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First blog system

First blog system

1. What is Rooch

Rooch (opens in a new tab) is a fast, modular, secure, developer-friendly infrastructure solution for building Web3-native applications.

Rooch released the first version on June 28, 2023, the version name is Sprouting, and the version number is v0.1.

2. Install Rooch

2.1 Download

Prebuilt binary tarballs and corresponding source tarballs can be found on Rooch's GitHub releases page (opens in a new tab). If you want to experience the Git version, you can refer to this page to compile and install Rooch (opens in a new tab). The following guides you to install the Release version of Rooch.

wget https://github.com/rooch-network/rooch/releases/download/v0.1/rooch-ubuntu-latest.zip

Note: Please choose the version corresponding to your own system. I will use the Linux version to demonstrate here.

2.2 Decompress

unzip rooch-ubuntu-latest.zip

The decompressed files are stored in the rooch-artifacts directory, and rooch is our precompiled binary program.

rooch-artifacts
├── README.md
└── rooch

2.3 Run

Go to the unzipped folder rooch-artifacts and test if the program works.

cd rooch-artifacts
./rooch

If you can see the output below, it means everything is working fine.

[joe@mx rooch]$ rooch
Usage: rooch <COMMAND>
 
Commands:
  account      Tool for interacting with accounts
  init         Tool for init with rooch
  move         CLI frontend for the Move compiler and VM
  server       Start Rooch network
  state        Get states by accessPath
  object       Get object by object id
  resource     Get account resource by tag
  transaction  Tool for interacting with transaction
  event        Tool for interacting with event
  abi
  env          Interface for managing multiple environments
  session-key  Session key Commands
  rpc
  help         Print this message or the help of the given subcommand(s)
 
Options:
  -h, --help     Print help
  -V, --version  Print version

2.4 Add to PATH

For the convenience of subsequent use, it is recommended to put rooch into a path that can be retrieved by the system environment variable PATH, or export the current decompressed directory to PATH through export.

  • Method 1, copy the rooch program to the /usr/local/bin directory (recommended)
sudo cp rooch /usr/local/bin
  • Method 2, export path (not recommended)

Use the following small script to add rooch to the Bash shell's PATH.

echo "export PATH=\$PATH:$PWD" >> ~/.bashrc
source ~/.bashrc

3. Initialize Rooch configuration

rooch init

After running the command to initialize the configuration, a .rooch directory will be created in the user's home directory ($HOME), and the relevant configuration information of the Rooch account will be generated.

4. Create a new Rooch project

This part will guide you how to create a blog contract application on Rooch, and realize the basic CRUD functions.

4.1 Create a Move project

Use the rooch integration's move new command to create a blog application called simple_blog.

rooch move new simple_blog

The generated Move project contains a configuration file Move.toml and a sources directory for storing Move source code.

simple_blog
├── Move.toml
└── sources

We can take a quick look at what the Move.toml file contains.

[package]
name = "simple_blog"
version = "0.0.1"
 
[dependencies]
MoveStdlib = { git = "https://github.com/rooch-network/rooch.git", subdir = "frameworks/move-stdlib", rev = "main" }
MoveosStdlib = { git = "https://github.com/rooch-network/rooch.git", subdir = "frameworks/moveos-stdlib", rev = "main" }
RoochFramework = { git = "https://github.com/rooch-network/rooch.git", subdir = "frameworks/rooch-framework", rev = "main" }
 
[addresses]
simple_blog = "_"
std = "0x1"
moveos_std = "0x2"
rooch_framework = "0x3"
  • There are three tables in the TOML file: package, dependencies and addresses, which store some meta information required by the project.
  • The package table is used to store some description information of the project, which contains two key-value pairs name and version to describe the project name and version number of the project.
  • The dependencies table is used to store the metadata that the project depends on.
  • The addresses table is used to store the address of the project and the addresses of the modules that the project depends on. The first address is the address generated in $HOME/.rooch/rooch_config/rooch.yaml when initializing the Rooch configuration.

