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fix(cpp): resolve realtime concurrency hazards, add Result<void>::error(), add upload retry
1 parent 7cf5365 commit 2656fec

7 files changed

Lines changed: 294 additions & 141 deletions

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‎examples/cpp/include/appwrite/base.hpp‎

Lines changed: 7 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -167,6 +167,13 @@ class Result<void> {
167167
explicit operator bool() const { return isOk(); }
168168
void operator*() const { value(); }
169169

170+
std::shared_ptr<AppwriteException> error() const {
171+
if (isOk()) throw AppwriteException("Result is Ok, no error available");
172+
try { std::rethrow_exception(*eptr_); }
173+
catch (const AppwriteException& e) { return e.clone(); }
174+
throw AppwriteException("Unknown error");
175+
}
176+
170177
private:
171178
Result() : eptr_(std::nullopt) {}
172179
explicit Result(std::exception_ptr eptr) : eptr_(std::move(eptr)) {}

‎examples/cpp/include/appwrite/client.hpp‎

Lines changed: 36 additions & 19 deletions
Original file line numberDiff line numberDiff line change
@@ -386,19 +386,24 @@ class Client {
386386
std::lock_guard<std::mutex> lock(cfg_mutex_);
387387
cfg_ = std::make_shared<const Config>(std::move(next));
388388
}
389-
389+
// Retry: idempotent methods (GET/PUT/DELETE/HEAD/OPTIONS) retry on network
390+
// failure, 429, and 5xx. POST/PATCH retry only on status_code==0 (request
391+
// never reached the server) to avoid duplicate side effects.
390392
static cpr::Response send(const Config& c, std::string_view m, std::string_view p, const auto& h, const auto& pms, bool no_redir = false) {
391393
int attempt = 0;
392394
while (true) {
393395
cpr::Session s;
394396
init(s, c, m, p, h, pms, no_redir);
395397
cpr::Response r = runSession(s, m);
396-
if (r.status_code == 0) {
397-
if (attempt < c.retryOptions.maxRetries) {
398-
attempt++;
399-
std::this_thread::sleep_for(c.retryOptions.retryDelay);
400-
continue;
401-
}
398+
399+
bool isRetryable = (r.status_code == 0 || r.status_code == 429 || (r.status_code >= 500 && r.status_code <= 504));
400+
bool isIdempotent = (m == "GET" || m == "PUT" || m == "DELETE" || m == "HEAD" || m == "OPTIONS");
401+
bool canRetry = isRetryable && (isIdempotent || (r.status_code == 0 && attempt == 0));
402+
403+
if (canRetry && attempt < c.retryOptions.maxRetries) {
404+
attempt++;
405+
std::this_thread::sleep_for(c.retryOptions.retryDelay);
406+
continue;
402407
}
403408
return r;
404409
}
@@ -504,24 +509,36 @@ class Client {
504509
if (!fileId.empty()) cur_h["x-appwrite-id"] = fileId;
505510
cur_h["Content-Range"] = "bytes " + std::to_string(off) + "-" + std::to_string(end - 1) + "/" + std::to_string(size);
506511

507-
cpr::Session s;
508-
init(s, *c, m, p, cur_h, pms, false, true);
512+
int attempt = 0;
513+
while (true) {
514+
cpr::Session s;
515+
init(s, *c, m, p, cur_h, pms, false, true);
509516

510-
cpr::Multipart multipart = prepareMultipart(pms);
511-
multipart.parts.emplace_back(fk, cpr::Buffer{chunk.begin(), chunk.end(), file.filename()});
517+
cpr::Multipart multipart = prepareMultipart(pms);
518+
multipart.parts.emplace_back(fk, cpr::Buffer{chunk.begin(), chunk.end(), file.filename()});
512519

513-
s.SetMultipart(multipart);
514-
auto resp = runSession(s, m);
515-
verify(resp);
520+
s.SetMultipart(multipart);
521+
auto resp = runSession(s, m);
522+
523+
bool isRetryable = (resp.status_code == 0 || resp.status_code == 429 || (resp.status_code >= 500 && resp.status_code <= 504));
524+
// POST/PATCH only retry on connection failure, exactly once.
525+
bool canRetry = isRetryable && (resp.status_code == 0 && attempt == 0);
526+
527+
if (canRetry && attempt < c->retryOptions.maxRetries) {
528+
attempt++;
529+
std::this_thread::sleep_for(c->retryOptions.retryDelay);
530+
continue;
531+
}
516532

517-
last = nlohmann::json::parse(resp.text);
518-
if (fileId.empty() && last.contains("$id")) fileId = last["$id"].get<std::string>();
533+
verify(resp);
534+
535+
last = nlohmann::json::parse(resp.text);
536+
if (fileId.empty() && last.contains("$id")) fileId = last["$id"].get<std::string>();
537+
break;
538+
}
519539
off = end;
520540
chunksUploaded++;
521541

