Uploading the main structure

node_modules/@parcel/watcher/src/binding.cc

@@ -0,0 +1,268 @@
+#include <unordered_set>
+#include <node_api.h>
+#include "wasm/include.h"
+#include <napi.h>
+#include "Glob.hh"
+#include "Event.hh"
+#include "Backend.hh"
+#include "Watcher.hh"
+#include "PromiseRunner.hh"
+
+using namespace Napi;
+
+std::unordered_set<std::string> getIgnorePaths(Env env, Value opts) {
+  std::unordered_set<std::string> result;
+
+  if (opts.IsObject()) {
+    Value v = opts.As<Object>().Get(String::New(env, "ignorePaths"));
+    if (v.IsArray()) {
+      Array items = v.As<Array>();
+      for (size_t i = 0; i < items.Length(); i++) {
+        Value item = items.Get(Number::New(env, i));
+        if (item.IsString()) {
+          result.insert(std::string(item.As<String>().Utf8Value().c_str()));
+        }
+      }
+    }
+  }
+
+  return result;
+}
+
+std::unordered_set<Glob> getIgnoreGlobs(Env env, Value opts) {
+  std::unordered_set<Glob> result;
+
+  if (opts.IsObject()) {
+    Value v = opts.As<Object>().Get(String::New(env, "ignoreGlobs"));
+    if (v.IsArray()) {
+      Array items = v.As<Array>();
+      for (size_t i = 0; i < items.Length(); i++) {
+        Value item = items.Get(Number::New(env, i));
+        if (item.IsString()) {
+          auto key = item.As<String>().Utf8Value();
+          try {
+            result.emplace(key);
+          } catch (const std::regex_error& e) {
+            Error::New(env, e.what()).ThrowAsJavaScriptException();
+          }
+        }
+      }
+    }
+  }
+
+  return result;
+}
+
+std::shared_ptr<Backend> getBackend(Env env, Value opts) {
+  Value b = opts.As<Object>().Get(String::New(env, "backend"));
+  std::string backendName;
+  if (b.IsString()) {
+    backendName = std::string(b.As<String>().Utf8Value().c_str());
+  }
+
+  return Backend::getShared(backendName);
+}
+
+class WriteSnapshotRunner : public PromiseRunner {
+public:
+  WriteSnapshotRunner(Env env, Value dir, Value snap, Value opts)
+    : PromiseRunner(env),
+      snapshotPath(std::string(snap.As<String>().Utf8Value().c_str())) {
+    watcher = Watcher::getShared(
+      std::string(dir.As<String>().Utf8Value().c_str()),
+      getIgnorePaths(env, opts),
+      getIgnoreGlobs(env, opts)
+    );
+
+    backend = getBackend(env, opts);
+  }
+
+  ~WriteSnapshotRunner() {
+    watcher->unref();
+    backend->unref();
+  }
+private:
+  std::shared_ptr<Backend> backend;
+  WatcherRef watcher;
+  std::string snapshotPath;
+
+  void execute() override {
+    backend->writeSnapshot(watcher, &snapshotPath);
+  }
+};
+
+class GetEventsSinceRunner : public PromiseRunner {
+public:
+  GetEventsSinceRunner(Env env, Value dir, Value snap, Value opts)
+    : PromiseRunner(env),
+      snapshotPath(std::string(snap.As<String>().Utf8Value().c_str())) {
+    watcher = std::make_shared<Watcher>(
+      std::string(dir.As<String>().Utf8Value().c_str()),
+      getIgnorePaths(env, opts),
+      getIgnoreGlobs(env, opts)
+    );
+
+    backend = getBackend(env, opts);
+  }
+
+  ~GetEventsSinceRunner() {
+    watcher->unref();
+    backend->unref();
+  }
+private:
+  std::shared_ptr<Backend> backend;
+  WatcherRef watcher;
+  std::string snapshotPath;
+
+  void execute() override {
+    backend->getEventsSince(watcher, &snapshotPath);
+    if (watcher->mEvents.hasError()) {
+      throw std::runtime_error(watcher->mEvents.getError());
+    }
+  }
+
+  Value getResult() override {
+    std::vector<Event> events = watcher->mEvents.getEvents();
+    Array eventsArray = Array::New(env, events.size());
+    size_t i = 0;
+    for (auto it = events.begin(); it != events.end(); it++) {
