131 lines
3.8 KiB
C++
131 lines
3.8 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#include "exec/local_file_reader.h"
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#include <sys/stat.h>
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#include <unistd.h>
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#include "common/logging.h"
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namespace doris {
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LocalFileReader::LocalFileReader(const std::string& path, int64_t start_offset)
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: _path(path), _current_offset(start_offset), _file_size(-1), _fp(nullptr) {}
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LocalFileReader::~LocalFileReader() {
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close();
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}
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Status LocalFileReader::open() {
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_fp = fopen(_path.c_str(), "r");
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if (_fp == nullptr) {
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char err_buf[64];
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std::stringstream ss;
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ss << "Open file failed. path=" << _path << ", error=" << strerror_r(errno, err_buf, 64);
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return Status::InternalError(ss.str());
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}
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return seek(_current_offset);
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}
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void LocalFileReader::close() {
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if (_fp != nullptr) {
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fclose(_fp);
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_fp = nullptr;
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}
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}
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bool LocalFileReader::closed() {
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return _fp == nullptr;
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}
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// Read all bytes
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Status LocalFileReader::read_one_message(std::unique_ptr<uint8_t[]>* buf, int64_t* length) {
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bool eof;
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int64_t file_size = size() - _current_offset;
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if (file_size <= 0) {
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buf->reset();
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*length = 0;
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return Status::OK();
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}
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buf->reset(new uint8_t[file_size]);
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read(buf->get(), file_size, length, &eof);
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return Status::OK();
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}
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Status LocalFileReader::read(uint8_t* buf, int64_t buf_len, int64_t* bytes_read, bool* eof) {
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readat(_current_offset, buf_len, bytes_read, buf);
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if (*bytes_read == 0) {
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*eof = true;
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} else {
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*eof = false;
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}
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return Status::OK();
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}
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Status LocalFileReader::readat(int64_t position, int64_t nbytes, int64_t* bytes_read, void* out) {
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if (position != _current_offset) {
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int ret = fseek(_fp, position, SEEK_SET);
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if (ret != 0) { // check fseek return value
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return Status::InternalError(strerror(errno));
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}
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}
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*bytes_read = fread(out, 1, nbytes, _fp);
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if (*bytes_read == 0 && ferror(_fp)) {
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char err_buf[64];
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std::stringstream ss;
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ss << "Read file failed. path=" << _path << ", error=" << strerror_r(errno, err_buf, 64);
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return Status::InternalError(ss.str());
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}
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_current_offset = ftell(_fp); // save offset with file
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return Status::OK();
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}
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int64_t LocalFileReader::size() {
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if (_file_size == -1) {
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int ret;
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struct stat buf;
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ret = fstat(fileno(_fp), &buf);
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if (ret) {
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LOG(WARNING) << "Get file size is error, errno: " << errno << ", msg "
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<< strerror(errno);
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return -1;
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}
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_file_size = buf.st_size;
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}
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return _file_size;
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}
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Status LocalFileReader::seek(int64_t position) {
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int res = fseek(_fp, position, SEEK_SET);
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if (res != 0) {
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char err_buf[64];
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std::stringstream ss;
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ss << "Seek to start_offset failed. offset=" << position
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<< ", error=" << strerror_r(errno, err_buf, 64);
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return Status::InternalError(ss.str());
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}
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return Status::OK();
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}
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Status LocalFileReader::tell(int64_t* position) {
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*position = _current_offset;
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return Status::OK();
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}
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} // namespace doris
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