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Diffstat (limited to 'src/fluent-bit/plugins/in_exec_wasi/in_exec_wasi.c')
-rw-r--r--src/fluent-bit/plugins/in_exec_wasi/in_exec_wasi.c451
1 files changed, 451 insertions, 0 deletions
diff --git a/src/fluent-bit/plugins/in_exec_wasi/in_exec_wasi.c b/src/fluent-bit/plugins/in_exec_wasi/in_exec_wasi.c
new file mode 100644
index 000000000..bf765430d
--- /dev/null
+++ b/src/fluent-bit/plugins/in_exec_wasi/in_exec_wasi.c
@@ -0,0 +1,451 @@
+/* -*- 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_info.h>
+#include <fluent-bit/flb_input.h>
+#include <fluent-bit/flb_input_plugin.h>
+#include <fluent-bit/flb_config.h>
+#include <fluent-bit/flb_error.h>
+#include <fluent-bit/flb_utils.h>
+#include <fluent-bit/flb_pack.h>
+#include <fluent-bit/flb_parser.h>
+#include <fluent-bit/flb_kv.h>
+#include <msgpack.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef FLB_SYSTEM_WINDOWS
+#define STDIN_FILENO (_fileno( stdin ))
+#define STDOUT_FILENO (_fileno( stdout ))
+#define STDERR_FILENO (_fileno( stderr ))
+#else
+#include <unistd.h>
+#endif
+
+#include "in_exec_wasi.h"
+
+/* cb_collect callback */
+static int in_exec_wasi_collect(struct flb_input_instance *ins,
+ struct flb_config *config, void *in_context)
+{
+ int ret = -1;
+ uint64_t val;
+ size_t str_len = 0;
+ struct flb_exec_wasi *ctx = in_context;
+ struct flb_wasm *wasm = NULL;
+ FILE *stdoutp = tmpfile();
+
+ /* variables for parser */
+ int parser_ret = -1;
+ void *out_buf = NULL;
+ size_t out_size = 0;
+ struct flb_time out_time;
+
+ /* Validate the temporary file was created */
+ if (stdoutp == NULL) {
+ flb_plg_error(ctx->ins, "failed to created temporary file");
+ return -1;
+ }
+
+ if (ctx->oneshot == FLB_TRUE) {
+ ret = flb_pipe_r(ctx->ch_manager[0], &val, sizeof(val));
+ if (ret == -1) {
+ fclose(stdoutp);
+ flb_errno();
+ return -1;
+ }
+ }
+
+ wasm = flb_wasm_instantiate(config, ctx->wasi_path, ctx->accessible_dir_list, -1, fileno(stdoutp), -1);
+ if (wasm == NULL) {
+ flb_plg_debug(ctx->ins, "instantiate wasm [%s] failed", ctx->wasi_path);
+ goto collect_end;
+ }
+ ctx->wasm = wasm;
+
+ ret = flb_wasm_call_wasi_main(ctx->wasm);
+
+ if (!ret) {
+ flb_plg_error(ctx->ins, "WASI main function is not found");
+ goto collect_end;
+ }
+
+ if (ctx->parser) {
+ rewind(stdoutp);
+
+ while (fgets(ctx->buf, ctx->buf_size, stdoutp) != NULL) {
+ str_len = strnlen(ctx->buf, ctx->buf_size);
+ if (ctx->buf[str_len - 1] == '\n') {
+ ctx->buf[--str_len] = '\0'; /* chomp */
+ }
+
+ flb_time_get(&out_time);
+ parser_ret = flb_parser_do(ctx->parser, ctx->buf, str_len,
+ &out_buf, &out_size, &out_time);
+ if (parser_ret >= 0) {
+ if (flb_time_to_nanosec(&out_time) == 0L) {
+ flb_time_get(&out_time);
+ }
+
+ ret = flb_log_event_encoder_begin_record(&ctx->log_encoder);
+
+ 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(ctx->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_log_event_encoder_reset(&ctx->log_encoder);
+
+ 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");
+ }
+ }
+ }
+ else {
+ rewind(stdoutp);
+
+ while (fgets(ctx->buf, ctx->buf_size, stdoutp) != NULL) {
+ str_len = strnlen(ctx->buf, ctx->buf_size);
+ if (ctx->buf[str_len - 1] == '\n') {
+ ctx->buf[--str_len] = '\0'; /* chomp */