+      eventsArray.Set(i++, it->toJS(env));
+    }
+    return eventsArray;
+  }
+};
+
+template<class Runner>
+Value queueSnapshotWork(const CallbackInfo& info) {
+  Env env = info.Env();
+  if (info.Length() < 1 || !info[0].IsString()) {
+    TypeError::New(env, "Expected a string").ThrowAsJavaScriptException();
+    return env.Null();
+  }
+
+  if (info.Length() < 2 || !info[1].IsString()) {
+    TypeError::New(env, "Expected a string").ThrowAsJavaScriptException();
+    return env.Null();
+  }
+
+  if (info.Length() >= 3 && !info[2].IsObject()) {
+    TypeError::New(env, "Expected an object").ThrowAsJavaScriptException();
+    return env.Null();
+  }
+
+  Runner *runner = new Runner(info.Env(), info[0], info[1], info[2]);
+  return runner->queue();
+}
+
+Value writeSnapshot(const CallbackInfo& info) {
+  return queueSnapshotWork<WriteSnapshotRunner>(info);
+}
+
+Value getEventsSince(const CallbackInfo& info) {
+  return queueSnapshotWork<GetEventsSinceRunner>(info);
+}
+
+class SubscribeRunner : public PromiseRunner {
+public:
+  SubscribeRunner(Env env, Value dir, Value fn, Value opts) : PromiseRunner(env) {
+    watcher = Watcher::getShared(
+      std::string(dir.As<String>().Utf8Value().c_str()),
+      getIgnorePaths(env, opts),
+      getIgnoreGlobs(env, opts)
+    );
+
+    backend = getBackend(env, opts);
+    watcher->watch(fn.As<Function>());
+  }
+
+private:
+  WatcherRef watcher;
+  std::shared_ptr<Backend> backend;
+  FunctionReference callback;
+
+  void execute() override {
+    try {
+      backend->watch(watcher);
+    } catch (std::exception &err) {
+      watcher->destroy();
+      throw;
+    }
+  }
+};
+
+class UnsubscribeRunner : public PromiseRunner {
+public:
+  UnsubscribeRunner(Env env, Value dir, Value fn, Value opts) : PromiseRunner(env) {
+    watcher = Watcher::getShared(
+      std::string(dir.As<String>().Utf8Value().c_str()),
+      getIgnorePaths(env, opts),
+      getIgnoreGlobs(env, opts)
+    );
+
+    backend = getBackend(env, opts);
+    shouldUnwatch = watcher->unwatch(fn.As<Function>());
+  }
+
+private:
+  WatcherRef watcher;
+  std::shared_ptr<Backend> backend;
+  bool shouldUnwatch;
+
+  void execute() override {
+    if (shouldUnwatch) {
+      backend->unwatch(watcher);
+    }
+  }
+};
+
+template<class Runner>
+Value queueSubscriptionWork(const CallbackInfo& info) {
+  Env env = info.Env();
+  if (info.Length() < 1 || !info[0].IsString()) {
+    TypeError::New(env, "Expected a string").ThrowAsJavaScriptException();
+    return env.Null();
+  }
+
+  if (info.Length() < 2 || !info[1].IsFunction()) {
+    TypeError::New(env, "Expected a function").ThrowAsJavaScriptException();
+    return env.Null();
+  }
+
+  if (info.Length() >= 3 && !info[2].IsObject()) {
+    TypeError::New(env, "Expected an object").ThrowAsJavaScriptException();
+    return env.Null();
+  }
+
+  Runner *runner = new Runner(info.Env(), info[0], info[1], info[2]);
+  return runner->queue();
+}
+
+Value subscribe(const CallbackInfo& info) {
+  return queueSubscriptionWork<SubscribeRunner>(info);
+}
+
+Value unsubscribe(const CallbackInfo& info) {
+  return queueSubscriptionWork<UnsubscribeRunner>(info);
+}
+
+Object Init(Env env, Object exports) {
+  exports.Set(
+    String::New(env, "writeSnapshot"),
+    Function::New(env, writeSnapshot)
+  );
+  exports.Set(
+    String::New(env, "getEventsSince"),
+    Function::New(env, getEventsSince)
+  );
+  exports.Set(
+    String::New(env, "subscribe"),
+    Function::New(env, subscribe)
+  );
+  exports.Set(
+    String::New(env, "unsubscribe"),
+    Function::New(env, unsubscribe)
+  );
+  return exports;
+}
+
+NODE_API_MODULE(watcher, Init)