mirror of https://github.com/facebook/rocksdb.git
502 lines
13 KiB
C++
502 lines
13 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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#include "util/string_util.h"
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <algorithm>
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#include <cinttypes>
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#include <cmath>
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#include <sstream>
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#include <string>
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#include <utility>
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#include <vector>
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#include "port/port.h"
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#include "port/sys_time.h"
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#include "rocksdb/slice.h"
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#ifndef __has_cpp_attribute
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#define ROCKSDB_HAS_CPP_ATTRIBUTE(x) 0
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#else
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#define ROCKSDB_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x)
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#endif
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#if ROCKSDB_HAS_CPP_ATTRIBUTE(maybe_unused) && __cplusplus >= 201703L
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#define ROCKSDB_MAYBE_UNUSED [[maybe_unused]]
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#elif ROCKSDB_HAS_CPP_ATTRIBUTE(gnu::unused) || __GNUC__
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#define ROCKSDB_MAYBE_UNUSED [[gnu::unused]]
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#else
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#define ROCKSDB_MAYBE_UNUSED
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#endif
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namespace ROCKSDB_NAMESPACE {
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const std::string kNullptrString = "nullptr";
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std::vector<std::string> StringSplit(const std::string& arg, char delim) {
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std::vector<std::string> splits;
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std::stringstream ss(arg);
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std::string item;
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while (std::getline(ss, item, delim)) {
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splits.push_back(item);
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}
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return splits;
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}
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// for micros < 10ms, print "XX us".
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// for micros < 10sec, print "XX ms".
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// for micros >= 10 sec, print "XX sec".
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// for micros <= 1 hour, print Y:X M:S".
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// for micros > 1 hour, print Z:Y:X H:M:S".
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int AppendHumanMicros(uint64_t micros, char* output, int len,
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bool fixed_format) {
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if (micros < 10000 && !fixed_format) {
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return snprintf(output, len, "%" PRIu64 " us", micros);
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} else if (micros < 10000000 && !fixed_format) {
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return snprintf(output, len, "%.3lf ms",
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static_cast<double>(micros) / 1000);
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} else if (micros < 1000000l * 60 && !fixed_format) {
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return snprintf(output, len, "%.3lf sec",
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static_cast<double>(micros) / 1000000);
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} else if (micros < 1000000ll * 60 * 60 && !fixed_format) {
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return snprintf(output, len, "%02" PRIu64 ":%05.3f M:S",
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micros / 1000000 / 60,
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static_cast<double>(micros % 60000000) / 1000000);
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} else {
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return snprintf(output, len, "%02" PRIu64 ":%02" PRIu64 ":%05.3f H:M:S",
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micros / 1000000 / 3600, (micros / 1000000 / 60) % 60,
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static_cast<double>(micros % 60000000) / 1000000);
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}
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}
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// for sizes >=10TB, print "XXTB"
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// for sizes >=10GB, print "XXGB"
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// etc.
