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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.
*/
/*
* This interface is a wrapper of the 'lwrb' ring buffer implementation:
*
* - https://github.com/MaJerle/lwrb
*/
#include <fluent-bit/flb_info.h>
#include <fluent-bit/flb_mem.h>
#include <fluent-bit/flb_log.h>
#include <fluent-bit/flb_pipe.h>
#include <fluent-bit/flb_ring_buffer.h>
#include <fluent-bit/flb_engine_macros.h>
#include <monkey/mk_core.h>
#include <math.h>
/* lwrb header */
#include <lwrb/lwrb.h>
static void flb_ring_buffer_remove_event_loop(struct flb_ring_buffer *rb);
struct flb_ring_buffer *flb_ring_buffer_create(uint64_t size)
{
lwrb_t *lwrb;
void * data_buf;
size_t data_size;
struct flb_ring_buffer *rb;
rb = flb_calloc(1, sizeof(struct flb_ring_buffer));
if (!rb) {
flb_errno();
return NULL;
}
rb->data_size = size;
/* lwrb context */
lwrb = flb_malloc(sizeof(lwrb_t));
if (!lwrb) {
flb_errno();
flb_free(rb);
return NULL;
}
rb->ctx = lwrb;
/* data buffer for backend library */
data_size = 1 + (sizeof(uint8_t) * size);
data_buf = flb_calloc(1, data_size);
if (!data_buf) {
flb_errno();
flb_free(rb);
flb_free(lwrb);
return NULL;
}
rb->data_buf = data_buf;
/* initialize lwrb */
lwrb_init(rb->ctx, data_buf, data_size);
return rb;
}
void flb_ring_buffer_destroy(struct flb_ring_buffer *rb)
{
flb_ring_buffer_remove_event_loop(rb);
if (rb->data_buf) {
flb_free(rb->data_buf);
}
if (rb->ctx) {
flb_free(rb->ctx);
}
flb_free(rb);
}
int flb_ring_buffer_add_event_loop(struct flb_ring_buffer *rb, void *evl, uint8_t window_size)
{
int result;
if (window_size == 0) {
return -1;
}
else if (window_size > 100) {
window_size = 100;
}
rb->data_window = (uint64_t) floor((rb->data_size * window_size) / 100);
result = flb_pipe_create(rb->signal_channels);
if (result) {
return -2;
}
flb_pipe_set_nonblocking(rb->signal_channels[0]);
flb_pipe_set_nonblocking(rb->signal_channels[1]);
rb->signal_event = (void *) flb_calloc(1, sizeof(struct mk_event));
if (rb->signal_event == NULL) {
flb_pipe_destroy(rb->signal_channels);
return -2;
}
MK_EVENT_ZERO(rb->signal_event);
result = mk_event_add(evl,
rb->signal_channels[0],
FLB_ENGINE_EV_THREAD_INPUT,
MK_EVENT_READ,
rb->signal_event);
if (result) {
flb_pipe_destroy(rb->signal_channels);
flb_free(rb->signal_event);
rb->signal_event = NULL;
return -3;
}
rb->event_loop = evl;
return 0;
}
static void flb_ring_buffer_remove_event_loop(struct flb_ring_buffer *rb)
{
if (rb->event_loop != NULL) {
mk_event_del(rb->event_loop, rb->signal_event);
flb_pipe_destroy(rb->signal_channels);
flb_free(rb->signal_event);
rb->signal_event = NULL;
rb->data_window = 0;
rb->event_loop = NULL;
}
}
int flb_ring_buffer_write(struct flb_ring_buffer *rb, void *ptr, size_t size)
{
size_t used_size;
size_t ret;
size_t av;
/* make sure there is enough space available */
av = lwrb_get_free(rb->ctx);
if (av < size) {
return -1;
}
/* write the content */
ret = lwrb_write(rb->ctx, ptr, size);
if (ret == 0) {
return -1;
}
if (!rb->flush_pending) {
used_size = rb->data_size - (av - size);
if (used_size >= rb->data_window) {
rb->flush_pending = FLB_TRUE;
flb_pipe_write_all(rb->signal_channels[1], ".", 1);
}
}
return 0;
}
int flb_ring_buffer_read(struct flb_ring_buffer *rb, void *ptr, size_t size)
{
size_t ret;
ret = lwrb_read(rb->ctx, ptr, size);
if (ret == 0) {
return -1;
}
return 0;
}
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