In order to facilitate the deployment of other developers, we replace the address of simple_blog with _, and then specify it through --named--addresses when deploying.

4.2 Quick experience

In this section, I will guide you to write a blog initialization function and run it in Rooch to experience the basic process of writing -> compiling -> publishing -> calling the contract.

We create a new simple_blog.move file in the sources directory and start writing our blog contract.

4.2.1 Define the structure of the blog

Our blogging system allows everyone to create their own blog and keep their own list of blogs. First, we define a blog structure:

struct MyBlog has key, store {
    name: String,
    articles: vector<ObjectID>,
}

This structure contains two fields, one is the name of the blog, and the other is the list of blog posts. For the article list, we only save the ID of the article Object.

Then define a function to create a blog:

public fun create_blog(owner: &signer) {
    let articles = vector::empty();
    let myblog = MyBlog {
        name: string::utf8(b"MyBlog"),
        articles,
    };
    account::move_resource_to(owner, myblog);
}

public entry fun set_blog_name(owner: &signer, blog_name: String) {
    assert!(std::string::length(&blog_name) <= 200, ErrorDataTooLong);
    let owner_address = signer::address_of(owner);
    // if blog not exist, create it
    if (!account::exists_resource<MyBlog>(owner_address)) {
        create_blog(owner);
    };
    let myblog = account::borrow_mut_resource<MyBlog>(owner_address);
    myblog.name = blog_name;
}

Creating a blog is to initialize the MyBlog data structure and save MyBlog in the user's storage space. At the same time, an entry function for setting the blog name is provided. If the blog does not exist, the blog will be created first, and then the blog name will be set.

Then provide a contract initialization function, which will be automatically executed when the contract is published, and the blog will be automatically initialized for the user who publishes the contract.

/// This init function is called when the module is published
/// The owner is the address of the account that publishes the module
fun init(owner: &signer) {
    // auto create blog for module publisher
    create_blog(owner);
}

Then, provide a function to query the blog list and a function to add and delete articles. The whole code is as follows:

module simple_blog::simple_blog {
    use std::signer;
    use std::string::{Self, String};
    use std::vector;

    use moveos_std::account;
    use moveos_std::object::{Self, Object, ObjectID};

    use simple_blog::simple_article::{Self, Article};

    const ErrorDataTooLong: u64 = 1;
    const ErrorNotFound: u64 = 2;

    struct MyBlog has key, store {
        name: String,
        articles: vector<ObjectID>,
    }

    /// This init function is called when the module is published
    /// The owner is the address of the account that publishes the module
    fun init(owner: &signer) {
        // auto create blog for module publisher
        create_blog(owner);
    }

    public fun create_blog(owner: &signer) {
        let articles = vector::empty();
        let myblog = MyBlog {
            name: string::utf8(b"MyBlog"),
            articles,
        };
        account::move_resource_to(owner, myblog);
    }

    public entry fun set_blog_name(owner: &signer, blog_name: String) {
        assert!(std::string::length(&blog_name) <= 200, ErrorDataTooLong);
        let owner_address = signer::address_of(owner);
        // if blog not exist, create it
        if (!account::exists_resource<MyBlog>(owner_address)) {
            create_blog(owner);
        };
        let myblog = account::borrow_mut_resource<MyBlog>(owner_address);
        myblog.name = blog_name;
    }

