CONTRIB: opentracing: add the OpenTracing filter
This commit adds the OpenTracing filter (hereinafter we will use the
abbreviated name 'the OT filter') to the contrib tree.
The OT filter adds native support for using distributed tracing in HAProxy.
This is enabled by sending an OpenTracing compliant request to one of the
supported tracers; such as Datadog, Jaeger, Lightstep and Zipkin tracers.
Please note: tracers are not listed by any preference, but alphabetically.
The OT filter is a standard HAProxy filter, so what applies to others also
applies to this one (of course, by that I mean what is described in the
documentation, more precisely in the doc/internals/filters.txt file).
The OT filter activation is done explicitly by specifying it in the HAProxy
configuration. If this is not done, the OT filter in no way participates
in the work of HAProxy.
As for the impact on HAProxy speed, this is documented with several tests
located in the test directory, and the result is found in the README-speed-*
files. In short, the speed of operation depends on the way it is used and
the complexity of the configuration, from an almost immeasurable impact to
a significant deceleration (5x and more). I think that in some normal use
the speed of HAProxy with the filter on will be quite satisfactory with a
slowdown of less than 4%.
The OT filter allows intensive use of ACLs, which can be defined anywhere in
the configuration. Thus, it is possible to use the filter only for those
connections that are of interest to us.
More detailed documentation related to the operation, configuration and use
of the filter can be found in the contrib/opentracing directory.
To make the OpenTracing filter easier to configure and compile, several
entries have been added to the Makefile. When running the make utility,
it is possible to use several new arguments:
USE_OT=1 : enable the OpenTracing filter
OT_DEBUG=1 : compile the OpenTracing filter in debug mode
OT_INC=path : force the include path to libopentracing-c-wrapper
OT_LIB=path : force the lib path to libopentracing-c-wrapper
OT_RUNPATH=1 : add libopentracing-c-wrapper RUNPATH to haproxy executable
If USE_OT is set, then an additional Makefile from the contrib/opentracing
directory is included in the compilation process.
diff --git a/contrib/opentracing/src/util.c b/contrib/opentracing/src/util.c
new file mode 100644
index 0000000..3adc5a3
--- /dev/null
+++ b/contrib/opentracing/src/util.c
@@ -0,0 +1,793 @@
+/***
+ * Copyright 2020 HAProxy Technologies
+ *
+ * This file is part of the HAProxy OpenTracing filter.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+#include "include.h"
+
+
+#ifdef DEBUG_OT
+
+/***
+ * NAME
+ * flt_ot_args_dump -
+ *
+ * ARGUMENTS
+ * args -
+ *
+ * DESCRIPTION
+ * -
+ *
+ * RETURN VALUE
+ * This function does not return a value.
+ */
+void flt_ot_args_dump(char **args)
+{
+ int i, n;
+
+ for (n = 1; FLT_OT_ARG_ISVALID(n); n++);
+
+ (void)fprintf(stderr, FLT_OT_DBG_FMT("%.*sargs[%d]: { '%s' "), dbg_indent_level, FLT_OT_DBG_INDENT, n, args[0]);
+
+ for (i = 1; FLT_OT_ARG_ISVALID(i); i++)
+ (void)fprintf(stderr, "'%s' ", args[i]);
+
+ (void)fprintf(stderr, "}\n");
+}
+
+
+/***
+ * NAME
+ * flt_ot_filters_dump -
+ *
+ * ARGUMENTS
+ * This function takes no arguments.
+ *
+ * DESCRIPTION
+ * -
+ *
+ * RETURN VALUE
+ * This function does not return a value.
