Add an Apache Kafka output module

configure.ac

@@ -229,6 +229,13 @@ AC_ARG_ENABLE(man-pages,
               [  --disable-man-pages     Disable building the man pages (default: on)]
               ,,enable_man_pages="yes")
 
+AC_ARG_ENABLE(kafka,
+              [ --disable-kafka           Disable Kafka support (default: auto)]
+              ,,enable_kafka="auto")
+
+AC_ARG_WITH(librdkafka,
+             AC_HELP_STRING([--with-librdkafka=DIR],
+                            [use librdkafka library from (prefix) directory DIR]),,)
 patheval()
 {
         OLD=$1
@@ -982,6 +989,40 @@ if test "x$enable_redis" != "xno" && test "x$with_redis" != "no"; then
        enable_redis=$hiredis
 fi
 
+dnl ***************************************************************************
+dnl librdkafka headers/libraries
+dnl ***************************************************************************
+if test "x$enable_kafka" != "xno" && test "x$with_kafka" != "xno"; then
+       rdkafka="yes"
+       if test "x$with_librdkafka" != "xyes"; then
+               CFLAGS_SAVE="$CFLAGS"
+               LDFLAGS_SAVE="$LDFLAGS"
+               CFLAGS="$CFLAGS -I$with_librdkafka/include"
+               LDFLAGS="$LDFLAGS -L$with_librdkafka/lib"
+               AC_CHECK_HEADER(librdkafka/rdkafka.h, [RDKAFKA_CFLAGS="-I$with_librdkafka/include"
+                                                      RDKAFKA_LIBS="-L$with_librdkafka/lib -lrdkafka"], [rdkafka=no])
+               CFLAGS="$CFLAGS_SAVE"
+               LDFLAGS="$LDFLAGS_SAVE"
+       else
+               CFLAGS_SAVE="$CFLAGS"
+               LDFLAGS_SAVE="$LDFLAGS"
+               CFLAGS="$CFLAGS -I$with_librdkafka/include"
+               LDFLAGS="$LDFLAGS -L$with_librdkafka/lib"
+               AC_CHECK_HEADER(librdkafka/rdkafka.h, [RDKAFKA_CFLAGS="-I$with_librdkafka/include"
+                                                      RDKAFKA_LIBS="-L$with_librdkafka/lib -lrdkafka"], [rdkafka=no])
+               CFLAGS="$CFLAGS_SAVE"
+               LDFLAGS="$LDFLAGS_SAVE"
+       fi
+
+       if test "x$enable_kafka" = "xyes" && test "x$rdkafka" = "xno"; then
+               AC_MSG_ERROR(librdkafka not found)
+       fi
+
+       enable_kafka=$rdkafka
+       echo "libs: $RDKAFKA_LIBS"
+fi
+
+
 dnl ***************************************************************************
 dnl rabbitmq-c headers/libraries
 dnl ***************************************************************************
@@ -1278,6 +1319,7 @@ AM_CONDITIONAL(JSON_INTERNAL, [test "x$JSON_SUBDIRS" != "x"])
 AM_CONDITIONAL(LIBMONGO_INTERNAL, [test "x$LIBMONGO_SUBDIRS" != "x"])
 AM_CONDITIONAL(LIBRABBITMQ_INTERNAL, [test "x$LIBRABBITMQ_SUBDIRS" != "x"])
 AM_CONDITIONAL(ENABLE_MAN_PAGES, [test "x$enable_man_pages" = "xyes"])
+AM_CONDITIONAL(ENABLE_KAFKA, [test "x$enable_kafka" = "xyes"])
 
