Regen Blockchain Exercise #3

import github.com/google/uuid

// msgServer is the server-side (blockchain node) implementation of
// a blockchain transaction handler.
type msgServer struct{
  // store has access to the blockchain state, which is a key/value store
  // (which will be merkelized) persisted on disk.
  store *Store
}

// CreateBlogPost takes the request from the tx, and stores a new blog post
// in state.
func (s *msgServer) CreateBlogPost(req CreateBlogPostRequest) (CreateBlogPostResponse, error) {
    // Create a new blog post struct using the inputs from the tx.
    blogId := uuid.New()
    blogPost := BlogPost{Id: blogId, Title: req.Title}
  
    // Persist the blog post to the store.
    // Set the key/value in store.
    err := s.store.Set([]byte(uuid), proto.Marshal(&blogPost))
    if err != nil {
        return CreateBlogPostResponse{}, err
    }

    return CreateBlogPostResponse{Id: blogId}, nil
}

type CreateBlogPostRequest struct {
    Title string
}
type CreateBlogPostResponse struct {
    Id string
}
type BlogPost struct {
    proto.Message
    Id string
    Title string
}