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Diffstat (limited to 'fluent-bit/plugins/in_docker_events/docker_events.c')
-rw-r--r--fluent-bit/plugins/in_docker_events/docker_events.c476
1 files changed, 476 insertions, 0 deletions
diff --git a/fluent-bit/plugins/in_docker_events/docker_events.c b/fluent-bit/plugins/in_docker_events/docker_events.c
new file mode 100644
index 00000000..7534eb1d
--- /dev/null
+++ b/fluent-bit/plugins/in_docker_events/docker_events.c
@@ -0,0 +1,476 @@
+/* -*- 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_input_plugin.h>
+#include <fluent-bit/flb_network.h>
+#include <fluent-bit/flb_pack.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#include "docker_events.h"
+#include "docker_events_config.h"
+
+
+/**
+ * Creates the connection to docker's unix socket and sends the
+ * HTTP GET /events
+ *
+ * @param ctx Pointer to flb_in_de_config
+ *
+ * @return int 0 on success, -1 on failure
+ */
+static int de_unix_create(struct flb_in_de_config *ctx)
+{
+ ssize_t bytes;
+ unsigned long len;
+ size_t address_length;
+ struct sockaddr_un address;
+ char request[512];
+
+ ctx->fd = flb_net_socket_create(AF_UNIX, FLB_FALSE);
+ if (ctx->fd == -1) {
+ return -1;
+ }
+
+ /* Prepare the unix socket path */
+ len = strlen(ctx->unix_path);
+ address.sun_family = AF_UNIX;
+ sprintf(address.sun_path, "%s", ctx->unix_path);
+ address_length = sizeof(address.sun_family) + len + 1;
+ if (connect(ctx->fd, (struct sockaddr *)&address, address_length) == -1) {
+ flb_errno();
+ close(ctx->fd);
+ return -1;
+ }
+
+ strcpy(request, "GET /events HTTP/1.0\r\n\r\n");
+ flb_plg_trace(ctx->ins, "writing to socket %s", request);
+ write(ctx->fd, request, strlen(request));
+
+ /* Read the initial http response */
+ bytes = read(ctx->fd, ctx->buf, ctx->buf_size - 1);
+ if (bytes == -1) {
+ flb_errno();
+ }
+ flb_plg_debug(ctx->ins, "read %zu bytes from socket", bytes);
+
+ return 0;
+}
+
+static int in_de_collect(struct flb_input_instance *ins,
+ struct flb_config *config, void *in_context);
+
+static int reconnect_docker_sock(struct flb_input_instance *ins,
+ struct flb_config *config,
+ struct flb_in_de_config *ctx)
+{
+ int ret;
+
+ /* remove old socket collector */
+ if (ctx->coll_id >= 0) {
+ ret = flb_input_collector_delete(ctx->coll_id, ins);
+ if (ret < 0) {
+ flb_plg_error(ctx->ins, "failed to pause event");
+ return -1;
+ }
+ ctx->coll_id = -1;
+ }
+ if (ctx->fd > 0) {
+ flb_plg_debug(ctx->ins, "close socket fd=%d", ctx->fd);
+ close(ctx->fd);
+ ctx->fd = -1;
+ }
+
+ /* create socket again */
+ if (de_unix_create(ctx) < 0) {
+ flb_plg_error(ctx->ins, "failed to re-initialize socket");
+ if (ctx->fd > 0) {
+ flb_plg_debug(ctx->ins, "close socket fd=%d", ctx->fd);
+ close(ctx->fd);
+ ctx->fd = -1;
+ }
+ return -1;
+ }
+ /* set event */
+ ctx->coll_id = flb_input_set_collector_event(ins,
+ in_de_collect,
+ ctx->fd, config);
+ if (ctx->coll_id < 0) {
+ flb_plg_error(ctx->ins,
+ "could not set collector for IN_DOCKER_EVENTS plugin");
+ close(ctx->fd);
+ ctx->fd = -1;
+ return -1;
+ }
+ ret = flb_input_collector_start(ctx->coll_id, ins);
+ if (ret < 0) {
+ flb_plg_error(ctx->ins,
+ "could not start collector for IN_DOCKER_EVENTS plugin");
+ flb_input_collector_delete(ctx->coll_id, ins);
+ close(ctx->fd);
+ ctx->coll_id = -1;
+ ctx->fd = -1;
+ return -1;
+ }
+
+ flb_plg_info(ctx->ins, "Reconnect successful");
+ return 0;
+}
+
+static int cb_reconnect(struct flb_input_instance *ins,
+ struct flb_config *config,
+ void *in_context)
+{
+ struct flb_in_de_config *ctx = in_context;
+ int ret;
+
+ flb_plg_info(ctx->ins, "Retry(%d/%d)",
+ ctx->current_retries, ctx->reconnect_retry_limits);
+ ret = reconnect_docker_sock(ins, config, ctx);
+ if (ret < 0) {
+ /* Failed to reconnect */
+ ctx->current_retries++;
