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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Fluent Bit
* ==========
* Copyright (C) 2015-2022 The Fluent Bit Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <fluent-bit/flb_output_plugin.h>
#include <fluent-bit/flb_utils.h>
#include <fluent-bit/flb_pack.h>
#include <fluent-bit/flb_sds.h>
#include <fluent-bit/flb_kv.h>
#include "opentelemetry.h"
#include "opentelemetry_conf.h"
static int config_add_labels(struct flb_output_instance *ins,
struct opentelemetry_context *ctx)
{
struct mk_list *head;
struct flb_config_map_val *mv;
struct flb_slist_entry *k = NULL;
struct flb_slist_entry *v = NULL;
struct flb_kv *kv;
if (!ctx->add_labels || mk_list_size(ctx->add_labels) == 0) {
return 0;
}
/* iterate all 'add_label' definitions */
flb_config_map_foreach(head, mv, ctx->add_labels) {
if (mk_list_size(mv->val.list) != 2) {
flb_plg_error(ins, "'add_label' expects a key and a value, "
"e.g: 'add_label version 1.8.0'");
return -1;
}
k = mk_list_entry_first(mv->val.list, struct flb_slist_entry, _head);
v = mk_list_entry_last(mv->val.list, struct flb_slist_entry, _head);
kv = flb_kv_item_create(&ctx->kv_labels, k->str, v->str);
if (!kv) {
flb_plg_error(ins, "could not append label %s=%s\n", k->str, v->str);
return -1;
}
}
return 0;
}
/*
* Check if a Proxy have been set, if so the Upstream manager will use
* the Proxy end-point and then we let the HTTP client know about it, so
* it can adjust the HTTP requests.
*/
static void check_proxy(struct flb_output_instance *ins,
struct opentelemetry_context *ctx,
char *host, char *port,
char *protocol, char *uri){
const char *tmp = NULL;
int ret;
tmp = flb_output_get_property("proxy", ins);
if (tmp) {
ret = flb_utils_url_split(tmp, &protocol, &host, &port, &uri);
if (ret == -1) {
flb_plg_error(ctx->ins, "could not parse proxy parameter: '%s'", tmp);
flb_free(ctx);
}
ctx->proxy_host = host;
ctx->proxy_port = atoi(port);
ctx->proxy = tmp;
flb_free(protocol);
flb_free(port);
flb_free(uri);
uri = NULL;
}
else {
flb_output_net_default("127.0.0.1", 80, ins);
}
}
static char *sanitize_uri(char *uri){
char *new_uri;
int uri_len;
if (uri == NULL) {
uri = flb_strdup("/");
}
else if (uri[0] != '/') {
uri_len = strlen(uri);
new_uri = flb_calloc(uri_len + 2, sizeof(char));
if (new_uri != NULL) {
new_uri[0] = '/';
strncat(new_uri, uri, uri_len + 1);
}
uri = new_uri;
}
/* This function could return NULL if flb_calloc fails */
return uri;
}
struct opentelemetry_context *flb_opentelemetry_context_create(
struct flb_output_instance *ins, struct flb_config *config)
{
int ret;
int io_flags = 0;
char *protocol = NULL;
char *host = NULL;
char *port = NULL;
char *metrics_uri = NULL;
char *traces_uri = NULL;
char *logs_uri = NULL;
struct flb_upstream *upstream;
struct opentelemetry_context *ctx = NULL;
const char *tmp = NULL;
/* Allocate plugin context */
ctx = flb_calloc(1, sizeof(struct opentelemetry_context));
if (!ctx) {
flb_errno();
return NULL;
}
ctx->ins = ins;
mk_list_init(&ctx->kv_labels);
ret = flb_output_config_map_set(ins, (void *) ctx);
if (ret == -1) {
flb_free(ctx);
return NULL;
}
/* Parse 'add_label' */
ret = config_add_labels(ins, ctx);
if (ret == -1) {
return NULL;
}
check_proxy(ins, ctx, host, port, protocol, metrics_uri);
check_proxy(ins, ctx, host, port, protocol, logs_uri);
/* Check if SSL/TLS is enabled */
#ifdef FLB_HAVE_TLS
if (ins->use_tls == FLB_TRUE) {
io_flags = FLB_IO_TLS;
}
else {
io_flags = FLB_IO_TCP;
}
#else
io_flags = FLB_IO_TCP;
#endif
if (ins->host.ipv6 == FLB_TRUE) {
io_flags |= FLB_IO_IPV6;
}
if (ctx->proxy) {
flb_plg_trace(ctx->ins, "Upstream Proxy=%s:%i",
ctx->proxy_host, ctx->proxy_port);
upstream = flb_upstream_create(config,
ctx->proxy_host,
ctx->proxy_port,
io_flags, ins->tls);
}
else {
upstream = flb_upstream_create(config,
ins->host.name,
ins->host.port,
io_flags, ins->tls);
}
if (!upstream) {
flb_free(ctx);
return NULL;
}
logs_uri = sanitize_uri(ctx->logs_uri);
traces_uri = sanitize_uri(ctx->traces_uri);
metrics_uri = sanitize_uri(ctx->metrics_uri);
ctx->u = upstream;
ctx->host = ins->host.name;
ctx->port = ins->host.port;
if (logs_uri == NULL) {
flb_plg_trace(ctx->ins,
"Could not allocate memory for sanitized "
"log endpoint uri");
}
else {
ctx->logs_uri = logs_uri;
}
if (traces_uri == NULL) {
flb_plg_trace(ctx->ins,
"Could not allocate memory for sanitized "
"trace endpoint uri");
}
else {
ctx->traces_uri = traces_uri;
}
if (metrics_uri == NULL) {
flb_plg_trace(ctx->ins,
"Could not allocate memory for sanitized "
"metric endpoint uri");
}
else {
ctx->metrics_uri = metrics_uri;
}
/* Set instance flags into upstream */
flb_output_upstream_set(ctx->u, ins);
tmp = flb_output_get_property("compress", ins);
ctx->compress_gzip = FLB_FALSE;
if (tmp) {
if (strcasecmp(tmp, "gzip") == 0) {
ctx->compress_gzip = FLB_TRUE;
}
}
return ctx;
}
void flb_opentelemetry_context_destroy(
struct opentelemetry_context *ctx)
{
if (!ctx) {
return;
}
flb_kv_release(&ctx->kv_labels);
if (ctx->u) {
flb_upstream_destroy(ctx->u);
}
flb_free(ctx->proxy_host);
flb_free(ctx);
}
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