    /// Get owner's blog's articles
    public fun get_blog_articles(owner_address: address): &vector<ObjectID> {
        let myblog = account::borrow_resource<MyBlog>(owner_address);
        &myblog.articles
    }

    fun add_article_to_myblog(owner: &signer, article_id: ObjectID) {
        let owner_address = signer::address_of(owner);
        // if blog not exist, create it
        if (!account::exists_resource<MyBlog>(owner_address)) {
            create_blog(owner);
        };
        let myblog = account::borrow_mut_resource<MyBlog>(owner_address);
        vector::push_back(&mut myblog.articles, article_id);
    }

    public entry fun create_article(
        owner: signer,
        title: String,
        body: String,
    ) {
        let article_id = simple_article::create_article(&owner, title, body);
        add_article_to_myblog(&owner, article_id);
    }

    public entry fun update_article(
        article_obj: &mut Object<Article>,
        new_title: String,
        new_body: String,
    ) {
        simple_article::update_article(article_obj, new_title, new_body);
    }

    fun delete_article_from_myblog(owner: &signer, article_id: ObjectID) {
        let owner_address = signer::address_of(owner);
        let myblog = account::borrow_mut_resource<MyBlog>(owner_address);
        let (contains, index) = vector::index_of(&myblog.articles, &article_id);
        assert!(contains, ErrorNotFound);
        vector::remove(&mut myblog.articles, index);
    }

    public entry fun delete_article(
        owner: &signer,
        article_id: ObjectID,
    ) {
        delete_article_from_myblog(owner, article_id);
        let article_obj = object::take_object(owner, article_id);
        simple_article::delete_article(article_obj);
    }
}
  • module simple_blog::simple_blog is used to declare which module our contract belongs to. Its syntax is module address::module_name, and the logic (function) of the contract is written in curly braces {}.
  • The use statement imports the libraries we need to depend on when writing contracts.
  • const defines the constants used in the contract, usually used to define some error codes.
  • fun is a keyword used to define a function, usually the function of the function is defined here. For safety, such functions are prohibited from being called directly on the command line, and the calling logic needs to be encapsulated in the entry function.
  • entry fun is used to define the entry function, and the function modified by the entry modifier can be called directly on the command line like a script.

4.2.2 Compile the Move contract

Before publishing the contract, we need to compile our contract. Here, --named-addresses is used to specify the address of the simple_blog module as the default address on the current device.

rooch move build --named-addresses simple_blog=default

After compiling, if there are no errors, you will see the message of Success at the end.

INCLUDING DEPENDENCY MoveStdlib
INCLUDING DEPENDENCY MoveosStdlib
INCLUDING DEPENDENCY RoochFramework
BUILDING simple_blog
Success

At this time, there will be a build directory in the project folder, which stores the contract bytecode file generated by the Move compiler and the complete code of the contract.

4.2.3 Running the Rooch server

Let's open another terminal and run the following command, the Rooch server will start the Rooch container service locally to process and respond to the relevant behavior of the contract.

rooch server start

After starting the Rooch service, you will see these two messages at the end, indicating that the Rooch service has been started normally.

2023-07-03T15:44:33.315228Z  INFO rooch_rpc_server: JSON-RPC HTTP Server start listening 0.0.0.0:50051
2023-07-03T15:44:33.315256Z  INFO rooch_rpc_server: Available JSON-RPC methods : ["wallet_accounts", "eth_blockNumber", "eth_getBalance", "eth_gasPrice", "net_version", "eth_getTransactionCount", "eth_sendTransaction", "rooch_sendRawTransaction", "rooch_getAnnotatedStates", "eth_sendRawTransaction", "rooch_getTransactions", "rooch_executeRawTransaction", "rooch_getEventsByEventHandle", "rooch_getTransactionByHash", "rooch_executeViewFunction", "eth_getBlockByNumber", "rooch_getEvents", "eth_feeHistory", "eth_getTransactionByHash", "eth_getBlockByHash", "eth_getTransactionReceipt", "rooch_getTransactionInfosByOrder", "eth_estimateGas", "eth_chainId", "rooch_getTransactionInfosByHash", "wallet_sign", "rooch_getStates"]

Tip: When we operate the contract-related logic (function) in the previous terminal window, we can observe the output of this terminal window.

