nanomsg

Pipeline

Code

#include <assert.h>
#include <libc.h>
#include <stdio.h>
#include <nanomsg/nn.h>
#include <nanomsg/pipeline.h>

#define NODE0 "node0"
#define NODE1 "node1"

int node0 (const char *url)
{
  int sock = nn_socket (AF_SP, NN_PULL);
  assert (sock >= 0);
  assert (nn_bind (sock, url) >= 0);
  while (1)
    {
      char *buf = NULL;
      int bytes = nn_recv (sock, &buf, NN_MSG, 0);
      assert (bytes >= 0);
      printf ("NODE0: RECEIVED \"%s\"\n", buf);
      nn_freemsg (buf);
    }
}

int node1 (const char *url, const char *msg)
{
  int sz_msg = strlen (msg) + 1; // '\0' too
  int sock = nn_socket (AF_SP, NN_PUSH);
  assert (sock >= 0);
  assert (nn_connect (sock, url) >= 0);
  printf ("NODE1: SENDING \"%s\"\n", msg);
  int bytes = nn_send (sock, msg, sz_msg, 0);
  assert (bytes == sz_msg);
  return nn_shutdown (sock, 0);
}

int main (const int argc, const char **argv)
{
  if (strncmp (NODE0, argv[1], strlen (NODE0)) == 0 && argc > 1)
    return node0 (argv[2]);
  else if (strncmp (NODE1, argv[1], strlen (NODE1)) == 0 && argc > 2)
    return node1 (argv[2], argv[3]);
  else
    {
      fprintf (stderr, "Usage: pipeline %s|%s <URL> <ARG> ...'\n",
               NODE0, NODE1);
      return 1;
    }
}

Compile

gcc pipeline.c /usr/local/lib/libnanomsg.a -o pipeline

Run

./pipeline node0 ipc:///tmp/pipeline.ipc & node0=$! && sleep 1
./pipeline node1 ipc:///tmp/pipeline.ipc "Hello, World!"
./pipeline node1 ipc:///tmp/pipeline.ipc "Goodbye."
kill $node0

Results

NODE1: SENDING "Hello, World!"
NODE0: RECEIVED "Hello, World!"
NODE1: SENDING "Goodbye."
NODE0: RECEIVED "Goodbye."

Request/Reply

Code

#include <assert.h>
#include <libc.h>
#include <stdio.h>
#include <nanomsg/nn.h>
#include <nanomsg/reqrep.h>

#define NODE0 "node0"
#define NODE1 "node1"
#define DATE "DATE"

char *date ()
{
  time_t raw = time (&raw);
  struct tm *info = localtime (&raw);
  char *text = asctime (info);
  text[strlen(text)-1] = '\0'; // remove '\n'
  return text;
}

int node0 (const char *url)
{
  int sz_date = strlen (DATE) + 1; // '\0' too
  int sock = nn_socket (AF_SP, NN_REP);
  assert (sock >= 0);
  assert (nn_bind (sock, url) >= 0);
  while (1)
    {
      char *buf = NULL;
      int bytes = nn_recv (sock, &buf, NN_MSG, 0);
      assert (bytes >= 0);
      if (strncmp (DATE, buf, sz_date) == 0)
        {
          printf ("NODE0: RECEIVED DATE REQUEST\n");
          char *d = date();
          int sz_d = strlen(d) + 1; // '\0' too
          printf ("NODE0: SENDING DATE %s\n", d);
          bytes = nn_send (sock, d, sz_d, 0);
          assert (bytes == sz_d);
        }
      nn_freemsg (buf);
    }
  return nn_shutdown (sock, 0);
}

int node1 (const char *url)
{
  int sz_date = strlen(DATE) + 1; // '\0' too
  char *buf = NULL;
  int bytes = -1;
  int sock = nn_socket (AF_SP, NN_REQ);
  assert (sock >= 0);
  assert (nn_connect (sock, url) >= 0);
  printf ("NODE1: SENDING DATE REQUEST %s\n", DATE);
  bytes = nn_send (sock, DATE, sz_date, 0);
  assert (bytes == sz_date);
  bytes = nn_recv (sock, &buf, NN_MSG, 0);
  assert (bytes >= 0);
  printf ("NODE1: RECEIVED DATE %s\n", buf, bytes);
  nn_freemsg (buf);
  return nn_shutdown (sock, 0);
}

