Rework book server and client.

examples/book_server/book_db.cc

@@ -0,0 +1,66 @@
+#include "book_db.h"
+
+#include <algorithm>
+
+const Book& BookDB::Get(const std::string& id) const {
+  auto it = Find(id);
+  return (it == books_.end() ? kNullBook : *it);
+}
+
+std::string BookDB::Add(const Book& book) {
+  std::string id = NewID();
+  books_.push_back({ id, book.title, book.price });
+  return id;
+}
+
+bool BookDB::Set(const Book& book) {
+  auto it = Find(book.id);
+  if (it != books_.end()) {
+    it->title = book.title;
+    it->price = book.price;
+    return true;
+  }
+  return false;
+}
+
+std::string BookDB::GetPhoto(const std::string& id) const {
+  auto it = Find(id);
+  return it != books_.end() ? it->photo : "";
+}
+
+bool BookDB::SetPhoto(const std::string& id, const std::string& photo) {
+  auto it = Find(id);
+  if (it != books_.end()) {
+    it->photo = photo;
+    return true;
+  }
+  return false;
+}
+
+bool BookDB::Delete(const std::string& id) {
+  auto it = Find(id);
+
+  if (it != books_.end()) {
+    books_.erase(it);
+    return true;
+  }
+
+  return false;
+}
+
+std::list<Book>::const_iterator BookDB::Find(const std::string& id) const {
+  return std::find_if(books_.begin(), books_.end(),
+                      [&id](const Book& book) { return book.id == id; });
+}
+
+std::list<Book>::iterator BookDB::Find(const std::string& id) {
+  return std::find_if(books_.begin(), books_.end(),
+                      [&id](Book& book) { return book.id == id; });
+}
+
+std::string BookDB::NewID() const {
+  static int s_id_counter = 0;
+
+  ++s_id_counter;
+  return std::to_string(s_id_counter);
+}