whdev711 / blockchain-network

Install Tendermint

Please see this tutorial : tendermint

Create kvstore application on top of tendermint.

What is kvstore?

The kvstore is an application on top of tendermint.

As you see, Tendermint Core is written in the Golang Programming language. Running this kvstore built in Go inside the same process as tendermint core will give you the best possible performance.

Tendermint Core communicates with the application through the Application BlockChain Interface (ABCI). All message types are defined in the protobuf file.

The kvstore application that we will create is installed at the same time as abci-cli above.The kvstore just stores transactions in a merkle tree. The merkle tree (hash tree) in cryptography and computer science is a tree in which every leaf node is labelled with the cryptographic hash of a data block, and every non-leaf node is labelled with the cryptographic hash of the labels of its child nodes. Please click here.

How to create and use kvstore.

The source code is defined here.

The kvstore is been running like this:

start application like this:

abci-cli kvstore

And in another terminal, run

abci-cli echo hello
abci-cli info

You'll see something like:

-> data: hello
-> data.hex: 68656C6C6F

and:

-> data: {"size":0}
-> data.hex: 7B2273697A65223A307D

abci-cli deliver_tx "kvstore_example"
abci-cli commit
abci-cli info

if then:

-> code: OK
-> data: {"size":1}
-> data.hex: 0x7B2273697A65223A317D

also:

abci-cli query "kvstore_example"

-> code: OK
-> log: exists
-> height: 2
-> value: kvstore_example
-> value.hex: 615373

An ABCI application must provide two things:

• a socket server
• a handler for ABCI messages

When we run the abci-cli tool we open a new connection to the application's socket server, send the given ABCI message, and wait for a response.

Note

This web application will be integrated with kvstore for Tendermint Core application.