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flb_lib.c
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flb_lib.c
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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Fluent Bit Demo
* ===============
* Copyright (C) 2015-2017 Treasure Data Inc.
*
* 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
*
* https://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 <signal.h>
#include <stdarg.h>
#include <monkey/mk_core.h>
#include <fluent-bit/flb_lib.h>
#include <fluent-bit/flb_mem.h>
#include <fluent-bit/flb_pipe.h>
#include <fluent-bit/flb_engine.h>
#include <fluent-bit/flb_input.h>
#include <fluent-bit/flb_output.h>
#include <fluent-bit/flb_filter.h>
#include <fluent-bit/flb_utils.h>
#ifdef FLB_HAVE_MTRACE
#include <mcheck.h>
#endif
extern struct flb_input_plugin in_lib_plugin;
static inline struct flb_input_instance *in_instance_get(flb_ctx_t *ctx,
int ffd)
{
struct mk_list *head;
struct flb_input_instance *i_ins;
mk_list_foreach(head, &ctx->config->inputs) {
i_ins = mk_list_entry(head, struct flb_input_instance, _head);
if (i_ins->id == ffd) {
return i_ins;
}
}
return NULL;
}
static inline struct flb_output_instance *out_instance_get(flb_ctx_t *ctx,
int ffd)
{
struct mk_list *head;
struct flb_output_instance *o_ins;
mk_list_foreach(head, &ctx->config->outputs) {
o_ins = mk_list_entry(head, struct flb_output_instance, _head);
/*
* A small different between input/output instances. The output
* instances already have an unique mask_id used for routing, so we
* use it as an identificator for the API.
*/
if (o_ins->mask_id == ffd) {
return o_ins;
}
}
return NULL;
}
static inline struct flb_filter_instance *filter_instance_get(flb_ctx_t *ctx,
int ffd)
{
struct mk_list *head;
struct flb_filter_instance *f_ins;
mk_list_foreach(head, &ctx->config->filters) {
f_ins = mk_list_entry(head, struct flb_filter_instance, _head);
if (f_ins->id == ffd) {
return f_ins;
}
}
return NULL;
}
flb_ctx_t *flb_create()
{
int ret;
flb_ctx_t *ctx;
struct flb_config *config;
struct flb_log *log;
#ifdef FLB_HAVE_MTRACE
/* Start tracing malloc and free */
mtrace();
#endif
ctx = flb_calloc(1, sizeof(flb_ctx_t));
if (!ctx) {
perror("malloc");
return NULL;
}
config = flb_config_init();
if (!config) {
flb_free(ctx);
return NULL;
}
ctx->config = config;
/* Initialize logger */
log = flb_log_init(config, FLB_LOG_STDERR, FLB_LOG_INFO, NULL);
if (!log) {
flb_free(ctx);
return NULL;
}
/* Initialize our pipe to send data to our worker */
ret = flb_pipe_create(config->ch_data);
if (ret == -1) {
perror("pipe");
flb_free(ctx);
return NULL;
}
/* Create the event loop to receive notifications */
ctx->event_loop = mk_event_loop_create(256);
if (!ctx->event_loop) {
flb_free(ctx);
return NULL;
}
config->ch_evl = ctx->event_loop;
/* Prepare the notification channels */
ctx->event_channel = flb_calloc(1, sizeof(struct mk_event));
ret = mk_event_channel_create(config->ch_evl,
&config->ch_notif[0],
&config->ch_notif[1],
ctx->event_channel);
if (ret != 0) {
flb_error("[lib] could not create notification channels");
flb_destroy(ctx);
return NULL;
}
return ctx;
}
/* Release resources associated to the library context */
void flb_destroy(flb_ctx_t *ctx)
{
if (ctx->event_channel) {
mk_event_del(ctx->event_loop, ctx->event_channel);
flb_free(ctx->event_channel);
}
/* Remove resources from the event loop */
mk_event_loop_destroy(ctx->event_loop);
flb_free(ctx);
#ifdef FLB_HAVE_MTRACE
/* Stop tracing malloc and free */
muntrace();
#endif
}
/* Defines a new input instance */
int flb_input(flb_ctx_t *ctx, char *input, void *data)
{
struct flb_input_instance *i_ins;
i_ins = flb_input_new(ctx->config, input, data);
if (!i_ins) {
return -1;
}
return i_ins->id;
}
/* Defines a new output instance */
int flb_output(flb_ctx_t *ctx, char *output, void *data)
{
struct flb_output_instance *o_ins;
o_ins = flb_output_new(ctx->config, output, data);
if (!o_ins) {
return -1;
}
return o_ins->mask_id;
}
/* Defines a new filter instance */
int flb_filter(flb_ctx_t *ctx, char *filter, void *data)
{
struct flb_filter_instance *f_ins;
f_ins = flb_filter_new(ctx->config, filter, data);
if (!f_ins) {
return -1;
}
return f_ins->id;
}
/* Set an input interface property */
int flb_input_set(flb_ctx_t *ctx, int ffd, ...)