int main (const int argc, const char **argv)
{
  if (strncmp (NODE0, argv[1], strlen (NODE0)) == 0 && argc > 1)
    return node0 (argv[2]);
  else if (strncmp (NODE1, argv[1], strlen (NODE1)) == 0 && argc > 1)
    return node1 (argv[2]);
  else
    {
      fprintf (stderr, "Usage: reqrep %s|%s <URL> <ARG> ...\n",
               NODE0, NODE1);
      return 1;
    }
}

Compile

gcc reqrep.c /usr/local/lib/libnanomsg.a -o reqrep

Run

./reqrep node0 ipc:///tmp/reqrep.ipc & node0=$! && sleep 1
./reqrep node1 ipc:///tmp/reqrep.ipc
kill $node0

Results

NODE1: SENDING DATE REQUEST DATE
NODE0: RECEIVED DATE REQUEST
NODE0: SENDING DATE Sat Sep  7 17:39:01 2013
NODE1: RECEIVED DATE Sat Sep  7 17:39:01 2013

Pair

Code

#include <assert.h>
#include <libc.h>
#include <nanomsg/nn.h>
#include <nanomsg/pair.h>
#include <stdio.h>

#define NODE0 "node0"
#define NODE1 "node1"

int send_name(int sock, const char *name)
{
  printf ("%s: SENDING \"%s\"\n", name, name);
  int sz_n = strlen (name) + 1; // '\0' too
  return nn_send (sock, name, sz_n, 0);
}

int recv_name(int sock, const char *name)
{
  char *buf = NULL;
  int result = nn_recv (sock, &buf, NN_MSG, 0);
  if (result > 0)
    {
      printf ("%s: RECEIVED \"%s\"\n", name, buf);
      nn_freemsg (buf);
    }
  return result;
}

int send_recv(int sock, const char *name)
{
  int to = 100;
  assert (nn_setsockopt (sock, NN_SOL_SOCKET, NN_RCVTIMEO, &to, sizeof (to)) >= 0);
  while(1)
    {
      recv_name(sock, name);
      sleep(1);
      send_name(sock, name);
    }
}

int node0 (const char *url)
{
  int sock = nn_socket (AF_SP, NN_PAIR);
  assert (sock >= 0);
  assert (nn_bind (sock, url) >= 0);
  send_recv(sock, NODE0);
  return nn_shutdown (sock, 0);
}

int node1 (const char *url)
{
  int sock = nn_socket (AF_SP, NN_PAIR);
  assert (sock >= 0);
  assert (nn_connect (sock, url) >= 0);
  send_recv(sock, NODE1);
  return nn_shutdown (sock, 0);
}

int main (const int argc, const char **argv)
{
  if (strncmp (NODE0, argv[1], strlen (NODE0)) == 0 && argc > 1)
    return node0 (argv[2]);
  else if (strncmp (NODE1, argv[1], strlen (NODE1)) == 0 && argc > 1)
    return node1 (argv[2]);
  else
    {
      fprintf (stderr, "Usage: pair %s|%s <URL> <ARG> ...\n",
               NODE0, NODE1);
      return 1;
    }
}

Compile

gcc pair.c /usr/local/lib/libnanomsg.a -o pair

Run

./pair node0 ipc:///tmp/pair.ipc & node0=$!
./pair node1 ipc:///tmp/pair.ipc & node1=$!
sleep 3
kill $node0 $node1

Results

NODE1: SENDING HELLO
NODE0: RECEIVED HELLO
NODE0: SENDING HELLO
NODE1: RECEIVED HELLO
NODE1: SENDING HELLO
NODE0: RECEIVED HELLO
NODE0: SENDING HELLO
NODE1: RECEIVED HELLO