4.2.4 Publish the Move contract

rooch move publish --named-addresses simple_blog=default

You can confirm that the publish operation was successfully executed when you see output similar to this (status is executed):

{
  //...
  "execution_info": {
    //...
    "status": {
      "type": "executed"
    }
  },
  //...
}

You can also see the processing information of the response in the terminal running the Rooch service:

2023-07-03T16:02:11.691028Z  INFO connection{remote_addr=127.0.0.1:58770 conn_id=0}: jsonrpsee_server::server: Accepting new connection 1/100
2023-07-03T16:02:13.690733Z  INFO rooch_proposer::actor::proposer: [ProposeBlock] block_number: 0, batch_size: 1

4.2.5 Call the Move contract

At this point, our blog contract has been released to the chain, and the blog has been initialized under the default account. We can use the status query command to check the blog Resource under the account:

rooch state --access-path /resource/{ACCOUNT_ADDRESS}/{RESOURCE_TYPE}

Among them, {ACCOUNT_ADDRESS} is the account address, {RESOURCE_TYPE} is the resource type, here is {MODULE_ADDRESS}::simple_blog::MyBlog. Here {ACCOUNT_ADDRESS} and {MODULE_ADDRESS} are the default account addresses of my machine.

We can check the value corresponding to the active_address key in the $HOME/.rooch/rooch_config/rooch.yaml file, which is the default account address of the operation contract.

My address is 0x5078ae74bac281e65fc446b467a843b186904a1b2d435f367030fc755eef1081, and I will continue to use this address to demonstrate related operations.

So the command I actually execute here should be:

[joe@mx simple_blog]$ rooch state --access-path /resource/0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7/0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7::simple_blog::MyBlog

return result:

[
  {
    "value": "0x064d79426c6f6700",
    "value_type": "0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7::simple_blog::MyBlog",
    "decoded_value": {
      "abilities": 12,
      "type": "0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7::simple_blog::MyBlog",
      "value": {
        "articles": [],
        "name": "MyBlog"
      }
    },
    "display_fields": null
  }
]

It can be seen that MyBlog Resource already exists, the name is the default MyBlog, and the article list is empty.

Then we set the blog name through the set_blog_name function. The syntax for calling a contract entry function is:

rooch move run --function {ACCOUNT_ADDRESS}::{MODULE_NAME}::{FUNCTION_NAME} --sender-account {ACCOUNT_ADDRESS}

Run a function with the rooch move run command. --function Specify the function name, you need to pass a complete function name, that is, the_address_of_the_published_contract::module_name::function_name, in order to accurately identify the function that needs to be called. --sender-account specifies the address of the account that calls this function, that is, which account is used to call this function, and anyone can call the contract on the chain.

[joe@mx simple_blog]$ rooch move run --function 0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7::simple_blog::set_blog_name --sender-account default --args 'string:Rooch blog'

When this command is executed, a transaction will be sent to the chain, and the content of the transaction is to call the set_blog_name function in the blog contract.

After the execution is successful, run the previous status query command again, and view the blog Resource:

[joe@mx simple_blog]$ rooch state --access-path /resource/0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7/0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7::simple_blog::MyBlog
 
[
  {
    "value": "0x0a526f6f636820626c6f6700",
    "value_type": "0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7::simple_blog::MyBlog",
    "decoded_value": {
      "abilities": 12,
      "type": "0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7::simple_blog::MyBlog",
      "value": {
        "articles": [],
        "name": "Rooch blog"
      }
    },
    "display_fields": null
  }
]

As you can see, the blog name has been modified successfully. So far, we have experienced the zero-to-one installation in Rooch, initial configuration, project creation, writing contracts, compiling contracts, publishing contracts, and calling contracts.

4.3 Improve the blog contract

Next, we will continue to improve the blog contract and increase the function of CRUD blog posts.

4.3.1 Create blog post contract

We create another simple_article.move file in the sources directory, which stores the data type of the article and the definition of related events for CRUD operations on the article.