+ if (ctx->current_retries > ctx->reconnect_retry_limits) {
+ /* give up */
+ flb_plg_error(ctx->ins, "Failed to retry. Giving up...");
+ goto cb_reconnect_end;
+ }
+ flb_plg_info(ctx->ins, "Failed. Waiting for next retry..");
+ return 0;
+ }
+
+ cb_reconnect_end:
+ if(flb_input_collector_delete(ctx->retry_coll_id, ins) < 0) {
+ flb_plg_error(ctx->ins, "failed to delete timer event");
+ }
+ ctx->current_retries = 0;
+ ctx->retry_coll_id = -1;
+ return ret;
+}
+
+static int create_reconnect_event(struct flb_input_instance *ins,
+ struct flb_config *config,
+ struct flb_in_de_config *ctx)
+{
+ int ret;
+
+ if (ctx->retry_coll_id >= 0) {
+ flb_plg_debug(ctx->ins, "already retring ?");
+ return 0;
+ }
+
+ /* try before creating event to stop incoming event */
+ ret = reconnect_docker_sock(ins, config, ctx);
+ if (ret == 0) {
+ return 0;
+ }
+
+ ctx->current_retries = 1;
+ ctx->retry_coll_id = flb_input_set_collector_time(ins,
+ cb_reconnect,
+ ctx->reconnect_retry_interval,
+ 0,
+ config);
+ if (ctx->retry_coll_id < 0) {
+ flb_plg_error(ctx->ins, "failed to create timer event");
+ return -1;
+ }
+ ret = flb_input_collector_start(ctx->retry_coll_id, ins);
+ if (ret < 0) {
+ flb_plg_error(ctx->ins, "failed to start timer event");
+ flb_input_collector_delete(ctx->retry_coll_id, ins);
+ ctx->retry_coll_id = -1;
+ return -1;
+ }
+ flb_plg_info(ctx->ins, "create reconnect event. interval=%d second",
+ ctx->reconnect_retry_interval);
+
+ return 0;
+}
+
+static int is_recoverable_error(int error)
+{
+ /* ENOTTY:
+ It reports on Docker in Docker mode.
+ https://github.com/fluent/fluent-bit/issues/3439#issuecomment-831424674
+ */
+ if (error == ENOTTY || error == EBADF) {
+ return FLB_TRUE;
+ }
+ return FLB_FALSE;
+}
+
+
+/**
+ * Callback function to process events recieved on the unix
+ * socket.
+ *
+ * @param ins Pointer to flb_input_instance
+ * @param config Pointer to flb_config
+ * @param in_context void Pointer used to cast to
+ * flb_in_de_config
+ *
+ * @return int Always returns success
+ */
+static int in_de_collect(struct flb_input_instance *ins,
+ struct flb_config *config, void *in_context)
+{
+ int ret = 0;
+ int error;
+ size_t str_len = 0;
+ struct flb_in_de_config *ctx = in_context;
+
+ /* variables for parser */
+ int parser_ret = -1;
+ void *out_buf = NULL;
+ size_t out_size = 0;
+ struct flb_time out_time;
+
+ ret = read(ctx->fd, ctx->buf, ctx->buf_size - 1);
+
+ if (ret > 0) {
+ str_len = ret;
+ ctx->buf[str_len] = '\0';
+
+ ret = flb_log_event_encoder_begin_record(&ctx->log_encoder);
+
+ if (!ctx->parser) {
+ /* Initialize local msgpack buffer */
+ if (ret == FLB_EVENT_ENCODER_SUCCESS) {
+ ret = flb_log_event_encoder_set_current_timestamp(
+ &ctx->log_encoder);
+ }
+
+ if (ret == FLB_EVENT_ENCODER_SUCCESS) {
+ ret = flb_log_event_encoder_append_body_values(
+ &ctx->log_encoder,
+ FLB_LOG_EVENT_CSTRING_VALUE(ctx->key),
+ FLB_LOG_EVENT_STRING_VALUE(ctx->buf, str_len));
+ }
+
+ 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);
+
+ }
+ else {
+ flb_plg_error(ctx->ins, "Error encoding record : %d", ret);
+ }
+ }
+ else {
+ flb_time_get(&out_time);
+
+ parser_ret = flb_parser_do(ctx->parser, ctx->buf, str_len - 1,
+ &out_buf, &out_size, &out_time);
+ if (parser_ret >= 0) {
+ if (flb_time_to_nanosec(&out_time) == 0L) {
+ flb_time_get(&out_time);
+ }
+
+ if (ret == FLB_EVENT_ENCODER_SUCCESS) {
+ ret = flb_log_event_encoder_set_timestamp(
+ &ctx->log_encoder,
+ &out_time);
+ }
+
+ if (ret == FLB_EVENT_ENCODER_SUCCESS) {
+ ret = flb_log_event_encoder_set_body_from_raw_msgpack(
+ &ctx->log_encoder,
+ out_buf,
+ out_size);
+ }
+
+ 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);
+
+ }
+ else {
+ flb_plg_error(ctx->ins, "Error encoding record : %d", ret);
+ }
+
+
+ flb_free(out_buf);
+ }
+ else {
+ flb_plg_trace(ctx->ins, "tried to parse: %s", ctx->buf);