Pub/Sub

Code

#include <assert.h>
#include <libc.h>
#include <stdio.h>
#include <nanomsg/nn.h>
#include <nanomsg/pubsub.h>

#define SERVER "server"
#define CLIENT "client"

char *date ()
{
  time_t raw = time (&raw);
  struct tm *info = localtime (&raw);
  char *text = asctime (info);
  text[strlen(text)-1] = '\0'; // remove '\n'
  return text;
}

int server (const char *url)
{
  int sock = nn_socket (AF_SP, NN_PUB);
  assert (sock >= 0);
  assert (nn_bind (sock, url) >= 0);
  while (1)
    {
      char *d = date();
      int sz_d = strlen(d) + 1; // '\0' too
      printf ("SERVER: PUBLISHING DATE %s\n", d);
      int bytes = nn_send (sock, d, sz_d, 0);
      assert (bytes == sz_d);
      sleep(1);
    }
  return nn_shutdown (sock, 0);
}

int client (const char *url, const char *name)
{
  int sock = nn_socket (AF_SP, NN_SUB);
  assert (sock >= 0);
  // TODO learn more about publishing/subscribe keys
  assert (nn_setsockopt (sock, NN_SUB, NN_SUB_SUBSCRIBE, "", 0) >= 0);
  assert (nn_connect (sock, url) >= 0);
  while (1)
    {
      char *buf = NULL;
      int bytes = nn_recv (sock, &buf, NN_MSG, 0);
      assert (bytes >= 0);
      printf ("CLIENT (%s): RECEIVED %s\n", name, buf);
      nn_freemsg (buf);
    }
  return nn_shutdown (sock, 0);
}

int main (const int argc, const char **argv)
{
  if (strncmp (SERVER, argv[1], strlen (SERVER)) == 0 && argc >= 2)
    return server (argv[2]);
  else if (strncmp (CLIENT, argv[1], strlen (CLIENT)) == 0 && argc >= 3)
    return client (argv[2], argv[3]);
  else
    {
      fprintf (stderr, "Usage: pubsub %s|%s <URL> <ARG> ...\n",
               SERVER, CLIENT);
      return 1;
    }
}

Compile

gcc pubsub.c /usr/local/lib/libnanomsg.a -o pubsub

Run

./pubsub server ipc:///tmp/pubsub.ipc & server=$! && sleep 1
./pubsub client ipc:///tmp/pubsub.ipc client0 & client0=$!
./pubsub client ipc:///tmp/pubsub.ipc client1 & client1=$!
./pubsub client ipc:///tmp/pubsub.ipc client2 & client2=$!
sleep 5
kill $server $client0 $client1 $client2

Results

SERVER: PUBLISHING DATE Sat Sep  7 17:40:11 2013
SERVER: PUBLISHING DATE Sat Sep  7 17:40:12 2013
SERVER: PUBLISHING DATE Sat Sep  7 17:40:13 2013
CLIENT (client2): RECEIVED Sat Sep  7 17:40:13 2013
CLIENT (client0): RECEIVED Sat Sep  7 17:40:13 2013
CLIENT (client1): RECEIVED Sat Sep  7 17:40:13 2013
SERVER: PUBLISHING DATE Sat Sep  7 17:40:14 2013
CLIENT (client2): RECEIVED Sat Sep  7 17:40:14 2013
CLIENT (client1): RECEIVED Sat Sep  7 17:40:14 2013
CLIENT (client0): RECEIVED Sat Sep  7 17:40:14 2013
SERVER: PUBLISHING DATE Sat Sep  7 17:40:15 2013
CLIENT (client1): RECEIVED Sat Sep  7 17:40:15 2013
CLIENT (client2): RECEIVED Sat Sep  7 17:40:15 2013
CLIENT (client0): RECEIVED Sat Sep  7 17:40:15 2013
SERVER: PUBLISHING DATE Sat Sep  7 17:40:16 2013
CLIENT (client1): RECEIVED Sat Sep  7 17:40:16 2013
CLIENT (client2): RECEIVED Sat Sep  7 17:40:16 2013
CLIENT (client0): RECEIVED Sat Sep  7 17:40:16 2013

