diff options
Diffstat (limited to 'src/fluent-bit/plugins/in_health')
-rw-r--r-- | src/fluent-bit/plugins/in_health/CMakeLists.txt | 4 | ||||
-rw-r--r-- | src/fluent-bit/plugins/in_health/health.c | 293 |
2 files changed, 297 insertions, 0 deletions
diff --git a/src/fluent-bit/plugins/in_health/CMakeLists.txt b/src/fluent-bit/plugins/in_health/CMakeLists.txt new file mode 100644 index 000000000..afb509ece --- /dev/null +++ b/src/fluent-bit/plugins/in_health/CMakeLists.txt @@ -0,0 +1,4 @@ +set(src + health.c) + +FLB_PLUGIN(in_health "${src}" "") diff --git a/src/fluent-bit/plugins/in_health/health.c b/src/fluent-bit/plugins/in_health/health.c new file mode 100644 index 000000000..72f59e51c --- /dev/null +++ b/src/fluent-bit/plugins/in_health/health.c @@ -0,0 +1,293 @@ +/* -*- 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_info.h> +#include <fluent-bit/flb_input.h> +#include <fluent-bit/flb_input_plugin.h> +#include <fluent-bit/flb_io.h> +#include <fluent-bit/flb_config.h> +#include <fluent-bit/flb_upstream.h> +#include <fluent-bit/flb_pack.h> +#include <fluent-bit/flb_log_event_encoder.h> + +#include <stdio.h> +#include <stdlib.h> +#include <math.h> + +#define DEFAULT_INTERVAL_SEC "1" +#define DEFAULT_INTERVAL_NSEC "0" + +/* Input configuration & context */ +struct flb_in_health_config { + /* Alert mode */ + int alert; + + /* Append Hostname */ + int add_host; + int len_host; + char* hostname; + + /* Append Port Number */ + int add_port; + int port; + + /* Time interval check */ + int interval_sec; + int interval_nsec; + + /* Networking */ + struct flb_upstream *u; + + struct flb_log_event_encoder log_encoder; + + /* Plugin instance */ + struct flb_input_instance *ins; +}; + +/* Collection aims to try to connect to the specified TCP server */ +static int in_health_collect(struct flb_input_instance *ins, + struct flb_config *config, void *in_context) +{ + uint8_t alive; + struct flb_in_health_config *ctx = in_context; + struct flb_connection *u_conn; + int ret; + + u_conn = flb_upstream_conn_get(ctx->u); + if (!u_conn) { + alive = FLB_FALSE; + } + else { + alive = FLB_TRUE; + flb_upstream_conn_release(u_conn); + } + + if (alive == FLB_TRUE && ctx->alert == FLB_TRUE) { + FLB_INPUT_RETURN(0); + } + + ret = flb_log_event_encoder_begin_record(&ctx->log_encoder); + + if (ret == FLB_EVENT_ENCODER_SUCCESS) { + ret = flb_log_event_encoder_set_current_timestamp( + &ctx->log_encoder); + } + + /* Status */ + if (ret == FLB_EVENT_ENCODER_SUCCESS) { + ret = flb_log_event_encoder_append_body_values( + &ctx->log_encoder, + FLB_LOG_EVENT_CSTRING_VALUE("alive"), + FLB_LOG_EVENT_BOOLEAN_VALUE(alive)); + } + + if (ctx->add_host) { + /* append hostname */ + if (ret == FLB_EVENT_ENCODER_SUCCESS) { + ret = flb_log_event_encoder_append_body_values( + &ctx->log_encoder, + FLB_LOG_EVENT_CSTRING_VALUE("hostname"), + FLB_LOG_EVENT_CSTRING_VALUE(ctx->hostname)); + } + } + + if (ctx->add_port) { + /* append port number */ + if (ret == FLB_EVENT_ENCODER_SUCCESS) { + ret = flb_log_event_encoder_append_body_values( + &ctx->log_encoder, + FLB_LOG_EVENT_CSTRING_VALUE("port"), + FLB_LOG_EVENT_INT32_VALUE(ctx->port)); + } + } + + if (ret == FLB_EVENT_ENCODER_SUCCESS) { + ret = flb_log_event_encoder_commit_record(&ctx->log_encoder); + } + + if (ret == FLB_EVENT_ENCODER_SUCCESS) { + flb_input_log_append(ins, NULL, 0, + ctx->log_encoder.output_buffer, + ctx->log_encoder.output_length); + + ret = 0; + } + else { + flb_plg_error(ins, "Error encoding record : %d", ret); + + ret = -1; + } + + flb_log_event_encoder_reset(&ctx->log_encoder); + + FLB_INPUT_RETURN(ret); +} + +static int