Define the article data type, and the article event type:

struct Article has key, store {
    version: u64,
    title: String,
    body: String,
}

struct ArticleCreatedEvent has copy, store, drop {
    id: ObjectID,
}

struct ArticleUpdatedEvent has copy, store, drop {
    id: ObjectID,
    version: u64,
}

struct ArticleDeletedEvent has copy, store, drop {
    id: ObjectID,
    version: u64,
}

The article data structure contains three fields, version is used to record the version number of the article, title is used to record the title of the article, and body is used to record the content of the article.

Define a function to create an article:

/// Create article
public fun create_article(
    owner: &signer,
    title: String,
    body: String,
): ObjectID {
    assert!(std::string::length(&title) <= 200, ErrorDataTooLong);
    assert!(std::string::length(&body) <= 2000, ErrorDataTooLong);

    let article = Article {
        version: 0,
        title,
        body,
    };
    let owner_addr = signer::address_of(owner);
    let article_obj = object::new(article);
    let id = object::id(&article_obj);
    let article_created_event = ArticleCreatedEvent {
        id,
    };

    event::emit(article_created_event);
    object::transfer(article_obj, owner_addr);
    id
}

In this function, first check whether the length of the article title and content exceeds the limit. Then create the article object, add the article object to the object store, and finally send the article creation event and return the ID of the article.

Then define the modification function:

/// Update article
public fun update_article(
    article_obj: &mut Object<Article>,
    new_title: String,
    new_body: String,
) {
    assert!(std::string::length(&new_title) <= 200, ErrorDataTooLong);
    assert!(std::string::length(&new_body) <= 2000, ErrorDataTooLong);

    let id = object::id(article_obj);
    let article = object::borrow_mut(article_obj);
    article.version = article.version + 1;
    article.title = new_title;
    article.body = new_body;

    let article_update_event = ArticleUpdatedEvent {
        id,
        version: article.version,
    };
    event::emit(article_update_event);
}

In this function, first check whether the length of the new article title and content exceeds the limit. Then get the article object from the object store, check if the caller is the owner of the article, and throw an exception if not. Finally, update the version number, title and content of the article object, and send an article update event.

Then define the delete function:

/// Delete article
public fun delete_article(
    article_obj: Object<Article>,
) {
    let id = object::id(&article_obj);
    let article = object::remove(article_obj);

    let article_deleted_event = ArticleDeletedEvent {
        id,
        version: article.version,
    };
    event::emit(article_deleted_event);
    drop_article(article);
}

In this function, first delete the article object from the object store, check whether the caller is the owner of the article, and throw an exception if not. Finally send the article delete event and destroy the article object.

The complete contract code is as follows:

module simple_blog::simple_article {
    use std::signer;
    use std::string::String;

    use moveos_std::event;
    use moveos_std::object::{Self, Object, ObjectID};

    const ErrorDataTooLong: u64 = 1;
    const ErrorNotOwnerAccount: u64 = 2;

    //TODO should we allow Article to be transferred?
    struct Article has key, store {
        version: u64,
        title: String,
        body: String,
    }

    struct ArticleCreatedEvent has copy, store, drop {
        id: ObjectID,
    }

    struct ArticleUpdatedEvent has copy, store, drop {
        id: ObjectID,
        version: u64,
    }

    struct ArticleDeletedEvent has copy, store, drop {
        id: ObjectID,
        version: u64,
    }

    /// Create article
    public fun create_article(
        owner: &signer,
        title: String,
        body: String,
    ): ObjectID {
        assert!(std::string::length(&title) <= 200, ErrorDataTooLong);
        assert!(std::string::length(&body) <= 2000, ErrorDataTooLong);

        let article = Article {
            version: 0,
            title,
            body,
        };
        let owner_addr = signer::address_of(owner);
        let article_obj = object::new(article);
        let id = object::id(&article_obj);
        let article_created_event = ArticleCreatedEvent {
            id,
        };

        event::emit(article_created_event);
        object::transfer(article_obj, owner_addr);
        id
    }