Survey

Code

#include <assert.h>
#include <libc.h>
#include <stdio.h>
#include <nanomsg/nn.h>
#include <nanomsg/survey.h>

#define SERVER "server"
#define CLIENT "client"
#define DATE   "DATE"

char *date ()
{
  time_t raw = time (&raw);
  struct tm *info = localtime (&raw);
  char *text = asctime (info);
  text[strlen(text)-1] = '\0'; // remove '\n'
  return text;
}

int server (const char *url)
{
  int sock = nn_socket (AF_SP, NN_SURVEYOR);
  assert (sock >= 0);
  assert (nn_bind (sock, url) >= 0);
  sleep(1); // wait for connections
  int sz_d = strlen(DATE) + 1; // '\0' too
  printf ("SERVER: SENDING DATE SURVEY REQUEST\n");
  int bytes = nn_send (sock, DATE, sz_d, 0);
  assert (bytes == sz_d);
  while (1)
    {
      char *buf = NULL;
      int bytes = nn_recv (sock, &buf, NN_MSG, 0);
      if (bytes == ETIMEDOUT) break;
      if (bytes >= 0)
      {
        printf ("SERVER: RECEIVED \"%s\" SURVEY RESPONSE\n", buf);
        nn_freemsg (buf);
      }
    }
  return nn_shutdown (sock, 0);
}

int client (const char *url, const char *name)
{
  int sock = nn_socket (AF_SP, NN_RESPONDENT);
  assert (sock >= 0);
  assert (nn_connect (sock, url) >= 0);
  while (1)
    {
      char *buf = NULL;
      int bytes = nn_recv (sock, &buf, NN_MSG, 0);
      if (bytes >= 0)
        {
          printf ("CLIENT (%s): RECEIVED \"%s\" SURVEY REQUEST\n", name, buf);
          nn_freemsg (buf);
          char *d = date();
          int sz_d = strlen(d) + 1; // '\0' too
          printf ("CLIENT (%s): SENDING DATE SURVEY RESPONSE\n", name);
          int bytes = nn_send (sock, d, sz_d, 0);
          assert (bytes == sz_d);
        }
    }
  return nn_shutdown (sock, 0);
}

int main (const int argc, const char **argv)
{
  if (strncmp (SERVER, argv[1], strlen (SERVER)) == 0 && argc >= 2)
    return server (argv[2]);
  else if (strncmp (CLIENT, argv[1], strlen (CLIENT)) == 0 && argc >= 3)
    return client (argv[2], argv[3]);
  else
    {
      fprintf (stderr, "Usage: survey %s|%s <URL> <ARG> ...\n",
               SERVER, CLIENT);
      return 1;
    }
}

Compile

gcc survey.c /usr/local/lib/libnanomsg.a -o survey

Run

./survey server ipc:///tmp/survey.ipc & server=$!
./survey client ipc:///tmp/survey.ipc client0 & client0=$!
./survey client ipc:///tmp/survey.ipc client1 & client1=$!
./survey client ipc:///tmp/survey.ipc client2 & client2=$!
sleep 3
kill $server $client0 $client1 $client2

Results

SERVER: SENDING DATE SURVEY REQUEST
CLIENT (client1): RECEIVED "DATE" SURVEY REQUEST
CLIENT (client2): RECEIVED "DATE" SURVEY REQUEST
CLIENT (client0): RECEIVED "DATE" SURVEY REQUEST
CLIENT (client0): SENDING DATE SURVEY RESPONSE
CLIENT (client1): SENDING DATE SURVEY RESPONSE
CLIENT (client2): SENDING DATE SURVEY RESPONSE
SERVER: RECEIVED "Sun Sep 15 13:39:46 2013" SURVEY RESPONSE
SERVER: RECEIVED "Sun Sep 15 13:39:46 2013" SURVEY RESPONSE
SERVER: RECEIVED "Sun Sep 15 13:39:46 2013" SURVEY RESPONSE

