added update method (PATCH), return error object

src/Firebase.cpp

@@ -92,7 +92,7 @@ FirebaseCall::FirebaseCall(const std::string& host, const std::string& auth,
                            const char* method, const std::string& path,
                            const std::string& data, FirebaseHttpClient* http) : http_(http) {
   std::string path_with_auth = makeFirebaseURL(path, auth);
-  if ((method == "STREAM") && (path == http->getStreamingPath())){
+  if (strcmp(method, "STREAM") == 0 && (path == http->getStreamingPath())){
     // already streaming requested path.
     return;
   }
@@ -176,6 +176,17 @@ FirebaseSet::FirebaseSet(const std::string& host, const std::string& auth,
   }
 }
 
+// FirebaseUpdate
+FirebaseUpdate::FirebaseUpdate(const std::string& host, const std::string& auth,
+       const std::string& path, const std::string& value,
+       FirebaseHttpClient* http)
+  : FirebaseCall(host, auth, "PATCH", path, value, http) {
+  if (!error()) {
+    // TODO: parse json
+    json_ = response();
+  }
+}
+
 // FirebasePush
 FirebasePush::FirebasePush(const std::string& host, const std::string& auth,
                            const std::string& path, const std::string& value,

src/Firebase.h

@@ -29,6 +29,7 @@
 
 class FirebaseGet;
 class FirebaseSet;
+class FirebaseUpdate;
 class FirebasePush;
 class FirebaseRemove;
 class FirebaseStream;
@@ -48,6 +49,10 @@ class Firebase {
   FirebaseSet set(const std::string& path, const std::string& json);
   virtual std::unique_ptr<FirebaseSet> setPtr(const std::string& path, const std::string& json);
 
+  // Update json encoded `value` at `path`.
+  FirebaseSet update(const std::string& path, const std::string& json);
+  virtual std::unique_ptr<FirebaseSet> updatePtr(const std::string& path, const std::string& json);
+
   // Add new json encoded `value` to list at `path`.
   FirebasePush push(const std::string& path, const std::string& json);
   virtual std::unique_ptr<FirebasePush> pushPtr(const std::string& path, const std::string& json);
@@ -117,6 +122,17 @@ class FirebaseSet: public FirebaseCall {
   std::string json_;
 };
 
+class FirebaseUpdate: public FirebaseCall {
+ public:
+  FirebaseUpdate() {}
+  FirebaseUpdate(const std::string& host, const std::string& auth,
+              const std::string& path, const std::string& value, FirebaseHttpClient* http = NULL);
+
+
+ private:
+  std::string json_;
+};
+
 class FirebasePush : public FirebaseCall {
  public:
   FirebasePush() {}

src/FirebaseArduino.cpp

@@ -75,6 +75,13 @@ void FirebaseArduino::set(const String& path, const JsonVariant& value) {
   error_ = set.error();
 }
 
+void FirebaseArduino::update(const String& path, const JsonVariant& value) {
+  String buf;
+  value.printTo(buf);
+  auto set = FirebaseUpdate(host_, auth_, path.c_str(), buf.c_str(), http_.get());
+  error_ = set.error();
+}
+
 FirebaseObject FirebaseArduino::get(const String& path) {
   auto get = FirebaseGet(host_, auth_, path.c_str(), http_.get());
   error_ = get.error();
@@ -159,4 +166,8 @@ const String& FirebaseArduino::error() {
   return error_.message().c_str();
 }
 
+const FirebaseError& FirebaseArduino::errorObj() {
+  return error_;
+}
+
 FirebaseArduino Firebase;

src/FirebaseArduino.h

@@ -134,6 +134,14 @@ class FirebaseArduino {
    */
   void set(const String& path, const JsonVariant& value);
 
+  /**
+   * Writes the JSON data to the node located at path.
+   * Equivalent to the REST API's PATCH.
+   * You should check success() after calling.
+   * \param path The path inside of your db to the node you wish to update.
+   * \param value JSON data that you wish to write.
+   */
+  void update(const String& path, const JsonVariant& value);
 
   /**
    * Gets the integer value located at path.
@@ -222,6 +230,7 @@ class FirebaseArduino {
    * \return Error message from last command if failed() is true.
    */
   const String& error();
+  const FirebaseError &errorObj();
  private:
   std::string host_;
   std::string auth_;