    /// Update article
    public fun update_article(
        article_obj: &mut Object<Article>,
        new_title: String,
        new_body: String,
    ) {
        assert!(std::string::length(&new_title) <= 200, ErrorDataTooLong);
        assert!(std::string::length(&new_body) <= 2000, ErrorDataTooLong);

        let id = object::id(article_obj);
        let article = object::borrow_mut(article_obj);
        article.version = article.version + 1;
        article.title = new_title;
        article.body = new_body;

        let article_update_event = ArticleUpdatedEvent {
            id,
            version: article.version,
        };
        event::emit(article_update_event);
    }

    /// Delete article
    public fun delete_article(
        article_obj: Object<Article>,
    ) {
        let id = object::id(&article_obj);
        let article = object::remove(article_obj);

        let article_deleted_event = ArticleDeletedEvent {
            id,
            version: article.version,
        };
        event::emit(article_deleted_event);
        drop_article(article);
    }

    fun drop_article(article: Article) {
        let Article {
            version: _version,
            title: _title,
            body: _body,
        } = article;
    }

    /// Read function of article

    /// get article version
    public fun version(article: &Article): u64 {
        article.version
    }

    /// get article title
    public fun title(article: &Article): String {
        article.title
    }

    /// get article body
    public fun body(article: &Article): String {
        article.body
    }
}

The latest code can be found in the examples/simple_blog/sources/simple_blog.move (opens in a new tab)

4.3.2 Blog Contract Integration Article Contract

Next, we integrate the article contract in simple_blog.move and provide the entry function:

public entry fun create_article(
    owner: signer,
    title: String,
    body: String,
) {
    let article_id = simple_article::create_article(&owner, title, body);
    add_article_to_myblog(&owner, article_id);
}

public entry fun update_article(
    article_obj: &mut Object<Article>,
    new_title: String,
    new_body: String,
) {
    simple_article::update_article(article_obj, new_title, new_body);
}

public entry fun delete_article(
    owner: &signer,
    article_id: ObjectID,
) {
    delete_article_from_myblog(owner, article_id);
    let article_obj = object::take_object(owner, article_id);
    simple_article::delete_article(article_obj);
}

When creating and deleting articles, update the list of articles in the blog at the same time.

4.3.3 Creating blog posts

A test article can be created by submitting a transaction using the Rooch CLI like this:

rooch move run --function default::simple_blog::create_article --sender-account default --args 'string:Hello Rooch' --args "string:Unlocking infinite utility for the Bitcoin Economy"

--function specifies to execute the create_article function in the simple_blogmodule published at address 0x5078ae74bac281e65fc446b467a843b186904a1b2d435f367030fc755eef1081, that is, create a new blog post. --sender-account specifies who should submit this transaction. This function requires us to pass two parameters to it, specified by --args, the first is the title of the article, I named it Hello Rooch; the second is the content of the article, I wrote the slogan of Rooch: Unlocking infinite utility for the Bitcoin Economy.

The parameter passed is a string, which needs to be wrapped in quotation marks and specified through string:. There are single quotation marks in the content of the second parameter, so use double quotation marks to wrap it, otherwise you must use an escape character (\).

You can freely change the content of the first parameter (title) and the second parameter (body) after --args to create more articles.

4.3.4 Query Articles

Now, you can get the ObjectID of the created article by querying the event:

curl --location --request POST 'http://localhost:50051' \
--header 'Content-Type: application/json' \
--data-raw '{
 "id":101,
 "jsonrpc":"2.0",
 "method":"rooch_getEventsByEventHandle",
 "params":["0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7::simple_article::ArticleCreatedEvent", null, "1000", false, {"decode":true}]
}'

Since there are many output contents, you can add a pipeline operation ( | jq '.result.data[0].decoded_event_data.value.id') at the end of the above command to quickly filter out the ObjectID of the first article.