Bus

Code

#include <assert.h>
#include <libc.h>
#include <stdio.h>
#include <nanomsg/nn.h>
#include <nanomsg/bus.h>

int node (const int argc, const char **argv)
{
  int sock = nn_socket (AF_SP, NN_BUS);
  assert (sock >= 0);
  assert (nn_bind (sock, argv[2]) >= 0);
  sleep (1); // wait for connections
  if (argc >= 3)
    {
      int x=3;
      for(x; x<argc; x++)
        assert (nn_connect (sock, argv[x]) >= 0);
    }
  sleep (1); // wait for connections
  int to = 100;
  assert (nn_setsockopt (sock, NN_SOL_SOCKET, NN_RCVTIMEO, &to, sizeof (to)) >= 0);
  // SEND
  int sz_n = strlen(argv[1]) + 1; // '\0' too
  printf ("%s: SENDING '%s' ONTO BUS\n", argv[1], argv[1]);
  int send = nn_send (sock, argv[1], sz_n, 0);
  assert (send == sz_n);
  while (1)
    {
      // RECV
      char *buf = NULL;
      int recv = nn_recv (sock, &buf, NN_MSG, 0);
      if (recv >= 0)
        {
          printf ("%s: RECEIVED '%s' FROM BUS\n", argv[1], buf);
          nn_freemsg (buf);
        }
    }
  return nn_shutdown (sock, 0);
}

int main (const int argc, const char **argv)
{
  if (argc >= 3) node (argc, argv);
  else
    {
      fprintf (stderr, "Usage: bus <NODE_NAME> <URL> <URL> ...\n");
      return 1;
    }
}

Compile

gcc bus.c /usr/local/lib/libnanomsg.a -o bus

Run

gcc bus.c /usr/local/lib/libnanomsg.a -o bus
./bus node0 ipc:///tmp/node0.ipc ipc:///tmp/node1.ipc ipc:///tmp/node2.ipc & node0=$!
./bus node1 ipc:///tmp/node1.ipc ipc:///tmp/node2.ipc ipc:///tmp/node3.ipc & node1=$!
./bus node2 ipc:///tmp/node2.ipc ipc:///tmp/node3.ipc & node2=$!
./bus node3 ipc:///tmp/node3.ipc ipc:///tmp/node0.ipc & node3=$!
sleep 5
kill $node0 $node1 $node2 $node3

Results

node0: SENDING 'node0' ONTO BUS
node1: SENDING 'node1' ONTO BUS
node2: SENDING 'node2' ONTO BUS
node3: SENDING 'node3' ONTO BUS
node0: RECEIVED 'node1' FROM BUS
node0: RECEIVED 'node2' FROM BUS
node0: RECEIVED 'node3' FROM BUS
node1: RECEIVED 'node0' FROM BUS
node1: RECEIVED 'node2' FROM BUS
node1: RECEIVED 'node3' FROM BUS
node2: RECEIVED 'node0' FROM BUS
node2: RECEIVED 'node1' FROM BUS
node2: RECEIVED 'node3' FROM BUS
node3: RECEIVED 'node0' FROM BUS
node3: RECEIVED 'node1' FROM BUS
node3: RECEIVED 'node2' FROM BUS

Name		Name	Last commit message	Last commit date
Latest commit History 3 Commits
.gitignore		.gitignore
Makefile		Makefile
README.org		README.org
bus.c		bus.c
bus.sh		bus.sh
pair.c		pair.c
pair.sh		pair.sh
pipeline.c		pipeline.c
pipeline.sh		pipeline.sh
pubsub.c		pubsub.c
pubsub.sh		pubsub.sh
reqrep.c		reqrep.c
reqrep.sh		reqrep.sh
survey.c		survey.c
survey.sh		survey.sh

subjam/nanomsg-examples

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nanomsg

Pipeline

Code

Compile

Run

Results

Request/Reply

Code

Compile

Run

Results

Pair

Code

Compile

Run

Results

Pub/Sub

Code

Compile

Run

Results

Survey

Code

Compile

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Results

Bus

Code

Compile

Run

Results

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