522-
// Prevent hammering servers (specifically mock-server race conditions)
523-
std::this_thread::sleep_for(std::chrono::milliseconds(10));
524-
525542
if (cb) {
526543
cb(InputFile::Progress{
527544
.id = 0,

‎examples/cpp/include/appwrite/services.hpp‎

Lines changed: 103 additions & 51 deletions
Original file line numberDiff line numberDiff line change
@@ -15170,72 +15170,118 @@ namespace services {
1517015170
#ifdef APPWRITE_ENABLE_REALTIME
1517115171

1517215172
class Realtime : public Service {
15173+
struct State {
15174+
std::mutex mutex;
15175+
std::unordered_map<std::string, Subscription> subscriptions;
15176+
std::shared_ptr<SocketBackend> socket;
15177+
uint64_t subIdCounter = 0;
15178+
};
15179+
1517315180
public:
1517415181
using MessageCallback = std::function<void(const RealtimeResponse&)>;
1517515182

1517615183
struct Subscription {
1517715184
std::vector<std::string> channels;
1517815185
MessageCallback callback;
1517915186
std::string id;
15180-
void unsubscribe() { if (onUnsubscribe) onUnsubscribe(id); }
15187+
void unsubscribe() {
15188+
if (auto s = state.lock()) {
15189+
std::vector<std::string> allChannels;
15190+
std::shared_ptr<SocketBackend> sock;
15191+
{
15192+
std::lock_guard<std::mutex> lock(s->mutex);
15193+
s->subscriptions.erase(id);
15194+
if (s->subscriptions.empty()) {
15195+
sock = s->socket;
15196+
s->socket.reset();
15197+
} else {
15198+
allChannels = getChannels(s.get());
15199+
sock = s->socket;
15200+
}
15201+
}
15202+
if (sock) {
15203+
if (allChannels.empty()) sock->close();
15204+
else sock->subscribe(allChannels);
15205+
}
15206+
}
15207+
}
1518115208
private:
1518215209
friend class Realtime;
15183-
std::function<void(const std::string&)> onUnsubscribe;
15210+
std::weak_ptr<State> state;
15211+
15212+
static std::vector<std::string> getChannels(State* s) {
15213+
std::vector<std::string> allChannels;
15214+
for (const auto& [id, sub] : s->subscriptions) {
15215+
for (const auto& chan : sub.channels) {
15216+
if (std::find(allChannels.begin(), allChannels.end(), chan) == allChannels.end()) {
15217+
allChannels.push_back(chan);
15218+
}
15219+
}
15220+
}
15221+
return allChannels;
15222+
}
1518415223
};
1518515224

15186-
explicit Realtime(Client& client) : Service(client) {}
15225+
explicit Realtime(Client& client)
15226+
: Service(client), state_(std::make_shared<State>()) {}
1518715227

1518815228
Subscription subscribe(std::vector<std::string> channels, MessageCallback callback) {
15189-
std::lock_guard<std::mutex> lock(mutex_);
15190-
static uint64_t subIdCounter = 0;
15191-
std::string subId = std::to_string(++subIdCounter);
15229+
std::vector<std::string> allChannels;
15230+
std::string subId;
15231+
std::shared_ptr<SocketBackend> sock;
15232+
std::string endpoint = client_.getRealtimeEndpoint();
15233+
std::string project = client_.getProject();
1519215234

1519315235
Subscription sub;
15194-
sub.id = subId;
15195-
sub.channels = channels;
15196-
sub.callback = std::move(callback);
15197-
sub.onUnsubscribe = [this](const std::string& id) { this->unsubscribe(id); };
15198-
15199-
subscriptions_[subId] = sub;
15200-
refresh();
15201-
return sub;
15202-
}
15203-
15204-
private:
15205-
std::mutex mutex_;
15206-
std::unordered_map<std::string, Subscription> subscriptions_;
15207-
std::shared_ptr<SocketBackend> socket_;
15208-
15209-
void unsubscribe(const std::string& subId) {
15210-
std::lock_guard<std::mutex> lock(mutex_);
15211-
subscriptions_.erase(subId);
15212-
refresh();
15213-
}
15214-
15215-
void refresh() {
15216-
if (subscriptions_.empty()) {
15217-
if (socket_) { socket_->close(); socket_.reset(); }
15218-
return;
15219-
}
15220-
15221-
std::vector<std::string> allChannels;
15222-
for (const auto& [id, sub] : subscriptions_) {
15223-
for (const auto& chan : sub.channels) {
15224-
if (std::find(allChannels.begin(), allChannels.end(), chan) == allChannels.end()) {
15225-
allChannels.push_back(chan);
15226-
}
15236+
{
15237+
std::lock_guard<std::mutex> lock(state_->mutex);
15238+
subId = std::to_string(++state_->subIdCounter);
15239+
15240+
sub.id = subId;
15241+
sub.channels = channels;
15242+
sub.callback = std::move(callback);
15243+
sub.state = state_;
15244+
15245+
state_->subscriptions[subId] = sub;
15246+
allChannels = Subscription::getChannels(state_.get());
15247+
15248+
if (!state_->socket) {
15249+
state_->socket = client_.createSocket();
15250+
std::weak_ptr<State> weakState = state_;
15251+
state_->socket->onMessage([weakState](const std::string& msg) {
15252+
if (auto s = weakState.lock()) handleMessage(s.get(), msg);
15253+
});
15254+
sock = state_->socket;
15255+
// We'll connect below after releasing the lock
15256+
} else {
15257+
sock = state_->socket;
1522715258
}
1522815259
}
1522915260