 # substitution into manual pages
 expanded_sysconfdir=[`patheval $sysconfdir | sed -e 's/-/\\\\-/g'`]
@@ -1377,3 +1419,4 @@ echo "  AMQP destination (module)   : ${enable_amqp:=no}"
 echo "  STOMP destination (module)  : ${enable_stomp:=no}"
 echo "  GEOIP support (module)      : ${enable_geoip:=no}"
 echo "  Redis support (module)      : ${enable_redis:=no}"
+echo "  Kafka support (module)      : ${enable_kafka:=no}"

lib/stats/stats-cluster.c

@@ -92,6 +92,7 @@ _get_module_name(gint source)
     "stomp",
     "redis",
     "snmp",
+    "kafka",
   };
   return module_names[source & SCS_SOURCE_MASK];
 }
@@ -119,7 +120,7 @@ stats_cluster_get_component_name(StatsCluster *self, gchar *buf, gsize buf_len)
     }
   else
     {
-      g_snprintf(buf, buf_len, "%s%s", 
+      g_snprintf(buf, buf_len, "%s%s",
                  _get_component_prefix(self->component),
                  _get_module_name(self->component));
       return buf;
@@ -164,7 +165,7 @@ StatsCluster *
 stats_cluster_new(gint component, const gchar *id, const gchar *instance)
 {
   StatsCluster *self = g_new0(StatsCluster, 1);
-      
+
   self->component = component;
   self->id = g_strdup(id ? : "");
   self->instance = g_strdup(instance ? : "");
@@ -174,7 +175,7 @@ stats_cluster_new(gint component, const gchar *id, const gchar *instance)
 
 void
 stats_cluster_free(StatsCluster *self)
-{ 
+{
   g_free(self->id);
   g_free(self->instance);
   g_free(self);

lib/stats/stats-cluster.h

@@ -42,7 +42,7 @@ enum
   /* direction bits, used to distinguish between source/destination drivers */
   SCS_SOURCE         = 0x0100,
   SCS_DESTINATION    = 0x0200,
-  
+
   /* drivers, this should be registered dynamically */
   SCS_FILE           = 1,
   SCS_PIPE           = 2,
@@ -76,6 +76,7 @@ enum
   SCS_STOMP          = 30,
   SCS_REDIS          = 31,
   SCS_SNMP           = 32,
+  SCS_KAFKA          = 33,
   SCS_MAX,
   SCS_SOURCE_MASK    = 0xff
 };

modules/Makefile.am

@@ -21,14 +21,15 @@ include modules/tfgeoip/Makefile.am
 include modules/afstomp/Makefile.am
 include modules/redis/Makefile.am
 include modules/pseudofile/Makefile.am
+include modules/kafka/Makefile.am
 
 SYSLOG_NG_MODULES	=	\
 	mod-afsocket mod-afstreams mod-affile mod-afprog \
 	mod-usertty mod-amqp mod-mongodb mod-smtp mod-json \
 	mod-syslogformat mod-linux-kmsg mod-pacctformat \
 	mod-confgen mod-system-source mod-csvparser mod-dbparser \
 	mod-basicfuncs mod-cryptofuncs mod-geoip mod-afstomp \
-	mod-redis mod-pseudofile
+	mod-redis mod-pseudofile mod-kafka
 
 modules modules/: ${SYSLOG_NG_MODULES}
 

modules/kafka/Makefile.am

@@ -0,0 +1,36 @@
+if ENABLE_KAFKA
+module_LTLIBRARIES			+=	\
+	modules/kafka/libkafka.la
+
+modules_kafka_libkafka_la_CFLAGS	=	\
+	$(RDKAFKA_CFLAGS)			\
+	-I$(top_srcdir)/modules/kafka		\
+	-I$(top_builddir)/modules/kafka
+modules_kafka_libkafka_la_SOURCES	=	\
+	modules/kafka/kafka-grammar.y 		\
+	modules/kafka/kafka.c			        \
+	modules/kafka/kafka.h						  \
+	modules/kafka/kafka-parser.h      \
+	modules/kafka/kafka-parser.c
+
+modules_kafka_libkafka_la_LIBADD	=	\
+	-lrdkafka $(RDKAFKA_LIBS) $(MODULE_DEPS_LIBS)
+modules_kafka_libkafka_la_LDFLAGS	=	\
+	$(MODULE_LDFLAGS)
+modules_kafka_libkafka_la_DEPENDENCIES	=	\
+	$(MODULE_DEPS_LIBS)
+
+modules/kafka modules/kafka/ mod-kafka: \
+	modules/kafka/libkafka.la
+else
+modules/kafka modules/kafka/ mod-kafka:
+endif
+
+BUILT_SOURCES				+=	\
+	modules/kafka/kafka-grammar.y		\
+	modules/kafka/kafka-grammar.c		\
+	modules/kafka/kafka-grammar.h
+EXTRA_DIST				+=	\
+	modules/kafka/kafka-grammar.ym
+
+.PHONY: modules/kafka/ mod-kafka

