diff options
Diffstat (limited to 'client-lib/AFBClient.cpp')
| -rw-r--r-- | client-lib/AFBClient.cpp | 461 |
1 files changed, 461 insertions, 0 deletions
diff --git a/client-lib/AFBClient.cpp b/client-lib/AFBClient.cpp new file mode 100644 index 0000000..1677509 --- /dev/null +++ b/client-lib/AFBClient.cpp @@ -0,0 +1,461 @@ +#include "AFBClient.h" + +#include <cassert> +#include <cctype> +#include <cerrno> +#include <cstdio> +#include <cstdlib> +#include <cstring> + +#include <atomic> +#include <map> +#include <mutex> +#include <set> + +#include <unistd.h> + +#include <systemd/sd-event.h> + +#include <json-c/json.h> + +extern "C" { +#include <afb/afb-ws-client.h> +#include <afb/afb-wsj1.h> +} + +#define UNUSED(x) (void)(x) + +// _ ___ _ +// ___| | __ _ ___ ___ |_ _|_ __ ___ _ __ | | +// / __| |/ _` / __/ __| | || '_ ` _ \| '_ \| | +// | (__| | (_| \__ \__ \ | || | | | | | |_) | | +// \___|_|\__,_|___/___/ |___|_| |_| |_| .__/|_| +// |_| +class AFBClient::Impl { + friend class AFBClient; + + // This is the AFBClient interface impl + int init(int port, char const *token); + int dispatch(); + + // WM API + int requestSurface(const char *label); + int activateSurface(const char *label); + int deactivateSurface(const char *label); + int endDraw(const char *label); + + void set_event_handler(enum EventType et, handler_fun func); + + Impl(); + ~Impl(); + + struct afb_wsj1 *wsj1; + struct sd_event *loop; + + std::set<std::string> labels; + std::map<EventType, handler_fun> handlers; + + int api_call(const char *verb, json_object *object, + const std::function<void(bool, json_object *)> &onReply); + void dispatch_internal(); + +public: + void event(char const *et, char const *label); +}; + +namespace { + +constexpr const int token_maxlen = 20; +constexpr const char *const wmAPI = "winman"; + +#ifdef NDEBUG +#define TRACE() +#define TRACEN(N) +#else +#define CONCAT_(X, Y) X##Y +#define CONCAT(X, Y) CONCAT_(X, Y) + +#define TRACE() \ + ScopeTrace __attribute__((unused)) CONCAT(trace_scope_, __LINE__)(__func__) +#define TRACEN(N) \ + ScopeTrace __attribute__((unused)) CONCAT(named_trace_scope_, __LINE__)(#N) + +struct ScopeTrace { + thread_local static int indent; + char const *f{}; + explicit ScopeTrace(char const *func) : f(func) { + fprintf(stderr, "%*s%s -->\n", 2 * indent++, "", this->f); + } + ~ScopeTrace() { fprintf(stderr, "%*s%s <--\n", 2 * --indent, "", this->f); } +}; +thread_local int ScopeTrace::indent = 0; +#endif + +/* called when wsj1 receives a method invocation */ +void onCall(void *closure, const char *api, const char *verb, + struct afb_wsj1_msg *msg) { + TRACE(); + UNUSED(closure); + UNUSED(verb); + UNUSED(api); + UNUSED(msg); +} + +/* called when wsj1 receives an event */ +void onEvent(void *closure, const char *event, afb_wsj1_msg *msg) { + TRACE(); + reinterpret_cast<AFBClient::Impl *>(closure)->event( + event, json_object_get_string( + json_object_object_get(afb_wsj1_msg_object_j(msg), "data"))); +} + +/* called when wsj1 hangsup */ +void onHangup(void *closure, afb_wsj1 *wsj1) { + TRACE(); + UNUSED(closure); + UNUSED(wsj1); + fputs("Hangup, the WindowManager vanished\n", stderr); + exit(1); // XXX: there should be something ... *better* here. +} + +constexpr struct afb_wsj1_itf itf = { + onHangup, onCall, onEvent, +}; + +// XXX: I am not sure this is the right thing to do though... +std::recursive_mutex dispatch_mutex; + +json_object *drawing_name_json_argument(char const *label) { + json_object *j = json_object_new_object(); + json_object_object_add(j, "drawing_name", json_object_new_string(label)); + return j; +} + +} // namespace + +// _ ___ _ _ _ +// ___| | __ _ ___ ___ |_ _|_ __ ___ _ __ | | (_)_ __ ___ _ __ | | +// / __| |/ _` / __/ __| | || '_ ` _ \| '_ \| | | | '_ ` _ \| '_ \| | +// | (__| | (_| \__ \__ \ | || | | | | | |_) | | | | | | | | | |_) | | +// \___|_|\__,_|___/___/ |___|_| |_| |_| .__/|_| |_|_| |_| |_| .__/|_| +// |_| |_| +AFBClient::Impl::Impl() : wsj1{}, loop{}, labels(), handlers() { TRACE(); } + +AFBClient::Impl::~Impl() { + TRACE(); + afb_wsj1_unref(wsj1); + sd_event_unref(loop); +} + +int AFBClient::Impl::init(int port, char const *token) { + TRACE(); + char *uribuf = nullptr; + int rc = -1; + + if (this->loop != nullptr && this->wsj1 != nullptr) { + fputs("AFBClient instance is already initialized!