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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include <aws/common/file.h>
#include <aws/common/log_writer.h>
#include <aws/common/string.h>
#include <errno.h>
#include <stdio.h>
/*
* Basic log writer implementations - stdout, stderr, arbitrary file
*/
struct aws_file_writer;
struct aws_file_writer {
FILE *log_file;
bool close_file_on_cleanup;
};
static int s_aws_file_writer_write(struct aws_log_writer *writer, const struct aws_string *output) {
struct aws_file_writer *impl = (struct aws_file_writer *)writer->impl;
size_t length = output->len;
if (fwrite(output->bytes, 1, length, impl->log_file) < length) {
int errno_value = errno; /* Always cache errno before potential side-effect */
return aws_translate_and_raise_io_error(errno_value);
}
return AWS_OP_SUCCESS;
}
static void s_aws_file_writer_clean_up(struct aws_log_writer *writer) {
struct aws_file_writer *impl = (struct aws_file_writer *)writer->impl;
if (impl->close_file_on_cleanup) {
fclose(impl->log_file);
}
aws_mem_release(writer->allocator, impl);
}
static struct aws_log_writer_vtable s_aws_file_writer_vtable = {
.write = s_aws_file_writer_write,
.clean_up = s_aws_file_writer_clean_up,
};
/*
* Shared internal init implementation
*/
static int s_aws_file_writer_init_internal(
struct aws_log_writer *writer,
struct aws_allocator *allocator,
const char *file_name_to_open,
FILE *currently_open_file) {
/* One or the other should be set */
if (!((file_name_to_open != NULL) ^ (currently_open_file != NULL))) {
return aws_raise_error(AWS_ERROR_INVALID_ARGUMENT);
}
/* Allocate and initialize the file writer */
struct aws_file_writer *impl = aws_mem_calloc(allocator, 1, sizeof(struct aws_file_writer));
if (impl == NULL) {
return AWS_OP_ERR;
}
impl->log_file = NULL;
impl->close_file_on_cleanup = false;
/* Open file if name passed in */
if (file_name_to_open != NULL) {
impl->log_file = aws_fopen(file_name_to_open, "a+");
if (impl->log_file == NULL) {
aws_mem_release(allocator, impl);
return AWS_OP_ERR;
}
impl->close_file_on_cleanup = true;
} else {
impl->log_file = currently_open_file;
}
writer->vtable = &s_aws_file_writer_vtable;
writer->allocator = allocator;
writer->impl = impl;
return AWS_OP_SUCCESS;
}
/*
* Public initialization interface
*/
int aws_log_writer_init_stdout(struct aws_log_writer *writer, struct aws_allocator *allocator) {
return s_aws_file_writer_init_internal(writer, allocator, NULL, stdout);
}
int aws_log_writer_init_stderr(struct aws_log_writer *writer, struct aws_allocator *allocator) {
return s_aws_file_writer_init_internal(writer, allocator, NULL, stderr);
}
int aws_log_writer_init_file(
struct aws_log_writer *writer,
struct aws_allocator *allocator,
struct aws_log_writer_file_options *options) {
return s_aws_file_writer_init_internal(writer, allocator, options->filename, options->file);
}
void aws_log_writer_clean_up(struct aws_log_writer *writer) {
AWS_ASSERT(writer->vtable->clean_up);
(writer->vtable->clean_up)(writer);
}
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