+ */
+void flt_ot_filters_dump(void)
+{
+ struct flt_conf *fconf;
+ struct proxy *px;
+
+ FLT_OT_FUNC("");
+
+ for (px = proxies_list; px != NULL; px = px->next) {
+ FLT_OT_DBG(2, "proxy '%s'", px->id);
+
+ list_for_each_entry(fconf, &(px->filter_configs), list)
+ if (fconf->id == ot_flt_id) {
+ struct flt_ot_conf *conf = fconf->conf;
+
+ FLT_OT_DBG(2, " OT filter '%s'", conf->id);
+ }
+ }
+
+ FLT_OT_RETURN();
+}
+
+
+/***
+ * NAME
+ * flt_ot_chn_label -
+ *
+ * ARGUMENTS
+ * chn -
+ *
+ * DESCRIPTION
+ * -
+ *
+ * RETURN VALUE
+ * -
+ */
+const char *flt_ot_chn_label(const struct channel *chn)
+{
+ return (chn->flags & CF_ISRESP) ? "RESponse" : "REQuest";
+}
+
+
+/***
+ * NAME
+ * flt_ot_pr_mode -
+ *
+ * ARGUMENTS
+ * s -
+ *
+ * DESCRIPTION
+ * -
+ *
+ * RETURN VALUE
+ * -
+ */
+const char *flt_ot_pr_mode(const struct stream *s)
+{
+ struct proxy *px = (s->flags & SF_BE_ASSIGNED) ? s->be : strm_fe(s);
+
+ return (px->mode == PR_MODE_HTTP) ? "HTTP" : "TCP";
+}
+
+
+/***
+ * NAME
+ * flt_ot_stream_pos -
+ *
+ * ARGUMENTS
+ * s -
+ *
+ * DESCRIPTION
+ * -
+ *
+ * RETURN VALUE
+ * -
+ */
+const char *flt_ot_stream_pos(const struct stream *s)
+{
+ return (s->flags & SF_BE_ASSIGNED) ? "backend" : "frontend";
+}
+
+
+/***
+ * NAME
+ * flt_ot_type -
+ *
+ * ARGUMENTS
+ * f -
+ *
+ * DESCRIPTION
+ * -
+ *
+ * RETURN VALUE
+ * -
+ */
+const char *flt_ot_type(const struct filter *f)
+{
+ return (f->flags & FLT_FL_IS_BACKEND_FILTER) ? "backend" : "frontend";
+}
+
+
+/***
+ * NAME
+ * flt_ot_analyzer -
+ *
+ * ARGUMENTS
+ * an_bit -
+ *
+ * DESCRIPTION
+ * -
+ *
+ * RETURN VALUE
+ * -
+ */
+const char *flt_ot_analyzer(uint an_bit)
+{
+#define FLT_OT_AN_DEF(a) { a, #a },
+ static const struct {
+ uint an_bit;
+ const char *str;
+ } flt_ot_an[] = { FLT_OT_AN_DEFINES };
+#undef FLT_OT_AN_DEF
+ const char *retptr = "invalid an_bit";
+ int i;
+
+ for (i = 0; i < FLT_OT_TABLESIZE(flt_ot_an); i++)
+ if (flt_ot_an[i].an_bit == an_bit) {
+ retptr = flt_ot_an[i].str;
+
+ break;
+ }
+
+ return retptr;
+}
+
+
+/***
+ * NAME
+ * flt_ot_str_hex -
+ *
+ * ARGUMENTS
+ * data -
+ * size -
+ *
+ * DESCRIPTION
+ * -
+ *
+ * RETURN VALUE
+ * -
+ */
+const char *flt_ot_str_hex(const void *data, size_t size)
+{
+ static THREAD_LOCAL char retbuf[BUFSIZ];
+ const uint8_t *ptr = data;
+ size_t i;
+
+ if (data == NULL)
+ return "(null)";
+ else if (size == 0)
+ return "()";
+
+ for (i = 0, size <<= 1; (i < (sizeof(retbuf) - 2)) && (i < size); ptr++) {
+ retbuf[i++] = FLT_OT_NIBBLE_TO_HEX(*ptr >> 4);
+ retbuf[i++] = FLT_OT_NIBBLE_TO_HEX(*ptr & 0x0f);
+ }
+
