feat: add methods for first and last block [arduino] (#185)

Author: sleepdefic1t

src/api/blocks/blocks.cpp

@@ -19,6 +19,18 @@ std::string Blocks::get(const char* blockId) {
 
 /**/
 
+std::string Blocks::first() {
+  return http_->get(paths::Blocks::first(this->host_).c_str());
+}
+
+/**/
+
+std::string Blocks::last() {
+  return http_->get(paths::Blocks::last(this->host_).c_str());
+}
+
+/**/
+
 std::string Blocks::all(const char* const query) {
   return http_->get(paths::Blocks::all(this->host_, query).c_str());
 }

src/api/blocks/blocks.h

@@ -24,6 +24,8 @@ class IBlocks : public Base {
  public:
   virtual ~IBlocks() {}
   virtual std::string get(const char* const blockId) = 0;
+  virtual std::string first() = 0;
+  virtual std::string last() = 0;
   virtual std::string all(const char* const query) = 0;
   virtual std::string transactions(const char* const blockId) = 0;
   virtual std::string search(const std::map<std::string, std::string>& bodyParameters, const char* const query) = 0;
@@ -39,6 +41,8 @@ class Blocks : public IBlocks {
   Blocks(Host& host, IHTTP& http) : IBlocks(host, http) {}
 
   std::string get(const char* const blockId) override;
+  std::string first() override;
+  std::string last() override;
   std::string all(const char* const query) override;
   std::string transactions(const char* const blockId) override;
   std::string search(const std::map<std::string, std::string>& bodyParameters, const char* const query) override;

src/api/paths.cpp

@@ -59,6 +59,28 @@ std::string Blocks::get(Host& newHost, const char* blockId) {
 
 ////////////////////////////////////////////////////////////////////////////////
 
+std::string Blocks::first(Host& newHost) {
+  std::string url;
+  url.reserve(URL_MAX_LEN);
+  url += newHost.toString().c_str();
+  url += Blocks::base();
+  url += "/first";
+  return url;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+std::string Blocks::last(Host& newHost) {
+  std::string url;
+  url.reserve(URL_MAX_LEN);
+  url += newHost.toString().c_str();
+  url += Blocks::base();
+  url += "/last";
+  return url;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
 std::string Blocks::all(Host& newHost, const char* const query) {
   std::string url;
   url.reserve(URL_MAX_LEN);

src/api/paths.h

@@ -38,6 +38,8 @@ struct Blockchain {
 struct Blocks {  // NOLINT
   static std::string base();
   static std::string get(Host& newHost, const char* const blockId);
+  static std::string first(Host& newHost);
+  static std::string last(Host& newHost);
   static std::string all(Host& newHost, const char* const query = DEFAULT_QUERY);
   static std::string transactions(Host& newHost, const char* const blockId);
   static std::pair<std::string, std::string> search(Host& newHost,