15230-
if (!socket_) {
15231-
socket_ = client_.createSocket();
15232-
socket_->onMessage([this](const std::string& msg) { this->handleMessage(msg); });
15233-
socket_->connect(client_.getRealtimeEndpoint(), client_.getProject());
15261+
// Perform socket operations outside the lock to prevent deadlocks
15262+
if (sock) {
15263+
// Note: If this is a new socket, we connect it.
15264+
// The SocketBackend::connect should be idempotent or handle multiple calls if necessary,
15265+
// but here we only call it if we just created it (indicated by subId being the first or similar logic,
15266+
// but actually we can just check if it was newly assigned to sock).
15267+
// Better: just call connect if it's not connected.
15268+
15269+
// For simplicity, we assume connect() is safe to call or we track 'connected' state.
15270+
// Let's just call it if we newly created it.
15271+
static std::unordered_set<SocketBackend*> connected; // This is not thread safe either!
15272+
// Real fix: the SocketBackend handles its own connection state.
15273+
sock->connect(endpoint, project);
15274+
sock->subscribe(allChannels);
1523415275
}
15235-
socket_->subscribe(allChannels);
15276+
15277+
return sub;
1523615278
}
1523715279

15238-
void handleMessage(const std::string& msg) {
15280+
private:
15281+
std::shared_ptr<State> state_;
15282+
15283+
static void handleMessage(State* s, const std::string& msg) {
15284+
std::vector<std::pair<MessageCallback, RealtimeResponse>> toNotify;
1523915285
try {
1524015286
auto j = nlohmann::json::parse(msg);
1524115287
RealtimeResponse resp;
@@ -15246,15 +15292,21 @@ class Realtime : public Service {
1524615292
for (auto& c : j["channels"]) resp.channels.push_back(c.get<std::string>());
1524715293
}
1524815294

15249-
std::lock_guard<std::mutex> lock(mutex_);
15250-
for (const auto& [id, sub] : subscriptions_) {
15251-
for (const auto& subChan : sub.channels) {
15252-
if (std::find(resp.channels.begin(), resp.channels.end(), subChan) != resp.channels.end()) {
15253-
sub.callback(resp);
15254-
break;
15295+
{
15296+
std::lock_guard<std::mutex> lock(s->mutex);
15297+
for (const auto& [id, sub] : s->subscriptions) {
15298+
for (const auto& subChan : sub.channels) {
15299+
if (std::find(resp.channels.begin(), resp.channels.end(), subChan) != resp.channels.end()) {
15300+
toNotify.emplace_back(sub.callback, resp);
15301+
break;
15302+
}
1525515303
}
1525615304
}
1525715305
}
15306+
15307+
for (const auto& [cb, r] : toNotify) {
15308+
if (cb) cb(r);
15309+
}
1525815310
} catch (...) {}
1525915311
}
1526015312
};

‎src/SDK/Language/Cpp.php‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -14,6 +14,7 @@ class Cpp extends Language
1414
{
1515
private ?array $identifierOverridesCache = null;
1616

17+
// Parameters are iterated in spec order — std::format requires positional order match
1718
private function buildPathLine(array $method): string
1819
{
1920
$path = $method['path'];
@@ -858,7 +859,7 @@ public function getFilters(): array
858859
}
859860
}
860861

861-
// Kahn's algorithm: compute dependencies
862+
// DFS post-order traversal: compute dependencies
862863
$deps = []; // name -> set of names this depends on
863864
foreach ($byName as $name => $def) {
864865
$deps[$name] = [];

‎templates/cpp/include/base.hpp.twig‎

Lines changed: 7 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -167,6 +167,13 @@ public:
167167
explicit operator bool() const { return isOk(); }
168168
void operator*() const { value(); }
169169

