mirror of
https://github.com/nestriness/cdc-file-transfer.git
synced 2026-01-30 14:05:36 +02:00
d8c2b5906e
Adds a flag to set the SSH forwarding port or port range used for 'cdc_stream start-service' and 'cdc_rsync'. If a single number is passed, e.g. --forward-port 12345, then this port is used without checking availability of local and remote ports. If the port is taken, this results in an error when trying to connect. Note that this restricts the number of connections that stream can make to one. If a range is passed, e.g. --forward-port 45000-46000, the tools search for available ports locally and remotely in that range. This is more robust, but a bit slower due to the extra overhead. Optimizes port_manager_win as it was very slow for a large port range. It's still not optimal, but the time needed to scan 30k ports is << 1 seconds now. Fixes #12
124 lines
3.6 KiB
C++
124 lines
3.6 KiB
C++
// Copyright 2022 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// 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, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "cdc_stream/base_command.h"
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#include "absl/strings/str_format.h"
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#include "absl/strings/str_split.h"
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#include "absl_helper/jedec_size_flag.h"
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#include "common/port_range_parser.h"
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#include "lyra/lyra.hpp"
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namespace cdc_ft {
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BaseCommand::BaseCommand(std::string name, std::string help, int* exit_code)
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: name_(name), help_(help), exit_code_(exit_code) {
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assert(exit_code_);
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}
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BaseCommand::~BaseCommand() = default;
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void BaseCommand::Register(lyra::cli& cli) {
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lyra::command cmd(name_,
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[this](const lyra::group& g) { this->CommandHandler(g); });
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cmd.help(help_);
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cmd.add_argument(lyra::help(show_help_));
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RegisterCommandLineFlags(cmd);
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// Detect extra positional args.
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cmd.add_argument(lyra::arg(PosArgValidator(&extra_positional_arg_), ""));
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// Register command with CLI.
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cli.add_argument(std::move(cmd));
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}
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std::function<void(const std::string&)> BaseCommand::JedecParser(
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const char* flag_name, uint64_t* bytes) {
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return [flag_name, bytes, error = &parse_error_](const std::string& value) {
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JedecSize size;
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if (AbslParseFlag(value, &size, error)) {
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*bytes = size.Size();
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} else {
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*error = absl::StrFormat("Failed to parse %s=%s: %s", flag_name, value,
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*error);
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}
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};
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}
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std::function<void(const std::string&)> BaseCommand::PortRangeParser(
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const char* flag_name, uint16_t* first, uint16_t* last) {
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return [flag_name, first, last,
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error = &parse_error_](const std::string& value) {
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if (!port_range::Parse(value.c_str(), first, last)) {
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*error = absl::StrFormat(
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"Failed to parse %s=%s, expected <port> or <port1>-<port2>",
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flag_name, value);
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}
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};
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}
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std::function<void(const std::string&)> BaseCommand::PosArgValidator(
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std::string* str) {
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return [str, invalid_arg = &invalid_arg_](const std::string& value) {
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if (!value.empty() && value[0] == '-') {
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*invalid_arg = value;
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} else {
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*str = value;
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}
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};
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}
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void BaseCommand::CommandHandler(const lyra::group& g) {
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// Handle -h, --help.
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if (show_help_) {
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std::cout << g;
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*exit_code_ = 0;
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return;
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}
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// Handle invalid arguments.
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if (!invalid_arg_.empty()) {
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std::cerr << "Error: Unknown parameter '" << invalid_arg_
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<< "'. Try -h for help." << std::endl;
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*exit_code_ = 1;
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return;
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}
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if (!parse_error_.empty()) {
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std::cerr << "Error: " << parse_error_ << std::endl;
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*exit_code_ = 1;
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return;
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}
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if (!extra_positional_arg_.empty()) {
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std::cerr << "Error: Extraneous positional argument '"
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<< extra_positional_arg_ << "'. Try -h for help." << std::endl;
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*exit_code_ = 1;
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return;
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}
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// Run and print error.
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absl::Status status = Run();
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if (!status.ok()) {
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std::cerr << "Error: " << status.message() << std::endl;
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}
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// Write status code to |exit_code_|.
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static_assert(static_cast<int>(absl::StatusCode::kOk) == 0, "kOk not 0");
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*exit_code_ = static_cast<int>(status.code());
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}
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} // namespace cdc_ft
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