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-rw-r--r--telemetry/kafka-collectd/write_kafka_line_protocol.c526
1 files changed, 526 insertions, 0 deletions
diff --git a/telemetry/kafka-collectd/write_kafka_line_protocol.c b/telemetry/kafka-collectd/write_kafka_line_protocol.c
new file mode 100644
index 000000000..5eb7b520d
--- /dev/null
+++ b/telemetry/kafka-collectd/write_kafka_line_protocol.c
@@ -0,0 +1,526 @@
+/**
+ * collectd - src/write_kafka.c
+ * Copyright (C) 2014 Pierre-Yves Ritschard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ * Pierre-Yves Ritschard <pyr at spootnik.org>
+ */
+
+#include <errno.h>
+#include <librdkafka/rdkafka.h>
+#include <stdint.h>
+
+#include "../data_model.h"
+#include "collectd.h"
+#include "format_influxdb.h"
+#include "plugin.h"
+#include "utils/cmds/putval.h"
+#include "utils/common/common.h"
+#include "utils/format_graphite/format_graphite.h"
+#include "utils/format_json/format_json.h"
+#include "utils_random.h"
+
+struct kafka_topic_context {
+#define KAFKA_FORMAT_JSON 0
+#define KAFKA_FORMAT_COMMAND 1
+#define KAFKA_FORMAT_GRAPHITE 2
+#define KAFKA_FORMAT_INFLUXDB 3
+ uint8_t format;
+ unsigned int graphite_flags;
+ bool store_rates;
+ rd_kafka_topic_conf_t *conf;
+ rd_kafka_topic_t *topic;
+ rd_kafka_conf_t *kafka_conf;
+ rd_kafka_t *kafka;
+ char *key;
+ char *prefix;
+ char *postfix;
+ char escape_char;
+ char *topic_name;
+ pthread_mutex_t lock;
+};
+
+static int kafka_handle(struct kafka_topic_context *);
+static int kafka_write(const data_set_t *, const value_list_t *, user_data_t *);
+static int32_t kafka_partition(const rd_kafka_topic_t *, const void *, size_t,
+ int32_t, void *, void *);
+
+/* Version 0.9.0 of librdkafka deprecates rd_kafka_set_logger() in favor of
+ * rd_kafka_conf_set_log_cb(). This is to make sure we're not using the
+ * deprecated function. */
+#ifdef HAVE_LIBRDKAFKA_LOG_CB
+#undef HAVE_LIBRDKAFKA_LOGGER
+#endif
+
+#if defined(HAVE_LIBRDKAFKA_LOGGER) || defined(HAVE_LIBRDKAFKA_LOG_CB)
+static void kafka_log(const rd_kafka_t *, int, const char *, const char *);
+
+static void kafka_log(const rd_kafka_t *rkt, int level, const char *fac,
+ const char *msg) {
+ plugin_log(level, "%s", msg);
+}
+#endif
+
+static rd_kafka_resp_err_t kafka_error() {
+#if RD_KAFKA_VERSION >= 0x000b00ff
+ return rd_kafka_last_error();
+#else
+ return rd_kafka_errno2err(errno);
+#endif
+}
+
+static uint32_t kafka_hash(const char *keydata, size_t keylen) {
+ uint32_t hash = 5381;
+ for (; keylen > 0; keylen--)
+ hash = ((hash << 5) + hash) + keydata[keylen - 1];
+ return hash;
+}
+
+/* 31 bit -> 4 byte -> 8 byte hex string + null byte */
+#define KAFKA_RANDOM_KEY_SIZE 9
+#define KAFKA_RANDOM_KEY_BUFFER \
+ (char[KAFKA_RANDOM_KEY_SIZE]) { "" }
+static char *kafka_random_key(char buffer[static KAFKA_RANDOM_KEY_SIZE]) {
+ ssnprintf(buffer, KAFKA_RANDOM_KEY_SIZE, "%08" PRIX32, cdrand_u());
+ return buffer;
+}
+
+static int32_t kafka_partition(const rd_kafka_topic_t *rkt, const void *keydata,
+ size_t keylen, int32_t partition_cnt, void *p,
+ void *m) {
+ uint32_t key = kafka_hash(keydata, keylen);
