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go.c
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go.c
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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Fluent Bit
* ==========
* Copyright (C) 2015-2024 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_config.h>
#include <fluent-bit/flb_plugin_proxy.h>
#include <fluent-bit/flb_output.h>
#include "./go.h"
/*
* These functions needs to be moved to a better place, still in
* experimental mode.
*
* ------------------------start------------------------------------------------
*/
/*
* Go Plugin phases
* ================
* Copyright (C) 2015-2024 The Fluent Bit Authors
*
* 1. FLBPluginRegister(context)
* 2. Inside FLBPluginRegister, it needs to register it self using Fluent Bit API
* where it basically set:
*
* - name: shortname of the plugin.
* - description: plugin description.
* - type: input, output, filter, whatever.
* - proxy: type of proxy e.g. GOLANG
* - flags: optional flags, not used by Go plugins at the moment.
*
* this is done through Go Wrapper:
*
* output.FLBPluginRegister(ctx, name, description, type, flags);
*
* 3. Plugin Initialization
*/
/*------------------------EOF------------------------------------------------*/
int proxy_go_output_register(struct flb_plugin_proxy *proxy,
struct flb_plugin_proxy_def *def)
{
struct flbgo_output_plugin *plugin;
plugin = flb_malloc(sizeof(struct flbgo_output_plugin));
if (!plugin) {
return -1;
}
/*
* Lookup the entry point function:
*
* - FLBPluginInit
* - FLBPluginFlush
* - FLBPluginFlushCtx
* - FLBPluginExit
*
* note: registration callback FLBPluginRegister() is resolved by the
* parent proxy interface.
*/
plugin->cb_init = flb_plugin_proxy_symbol(proxy, "FLBPluginInit");
if (!plugin->cb_init) {
flb_error("[go proxy]: could not load FLBPluginInit symbol");
flb_free(plugin);
return -1;
}
plugin->cb_flush = flb_plugin_proxy_symbol(proxy, "FLBPluginFlush");
plugin->cb_flush_ctx = flb_plugin_proxy_symbol(proxy, "FLBPluginFlushCtx");
plugin->cb_exit = flb_plugin_proxy_symbol(proxy, "FLBPluginExit");
plugin->cb_exit_ctx = flb_plugin_proxy_symbol(proxy, "FLBPluginExitCtx");
plugin->name = flb_strdup(def->name);
/* This Go plugin context is an opaque data for the parent proxy */
proxy->data = plugin;
return 0;
}
int proxy_go_output_init(struct flb_plugin_proxy *proxy)
{
int ret;
struct flbgo_output_plugin *plugin = proxy->data;
/* set the API */
plugin->api = proxy->api;
plugin->o_ins = proxy->instance;
// In order to avoid having the whole instance as part of the ABI we
// copy the context pointer into the plugin.
plugin->context = ((struct flb_output_instance *)proxy->instance)->context;
ret = plugin->cb_init(plugin);
if (ret <= 0) {
flb_error("[go proxy]: plugin '%s' failed to initialize",
plugin->name);
return -1;
}
return ret;
}
int proxy_go_output_flush(struct flb_plugin_proxy_context *ctx,
const void *data, size_t size,
const char *tag, int tag_len)
{
int ret;
char *buf;
struct flbgo_output_plugin *plugin = ctx->proxy->data;
/* temporary buffer for the tag */
buf = flb_malloc(tag_len + 1);
if (!buf) {
flb_errno();
return -1;
}
memcpy(buf, tag, tag_len);
buf[tag_len] = '\0';
if (plugin->cb_flush_ctx) {
ret = plugin->cb_flush_ctx(ctx->remote_context, data, size, buf);
}
else {
ret = plugin->cb_flush(data, size, buf);
}
flb_free(buf);
return ret;
}
int proxy_go_output_destroy(struct flb_plugin_proxy_context *ctx)
{
int ret = 0;
struct flbgo_output_plugin *plugin;
plugin = (struct flbgo_output_plugin *) ctx->proxy->data;
flb_debug("[GO] running exit callback");
if (plugin->cb_exit_ctx) {
ret = plugin->cb_exit_ctx(ctx->remote_context);
}
else if (plugin->cb_exit) {
ret = plugin->cb_exit();
}
return ret;
}
void proxy_go_output_unregister(void *data) {
struct flbgo_output_plugin *plugin;
plugin = (struct flbgo_output_plugin *) data;
flb_free(plugin->name);
flb_free(plugin);
}
int proxy_go_input_register(struct flb_plugin_proxy *proxy,
struct flb_plugin_proxy_def *def)
{
struct flbgo_input_plugin *plugin;
plugin = flb_malloc(sizeof(struct flbgo_input_plugin));
if (!plugin) {
return -1;
}
/*
* Lookup the entry point function:
*
* - FLBPluginInit
* - FLBPluginInputCallback
* - FLBPluginExit
*
* note: registration callback FLBPluginRegister() is resolved by the
* parent proxy interface.
*/
plugin->cb_init = flb_plugin_proxy_symbol(proxy, "FLBPluginInit");
if (!plugin->cb_init) {
flb_error("[go proxy]: could not load FLBPluginInit symbol");
flb_free(plugin);
return -1;
}
plugin->cb_collect = flb_plugin_proxy_symbol(proxy, "FLBPluginInputCallback");
plugin->cb_cleanup = flb_plugin_proxy_symbol(proxy, "FLBPluginInputCleanupCallback");
plugin->cb_exit = flb_plugin_proxy_symbol(proxy, "FLBPluginExit");
plugin->name = flb_strdup(def->name);
/* This Go plugin context is an opaque data for the parent proxy */
proxy->data = plugin;
return 0;
}
int proxy_go_input_init(struct flb_plugin_proxy *proxy)
{
int ret;
struct flbgo_input_plugin *plugin = proxy->data;
/* set the API */
plugin->api = proxy->api;
plugin->i_ins = proxy->instance;
// In order to avoid having the whole instance as part of the ABI we
// copy the context pointer into the plugin.
plugin->context = ((struct flb_input_instance *)proxy->instance)->context;
ret = plugin->cb_init(plugin);
if (ret <= 0) {
flb_error("[go proxy]: plugin '%s' failed to initialize",
plugin->name);
flb_free(plugin);
return -1;
}
return ret;
}
int proxy_go_input_collect(struct flb_plugin_proxy *ctx,
void **collected_data, size_t *len)
{
int ret;
void *data = NULL;
struct flbgo_input_plugin *plugin = ctx->data;
ret = plugin->cb_collect(&data, len);
*collected_data = data;
return ret;
}
int proxy_go_input_cleanup(struct flb_plugin_proxy *ctx,
void *allocated_data)
{
int ret = 0;
struct flbgo_input_plugin *plugin = ctx->data;
if (plugin->cb_cleanup) {
ret = plugin->cb_cleanup(allocated_data);
}
else {
/* If cleanup callback is not registered, we need to cleanup
* allocated memory on fluent-bit side. */
if (allocated_data != NULL) {
free(allocated_data);
}
}
return ret;
}
int proxy_go_input_destroy(struct flb_plugin_input_proxy_context *ctx)
{
int ret = 0;
struct flbgo_input_plugin *plugin;
plugin = (struct flbgo_input_plugin *) ctx->proxy->data;
flb_debug("[GO] running exit callback");
if (plugin->cb_exit) {
ret = plugin->cb_exit();
}
return ret;
}
void proxy_go_input_unregister(void *data) {
struct flbgo_input_plugin *plugin;
plugin = (struct flbgo_input_plugin *) data;
flb_free(plugin->name);
flb_free(plugin);
}