+ retbuf[i] = '\0';
+
+ return retbuf;
+}
+
+
+/***
+ * NAME
+ * flt_ot_str_ctrl -
+ *
+ * ARGUMENTS
+ * data -
+ * size -
+ *
+ * DESCRIPTION
+ * -
+ *
+ * RETURN VALUE
+ * -
+ */
+const char *flt_ot_str_ctrl(const void *data, size_t size)
+{
+ static THREAD_LOCAL char retbuf[BUFSIZ];
+ const uint8_t *ptr = data;
+ size_t i, n = 0;
+
+ if (data == NULL)
+ return "(null)";
+ else if (size == 0)
+ return "()";
+
+ for (i = 0; (n < (sizeof(retbuf) - 1)) && (i < size); i++)
+ retbuf[n++] = ((ptr[i] >= 0x20) && (ptr[i] <= 0x7e)) ? ptr[i] : '.';
+
+ retbuf[n] = '\0';
+
+ return retbuf;
+}
+
+
+/***
+ * NAME
+ * flt_ot_list_debug -
+ *
+ * ARGUMENTS
+ * head -
+ *
+ * DESCRIPTION
+ * -
+ *
+ * RETURN VALUE
+ * -
+ */
+const char *flt_ot_list_debug(const struct list *head)
+{
+ FLT_OT_BUFFER_THR(retbuf, 4, 64, retptr);
+
+ if ((head == NULL) || LIST_ISEMPTY(head)) {
+ (void)strncpy(retptr, (head == NULL) ? "{ null list }" : "{ empty list }", sizeof(retbuf[0]));
+ }
+ else if (head->p == head->n) {
+ (void)snprintf(retptr, sizeof(retbuf[0]), "{ %p * 1 }", head->p);
+ }
+ else {
+ const struct list *ptr;
+ size_t count = 0;
+
+ for (ptr = head->n; ptr != head; ptr = ptr->n, count++);
+
+ (void)snprintf(retptr, sizeof(retbuf[0]), "{ %p %p %zu }", head->p, head->n, count);
+ }
+
+ return (retptr);
+}
+
+#endif /* DEBUG_OT */
+
+
+/***
+ * NAME
+ * flt_ot_chunk_add -
+ *
+ * ARGUMENTS
+ * chk -
+ * src -
+ * n -
+ * err -
+ *
+ * DESCRIPTION
+ * -
+ *
+ * RETURN VALUE
+ * -
+ */
+ssize_t flt_ot_chunk_add(struct buffer *chk, const void *src, size_t n, char **err)
+{
+ FLT_OT_FUNC("%p, %p, %zu, %p:%p", chk, src, n, FLT_OT_DPTR_ARGS(err));
+
+ if ((chk == NULL) || (src == NULL))
+ FLT_OT_RETURN(-1);
+
+ if (chk->area == NULL)
+ chunk_init(chk, FLT_OT_CALLOC(1, global.tune.bufsize), global.tune.bufsize);
+
+ if (chk->area == NULL) {
+ FLT_OT_ERR("out of memory");
+
+ FLT_OT_RETURN(-1);
+ }
+ else if (n > (chk->size - chk->data)) {
+ FLT_OT_ERR("chunk size too small");
+
+ FLT_OT_RETURN(-1);
+ }
+
+ (void)memcpy(chk->area + chk->data, src, n);
+ chk->data += n;
+
+ FLT_OT_RETURN(chk->data);
+}
+
+
+/***
+ * NAME
+ * flt_ot_args_count -
+ *
+ * ARGUMENTS
+ * args -
+ *
+ * DESCRIPTION
+ * -
+ *
+ * RETURN VALUE
+ * -
+ */
+int flt_ot_args_count(char **args)
+{
+ int retval = 0;
+
+ if (args != NULL)
+ for ( ; FLT_OT_ARG_ISVALID(retval); retval++);
+
+ return retval;
+}
+
+
+/***
+ * NAME
+ * flt_ot_args_to_str -
+ *
+ * ARGUMENTS
+ * args -
+ * idx -
+ * str -
+ *
+ * DESCRIPTION
+ * -
+ *
+ * RETURN VALUE
+ * This function does not return a value.