+ uint32_t target = key % partition_cnt;
+ int32_t i = partition_cnt;
+
+ while (--i > 0 && !rd_kafka_topic_partition_available(rkt, target)) {
+ target = (target + 1) % partition_cnt;
+ }
+ return target;
+}
+
+static int kafka_handle(struct kafka_topic_context *ctx) /* {{{ */
+{
+ char errbuf[1024];
+ rd_kafka_conf_t *conf;
+ rd_kafka_topic_conf_t *topic_conf;
+
+ if (ctx->kafka != NULL && ctx->topic != NULL) return 0;
+
+ if (ctx->kafka == NULL) {
+ if ((conf = rd_kafka_conf_dup(ctx->kafka_conf)) == NULL) {
+ ERROR("write_kafka plugin: cannot duplicate kafka config");
+ return 1;
+ }
+
+ if ((ctx->kafka = rd_kafka_new(RD_KAFKA_PRODUCER, conf, errbuf,
+ sizeof(errbuf))) == NULL) {
+ ERROR("write_kafka plugin: cannot create kafka handle.");
+ return 1;
+ }
+
+ rd_kafka_conf_destroy(ctx->kafka_conf);
+ ctx->kafka_conf = NULL;
+
+ INFO("write_kafka plugin: created KAFKA handle : %s",
+ rd_kafka_name(ctx->kafka));
+
+#if defined(HAVE_LIBRDKAFKA_LOGGER) && !defined(HAVE_LIBRDKAFKA_LOG_CB)
+ rd_kafka_set_logger(ctx->kafka, kafka_log);
+#endif
+ }
+
+ if (ctx->topic == NULL) {
+ if ((topic_conf = rd_kafka_topic_conf_dup(ctx->conf)) == NULL) {
+ ERROR("write_kafka plugin: cannot duplicate kafka topic config");
+ return 1;
+ }
+
+ if ((ctx->topic = rd_kafka_topic_new(ctx->kafka, ctx->topic_name,
+ topic_conf)) == NULL) {
+ ERROR("write_kafka plugin: cannot create topic : %s\n",
+ rd_kafka_err2str(kafka_error()));
+ return errno;
+ }
+
+ rd_kafka_topic_conf_destroy(ctx->conf);
+ ctx->conf = NULL;
+
+ INFO("write_kafka plugin: handle created for topic : %s",
+ rd_kafka_topic_name(ctx->topic));
+ }
+
+ return 0;
+
+} /* }}} int kafka_handle */
+
+static int kafka_write(const data_set_t *ds, /* {{{ */
+ const value_list_t *vl, user_data_t *ud) {
+ int status = 0;
+ void *key;
+ size_t keylen = 0;
+ char buffer[8192];
+ size_t bfree = sizeof(buffer);
+ size_t bfill = 0;
+ size_t blen = 0;
+ struct kafka_topic_context *ctx = ud->data;
+
+ if ((ds == NULL) || (vl == NULL) || (ctx == NULL)) return EINVAL;
+
+ pthread_mutex_lock(&ctx->lock);
+ status = kafka_handle(ctx);
+ pthread_mutex_unlock(&ctx->lock);
+ if (status != 0) return status;
+
+ bzero(buffer, sizeof(buffer));
+
+ switch (ctx->format) {
+ case KAFKA_FORMAT_COMMAND:
+ status = cmd_create_putval(buffer, sizeof(buffer), ds, vl);
+ if (status != 0) {
+ ERROR("write_kafka plugin: cmd_create_putval failed with status %i.",
+ status);
+ return status;
+ }
+ blen = strlen(buffer);
+ break;
+ case KAFKA_FORMAT_JSON:
+ format_json_initialize(buffer, &bfill, &bfree);
+ format_json_value_list(buffer, &bfill, &bfree, ds, vl, ctx->store_rates);
+ format_json_finalize(buffer, &bfill, &bfree);
+ blen = strlen(buffer);
+ break;
+ case KAFKA_FORMAT_GRAPHITE:
+ status =
+ format_graphite(buffer, sizeof(buffer), ds, vl, ctx->prefix,
+ ctx->postfix, ctx->escape_char, ctx->graphite_flags);
+ if (status != 0) {
+ ERROR("write_kafka plugin: format_graphite failed with status %i.",
+ status);
+ return status;
+ }
+ blen = strlen(buffer);
+ break;
+ case KAFKA_FORMAT_INFLUXDB: {
+ // Decide format depending on the topic
