>> >> >> >>>>> >> > On Sun, Mar 1, 2015 at 8:09 PM, Pieter Hintjens
>>> >> >> >>>>> >> > <ph at imatix.com>
>>> >> >> >>>>> >> > wrote:
>>> >> >> >>>>> >> >>
>>> >> >> >>>>> >> >> On Sun, Mar 1, 2015 at 5:52 PM, Doron Somech
>>> >> >> >>>>> >> >> <somdoron at gmail.com>
>>> >> >> >>>>> >> >> wrote:
>>> >> >> >>>>> >> >>
>>> >> >> >>>>> >> >> > So I went over the code, really liked it. Very
>>> simple.
>>> >> >> >>>>> >> >>
>>> >> >> >>>>> >> >> Thanks. I like the plugin model, especially neat using
>>> CZMQ
>>> >> >> >>>>> >> >> actors.
>>> >> >> >>>>> >> >>
>>> >> >> >>>>> >> >> > I have a question regarding services, for each
>>> stream you
>>> >> >> >>>>> >> >> > are
>>> >> >> >>>>> >> >> > using a
>>> >> >> >>>>> >> >> > dedicate thread (actors) and one thread for managing
>>> >> >> >>>>> >> >> > mailboxes.
>>> >> >> >>>>> >> >> > However
>>> >> >> >>>>> >> >> > (if
>>> >> >> >>>>> >> >> > I understood correctly) for services you are doing
>>> the
>>> >> >> >>>>> >> >> > processing
>>> >> >> >>>>> >> >> > inside
>>> >> >> >>>>> >> >> > the
>>> >> >> >>>>> >> >> > server thread, why didn't you use an actor for each
>>> >> >> >>>>> >> >> > service
>>> >> >> >>>>> >> >> > or
>>> >> >> >>>>> >> >> > actor
>>> >> >> >>>>> >> >> > to
>>> >> >> >>>>> >> >> > manage all services? I think the matching of
>>> services can
>>> >> >> >>>>> >> >> > be
>>> >> >> >>>>> >> >> > expensive
>>> >> >> >>>>> >> >> > and
>>> >> >> >>>>> >> >> > block the main thread.
>>> >> >> >>>>> >> >>
>>> >> >> >>>>> >> >> I did it in actors and then moved it back into the main
>>> >> >> >>>>> >> >> server
>>> >> >> >>>>> >> >> as
>>> >> >> >>>>> >> >> it
>>> >> >> >>>>> >> >> was complexity for nothing (at that stage). I'd rather
>>> >> >> >>>>> >> >> design
>>> >> >> >>>>> >> >> against
>>> >> >> >>>>> >> >> real use than against theory.
>>> >> >> >>>>> >> >>
>>> >> >> >>>>> >> >> -Pieter
>>> >> >> >>>>> >> >> _______________________________________________
>>> >> >> >>>>> >> >> zeromq-dev mailing list
>>> >> >> >>>>> >> >> zeromq-dev at lists.zeromq.org
>>> >> >> >>>>> >> >> http://lists.zeromq.org/mailman/listinfo/zeromq-dev
>>> >> >> >>>>> >> >
>>> >> >> >>>>> >> >
>>> >> >> >>>>> >> >
>>> >> >> >>>>> >> > _______________________________________________
>>> >> >> >>>>> >> > zeromq-dev mailing list
>>> >> >> >>>>> >> > zeromq-dev at lists.zeromq.org
>>> >> >> >>>>> >> > http://lists.zeromq.org/mailman/listinfo/zeromq-dev
>>> >> >> >>>>> >> >
>>> >> >> >>>>> >> _______________________________________________
>>> >> >> >>>>> >> zeromq-dev mailing list
>>> >> >> >>>>> >> zeromq-dev at lists.zeromq.org
>>> >> >> >>>>> >> http://lists.zeromq.org/mailman/listinfo/zeromq-dev
>>> >> >> >>>>> >
>>> >> >> >>>>> >
>>> >> >> >>>>> >
>>> >> >> >>>>> > _______________________________________________
>>> >> >> >>>>> > zeromq-dev mailing list
>>> >> >> >>>>> > zeromq-dev at lists.zeromq.org
>>> >> >> >>>>> > http://lists.zeromq.org/mailman/listinfo/zeromq-dev
>>> >> >> >>>>> >
>>> >> >> >>>>> _______________________________________________
>>> >> >> >>>>> zeromq-dev mailing list
>>> >> >> >>>>> zeromq-dev at lists.zeromq.org
>>> >> >> >>>>> http://lists.zeromq.org/mailman/listinfo/zeromq-dev
>>> >> >> >>>>
>>> >> >> >>>>
>>> >> >> >>>
>>> >> >> >>
>>> >> >> >
>>> >> >> >
>>> >> >> > _______________________________________________
>>> >> >> > zeromq-dev mailing list
>>> >> >> > zeromq-dev at lists.zeromq.org
>>> >> >> > http://lists.zeromq.org/mailman/listinfo/zeromq-dev
>>> >> >> >
>>> >> >> _______________________________________________
>>> >> >> zeromq-dev mailing list
>>> >> >> zeromq-dev at lists.zeromq.org
>>> >> >> http://lists.zeromq.org/mailman/listinfo/zeromq-dev
>>> >> >
>>> >> >
>>> >> >
>>> >> > _______________________________________________
>>> >> > zeromq-dev mailing list
>>> >> > zeromq-dev at lists.zeromq.org
>>> >> > http://lists.zeromq.org/mailman/listinfo/zeromq-dev
>>> >> >
>>> >> _______________________________________________
>>> >> zeromq-dev mailing list
>>> >> zeromq-dev at lists.zeromq.org
>>> >> http://lists.zeromq.org/mailman/listinfo/zeromq-dev
>>> >
>>> >
>>> >
>>> > _______________________________________________
>>> > zeromq-dev mailing list
>>> > zeromq-dev at lists.zeromq.org
>>> > http://lists.zeromq.org/mailman/listinfo/zeromq-dev
>>> >
>>> _______________________________________________
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>>> http://lists.zeromq.org/mailman/listinfo/zeromq-dev
>>>
>>
>>
>
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