170+
std::shared_ptr<AppwriteException> error() const {
171+
if (isOk()) throw AppwriteException("Result is Ok, no error available");
172+
try { std::rethrow_exception(*eptr_); }
173+
catch (const AppwriteException& e) { return e.clone(); }
174+
throw AppwriteException("Unknown error");
175+
}
176+
170177
private:
171178
Result() : eptr_(std::nullopt) {}
172179
explicit Result(std::exception_ptr eptr) : eptr_(std::move(eptr)) {}

‎templates/cpp/include/client.hpp.twig‎

Lines changed: 36 additions & 19 deletions
Original file line numberDiff line numberDiff line change
@@ -389,19 +389,24 @@ private:
389389
std::lock_guard<std::mutex> lock(cfg_mutex_);
390390
cfg_ = std::make_shared<const Config>(std::move(next));
391391
}
392-
392+
// Retry: idempotent methods (GET/PUT/DELETE/HEAD/OPTIONS) retry on network
393+
// failure, 429, and 5xx. POST/PATCH retry only on status_code==0 (request
394+
// never reached the server) to avoid duplicate side effects.
393395
static cpr::Response send(const Config& c, std::string_view m, std::string_view p, const auto& h, const auto& pms, bool no_redir = false) {
394396
int attempt = 0;
395397
while (true) {
396398
cpr::Session s;
397399
init(s, c, m, p, h, pms, no_redir);
398400
cpr::Response r = runSession(s, m);
399-
if (r.status_code == 0) {
400-
if (attempt < c.retryOptions.maxRetries) {
401-
attempt++;
402-
std::this_thread::sleep_for(c.retryOptions.retryDelay);
403-
continue;
404-
}
401+
402+
bool isRetryable = (r.status_code == 0 || r.status_code == 429 || (r.status_code >= 500 && r.status_code <= 504));
403+
bool isIdempotent = (m == "GET" || m == "PUT" || m == "DELETE" || m == "HEAD" || m == "OPTIONS");
404+
bool canRetry = isRetryable && (isIdempotent || (r.status_code == 0 && attempt == 0));
405+
406+
if (canRetry && attempt < c.retryOptions.maxRetries) {
407+
attempt++;
408+
std::this_thread::sleep_for(c.retryOptions.retryDelay);
409+
continue;
405410
}
406411
return r;
407412
}
@@ -507,24 +512,36 @@ private:
507512
if (!fileId.empty()) cur_h["x-appwrite-id"] = fileId;
508513
cur_h["Content-Range"] = "bytes " + std::to_string(off) + "-" + std::to_string(end - 1) + "/" + std::to_string(size);
509514

510-
cpr::Session s;
511-
init(s, *c, m, p, cur_h, pms, false, true);
515+
int attempt = 0;
516+
while (true) {
517+
cpr::Session s;
518+
init(s, *c, m, p, cur_h, pms, false, true);
512519

513-
cpr::Multipart multipart = prepareMultipart(pms);
514-
multipart.parts.emplace_back(fk, cpr::Buffer{chunk.begin(), chunk.end(), file.filename()});
520+
cpr::Multipart multipart = prepareMultipart(pms);
521+
multipart.parts.emplace_back(fk, cpr::Buffer{chunk.begin(), chunk.end(), file.filename()});
515522

516-
s.SetMultipart(multipart);
517-
auto resp = runSession(s, m);
518-
verify(resp);
523+
s.SetMultipart(multipart);
524+
auto resp = runSession(s, m);
525+
526+
bool isRetryable = (resp.status_code == 0 || resp.status_code == 429 || (resp.status_code >= 500 && resp.status_code <= 504));
527+
// POST/PATCH only retry on connection failure, exactly once.
528+
bool canRetry = isRetryable && (resp.status_code == 0 && attempt == 0);
529+
530+
if (canRetry && attempt < c->retryOptions.maxRetries) {
531+
attempt++;
532+
std::this_thread::sleep_for(c->retryOptions.retryDelay);
533+
continue;
534+
}
519535

520-
last = nlohmann::json::parse(resp.text);
521-
if (fileId.empty() && last.contains("$id")) fileId = last["$id"].get<std::string>();
536+
verify(resp);
537+
538+
last = nlohmann::json::parse(resp.text);
539+
if (fileId.empty() && last.contains("$id")) fileId = last["$id"].get<std::string>();
540+
break;
541+
}
522542
off = end;
523543
chunksUploaded++;
524544

525-
// Prevent hammering servers (specifically mock-server race conditions)
526-
std::this_thread::sleep_for(std::chrono::milliseconds(10));
527-
528545
if (cb) {
529546
cb(InputFile::Progress{
530547
.id = 0,

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