in_health_init(struct flb_input_instance *in, + struct flb_config *config, void *data) +{ + int ret; + int upstream_flags; + struct flb_in_health_config *ctx; + (void) data; + + if (in->host.name == NULL) { + flb_plg_error(in, "no input 'Host' provided"); + return -1; + } + + /* Allocate space for the configuration */ + ctx = flb_calloc(1, sizeof(struct flb_in_health_config)); + if (!ctx) { + flb_errno(); + return -1; + } + ctx->alert = FLB_FALSE; + ctx->add_host = FLB_FALSE; + ctx->len_host = 0; + ctx->hostname = NULL; + ctx->add_port = FLB_FALSE; + ctx->port = -1; + ctx->ins = in; + + + /* Load the config map */ + ret = flb_input_config_map_set(in, (void *)ctx); + if (ret == -1) { + flb_free(ctx); + flb_plg_error(in, "unable to load configuration"); + return -1; + } + + upstream_flags = FLB_IO_TCP; + + if (in->use_tls) { + upstream_flags |= FLB_IO_TLS; + } + + ctx->u = flb_upstream_create(config, in->host.name, in->host.port, + upstream_flags, in->tls); + + if (!ctx->u) { + flb_plg_error(ctx->ins, "could not initialize upstream"); + flb_free(ctx); + return -1; + } + + if (ctx->interval_sec <= 0 && ctx->interval_nsec <= 0) { + /* Illegal settings. Override them. */ + ctx->interval_sec = atoi(DEFAULT_INTERVAL_SEC); + ctx->interval_nsec = atoi(DEFAULT_INTERVAL_NSEC); + } + + if (ctx->add_host) { + ctx->len_host = strlen(in->host.name); + ctx->hostname = flb_strdup(in->host.name); + } + + if (ctx->add_port) { + ctx->port = in->host.port; + } + + /* Set the context */ + flb_input_set_context(in, ctx); + + /* Set our collector based on time */ + ret = flb_input_set_collector_time(in, + in_health_collect, + ctx->interval_sec, + ctx->interval_nsec, + config); + if (ret == -1) { + flb_plg_error(ctx->ins, "could not set collector for Health input plugin"); + flb_free(ctx); + return -1; + } + + ret = flb_log_event_encoder_init(&ctx->log_encoder, + FLB_LOG_EVENT_FORMAT_DEFAULT); + + if (ret != FLB_EVENT_ENCODER_SUCCESS) { + flb_plg_error(in, "error initializing event encoder : %d", ret); + + flb_free(ctx); + + return -1; + } + + return 0; +} + +static int in_health_exit(void *data, struct flb_config *config) +{ + (void) *config; + struct flb_in_health_config *ctx = data; + + flb_log_event_encoder_destroy(&ctx->log_encoder); + + /* Remove msgpack buffer and destroy context */ + flb_upstream_destroy(ctx->u); + flb_free(ctx->hostname); + flb_free(ctx); + + return 0; +} + +static struct flb_config_map config_map[] = { + { + FLB_CONFIG_MAP_BOOL, "alert", "false", + 0, FLB_TRUE, offsetof(struct flb_in_health_config, alert), + "Only generate records when the port is down" + }, + { + FLB_CONFIG_MAP_BOOL, "add_host", "false", + 0, FLB_TRUE, offsetof(struct flb_in_health_config, add_host), + "Append hostname to each record" + }, + { + FLB_CONFIG_MAP_BOOL, "add_port", "false", + 0, FLB_TRUE, offsetof(struct flb_in_health_config, add_port), + "Append port to each record" + }, + { + FLB_CONFIG_MAP_INT, "interval_sec", DEFAULT_INTERVAL_SEC, + 0, FLB_TRUE, offsetof(struct flb_in_health_config, interval_sec), + "Set the collector interval" + }, + { + FLB_CONFIG_MAP_INT, "interval_nsec", DEFAULT_INTERVAL_NSEC, + 0, FLB_TRUE, offsetof(struct flb_in_health_config, interval_nsec), + "Set the collector interval (nanoseconds)" + }, + /* EOF */ + {0} +}; + +/* Plugin reference */ +struct flb_input_plugin in_health_plugin = { + .name = "health", + .description = "Check TCP server health", + .cb_init = in_health_init, + .cb_pre_run = NULL, + .cb_collect = in_health_collect, + .cb_flush_buf = NULL, + .cb_exit = in_health_exit, + .config_map = config_map, + .flags = FLB_INPUT_NET|FLB_INPUT_CORO +}; |