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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) 2015-2016 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 <unistd.h>
#include <stdarg.h>
#include <fluent-bit/flb_lib.h>
#include <fluent-bit/flb_engine.h>
#include <fluent-bit/flb_input.h>
#include <fluent-bit/flb_output.h>
#include <fluent-bit/flb_utils.h>
#ifdef FLB_HAVE_MTRACE
#include <mcheck.h>
#endif
extern struct flb_input_plugin in_lib_plugin;
flb_ctx_t *flb_create()
{
int ret;
flb_ctx_t *ctx;
struct flb_config *config;
#ifdef FLB_HAVE_MTRACE
/* Start tracing malloc and free */
mtrace();
#endif
ctx = calloc(1, sizeof(flb_ctx_t));
if (!ctx) {
perror("malloc");
return NULL;
}
config = flb_config_init();
if (!config) {
free(ctx);
return NULL;
}
ctx->config = config;
/* Initialize logger */
flb_log_init(FLB_LOG_STDERR, FLB_LOG_INFO, NULL);
/* Initialize our pipe to send data to our worker */
ret = pipe(config->ch_data);
if (ret == -1) {
perror("pipe");
free(ctx);
return NULL;
}
/* Create the event loop to receive notifications */
ctx->event_loop = mk_event_loop_create(256);
if (!ctx->event_loop) {
free(ctx);
return NULL;
}
config->ch_evl = ctx->event_loop;
/* Prepare the notification channels */
ctx->event_channel = 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);
free(ctx->event_channel);
}
/* Remove resources from the event loop */
mk_event_loop_destroy(ctx->event_loop);
free(ctx);
#ifdef FLB_HAVE_MTRACE
/* Stop tracing malloc and free */
muntrace();
#endif
}
/* Defines a new input instance */
flb_input_t *flb_input(flb_ctx_t *ctx, char *input, void *data)
{
return (flb_input_t *) flb_input_new(ctx->config, input, data);
}
/* Defines a new output instance */
flb_output_t *flb_output(flb_ctx_t *ctx, char *output, void *data)
{
return (flb_output_t *) flb_output_new(ctx->config, output, data);
}
/* Set an input interface property */
int flb_input_set(flb_input_t *input, ...)
{
int ret;
char *key;
char *value;
va_list va;
va_start(va, input);
while ((key = va_arg(va, char *))) {
value = va_arg(va, char *);
if (!value) {
/* Wrong parameter */
return -1;
}
ret = flb_input_set_property(input, key, value);
if (ret != 0) {
va_end(va);
return -1;
}
}
va_end(va);
return 0;
}
/* Set an input interface property */
int flb_output_set(flb_output_t *output, ...)
{
int ret;
char *key;
char *value;
va_list va;
va_start(va, output);
while ((key = va_arg(va, char *))) {
value = va_arg(va, char *);
if (!value) {
/* Wrong parameter */
return -1;
}
ret = flb_output_set_property(output, 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_input_t *input, void *data, size_t len)
{
int ret;
ret = write(input->channel[1], data, len);
if (ret == -1) {
perror("write");
}
return ret;
}
static void flb_lib_worker(void *data)
{
struct flb_config *config = data;
flb_log_init(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;
write(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;
}