+ }
+
+ ret = flb_log_event_encoder_begin_record(&ctx->log_encoder);
+
+ 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_cstring(
+ &ctx->log_encoder, "wasi_stdout");
+ }
+
+ if (ret == FLB_EVENT_ENCODER_SUCCESS) {
+ ret = flb_log_event_encoder_append_body_string(
+ &ctx->log_encoder,
+ 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(ctx->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_log_event_encoder_reset(&ctx->log_encoder);
+ }
+ }
+
+ collect_end:
+ if (ctx->wasm != NULL) {
+ flb_wasm_destroy(ctx->wasm);
+ }
+ fclose(stdoutp);
+
+ return ret;
+}
+
+/* read config file and*/
+static int in_exec_wasi_config_read(struct flb_exec_wasi *ctx,
+ struct flb_input_instance *in,
+ struct flb_config *config)
+{
+ int ret;
+
+ ctx->ins = in;
+
+ /* Load the config map */
+ ret = flb_input_config_map_set(in, (void *)ctx);
+ if (ret == -1) {
+ flb_plg_error(in, "unable to load configuration");
+ return -1;
+ }
+
+ /* filepath setting */
+ if (ctx->wasi_path == NULL) {
+ flb_plg_error(in, "no input 'command' was given");
+ return -1;
+ }
+
+ if (ctx->parser_name != NULL) {
+ ctx->parser = flb_parser_get(ctx->parser_name, config);
+ if (ctx->parser == NULL) {
+ flb_plg_error(in, "requested parser '%s' not found", ctx->parser_name);
+ }
+ }
+
+ if (ctx->buf_size == -1) {
+ flb_plg_error(in, "buffer size is invalid");
+ return -1;
+ }
+
+ if (ctx->interval_sec <= 0 && ctx->interval_nsec <= 0) {
+ /* Illegal settings. Override them. */
+ ctx->interval_sec = atoi(DEFAULT_INTERVAL_SEC);
+ ctx->interval_nsec = atoi(DEFAULT_INTERVAL_NSEC);
+ }
+
+ if (ctx->oneshot) {
+ ctx->interval_sec = -1;
+ ctx->interval_nsec = -1;
+ }
+
+ ret = flb_log_event_encoder_init(&ctx->log_encoder,
+ FLB_LOG_EVENT_FORMAT_DEFAULT);
+
+ if (ret != FLB_EVENT_ENCODER_SUCCESS) {
+ flb_plg_error(ctx->ins, "error initializing event encoder : %d", ret);
+
+ return -1;
+ }
+
+ flb_plg_debug(in, "interval_sec=%d interval_nsec=%d oneshot=%i buf_size=%zu",
+ ctx->interval_sec, ctx->interval_nsec, ctx->oneshot, ctx->buf_size);
+
+ return 0;
+}
+
+static void delete_exec_wasi_config(struct flb_exec_wasi *ctx)
+{
+ if (!ctx) {
+ return;
+ }
+
+ flb_log_event_encoder_destroy(&ctx->log_encoder);
+
+ /* release buffer */
+ if (ctx->buf != NULL) {
+ flb_free(ctx->buf);
+ }
+
+ if (ctx->ch_manager[0] > -1) {
+ flb_pipe_close(ctx->ch_manager[0]);
+ }
+
+ if (ctx->ch_manager[1] > -1) {
+ flb_pipe_close(ctx->ch_manager[1]);
+ }
+
+ flb_free(ctx);
+}
+
+/* Initialize plugin */
+static int in_exec_wasi_init(struct flb_input_instance *in,
+ struct flb_config *config, void *data)
+{
+ struct flb_exec_wasi *ctx = NULL;
+ int ret = -1;
+
+ /* Allocate space for the configuration */
+ ctx = flb_malloc(sizeof(struct flb_exec_wasi));
+ if (!ctx) {
+ return -1;
+ }
+ ctx->parser = NULL;
+ ctx->parser_name = NULL;
+ ctx->wasm = NULL;
+ ctx->wasi_path = NULL;
+ ctx->oneshot = FLB_FALSE;
+
+ /* Initialize exec config */
+ ret = in_exec_wasi_config_read(ctx, in, config);
+ if (ret < 0) {
+ goto init_error;
+ }
+
+ flb_wasm_init(config);
+
+ ctx->buf = flb_malloc(ctx->buf_size);
+ if (ctx->buf == NULL) {
+ flb_plg_error(in, "could not allocate exec buffer");
+ goto init_error;
+ }
+
+ flb_input_set_context(in, ctx);
+
+ ctx->ch_manager[0] = -1;
+ ctx->ch_manager[1] = -1;