+ // (to handle multilple topics w/ different formats);
+ // Comment this part to use the stream topic as default for other
+ // collectd plugins (e.g. cpu, mem)
+ char *topic = NULL;
+ int rc = meta_data_get_string(vl->meta, KAFKA_TOPIC_KEY, &topic);
+ if (rc != 0 || topic == NULL) return 0;
+ if (strcasecmp(KAFKA_STREAM_TOPIC, topic) != 0) {
+ free(topic);
+ return 0;
+ }
+ meta_data_delete(vl->meta, KAFKA_TOPIC_KEY);
+
+ status =
+ format_influxdb_value_list(buffer, sizeof(buffer), ds, vl, false, NS);
+ if (status <= 0) {
+ ERROR("write_kafka plugin: format_influxdb failed with status %i.",
+ status);
+ return status;
+ }
+ blen = strlen(buffer);
+
+ // Print without newline
+ buffer[blen - 1] = 0;
+ INFO("%s", buffer);
+ buffer[blen - 1] = '\n';
+
+ break;
+ }
+ default:
+ ERROR("write_kafka plugin: invalid format %i.", ctx->format);
+ return -1;
+ }
+
+ key =
+ (ctx->key != NULL) ? ctx->key : kafka_random_key(KAFKA_RANDOM_KEY_BUFFER);
+ keylen = strlen(key);
+
+ rd_kafka_produce(ctx->topic, RD_KAFKA_PARTITION_UA, RD_KAFKA_MSG_F_COPY,
+ buffer, blen, key, keylen, NULL);
+
+ return status;
+} /* }}} int kafka_write */
+
+static void kafka_topic_context_free(void *p) /* {{{ */
+{
+ struct kafka_topic_context *ctx = p;
+
+ if (ctx == NULL) return;
+
+ if (ctx->topic_name != NULL) sfree(ctx->topic_name);
+ if (ctx->topic != NULL) rd_kafka_topic_destroy(ctx->topic);
+ if (ctx->conf != NULL) rd_kafka_topic_conf_destroy(ctx->conf);
+ if (ctx->kafka_conf != NULL) rd_kafka_conf_destroy(ctx->kafka_conf);
+ if (ctx->kafka != NULL) rd_kafka_destroy(ctx->kafka);
+
+ sfree(ctx);
+} /* }}} void kafka_topic_context_free */
+
+static void kafka_config_topic(rd_kafka_conf_t *conf,
+ oconfig_item_t *ci) /* {{{ */
+{
+ int status;
+ struct kafka_topic_context *tctx;
+ char *key = NULL;
+ char *val;
+ char callback_name[DATA_MAX_NAME_LEN];
+ char errbuf[1024];
+ oconfig_item_t *child;
+ rd_kafka_conf_res_t ret;
+
+ if ((tctx = calloc(1, sizeof(*tctx))) == NULL) {
+ ERROR("write_kafka plugin: calloc failed.");
+ return;
+ }
+
+ tctx->escape_char = '.';
+ tctx->store_rates = true;
+ tctx->format = KAFKA_FORMAT_JSON;
+ tctx->key = NULL;
+
+ if ((tctx->kafka_conf = rd_kafka_conf_dup(conf)) == NULL) {
+ sfree(tctx);
+ ERROR("write_kafka plugin: cannot allocate memory for kafka config");
+ return;
+ }
+
+#ifdef HAVE_LIBRDKAFKA_LOG_CB
+ rd_kafka_conf_set_log_cb(tctx->kafka_conf, kafka_log);
+#endif
+
+ if ((tctx->conf = rd_kafka_topic_conf_new()) == NULL) {
+ rd_kafka_conf_destroy(tctx->kafka_conf);
+ sfree(tctx);
+ ERROR("write_kafka plugin: cannot create topic configuration.");
+ return;
+ }
+
+ if (ci->values_num != 1) {
+ WARNING("kafka topic name needed.");
+ goto errout;
+ }
+
+ if (ci->values[0].type != OCONFIG_TYPE_STRING) {
+ WARNING("kafka topic needs a string argument.");
+ goto errout;
+ }
+
+ if ((tctx->topic_name = strdup(ci->values[0].value.string)) == NULL) {
+ ERROR("write_kafka plugin: cannot copy topic name.");
+ goto errout;
+ }
+
+ for (int i = 0; i < ci->children_num; i++) {
+ /*
+ * The code here could be simplified but makes room
+ * for easy adding of new options later on.