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// append file size summary to output and return the len
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int AppendHumanBytes(uint64_t bytes, char* output, int len) {
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const uint64_t ull10 = 10;
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if (bytes >= ull10 << 40) {
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return snprintf(output, len, "%" PRIu64 "TB", bytes >> 40);
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} else if (bytes >= ull10 << 30) {
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return snprintf(output, len, "%" PRIu64 "GB", bytes >> 30);
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} else if (bytes >= ull10 << 20) {
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return snprintf(output, len, "%" PRIu64 "MB", bytes >> 20);
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} else if (bytes >= ull10 << 10) {
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return snprintf(output, len, "%" PRIu64 "KB", bytes >> 10);
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} else {
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return snprintf(output, len, "%" PRIu64 "B", bytes);
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}
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}
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void AppendNumberTo(std::string* str, uint64_t num) {
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char buf[30];
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snprintf(buf, sizeof(buf), "%" PRIu64, num);
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str->append(buf);
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}
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void AppendEscapedStringTo(std::string* str, const Slice& value) {
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for (size_t i = 0; i < value.size(); i++) {
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char c = value[i];
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if (c >= ' ' && c <= '~') {
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str->push_back(c);
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} else {
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char buf[10];
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snprintf(buf, sizeof(buf), "\\x%02x",
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static_cast<unsigned int>(c) & 0xff);
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str->append(buf);
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}
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}
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}
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std::string NumberToHumanString(int64_t num) {
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char buf[19];
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int64_t absnum = num < 0 ? -num : num;
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if (absnum < 10000) {
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snprintf(buf, sizeof(buf), "%" PRIi64, num);
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} else if (absnum < 10000000) {
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snprintf(buf, sizeof(buf), "%" PRIi64 "K", num / 1000);
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} else if (absnum < 10000000000LL) {
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snprintf(buf, sizeof(buf), "%" PRIi64 "M", num / 1000000);
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} else {
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snprintf(buf, sizeof(buf), "%" PRIi64 "G", num / 1000000000);
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}
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return std::string(buf);
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}
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std::string BytesToHumanString(uint64_t bytes) {
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const char* size_name[] = {"KB", "MB", "GB", "TB"};
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double final_size = static_cast<double>(bytes);
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size_t size_idx;
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// always start with KB
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final_size /= 1024;
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size_idx = 0;
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while (size_idx < 3 && final_size >= 1024) {
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final_size /= 1024;
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size_idx++;
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}
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char buf[20];
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snprintf(buf, sizeof(buf), "%.2f %s", final_size, size_name[size_idx]);
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return std::string(buf);
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}
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std::string TimeToHumanString(int unixtime) {
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char time_buffer[80];
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time_t rawtime = unixtime;
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struct tm tInfo;
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struct tm* timeinfo = localtime_r(&rawtime, &tInfo);
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assert(timeinfo == &tInfo);
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strftime(time_buffer, 80, "%c", timeinfo);
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return std::string(time_buffer);
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}
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std::string EscapeString(const Slice& value) {
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std::string r;
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AppendEscapedStringTo(&r, value);
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return r;
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}
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bool ConsumeDecimalNumber(Slice* in, uint64_t* val) {
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uint64_t v = 0;
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int digits = 0;
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while (!in->empty()) {
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char c = (*in)[0];
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if (c >= '0' && c <= '9') {
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++digits;
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const unsigned int delta = (c - '0');
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static const uint64_t kMaxUint64 = ~static_cast<uint64_t>(0);
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if (v > kMaxUint64 / 10 ||
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(v == kMaxUint64 / 10 && delta > kMaxUint64 % 10)) {
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// Overflow
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return false;
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}
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v = (v * 10) + delta;
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in->remove_prefix(1);
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} else {
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break;
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}
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}
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*val = v;
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return (digits > 0);
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}
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bool isSpecialChar(const char c) {
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if (c == '\\' || c == '#' || c == ':' || c == '\r' || c == '\n') {
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return true;
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}
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return false;
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}
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namespace {
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using CharMap = std::pair<char, char>;
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}
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char UnescapeChar(const char c) {
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static const CharMap convert_map[] = {{'r', '\r'}, {'n', '\n'}};
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auto iter = std::find_if(std::begin(convert_map), std::end(convert_map),
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[c](const CharMap& p) { return p.first == c; });
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if (iter == std::end(convert_map)) {
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return c;
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}
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return iter->second;
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}
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char EscapeChar(const char c) {
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static const CharMap convert_map[] = {{'\n', 'n'}, {'\r', 'r'}};
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auto iter = std::find_if(std::begin(convert_map), std::end(convert_map),
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[c](const CharMap& p) { return p.first == c; });
