使用Motoko实现计数器

最新推荐文章于 2022-03-14 17:18:13 发布

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本文介绍了一个名为actorCounter的组件，它提供了一个计数器功能，包括获取值、设置值和递增，以及HTTP请求响应，用于实时更新HTML页面。它展示了如何在信息技术中使用异步操作和流处理策略。

import Nat "mo:base/Nat";
import Text "mo:base/Text";
actor Counter {

  stable var counter = 0;

  // Get the value of the counter.
  public query func get() : async Nat {
    return counter;
  };

  // Set the value of the counter.
  public func set(n : Nat) : async () {
    counter := n;
  };

  // Increment the value of the counter.
  public func inc() : async () {
    counter += 1;
  };

   public type Key = Text;
  public type Path = Text;
  public type ChunkId = Nat;
  public type SetAssetContentArguments = {
    key : Key;
    sha256 : ?[Nat8];
    chunk_ids : [ChunkId];
    content_encoding : Text;
  };
  public type StreamingCallbackHttpResponse = {
    token : ?StreamingCallbackToken;
    body : [Nat8];
  };
  public type StreamingCallbackToken = {
    key : Text;
    sha256 : ?[Nat8];
    index : Nat;
    content_encoding : Text;
  };
  public type StreamingStrategy = {
    #Callback : {
      token : StreamingCallbackToken;
      callback : shared query StreamingCallbackToken -> async StreamingCallbackHttpResponse;
    };
  };
    public type HeaderField = (Text, Text);
    public type HttpRequest = {
        url : Text;
        method : Text;
        body : [Nat8];
        headers : [HeaderField];
    };
    public type HttpResponse = {
        body : Blob;
        headers : [HeaderField];
        streaming_strategy : ?StreamingStrategy;
        status_code : Nat16;
    };

    public shared query func http_request(request: HttpRequest): async HttpResponse {
        {
            body = Text.encodeUtf8("<html><body><h1>" # Nat.toText(counter) # "</h1></body></html>");
            headers = [];
            streaming_strategy = null;
            status_code = 200;
        }
    };
};