+
+ if (ctx->oneshot == FLB_TRUE) {
+ if (flb_pipe_create(ctx->ch_manager)) {
+ flb_plg_error(in, "could not create pipe for oneshot command");
+ goto init_error;
+ }
+
+ ret = flb_input_set_collector_event(in,
+ in_exec_wasi_collect,
+ ctx->ch_manager[0], config);
+ }
+ else {
+ ret = flb_input_set_collector_time(in,
+ in_exec_wasi_collect,
+ ctx->interval_sec,
+ ctx->interval_nsec, config);
+ }
+ if (ret < 0) {
+ flb_plg_error(in, "could not set collector for exec input plugin");
+ goto init_error;
+ }
+ ctx->coll_fd = ret;
+
+ return 0;
+
+ init_error:
+ delete_exec_wasi_config(ctx);
+
+ return -1;
+}
+
+static void in_exec_wasi_pause(void *data, struct flb_config *config)
+{
+ struct flb_exec_wasi *ctx = data;
+
+ flb_input_collector_pause(ctx->coll_fd, ctx->ins);
+}
+
+static void in_exec_wasi_resume(void *data, struct flb_config *config)
+{
+ struct flb_exec_wasi *ctx = data;
+
+ flb_input_collector_resume(ctx->coll_fd, ctx->ins);
+}
+
+static int in_exec_wasi_prerun(struct flb_input_instance *ins,
+ struct flb_config *config, void *in_context)
+{
+ int ret;
+ uint64_t val = 0xc003; /* dummy constant */
+ struct flb_exec_wasi *ctx = in_context;
+ (void) ins;
+ (void) config;
+
+ if (ctx->oneshot == FLB_FALSE) {
+ return 0;
+ }
+
+ /* Kick the oneshot execution */
+ ret = flb_pipe_w(ctx->ch_manager[1], &val, sizeof(val));
+ if (ret == -1) {
+ flb_errno();
+ return -1;
+ }
+ return 0;
+}
+
+static int in_exec_wasi_exit(void *data, struct flb_config *config)
+{
+ struct flb_exec_wasi *ctx = data;
+
+ flb_wasm_destroy_all(config);
+ delete_exec_wasi_config(ctx);
+ return 0;
+}
+
+static struct flb_config_map config_map[] = {
+ {
+ FLB_CONFIG_MAP_STR, "wasi_path", NULL,
+ 0, FLB_TRUE, offsetof(struct flb_exec_wasi, wasi_path),
+ "Set the path of WASM program to execute"
+ },
+ {
+ FLB_CONFIG_MAP_CLIST, "accessible_paths", ".",
+ 0, FLB_TRUE, offsetof(struct flb_exec_wasi, accessible_dir_list),
+ "Specifying paths to be accessible from a WASM program."
+ "Default value is current working directory"
+ },
+ {
+ FLB_CONFIG_MAP_STR, "parser", NULL,
+ 0, FLB_TRUE, offsetof(struct flb_exec_wasi, parser_name),
+ "Set a parser"
+ },
+ {
+ FLB_CONFIG_MAP_INT, "interval_sec", DEFAULT_INTERVAL_SEC,
+ 0, FLB_TRUE, offsetof(struct flb_exec_wasi, interval_sec),
+ "Set the collector interval"
+ },
+ {
+ FLB_CONFIG_MAP_INT, "interval_nsec", DEFAULT_INTERVAL_NSEC,
+ 0, FLB_TRUE, offsetof(struct flb_exec_wasi, interval_nsec),
+ "Set the collector interval (nanoseconds)"
+ },
+ {
+ FLB_CONFIG_MAP_SIZE, "buf_size", DEFAULT_BUF_SIZE,
+ 0, FLB_TRUE, offsetof(struct flb_exec_wasi, buf_size),
+ "Set the buffer size"
+ },
+ {
+ FLB_CONFIG_MAP_BOOL, "bool", "false",
+ 0, FLB_TRUE, offsetof(struct flb_exec_wasi, oneshot),
+ "execute the command only once"
+ },
+ /* EOF */
+ {0}
+};
+
+struct flb_input_plugin in_exec_wasi_plugin = {
+ .name = "exec_wasi",
+ .description = "Exec WASI Input",
+ .cb_init = in_exec_wasi_init,
+ .cb_pre_run = in_exec_wasi_prerun,
+ .cb_pause = in_exec_wasi_pause,
+ .cb_resume = in_exec_wasi_resume,
+ .cb_collect = in_exec_wasi_collect,
+ .cb_flush_buf = NULL,
+ .cb_exit = in_exec_wasi_exit,
+ .config_map = config_map
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-08-08 19:36:51 +0000