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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_utils.h>
#include <fluent-bit/flb_sds.h>
#include <fluent-bit/flb_kv.h>
#include "stackdriver.h"
#include "stackdriver_resource_types.h"
static const struct resource_type resource_types[] = {
{
.id = RESOURCE_TYPE_K8S,
.resources = {"k8s_container", "k8s_node", "k8s_pod"},
.required_labels = {"cluster_name", "location"}
},
{
.id = RESOURCE_TYPE_GENERIC_NODE,
.resources = {"generic_node"},
.required_labels = {"location", "namespace", "node_id"}
},
{
.id = RESOURCE_TYPE_GENERIC_TASK,
.resources = {"generic_task"},
.required_labels = {"location", "namespace", "job", "task_id"}
}
};
static char **get_required_labels(int resource_type)
{
int i;
int len;
len = sizeof(resource_types) / sizeof(resource_types[0]);
for(i = 0; i < len; i++) {
if (resource_types[i].id == resource_type) {
return (char **) resource_types[i].required_labels;
}
}
return NULL;
}
/*
* set_resource_type():
* - Iterates through resource_types that are set up for validation and sets the
* resource_type if it matches one of them.
* - A resource may not be in the resource types list but still be accepted
* and processed (e.g. global) if it does not require / is not set up for validation.
*/
void set_resource_type(struct flb_stackdriver *ctx)
{
int i;
int j;
int len;
char *resource;
struct resource_type resource_type;
len = sizeof(resource_types) / sizeof(resource_types[0]);
for(i = 0; i < len; i++) {
resource_type = resource_types[i];
for(j = 0; j < MAX_RESOURCE_ENTRIES; j++) {
if (resource_type.resources[j] != NULL) {
resource = resource_type.resources[j];
if (flb_sds_cmp(ctx->resource, resource, strlen(resource)) == 0) {
ctx->resource_type = resource_type.id;
return;
}
}
}
}
}
/*
* resource_api_has_required_labels():
* - Determines if all required labels for the set resource type are present as
* keys on the resource labels key-value pairs.
*/
int resource_api_has_required_labels(struct flb_stackdriver *ctx)
{
struct mk_list *head;
struct flb_hash_table *ht;
struct flb_kv *label_kv;
char** required_labels;
int i;
int found;
void *tmp_buf;
size_t tmp_size;
if (mk_list_size(&ctx->resource_labels_kvs) == 0) {
return FLB_FALSE;
}
required_labels = get_required_labels(ctx->resource_type);
if (required_labels == NULL) {
flb_plg_warn(ctx->ins, "no validation applied to resource_labels "
"for set resource type");
return FLB_FALSE;
}
ht = flb_hash_table_create(FLB_HASH_TABLE_EVICT_NONE, MAX_REQUIRED_LABEL_ENTRIES, 0);
mk_list_foreach(head, &ctx->resource_labels_kvs) {
label_kv = mk_list_entry(head, struct flb_kv, _head);
for (i = 0; i < MAX_REQUIRED_LABEL_ENTRIES; i++) {
if (required_labels[i] != NULL && flb_sds_cmp(label_kv->key,
required_labels[i], strlen(required_labels[i])) == 0) {
flb_hash_table_add(ht, required_labels[i], strlen(required_labels[i]),
NULL, 0);
}
}
}
for (i = 0; i < MAX_REQUIRED_LABEL_ENTRIES; i++) {
if (required_labels[i] != NULL) {
found = flb_hash_table_get(ht, required_labels[i], strlen(required_labels[i]),
&tmp_buf, &tmp_size);
if (found == -1) {
flb_plg_warn(ctx->ins, "labels set in resource_labels will not be applied"
", as the required resource label [%s] is missing", required_labels[i]);
ctx->should_skip_resource_labels_api = FLB_TRUE;
flb_hash_table_destroy(ht);
return FLB_FALSE;
}
}
}
flb_hash_table_destroy(ht);
return FLB_TRUE;
}
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