+ */
+ child = &ci->children[i];
+ status = 0;
+
+ if (strcasecmp("Property", child->key) == 0) {
+ if (child->values_num != 2) {
+ WARNING("kafka properties need both a key and a value.");
+ goto errout;
+ }
+ if (child->values[0].type != OCONFIG_TYPE_STRING ||
+ child->values[1].type != OCONFIG_TYPE_STRING) {
+ WARNING("kafka properties needs string arguments.");
+ goto errout;
+ }
+ key = child->values[0].value.string;
+ val = child->values[1].value.string;
+ ret =
+ rd_kafka_topic_conf_set(tctx->conf, key, val, errbuf, sizeof(errbuf));
+ if (ret != RD_KAFKA_CONF_OK) {
+ WARNING("cannot set kafka topic property %s to %s: %s.", key, val,
+ errbuf);
+ goto errout;
+ }
+
+ } else if (strcasecmp("Key", child->key) == 0) {
+ if (cf_util_get_string(child, &tctx->key) != 0) continue;
+ if (strcasecmp("Random", tctx->key) == 0) {
+ sfree(tctx->key);
+ tctx->key = strdup(kafka_random_key(KAFKA_RANDOM_KEY_BUFFER));
+ }
+ } else if (strcasecmp("Format", child->key) == 0) {
+ status = cf_util_get_string(child, &key);
+ if (status != 0) goto errout;
+
+ assert(key != NULL);
+
+ if (strcasecmp(key, "Command") == 0) {
+ tctx->format = KAFKA_FORMAT_COMMAND;
+
+ } else if (strcasecmp(key, "Graphite") == 0) {
+ tctx->format = KAFKA_FORMAT_GRAPHITE;
+
+ } else if (strcasecmp(key, "Json") == 0) {
+ tctx->format = KAFKA_FORMAT_JSON;
+
+ } else if (strcasecmp(key, "InfluxDB") == 0) {
+ tctx->format = KAFKA_FORMAT_INFLUXDB;
+
+ } else {
+ WARNING("write_kafka plugin: Invalid format string: %s", key);
+ }
+
+ sfree(key);
+
+ } else if (strcasecmp("StoreRates", child->key) == 0) {
+ status = cf_util_get_boolean(child, &tctx->store_rates);
+ (void)cf_util_get_flag(child, &tctx->graphite_flags,
+ GRAPHITE_STORE_RATES);
+
+ } else if (strcasecmp("GraphiteSeparateInstances", child->key) == 0) {
+ status = cf_util_get_flag(child, &tctx->graphite_flags,
+ GRAPHITE_SEPARATE_INSTANCES);
+
+ } else if (strcasecmp("GraphiteAlwaysAppendDS", child->key) == 0) {
+ status = cf_util_get_flag(child, &tctx->graphite_flags,
+ GRAPHITE_ALWAYS_APPEND_DS);
+
+ } else if (strcasecmp("GraphitePreserveSeparator", child->key) == 0) {
+ status = cf_util_get_flag(child, &tctx->graphite_flags,
+ GRAPHITE_PRESERVE_SEPARATOR);
+
+ } else if (strcasecmp("GraphiteUseTags", child->key) == 0) {
+ status =
+ cf_util_get_flag(child, &tctx->graphite_flags, GRAPHITE_USE_TAGS);
+
+ } else if (strcasecmp("GraphitePrefix", child->key) == 0) {
+ status = cf_util_get_string(child, &tctx->prefix);
+ } else if (strcasecmp("GraphitePostfix", child->key) == 0) {
+ status = cf_util_get_string(child, &tctx->postfix);
+ } else if (strcasecmp("GraphiteEscapeChar", child->key) == 0) {
+ char *tmp_buff = NULL;
+ status = cf_util_get_string(child, &tmp_buff);
+ if (strlen(tmp_buff) > 1)
+ WARNING(
+ "write_kafka plugin: The option \"GraphiteEscapeChar\" handles "