+ */
+void flt_ot_args_to_str(char **args, int idx, char **str)
+{
+ int i;
+
+ if ((args == NULL) || (*args == NULL))
+ return;
+
+ for (i = idx; FLT_OT_ARG_ISVALID(i); i++)
+ (void)memprintf(str, "%s%s%s", (*str == NULL) ? "" : *str, (i == idx) ? "" : " ", args[i]);
+}
+
+
+/***
+ * NAME
+ * flt_ot_strtod -
+ *
+ * ARGUMENTS
+ * nptr -
+ * limit_min -
+ * limit_max -
+ * err -
+ *
+ * DESCRIPTION
+ * -
+ *
+ * RETURN VALUE
+ * -
+ */
+double flt_ot_strtod(const char *nptr, double limit_min, double limit_max, char **err)
+{
+ char *endptr = NULL;
+ double retval;
+
+ errno = 0;
+
+ retval = strtod(nptr, &endptr);
+ if ((errno != 0) || FLT_OT_STR_ISVALID(endptr))
+ FLT_OT_ERR("'%s' : invalid value", nptr);
+ else if (!FLT_OT_IN_RANGE(retval, limit_min, limit_max))
+ FLT_OT_ERR("'%s' : value out of range [%.2f, %.2f]", nptr, limit_min, limit_max);
+
+ return retval;
+}
+
+
+/***
+ * NAME
+ * flt_ot_strtoll -
+ *
+ * ARGUMENTS
+ * nptr -
+ * limit_min -
+ * limit_max -
+ * err -
+ *
+ * DESCRIPTION
+ * -
+ *
+ * RETURN VALUE
+ * -
+ */
+int64_t flt_ot_strtoll(const char *nptr, int64_t limit_min, int64_t limit_max, char **err)
+{
+ char *endptr = NULL;
+ int64_t retval;
+
+ errno = 0;
+
+ retval = strtoll(nptr, &endptr, 0);
+ if ((errno != 0) || FLT_OT_STR_ISVALID(endptr))
+ FLT_OT_ERR("'%s' : invalid value", nptr);
+ else if (!FLT_OT_IN_RANGE(retval, limit_min, limit_max))
+ FLT_OT_ERR("'%s' : value out of range [%" PRId64 ", %" PRId64 "]", nptr, limit_min, limit_max);
+
+ return retval;
+}
+
+
+/***
+ * NAME
+ * flt_ot_sample_to_str -
+ *
+ * ARGUMENTS
+ * data -
+ * value -
+ * size -
+ * err -
+ *
+ * DESCRIPTION
+ * -
+ *
+ * RETURN VALUE
+ * -
+ */
+int flt_ot_sample_to_str(const struct sample_data *data, char *value, size_t size, char **err)
+{
+ int retval = -1;
+
+ FLT_OT_FUNC("%p, %p, %zu, %p:%p", data, value, size, FLT_OT_DPTR_ARGS(err));
+
+ if ((data == NULL) || (value == NULL) || (size == 0))
+ FLT_OT_RETURN(retval);
+
+ *value = '\0';
+
+ if (data->type == SMP_T_ANY) {
+ FLT_OT_ERR("invalid sample data type %d", data->type);
+ }
+ else if (data->type == SMP_T_BOOL) {
+ value[0] = data->u.sint ? '1' : '0';
+ value[1] = '\0';
+
+ retval = 1;
+ }
+ else if (data->type == SMP_T_SINT) {
+ retval = snprintf(value, size, "%lld", data->u.sint);
+ }
+ else if (data->type == SMP_T_ADDR) {
+ /* This type is never used to qualify a sample. */
+ }
+ else if (data->type == SMP_T_IPV4) {
+ if (INET_ADDRSTRLEN > size)
+ FLT_OT_ERR("sample data size too large");
+ else if (inet_ntop(AF_INET, &(data->u.ipv4), value, INET_ADDRSTRLEN) == NULL)
+ FLT_OT_ERR("invalid IPv4 address");
+ else
+ retval = strlen(value);
+ }
+ else if (data->type == SMP_T_IPV6) {
+ if (INET6_ADDRSTRLEN > size)
+ FLT_OT_ERR("sample data size too large");
+ else if (inet_ntop(AF_INET6, &(data->u.ipv6), value, INET6_ADDRSTRLEN) == NULL)
+ FLT_OT_ERR("invalid IPv6 address");
+ else
+ retval = strlen(value);
+ }
+ else if (data->type == SMP_T_STR) {
+ if (data->u.str.data >= size) {
+ FLT_OT_ERR("sample data size too large");
+ }
+ else if (data->u.str.data > 0) {
+ retval = data->u.str.data;
+
+ (void)strncat(value, data->u.str.area, retval);
+ }
+ else {
+ /*
+ * There is no content to add but we will still return
+ * the correct status.
