How to Get Blockchain Version of Steem RPC Node using Javascript

Time：2020-09-07 12:26:38
Class：Weblog
Read：27

NodeJs / Javascript

In the Load Balancer RPC Node: https://steem.justyy.workers.dev the return response contains a custom header version which is basically the Version of the RPC Node for the Invoked Steem Node. To obtain this information, it is basically the same as sending the following parameters to invoke the get_version api:

1	{"id":0,"jsonrpc":"2.0","method":"call","params":["login_api","get_version",[]]}

{"id":0,"jsonrpc":"2.0","method":"call","params":["login_api","get_version",[]]}

To wrap it in async Javascript Function – which returns the version string:

async function getVersion(server) {
  return new Promise((resolve, reject) => {
    fetch(server, {
      method: "POST",
      headers: {
        'Content-Type': 'application/json'
      },
      body: JSON.stringify({"id":0,"jsonrpc":"2.0","method":"call","params":["login_api","get_version",[]]})
    }).then(response => {
      resolve(response.text());
    }).catch(function(error) {
      reject(error);
    });
  });
}

async function getVersion(server) {
  return new Promise((resolve, reject) => {
    fetch(server, {
      method: "POST",
      headers: {
        'Content-Type': 'application/json'
      },
      body: JSON.stringify({"id":0,"jsonrpc":"2.0","method":"call","params":["login_api","get_version",[]]})
    }).then(response => {
      resolve(response.text());
    }).catch(function(error) {
      reject(error);
    });
  });
}

To invoke it, we can do something like this:

(async function() {
    const ver = await getVersion("https://api.justyy.com");
    console.log(ver);
})();

(async function() {
    const ver = await getVersion("https://api.justyy.com");
    console.log(ver);
})();

This gives the following to the console:

{"jsonrpc":"2.0","result":{"blockchain_version":"0.23.1",
"steem_revision":"46c7d93db350e8b031a81626e727c92b27d7348b",
"fc_revision":"46c7d93db350e8b031a81626e727c92b27d7348b"},
"id":0}

{"jsonrpc":"2.0","result":{"blockchain_version":"0.23.1",
"steem_revision":"46c7d93db350e8b031a81626e727c92b27d7348b",
"fc_revision":"46c7d93db350e8b031a81626e727c92b27d7348b"},
"id":0}

The above code can be viewed and tested directly in the SteemJs Editor

–EOF (The Ultimate Computing & Technology Blog) —

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