+ "only one character. Others will be ignored.");
+ tctx->escape_char = tmp_buff[0];
+ sfree(tmp_buff);
+ } else {
+ WARNING("write_kafka plugin: Invalid directive: %s.", child->key);
+ }
+
+ if (status != 0) break;
+ }
+
+ rd_kafka_topic_conf_set_partitioner_cb(tctx->conf, kafka_partition);
+ rd_kafka_topic_conf_set_opaque(tctx->conf, tctx);
+
+ ssnprintf(callback_name, sizeof(callback_name), "write_kafka/%s",
+ tctx->topic_name);
+
+ status = plugin_register_write(callback_name, kafka_write,
+ &(user_data_t){
+ .data = tctx,
+ .free_func = kafka_topic_context_free,
+ });
+ if (status != 0) {
+ WARNING(
+ "write_kafka plugin: plugin_register_write (\"%s\") "
+ "failed with status %i.",
+ callback_name, status);
+ goto errout;
+ }
+
+ pthread_mutex_init(&tctx->lock, /* attr = */ NULL);
+
+ return;
+errout:
+ if (tctx->topic_name != NULL) free(tctx->topic_name);
+ if (tctx->conf != NULL) rd_kafka_topic_conf_destroy(tctx->conf);
+ if (tctx->kafka_conf != NULL) rd_kafka_conf_destroy(tctx->kafka_conf);
+ sfree(tctx);
+} /* }}} int kafka_config_topic */
+
+static int kafka_config(oconfig_item_t *ci) /* {{{ */
+{
+ oconfig_item_t *child;
+ rd_kafka_conf_t *conf;
+ rd_kafka_conf_res_t ret;
+ char errbuf[1024];
+
+ if ((conf = rd_kafka_conf_new()) == NULL) {
+ WARNING("cannot allocate kafka configuration.");
+ return -1;
+ }
+ for (int i = 0; i < ci->children_num; i++) {
+ child = &ci->children[i];
+
+ if (strcasecmp("Topic", child->key) == 0) {
+ kafka_config_topic(conf, child);
+ } else if (strcasecmp(child->key, "Property") == 0) {
+ char *key = NULL;
+ char *val = NULL;
+
+ if (child->values_num != 2) {
+ WARNING("kafka properties need both a key and a value.");
+ goto errout;
+ }
+ if (child->values[0].type != OCONFIG_TYPE_STRING ||
+ child->values[1].type != OCONFIG_TYPE_STRING) {
+ WARNING("kafka properties needs string arguments.");
+ goto errout;
+ }
+ if ((key = strdup(child->values[0].value.string)) == NULL) {
+ WARNING("cannot allocate memory for attribute key.");
+ goto errout;
+ }
+ if ((val = strdup(child->values[1].value.string)) == NULL) {
+ WARNING("cannot allocate memory for attribute value.");
+ sfree(key);
+ goto errout;
+ }
+ ret = rd_kafka_conf_set(conf, key, val, errbuf, sizeof(errbuf));
+ if (ret != RD_KAFKA_CONF_OK) {
+ WARNING("cannot set kafka property %s to %s: %s", key, val, errbuf);
+ sfree(key);
+ sfree(val);
+ goto errout;
+ }
+ sfree(key);
+ sfree(val);
+ } else {
+ WARNING(
+ "write_kafka plugin: Ignoring unknown "
+ "configuration option \"%s\" at top level.",
+ child->key);
+ }
+ }
+ if (conf != NULL) rd_kafka_conf_destroy(conf);
+ return 0;
+errout:
+ if (conf != NULL) rd_kafka_conf_destroy(conf);
+ return -1;
+} /* }}} int kafka_config */
+
+void module_register(void) {
+ plugin_register_complex_config("write_kafka_line_protocol", kafka_config);
+}