{
int ret;
char *key;
char *value;
va_list va;
struct flb_input_instance *i_ins;
i_ins = in_instance_get(ctx, ffd);
if (!i_ins) {
return -1;
}
va_start(va, ffd);
while ((key = va_arg(va, char *))) {
value = va_arg(va, char *);
if (!value) {
/* Wrong parameter */
return -1;
}
ret = flb_input_set_property(i_ins, key, value);
if (ret != 0) {
va_end(va);
return -1;
}
}
va_end(va);
return 0;
}
/* Set an output interface property */
int flb_output_set(flb_ctx_t *ctx, int ffd, ...)
{
int ret;
char *key;
char *value;
va_list va;
struct flb_output_instance *o_ins;
o_ins = out_instance_get(ctx, ffd);
if (!o_ins) {
return -1;
}
va_start(va, ffd);
while ((key = va_arg(va, char *))) {
value = va_arg(va, char *);
if (!value) {
/* Wrong parameter */
return -1;
}
ret = flb_output_set_property(o_ins, key, value);
if (ret != 0) {
va_end(va);
return -1;
}
}
va_end(va);
return 0;
}
/* Set an filter interface property */
int flb_filter_set(flb_ctx_t *ctx, int ffd, ...)
{
int ret;
char *key;
char *value;
va_list va;
struct flb_filter_instance *f_ins;
f_ins = filter_instance_get(ctx, ffd);
if (!f_ins) {
return -1;
}
va_start(va, ffd);
while ((key = va_arg(va, char *))) {
value = va_arg(va, char *);
if (!value) {
/* Wrong parameter */
return -1;
}
ret = flb_filter_set_property(f_ins, key, value);
if (ret != 0) {
va_end(va);
return -1;
}
}
va_end(va);
return 0;
}
/* Set a service property */
int flb_service_set(flb_ctx_t *ctx, ...)
{
int ret;
char *key;
char *value;
va_list va;
va_start(va, ctx);
while ((key = va_arg(va, char *))) {
value = va_arg(va, char *);
if (!value) {
/* Wrong parameter */
return -1;
}
ret = flb_config_set_property(ctx->config, key, value);
if (ret != 0) {
va_end(va);
return -1;
}
}
va_end(va);
return 0;
}
/* Load a configuration file that may be used by the input or output plugin */
int flb_lib_config_file(struct flb_lib_ctx *ctx, char *path)
{
if (access(path, R_OK) != 0) {
perror("access");
return -1;
}
ctx->config->file = mk_rconf_open(path);
if (!ctx->config->file) {
fprintf(stderr, "Error reading configuration file: %s\n", path);
return -1;
}
return 0;
}
/* Push some data into the Engine */
int flb_lib_push(flb_ctx_t *ctx, int ffd, void *data, size_t len)
{
int ret;
struct flb_input_instance *i_ins;
i_ins = in_instance_get(ctx, ffd);
if (!i_ins) {
return -1;
}
ret = flb_pipe_w(i_ins->channel[1], data, len);
if (ret == -1) {
flb_errno();
return -1;
}
return ret;
}
static void flb_lib_worker(void *data)
{
struct flb_config *config = data;
flb_log_init(config, FLB_LOG_STDERR, FLB_LOG_INFO, NULL);
flb_engine_start(config);
}
/* Start the engine */
int flb_start(flb_ctx_t *ctx)
{
int fd;
int bytes;
int ret;
uint64_t val;
pthread_t tid;
struct mk_event *event;
struct flb_config *config;
config = ctx->config;
ret = mk_utils_worker_spawn(flb_lib_worker, config, &tid);
if (ret == -1) {
return -1;
}
config->worker = tid;
/* Wait for the started signal so we can return to the caller */
mk_event_wait(config->ch_evl);
mk_event_foreach(event, config->ch_evl) {
fd = event->fd;
bytes = read(fd, &val, sizeof(uint64_t));
if (bytes <= 0) {
return -1;
}
if (val == FLB_ENGINE_STARTED) {
flb_debug("[lib] backend started");
break;
}
}
return 0;
}
/* Stop the engine */
int flb_stop(flb_ctx_t *ctx)
{
int ret;
uint64_t val;
if (ctx->config->file) {
mk_rconf_free(ctx->config->file);
}
flb_debug("[lib] sending STOP signal to the engine");
val = FLB_ENGINE_EV_STOP;
flb_pipe_w(ctx->config->ch_manager[1], &val, sizeof(uint64_t));
ret = pthread_join(ctx->config->worker, NULL);
flb_debug("[lib] Fluent Bit engine stopped");
return ret;
}