+ */
+ retval = 0;
+ }
+ }
+ else if (data->type == SMP_T_BIN) {
+ FLT_OT_ERR("invalid sample data type %d", data->type);
+ }
+ else if (data->type != SMP_T_METH) {
+ FLT_OT_ERR("invalid sample data type %d", data->type);
+ }
+ else if (data->u.meth.meth == HTTP_METH_OPTIONS) {
+ retval = FLT_OT_STR_SIZE(HTTP_METH_STR_OPTIONS);
+
+ (void)memcpy(value, HTTP_METH_STR_OPTIONS, retval + 1);
+ }
+ else if (data->u.meth.meth == HTTP_METH_GET) {
+ retval = FLT_OT_STR_SIZE(HTTP_METH_STR_GET);
+
+ (void)memcpy(value, HTTP_METH_STR_GET, retval + 1);
+ }
+ else if (data->u.meth.meth == HTTP_METH_HEAD) {
+ retval = FLT_OT_STR_SIZE(HTTP_METH_STR_HEAD);
+
+ (void)memcpy(value, HTTP_METH_STR_HEAD, retval + 1);
+ }
+ else if (data->u.meth.meth == HTTP_METH_POST) {
+ retval = FLT_OT_STR_SIZE(HTTP_METH_STR_POST);
+
+ (void)memcpy(value, HTTP_METH_STR_POST, retval + 1);
+ }
+ else if (data->u.meth.meth == HTTP_METH_PUT) {
+ retval = FLT_OT_STR_SIZE(HTTP_METH_STR_PUT);
+
+ (void)memcpy(value, HTTP_METH_STR_PUT, retval + 1);
+ }
+ else if (data->u.meth.meth == HTTP_METH_DELETE) {
+ retval = FLT_OT_STR_SIZE(HTTP_METH_STR_DELETE);
+
+ (void)memcpy(value, HTTP_METH_STR_DELETE, retval + 1);
+ }
+ else if (data->u.meth.meth == HTTP_METH_TRACE) {
+ retval = FLT_OT_STR_SIZE(HTTP_METH_STR_TRACE);
+
+ (void)memcpy(value, HTTP_METH_STR_TRACE, retval + 1);
+ }
+ else if (data->u.meth.meth == HTTP_METH_CONNECT) {
+ retval = FLT_OT_STR_SIZE(HTTP_METH_STR_CONNECT);
+
+ (void)memcpy(value, HTTP_METH_STR_CONNECT, retval + 1);
+ }
+ else if (data->u.meth.meth == HTTP_METH_OTHER) {
+ if (data->u.meth.str.data >= size) {
+ FLT_OT_ERR("sample data size too large");
+ } else {
+ retval = data->u.meth.str.data;
+
+ (void)strncat(value, data->u.meth.str.area, retval);
+ }
+ }
+ else {
+ FLT_OT_ERR("invalid HTTP method");
+ }
+
+ FLT_OT_RETURN(retval);
+}
+
+
+/***
+ * NAME
+ * flt_ot_sample_to_value -
+ *
+ * ARGUMENTS
+ * key -
+ * data -
+ * value -
+ * err -
+ *
+ * DESCRIPTION
+ * -
+ *
+ * RETURN VALUE
+ * -
+ */
+int flt_ot_sample_to_value(const char *key, const struct sample_data *data, struct otc_value *value, char **err)
+{
+ int retval = -1;
+
+ FLT_OT_FUNC("\"%s\", %p, %p, %p:%p", key, data, value, FLT_OT_DPTR_ARGS(err));
+
+ if ((data == NULL) || (value == NULL))
+ FLT_OT_RETURN(retval);
+
+ if (data->type == SMP_T_BOOL) {
+ value->type = otc_value_bool;
+ value->value.bool_value = data->u.sint ? 1 : 0;
+
+ retval = sizeof(value->value.bool_value);
+ }
+ else if (data->type == SMP_T_SINT) {
+ value->type = otc_value_int64;
+ value->value.int64_value = data->u.sint;
+
+ retval = sizeof(value->value.int64_value);
+ }
+ else {
+ value->type = otc_value_string;
+ value->value.string_value = FLT_OT_MALLOC(global.tune.bufsize);
+
+ if (value->value.string_value == NULL)
+ FLT_OT_ERR("out of memory");
+ else
+ retval = flt_ot_sample_to_str(data, (char *)value->value.string_value, global.tune.bufsize, err);
+ }
+
+ FLT_OT_RETURN(retval);
+}
+
+
+/***
+ * NAME
+ * flt_ot_sample_add -
+ *
+ * ARGUMENTS
+ * s -
+ * dir -
+ * sample -
+ * data -
+ * type -
+ * err -
+ *
+ * DESCRIPTION
+ * -
+ *
+ * RETURN VALUE
+ * Returns a negative value if an error occurs, 0 if it needs to wait,
+ * any other value otherwise.