Tip: Before using the jp command (jq - commandline JSON processor), you may need to install it first.

The command after adding jp processing looks like this:

curl --location --request POST 'http://localhost:50051' --header 'Content-Type: application/json' --data-raw '{
 "id":101,
 "jsonrpc":"2.0",
 "method":"rooch_getEventsByEventHandle",
 "params":["0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7::simple_article::ArticleCreatedEvent", null, "1000", false, {"decode":true}]
}' | jq '.result.data[0].decoded_event_data.value.id'

The object ID of the blog that is screened through jp is:

"0xf3264835925cf7573b0da6a5e8b97d6051b695455b012c1d87482b6652892379"

Then, you can use the Rooch CLI to query the status of the object, passing --id to specify the ID of the article object (replace it with the ObjectID of your article):

rooch state --access-path /object/0x6067b5c1f0a6a9d059ab0e2e4fe5ce12832cc4036aa5ca451611d0dd971192e1
[joe@mx simple_blog]$ rooch state --access-path /object/0xf3264835925cf7573b0da6a5e8b97d6051b695455b012c1d87482b6652892379
 
[
  {
    "value": "0x01f3264835925cf7573b0da6a5e8b97d6051b695455b012c1d87482b6652892379ff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7005350415253455f4d45524b4c455f504c414345484f4c4445525f484153480000000000000000000000000000000000000b48656c6c6f20526f6f636833416363656c65726174696e6720576f726c642773205472616e736974696f6e20746f20446563656e7472616c697a6174696f6e",
    "value_type": "0x2::object::ObjectEntity<0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7::simple_article::Article>",
    "decoded_value": {
      "abilities": 0,
      "type": "0x2::object::ObjectEntity<0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7::simple_article::Article>",
      "value": {
        "flag": 0,
        "id": "0xf3264835925cf7573b0da6a5e8b97d6051b695455b012c1d87482b6652892379",
        "owner": "0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7",
        "size": "0",
        "state_root": "0x5350415253455f4d45524b4c455f504c414345484f4c4445525f484153480000",
        "value": {
          "abilities": 12,
          "type": "0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7::simple_article::Article",
          "value": {
            "body": "Unlocking infinite utility for the Bitcoin Economy",
            "title": "Hello Rooch",
            "version": "0"
          }
        }
      }
    },
    "display_fields": null
  }
]

Pay attention to the two key-value pairs title and body in the output, and you can see that this object does 'store' the blog post you just wrote.

We can also use the previous command to query MyBlog Resource under the account:

[joe@mx simple_blog]$ rooch state --access-path /resource/0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7/0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7::simple_blog::MyBlog
[
  {
    "value": "0x0a526f6f636820626c6f670101f3264835925cf7573b0da6a5e8b97d6051b695455b012c1d87482b6652892379",
    "value_type": "0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7::simple_blog::MyBlog",
    "decoded_value": {
      "abilities": 12,
      "type": "0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7::simple_blog::MyBlog",
      "value": {
        "articles": ["0xf3264835925cf7573b0da6a5e8b97d6051b695455b012c1d87482b6652892379"],
        "name": "Rooch blog"
      }
    },
    "display_fields": null
  }
]

As you can see, the articles field in MyBlog stores the object ID of the article we just created.

4.3.5 Updating Articles

We try to update the content of an article using the update_article function.

--function specifies to execute the update function in the simple_blogmodule published at address 0x5078ae74bac281e65fc446b467a843b186904a1b2d435f367030fc755eef1081, that is, to update a blog post. Also need to use --sender-account to specify the account that will send this update article transaction. This function requires us to pass three parameters to it, specified by --args, the first parameter is the object ID of the article to be modified, and the latter two parameters correspond to the title and body of the article respectively.