\n", stderr); + rc = -EALREADY; + goto fail; + } + + if ((token == nullptr) || strlen(token) > token_maxlen) { + fputs("Token is invalid\n", stderr); + rc = -EINVAL; + goto fail; + } + + for (char const *p = token; *p != 0; p++) { + if (isalnum(*p) == 0) { + fputs("Token is invalid\n", stderr); + rc = -EINVAL; + goto fail; + } + } + + if (port < 1 || port > 0xffff) { + fputs("Port is invalid\n", stderr); + rc = -EINVAL; + goto fail; + } + + /* get the default event loop */ + rc = sd_event_default(&this->loop); + if (rc < 0) { + fprintf(stderr, "Connection to default event loop failed: %s\n", + strerror(-rc)); + goto fail; + } + + asprintf(&uribuf, "ws://localhost:%d/api?token=%s", port, token); + + /* connect the websocket wsj1 to the uri given by the first argument */ + this->wsj1 = afb_ws_client_connect_wsj1( + this->loop, uribuf, const_cast<struct afb_wsj1_itf *>(&itf), this); + if (this->wsj1 == nullptr) { + sd_event_unref(this->loop); + this->loop = nullptr; + fprintf(stderr, "Connection to %s failed: %m\n", uribuf); + rc = -errno; + goto fail; + } + + return 0; + +fail: + return rc; +} + +int AFBClient::Impl::dispatch() { + std::lock_guard<std::recursive_mutex> guard(dispatch_mutex); + return sd_event_run(this->loop, 1); +} + +int AFBClient::Impl::requestSurface(const char *label) { + TRACE(); + + if (this->labels.find(label) != this->labels.end()) { + fputs("Surface label already known!\n", stderr); + return -EINVAL; + } + + json_object *j = drawing_name_json_argument(label); + + int rc = -1; + /* send the request */ + int rc2 = + this->api_call("request_surface", j, [&rc](bool ok, json_object *j) { + if (ok) { + int id = + json_object_get_int(json_object_object_get(j, "response")); + char *buf; + asprintf(&buf, "%d", id); + printf("setenv(\"QT_IVI_SURFACE_ID\", %s, 1)\n", buf); + if (setenv("QT_IVI_SURFACE_ID", buf, 1) != 0) { + fprintf(stderr, "putenv failed: %m\n"); + rc = -errno; + } else { + rc = 0; // Single point of success + } + } else { + fprintf(stderr, "Could not get surface ID from WM: %s\n", + j != nullptr ? json_object_to_json_string_ext( + j, JSON_C_TO_STRING_PRETTY) + : "no-info"); + rc = -EINVAL; + } + }); + + if (rc2 < 0) { + rc = rc2; + } + + if (rc >= 0) { + this->labels.insert(this->labels.end(), label); + } + + return rc; +} + +int AFBClient::Impl::activateSurface(const char *label) { + TRACE(); + json_object *j = drawing_name_json_argument(label); + return this->api_call("activate_surface", j, [](bool ok, json_object *j) { + if (!ok) { + fprintf(stderr, "API Call activate_surface() failed: %s\n", + j != nullptr ? json_object_to_json_string_ext( + j, JSON_C_TO_STRING_PRETTY) + : "no-info"); + } + }); +} + +int AFBClient::Impl::deactivateSurface(const char *label) { + TRACE(); + json_object *j = drawing_name_json_argument(label); + return this->api_call("deactivate_surface", j, [](bool ok, json_object *j) { + if (!ok) { + fprintf(stderr, "API Call deactivate_surface() failed: %s\n", + j != nullptr ? json_object_to_json_string_ext( + j, JSON_C_TO_STRING_PRETTY) + : "no-info"); + } + }); +} + +int AFBClient::Impl::endDraw(const char *label) { + TRACE(); + json_object *j = drawing_name_json_argument(label); + return this->api_call("enddraw", j, [](bool ok, json_object *j) { + if (!ok) { + fprintf(stderr, "API Call endDraw() failed: %s\n", + j != nullptr ? json_object_to_json_string_ext( + j, JSON_C_TO_STRING_PRETTY) + : "no-info"); + } + }); +} + +void AFBClient::Impl::set_event_handler( + enum EventType et, std::function<void(char const *)> func) { + TRACE(); + + if (et >= 1 && et <= 6) { // Yeah ... just go with it! + this->handlers[et] = std::move(func); + } +} + +namespace { +std::pair<bool, AFBClient::EventType> make_event_type(char const *et) { + // Event have the form "$API/$EVENT", just try to find the first / and + // get on with it. + char const *et2 = strchr(et, '/'); + if (et2 != nullptr) { + et = et2 + 1; + } + +#define ET(N, A) \ + do { \ + if (strcasecmp(et, N) == 