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if (iter == std::end(convert_map)) {
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return c;
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}
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return iter->second;
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}
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std::string EscapeOptionString(const std::string& raw_string) {
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std::string output;
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for (auto c : raw_string) {
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if (isSpecialChar(c)) {
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output += '\\';
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output += EscapeChar(c);
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} else {
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output += c;
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}
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}
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return output;
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}
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std::string UnescapeOptionString(const std::string& escaped_string) {
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bool escaped = false;
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std::string output;
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for (auto c : escaped_string) {
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if (escaped) {
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output += UnescapeChar(c);
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escaped = false;
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} else {
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if (c == '\\') {
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escaped = true;
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continue;
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}
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output += c;
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}
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}
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return output;
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}
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std::string trim(const std::string& str) {
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if (str.empty()) return std::string();
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size_t start = 0;
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size_t end = str.size() - 1;
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while (isspace(str[start]) != 0 && start < end) {
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++start;
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}
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while (isspace(str[end]) != 0 && start < end) {
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--end;
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}
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if (start <= end) {
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return str.substr(start, end - start + 1);
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}
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return std::string();
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}
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bool EndsWith(const std::string& string, const std::string& pattern) {
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size_t plen = pattern.size();
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size_t slen = string.size();
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if (plen <= slen) {
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return string.compare(slen - plen, plen, pattern) == 0;
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} else {
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return false;
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}
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}
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bool StartsWith(const std::string& string, const std::string& pattern) {
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return string.compare(0, pattern.size(), pattern) == 0;
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}
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#ifndef ROCKSDB_LITE
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bool ParseBoolean(const std::string& type, const std::string& value) {
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if (value == "true" || value == "1") {
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return true;
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} else if (value == "false" || value == "0") {
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return false;
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}
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throw std::invalid_argument(type);
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}
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uint8_t ParseUint8(const std::string& value) {
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uint64_t num = ParseUint64(value);
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if ((num >> 8LL) == 0) {
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return static_cast<uint8_t>(num);
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} else {
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throw std::out_of_range(value);
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}
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}
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uint32_t ParseUint32(const std::string& value) {
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uint64_t num = ParseUint64(value);
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if ((num >> 32LL) == 0) {
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return static_cast<uint32_t>(num);
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} else {
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throw std::out_of_range(value);
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}
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}
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int32_t ParseInt32(const std::string& value) {
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int64_t num = ParseInt64(value);
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if (num <= port::kMaxInt32 && num >= port::kMinInt32) {
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return static_cast<int32_t>(num);
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} else {
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throw std::out_of_range(value);
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}
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}
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#endif
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uint64_t ParseUint64(const std::string& value) {
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size_t endchar;
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#ifndef CYGWIN
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uint64_t num = std::stoull(value.c_str(), &endchar);
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#else
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char* endptr;
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uint64_t num = std::strtoul(value.c_str(), &endptr, 0);
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endchar = endptr - value.c_str();
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#endif
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if (endchar < value.length()) {
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char c = value[endchar];
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if (c == 'k' || c == 'K')
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num <<= 10LL;
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else if (c == 'm' || c == 'M')
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num <<= 20LL;
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else if (c == 'g' || c == 'G')
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num <<= 30LL;
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else if (c == 't' || c == 'T')
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num <<= 40LL;
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}
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return num;
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}
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int64_t ParseInt64(const std::string& value) {
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size_t endchar;
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#ifndef CYGWIN
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int64_t num = std::stoll(value.c_str(), &endchar);
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#else
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char* endptr;
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int64_t num = std::strtoll(value.c_str(), &endptr, 0);
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endchar = endptr - value.c_str();
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#endif
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if (endchar < value.length()) {
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char c = value[endchar];
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if (c == 'k' || c == 'K')
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num <<= 10LL;
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else if (c == 'm' || c == 'M')