Change the title of the article to be Foo and the body of the article to be Bar:

rooch move run --function default::simple_blog::update_article --sender-account default --args 'object_id:0xf3264835925cf7573b0da6a5e8b97d6051b695455b012c1d87482b6652892379' --args 'string:Foo' --args 'string:Bar'

In addition to using the Rooch CLI, you can also query the state of objects by calling JSON RPC:

curl --location --request POST 'http://127.0.0.1:50051/' --header 'Content-Type: application/json' --data-raw '{
 "id":101,
 "jsonrpc":"2.0",
 "method":"rooch_getStates",
 "params":["/object/0xf3264835925cf7573b0da6a5e8b97d6051b695455b012c1d87482b6652892379", {"decode": true}]
}'

In the output, it can be observed that the title and body of the article are successfully modified:

{
  "jsonrpc": "2.0",
  "result": [
    {
      "value": "0x01f3264835925cf7573b0da6a5e8b97d6051b695455b012c1d87482b6652892379ff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7005350415253455f4d45524b4c455f504c414345484f4c4445525f4841534800000000000000000000010000000000000003466f6f03426172",
      "value_type": "0x2::object::ObjectEntity<0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7::simple_article::Article>",
      "decoded_value": {
        "abilities": 0,
        "type": "0x2::object::ObjectEntity<0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7::simple_article::Article>",
        "value": {
          "flag": 0,
          "id": "0xf3264835925cf7573b0da6a5e8b97d6051b695455b012c1d87482b6652892379",
          "owner": "0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7",
          "size": "0",
          "state_root": "0x5350415253455f4d45524b4c455f504c414345484f4c4445525f484153480000",
          "value": {
            "abilities": 12,
            "type": "0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7::simple_article::Article",
            "value": { "body": "Bar", "title": "Foo", "version": "1" }
          }
        }
      },
      "display_fields": null
    }
  ],
  "id": 101
}

4.3.6 Delete article

A transaction can be submitted like this, calling simple_blog::delete_article to delete an article:

rooch move run --function default::simple_blog::delete_article --sender-account default --args 'object_id:0xf3264835925cf7573b0da6a5e8b97d6051b695455b012c1d87482b6652892379'

--function specifies to execute the delete_article function in the simple_blogmodule published at 0x5078ae74bac281e65fc446b467a843b186904a1b2d435f367030fc755eef1081, that is, to delete a blog post. Also need to use --sender-account to specify the account to send this delete article transaction. This function only needs to pass one parameter to it, which is the object ID corresponding to the article, specified by --args.

4.3.7 Check whether the article is deleted normally

[joe@mx simple_blog]$ rooch state --access-path /object/0xf3264835925cf7573b0da6a5e8b97d6051b695455b012c1d87482b6652892379
 
[
  null
]

As you can see, when querying the object ID of the article, the result returns null. The description article has been deleted. Then query MyBlog Resource:

[joe@mx simple_blog]$ rooch state --access-path /resource/0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7/0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7::simple_blog::MyBlog
[
  {
    "value": "0x0a526f6f636820626c6f6700",
    "value_type": "0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7::simple_blog::MyBlog",
    "decoded_value": {
      "abilities": 12,
      "type": "0xff795489ecdf184de120244354a3bcf7471cd7683780cb6f19b2336b2ca239b7::simple_blog::MyBlog",
      "value": {
        "articles": [],
        "name": "Rooch blog"
      }
    },
    "display_fields": null
  }
]

As you can see, the articles array is empty, indicating that the article list has also been updated.

5. Summary

At this point, I believe you have a basic understanding of how Rooch v0.1 works, how to publish contracts, and how to interact with contracts. To experience more contract examples on Rooch, see rooch/examples (opens in a new tab).

If you want to directly experience the functions of this blog contract, you can directly download the blog source code (opens in a new tab), decompress it, and switch to the root directory of the blog contract project. For the interactive method, please refer to the above.

wget https://github.com/rooch-network/rooch/archive/refs/heads/main.zip
unzip main.zip
cd rooch-main/examples/simple_blog
Coin IntroExtending Bitcoin