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[cdc_stream] [cdc_rsync] Add --forward-port flag (#45)

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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
This commit is contained in:
Lutz Justen
2022-12-19 10:04:36 +01:00
committed by GitHub
parent f8438aec66
commit d8c2b5906e
25 changed files with 419 additions and 164 deletions
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24
common/port_manager_win.cc
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@@ -121,8 +121,7 @@ PortManager::~PortManager() {
}
}
absl::StatusOr<int> PortManager::ReservePort(bool check_remote,
int remote_timeout_sec) {
absl::StatusOr<int> PortManager::ReservePort(int remote_timeout_sec) {
// Find available port on workstation.
std::unordered_set<int> local_ports;
ASSIGN_OR_RETURN(local_ports,
@@ -132,13 +131,11 @@ absl::StatusOr<int> PortManager::ReservePort(bool check_remote,
// Find available port on remote instance.
std::unordered_set<int> remote_ports = local_ports;
if (check_remote) {
ASSIGN_OR_RETURN(remote_ports,
FindAvailableRemotePorts(
first_port_, last_port_, "0.0.0.0", process_factory_,
remote_util_, remote_timeout_sec, steady_clock_),
"Failed to find available ports on instance");
}
ASSIGN_OR_RETURN(remote_ports,
FindAvailableRemotePorts(first_port_, last_port_, "0.0.0.0",
process_factory_, remote_util_,
remote_timeout_sec, steady_clock_),
"Failed to find available ports on instance");
// Fetch shared memory.
void* mem;
@@ -290,9 +287,14 @@ absl::StatusOr<std::unordered_set<int>> PortManager::FindAvailablePorts(
int first_port, int last_port, const std::string& netstat_output,
const char* ip) {
std::unordered_set<int> available_ports;
for (int port = first_port; port <= last_port; ++port) {
std::vector<std::string> lines = absl::StrSplit(netstat_output, '\n');
std::vector<std::string> lines;
for (const auto& line : absl::StrSplit(netstat_output, '\n')) {
if (absl::StrContains(line, ip)) {
lines.push_back(std::string(line));
}
}
for (int port = first_port; port <= last_port; ++port) {
bool port_occupied = false;
std::string portToken = absl::StrFormat("%s:%i", ip, port);
for (const std::string& line : lines) {