+ flb_plg_trace(ctx->ins, "buf_size %zu", ctx->buf_size);
+ flb_plg_error(ctx->ins, "parser returned an error: %d",
+ parser_ret);
+ }
+ }
+
+ flb_log_event_encoder_reset(&ctx->log_encoder);
+ }
+ else if (ret == 0) {
+ /* EOF */
+
+ /* docker service may be restarted */
+ flb_plg_info(ctx->ins, "EOF detected. Re-initialize");
+ if (ctx->reconnect_retry_limits > 0) {
+ ret = create_reconnect_event(ins, config, ctx);
+ if (ret < 0) {
+ return ret;
+ }
+ }
+ }
+ else {
+ error = errno;
+ flb_plg_error(ctx->ins, "read returned error: %d, %s", error,
+ strerror(error));
+ if (is_recoverable_error(error)) {
+ if (ctx->reconnect_retry_limits > 0) {
+ ret = create_reconnect_event(ins, config, ctx);
+ if (ret < 0) {
+ return ret;
+ }
+ }
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * Callback function to initialize docker events plugin
+ *
+ * @param ins Pointer to flb_input_instance
+ * @param config Pointer to flb_config
+ * @param data Unused
+ *
+ * @return int 0 on success, -1 on failure
+ */
+static int in_de_init(struct flb_input_instance *ins,
+ struct flb_config *config, void *data)
+{
+ struct flb_in_de_config *ctx = NULL;
+ (void) data;
+
+ /* Allocate space for the configuration */
+ ctx = de_config_init(ins, config);
+ if (!ctx) {
+ return -1;
+ }
+ ctx->ins = ins;
+ ctx->retry_coll_id = -1;
+ ctx->current_retries = 0;
+
+ /* Set the context */
+ flb_input_set_context(ins, ctx);
+
+ if (de_unix_create(ctx) != 0) {
+ flb_plg_error(ctx->ins, "could not listen on unix://%s",
+ ctx->unix_path);
+ de_config_destroy(ctx);
+ return -1;
+ }
+
+ ctx->coll_id = flb_input_set_collector_event(ins, in_de_collect,
+ ctx->fd, config);
+ if(ctx->coll_id < 0){
+ flb_plg_error(ctx->ins,
+ "could not set collector for IN_DOCKER_EVENTS plugin");
+ de_config_destroy(ctx);
+ return -1;
+ }
+
+ flb_plg_info(ctx->ins, "listening for events on %s", ctx->unix_path);
+ return 0;
+}
+
+/**
+ * Callback exit function to cleanup plugin
+ *
+ * @param data Pointer cast to flb_in_de_config
+ * @param config Unused
+ *
+ * @return int Always returns 0
+ */
+static int in_de_exit(void *data, struct flb_config *config)
+{
+ (void) config;
+ struct flb_in_de_config *ctx = data;
+
+ if (!ctx) {
+ return 0;
+ }
+
+ de_config_destroy(ctx);
+
+ return 0;
+}
+
+/* Configuration properties map */
+static struct flb_config_map config_map[] = {
+ {
+ FLB_CONFIG_MAP_STR, "unix_path", DEFAULT_UNIX_SOCKET_PATH,
+ 0, FLB_TRUE, offsetof(struct flb_in_de_config, unix_path),
+ "Define Docker unix socket path to read events"
+ },
+ {
+ FLB_CONFIG_MAP_SIZE, "buffer_size", "8k",
+ 0, FLB_TRUE, offsetof(struct flb_in_de_config, buf_size),
+ "Set buffer size to read events"
+ },
+ {
+ FLB_CONFIG_MAP_STR, "parser", NULL,
+ 0, FLB_FALSE, 0,
+ "Optional parser for records, if not set, records are packages under 'key'"
+ },
+ {
+ FLB_CONFIG_MAP_STR, "key", DEFAULT_FIELD_NAME,
+ 0, FLB_TRUE, offsetof(struct flb_in_de_config, key),
+ "Set the key name to store unparsed Docker events"
+ },
+ {
+ FLB_CONFIG_MAP_INT, "reconnect.retry_limits", "5",
+ 0, FLB_TRUE, offsetof(struct flb_in_de_config, reconnect_retry_limits),
+ "Maximum number to retry to connect docker socket"
+ },
+ {
+ FLB_CONFIG_MAP_INT, "reconnect.retry_interval", "1",
+ 0, FLB_TRUE, offsetof(struct flb_in_de_config, reconnect_retry_interval),
+ "Retry interval to connect docker socket"
+ },
+ /* EOF */
+ {0}
+};
+
+/* Plugin reference */
+struct flb_input_plugin in_docker_events_plugin = {
+ .name = "docker_events",
+ .description = "Docker events",
+ .cb_init = in_de_init,
+ .cb_pre_run = NULL,
+ .cb_collect = in_de_collect,
+ .cb_flush_buf = NULL,
+ .cb_exit = in_de_exit,
+ .config_map = config_map,
+ .flags = FLB_INPUT_NET
+};
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