modules/kafka/crc32.c

@@ -0,0 +1,110 @@
+/*
+ *  COPYRIGHT (C) 1986 Gary S. Brown.  You may use this program, or
+ *  code or tables extracted from it, as desired without restriction.
+ *
+ *  First, the polynomial itself and its table of feedback terms.  The
+ *  polynomial is
+ *  X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0
+ *
+ *  Note that we take it "backwards" and put the highest-order term in
+ *  the lowest-order bit.  The X^32 term is "implied"; the LSB is the
+ *  X^31 term, etc.  The X^0 term (usually shown as "+1") results in
+ *  the MSB being 1
+ *
+ *  Note that the usual hardware shift register implementation, which
+ *  is what we're using (we're merely optimizing it by doing eight-bit
+ *  chunks at a time) shifts bits into the lowest-order term.  In our
+ *  implementation, that means shifting towards the right.  Why do we
+ *  do it this way?  Because the calculated CRC must be transmitted in
+ *  order from highest-order term to lowest-order term.  UARTs transmit
+ *  characters in order from LSB to MSB.  By storing the CRC this way
+ *  we hand it to the UART in the order low-byte to high-byte; the UART
+ *  sends each low-bit to hight-bit; and the result is transmission bit
+ *  by bit from highest- to lowest-order term without requiring any bit
+ *  shuffling on our part.  Reception works similarly
+ *
+ *  The feedback terms table consists of 256, 32-bit entries.  Notes
+ *
+ *      The table can be generated at runtime if desired; code to do so
+ *      is shown later.  It might not be obvious, but the feedback
+ *      terms simply represent the results of eight shift/xor opera
+ *      tions for all combinations of data and CRC register values
+ *
+ *      The values must be right-shifted by eight bits by the "updcrc
+ *      logic; the shift must be unsigned (bring in zeroes).  On some
+ *      hardware you could probably optimize the shift in assembler by
+ *      using byte-swap instructions
+ *      polynomial $edb88320
+ */
+
+#include <sys/types.h>
+
+u_int32_t               crc32(const u_char *, size_t);
+static unsigned int     crc32_tab[] = {
+	0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
+	0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
+	0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
+	0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
+	0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
+	0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
+	0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
+	0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
+	0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
+	0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
+	0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
+	0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
+	0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
+	0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
+	0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
+	0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
+	0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
+	0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
+	0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
+	0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
+	0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
+	0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
+	0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
+	0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
+	0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
+	0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
+	0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
+	0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
+	0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
+	0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
+	0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
+	0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
+	0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
+	0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
+	0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
+	0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
+	0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
+	0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
+	0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
+	0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
+	0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
+	0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
+	0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
+	0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
+	0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
+	0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
+	0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
+	0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
+	0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
+	0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
+	0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
+	0x2d02ef8dL
+};
+
+/* Return a 32-bit CRC of the contents of the buffer. */
+
+u_int32_t
+kafka_crc32(const u_char *s, size_t len)
+{
+    size_t      i;
+    u_int32_t   ret;
+
+    ret = 0;
+    for (i = 0;  i < len;  i++)
+        ret = crc32_tab[(ret ^ s[i]) & 0xff] ^ (ret >> 8);
+    return ret;
+}