0) \ + return std::pair<bool, AFBClient::EventType>( \ + true, CONCAT(AFBClient::Event_, A)); \ + } while (false) + + ET("activated", Active); + ET("deactivated", Inactive); + ET("visible", Visible); + ET("invisible", Invisible); + ET("syncdraw", SyncDraw); + ET("flushdraw", FlushDraw); +#undef ET + + return std::pair<bool, AFBClient::EventType>(false, + AFBClient::Event_Active); +} +} // namespace + +/// object will be json_object_put +int AFBClient::Impl::api_call( + const char *verb, json_object *object, + const std::function<void(bool, json_object *)> &onReply) { + TRACE(); + + // We need to wrap the actual onReply call once in order to + // *look* like a normal functions pointer (std::functions<> + // with captures cannot convert to function pointers). + // Alternatively we could setup a local struct and use it as + // closure, but I think it is cleaner this way. + int call_rc = 0; + std::atomic<bool> returned{}; + returned.store(false, std::memory_order_relaxed); + std::function<void(bool, json_object *)> wrappedOnReply = + [&returned, &call_rc, &onReply](bool ok, json_object *j) { + TRACEN(wrappedOnReply); + call_rc = ok ? 0 : -EINVAL; + // We know it failed, but there may be an explanation in the + // json object. + { + TRACEN(onReply); + onReply(ok, j); + } + returned.store(true, std::memory_order_release); + }; + + // make the actual call, use wrappedOnReply as closure + int rc = afb_wsj1_call_j( + this->wsj1, wmAPI, verb, object, + [](void *closure, afb_wsj1_msg *msg) { + TRACEN(callClosure); + auto *onReply = + reinterpret_cast<std::function<void(bool, json_object *)> *>( + closure); + (*onReply)(!(afb_wsj1_msg_is_reply_ok(msg) == 0), + afb_wsj1_msg_object_j(msg)); + }, + &wrappedOnReply); + + if (rc < 0) { + fprintf( + stderr, "calling %s/%s(%s) failed: %m\n", wmAPI, verb, + json_object_to_json_string_ext(object, JSON_C_TO_STRING_PRETTY)); + // Call the reply handler regardless with a NULL json_object* + onReply(false, nullptr); + } else { + // We need to dispatch until "returned" got set, this is necessary + // if events get triggered by the call (and would be dispatched before + // the actual call-reply). + while (!returned.load(std::memory_order_consume)) { + std::lock_guard<std::recursive_mutex> guard(dispatch_mutex); + if (!returned.load(std::memory_order_consume)) { + this->dispatch_internal(); + } + } + + // return the actual API call result + rc = call_rc; + } + + return rc; +} + +void AFBClient::Impl::dispatch_internal() { + std::lock_guard<std::recursive_mutex> guard(dispatch_mutex); + TRACE(); + sd_event_run(this->loop, -1); +} + +void AFBClient::Impl::event(char const *et, char const *label) { + TRACE(); + auto oet = make_event_type(et); + if (!oet.first) { + fprintf(stderr, "Unknown event type string '%s'\n", et); + return; + } + + auto i = this->handlers.find(oet.second); + if (i != this->handlers.end()) { + if (this->labels.find(label) != this->labels.end()) { + i->second(label); + } + } +} + +// _ _ _____ ____ ____ _ _ _ +// ___| | __ _ ___ ___ / \ | ___| __ ) / ___| (_) ___ _ __ | |_ +// / __| |/ _` / __/ __| / _ \ | |_ | _ \| | | | |/ _ \ '_ \| __| +// | (__| | (_| \__ \__ \ / ___ \| _| | |_) | |___| | | __/ | | | |_ +// \___|_|\__,_|___/___/ /_/ \_\_| |____/ \____|_|_|\___|_| |_|\__| +// +int AFBClient::init(int port, char const *token) { + return this->d->init(port, token); +} + +int AFBClient::dispatch() { return this->d->dispatch(); } + +int AFBClient::requestSurface(const char *label) { + return this->d->requestSurface(label); +} + +int AFBClient::activateSurface(const char *label) { + return this->d->activateSurface(label); +} + +int AFBClient::deactivateSurface(const char *label) { + return this->d->deactivateSurface(label); +} + +int AFBClient::endDraw(const char *label) { return this->d->endDraw(label); } + +void AFBClient::set_event_handler(enum EventType et, + std::function<void(char const *label)> f) { + return this->d->set_event_handler(et, std::move(f)); +} + +AFBClient &AFBClient::instance() { + TRACE(); + static AFBClient obj; + return obj; +} + +AFBClient::AFBClient() : d(new Impl) {} + +AFBClient::~AFBClient() { delete d; } |