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num <<= 20LL;
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else if (c == 'g' || c == 'G')
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num <<= 30LL;
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else if (c == 't' || c == 'T')
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num <<= 40LL;
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}
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return num;
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}
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int ParseInt(const std::string& value) {
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size_t endchar;
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#ifndef CYGWIN
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int num = std::stoi(value.c_str(), &endchar);
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#else
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char* endptr;
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int num = std::strtoul(value.c_str(), &endptr, 0);
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endchar = endptr - value.c_str();
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#endif
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if (endchar < value.length()) {
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char c = value[endchar];
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if (c == 'k' || c == 'K')
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num <<= 10;
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else if (c == 'm' || c == 'M')
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num <<= 20;
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else if (c == 'g' || c == 'G')
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num <<= 30;
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}
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return num;
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}
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double ParseDouble(const std::string& value) {
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#ifndef CYGWIN
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return std::stod(value);
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#else
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return std::strtod(value.c_str(), 0);
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#endif
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}
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size_t ParseSizeT(const std::string& value) {
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return static_cast<size_t>(ParseUint64(value));
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}
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std::vector<int> ParseVectorInt(const std::string& value) {
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std::vector<int> result;
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size_t start = 0;
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while (start < value.size()) {
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size_t end = value.find(':', start);
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if (end == std::string::npos) {
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result.push_back(ParseInt(value.substr(start)));
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break;
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} else {
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result.push_back(ParseInt(value.substr(start, end - start)));
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start = end + 1;
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}
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}
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return result;
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}
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bool SerializeIntVector(const std::vector<int>& vec, std::string* value) {
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*value = "";
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for (size_t i = 0; i < vec.size(); ++i) {
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if (i > 0) {
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*value += ":";
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}
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*value += ToString(vec[i]);
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}
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return true;
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}
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// Copied from folly/string.cpp:
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// https://github.com/facebook/folly/blob/0deef031cb8aab76dc7e736f8b7c22d701d5f36b/folly/String.cpp#L457
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// There are two variants of `strerror_r` function, one returns
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// `int`, and another returns `char*`. Selecting proper version using
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// preprocessor macros portably is extremely hard.
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//
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// For example, on Android function signature depends on `__USE_GNU` and
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// `__ANDROID_API__` macros (https://git.io/fjBBE).
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//
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// So we are using C++ overloading trick: we pass a pointer of
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// `strerror_r` to `invoke_strerror_r` function, and C++ compiler
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// selects proper function.
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#if !(defined(_WIN32) && (defined(__MINGW32__) || defined(_MSC_VER)))
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ROCKSDB_MAYBE_UNUSED
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static std::string invoke_strerror_r(int (*strerror_r)(int, char*, size_t),
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int err, char* buf, size_t buflen) {
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// Using XSI-compatible strerror_r
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int r = strerror_r(err, buf, buflen);
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// OSX/FreeBSD use EINVAL and Linux uses -1 so just check for non-zero
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if (r != 0) {
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snprintf(buf, buflen, "Unknown error %d (strerror_r failed with error %d)",
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err, errno);
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}
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return buf;
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}
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ROCKSDB_MAYBE_UNUSED
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static std::string invoke_strerror_r(char* (*strerror_r)(int, char*, size_t),
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int err, char* buf, size_t buflen) {
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// Using GNU strerror_r
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return strerror_r(err, buf, buflen);
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}
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#endif // !(defined(_WIN32) && (defined(__MINGW32__) || defined(_MSC_VER)))
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std::string errnoStr(int err) {
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char buf[1024];
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buf[0] = '\0';
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std::string result;
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// https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man3/strerror_r.3.html
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// http://www.kernel.org/doc/man-pages/online/pages/man3/strerror.3.html
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#if defined(_WIN32) && (defined(__MINGW32__) || defined(_MSC_VER))
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// mingw64 has no strerror_r, but Windows has strerror_s, which C11 added
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// as well. So maybe we should use this across all platforms (together
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// with strerrorlen_s). Note strerror_r and _s have swapped args.
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int r = strerror_s(buf, sizeof(buf), err);
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if (r != 0) {
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snprintf(buf, sizeof(buf),
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"Unknown error %d (strerror_r failed with error %d)", err, errno);
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}
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result.assign(buf);
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#else
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// Using any strerror_r
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result.assign(invoke_strerror_r(strerror_r, err, buf, sizeof(buf)));
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#endif
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return result;
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}
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} // namespace ROCKSDB_NAMESPACE
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