+ */
+int flt_ot_sample_add(struct stream *s, uint dir, struct flt_ot_conf_sample *sample, struct flt_ot_scope_data *data, int type, char **err)
+{
+ const struct flt_ot_conf_sample_expr *expr;
+ struct sample smp;
+ struct otc_value value;
+ struct buffer buffer;
+ int idx = 0, rc, retval = FLT_OT_RET_OK;
+
+ FLT_OT_FUNC("%p, %u, %p, %p, %d, %p:%p", s, dir, data, sample, type, FLT_OT_DPTR_ARGS(err));
+
+ FLT_OT_DBG_CONF_SAMPLE("sample ", sample);
+
+ (void)memset(&buffer, 0, sizeof(buffer));
+
+ list_for_each_entry(expr, &(sample->exprs), list) {
+ FLT_OT_DBG_CONF_SAMPLE_EXPR("sample expression ", expr);
+
+ (void)memset(&smp, 0, sizeof(smp));
+
+ /*
+ * If we have only one expression to process, then the data
+ * type that is the result of the expression is converted to
+ * an equivalent data type (if possible) that is written to
+ * the tracer.
+ *
+ * If conversion is not possible, or if we have multiple
+ * expressions to process, then the result is converted to
+ * a string and as such sent to the tracer.
+ */
+ if (sample_process(s->be, s->sess, s, dir | SMP_OPT_FINAL, expr->expr, &smp) != NULL) {
+ FLT_OT_DBG(3, "data type %d: '%s'", smp.data.type, expr->value);
+ } else {
+ FLT_OT_DBG(2, "WARNING: failed to fetch '%s' value", expr->value);
+
+ /*
+ * In case the fetch failed, we will set the result
+ * (sample) to an empty static string.
+ */
+ (void)memset(&(smp.data), 0, sizeof(smp.data));
+ smp.data.type = SMP_T_STR;
+ smp.data.u.str.area = "";
+ }
+
+ if ((sample->num_exprs == 1) && (type == FLT_OT_EVENT_SAMPLE_TAG)) {
+ if (flt_ot_sample_to_value(sample->key, &(smp.data), &value, err) == -1)
+ retval = FLT_OT_RET_ERROR;
+ } else {
+ if (buffer.area == NULL) {
+ chunk_init(&buffer, FLT_OT_CALLOC(1, global.tune.bufsize), global.tune.bufsize);
+ if (buffer.area == NULL) {
+ FLT_OT_ERR("out of memory");
+
+ retval = FLT_OT_RET_ERROR;
+
+ break;
+ }
+ }
+
+ rc = flt_ot_sample_to_str(&(smp.data), buffer.area + buffer.data, buffer.size - buffer.data, err);
+ if (rc == -1) {
+ retval = FLT_OT_RET_ERROR;
+ } else {
+ buffer.data += rc;
+
+ if (sample->num_exprs == ++idx) {
+ value.type = otc_value_string;
+ value.value.string_value = buffer.area;
+ }
+ }
+ }
+ }
+
+ if (retval == FLT_OT_RET_ERROR) {
+ /* Do nothing. */
+ }
+ else if (type == FLT_OT_EVENT_SAMPLE_TAG) {
+ struct otc_tag *tag = data->tags + data->num_tags++;
+
+ tag->key = sample->key;
+ (void)memcpy(&(tag->value), &value, sizeof(tag->value));
+ }
+ else if (type == FLT_OT_EVENT_SAMPLE_LOG) {
+ struct otc_log_field *log_field = data->log_fields + data->num_log_fields++;
+
+ log_field->key = sample->key;
+ (void)memcpy(&(log_field->value), &value, sizeof(log_field->value));
+ }
+ else {
+ if (data->baggage == NULL)
+ data->baggage = otc_text_map_new(NULL, FLT_OT_MAXBAGGAGES);
+
+ if (data->baggage == NULL) {
+ FLT_OT_ERR("out of memory");
+
+ retval = FLT_OT_RET_ERROR;
+ }
+ else if (otc_text_map_add(data->baggage, sample->key, 0, value.value.string_value, 0, 0) == -1) {
+ FLT_OT_ERR("out of memory");
+
+ retval = FLT_OT_RET_ERROR;
+ }
+ else
+ FLT_OT_DBG(3, "baggage[%zu]: '%s' -> '%s'", data->baggage->count - 1, data->baggage->key[data->baggage->count - 1], data->baggage->value[data->baggage->count - 1]);
+ }
+
+ FLT_OT_RETURN(retval);
+}
+
+/*
+ * Local variables:
+ * c-indent-level: 8
+ * c-basic-offset: 8
+ * End:
+ *
+ * vi: noexpandtab shiftwidth=8 tabstop=8
+ */