mirror of
https://github.com/tendermint/tendermint.git
synced 2026-01-07 22:05:18 +00:00
Callum Waters
GitHub
@@ -31,7 +31,6 @@ Available Commands:
|
||||
check_tx Validate a tx
|
||||
commit Commit the application state and return the Merkle root hash
|
||||
console Start an interactive abci console for multiple commands
|
||||
counter ABCI demo example
|
||||
deliver_tx Deliver a new tx to the application
|
||||
kvstore ABCI demo example
|
||||
echo Have the application echo a message
|
||||
@@ -214,140 +213,9 @@ we do `deliver_tx "abc=efg"` it will store `(abc, efg)`.
|
||||
Similarly, you could put the commands in a file and run
|
||||
`abci-cli --verbose batch < myfile`.
|
||||
|
||||
## Counter - Another Example
|
||||
|
||||
Now that we've got the hang of it, let's try another application, the
|
||||
"counter" app.
|
||||
|
||||
Like the kvstore app, its code can be found
|
||||
[here](https://github.com/tendermint/tendermint/blob/v0.34.x/abci/cmd/abci-cli/abci-cli.go)
|
||||
and looks like:
|
||||
|
||||
```go
|
||||
func cmdCounter(cmd *cobra.Command, args []string) error {
|
||||
|
||||
app := counter.NewCounterApplication(flagSerial)
|
||||
|
||||
logger := log.NewTMLogger(log.NewSyncWriter(os.Stdout))
|
||||
|
||||
// Start the listener
|
||||
srv, err := server.NewServer(flagAddrC, flagAbci, app)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
srv.SetLogger(logger.With("module", "abci-server"))
|
||||
if err := srv.Start(); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Stop upon receiving SIGTERM or CTRL-C.
|
||||
tmos.TrapSignal(logger, func() {
|
||||
// Cleanup
|
||||
srv.Stop()
|
||||
})
|
||||
|
||||
// Run forever.
|
||||
select {}
|
||||
}
|
||||
```
|
||||
|
||||
The counter app doesn't use a Merkle tree, it just counts how many times
|
||||
we've sent a transaction, asked for a hash, or committed the state. The
|
||||
result of `commit` is just the number of transactions sent.
|
||||
|
||||
This application has two modes: `serial=off` and `serial=on`.
|
||||
|
||||
When `serial=on`, transactions must be a big-endian encoded incrementing
|
||||
integer, starting at 0.
|
||||
|
||||
If `serial=off`, there are no restrictions on transactions.
|
||||
|
||||
We can toggle the value of `serial` using the `set_option` ABCI message.
|
||||
|
||||
When `serial=on`, some transactions are invalid. In a live blockchain,
|
||||
transactions collect in memory before they are committed into blocks. To
|
||||
avoid wasting resources on invalid transactions, ABCI provides the
|
||||
`check_tx` message, which application developers can use to accept or
|
||||
reject transactions, before they are stored in memory or gossipped to
|
||||
other peers.
|
||||
|
||||
In this instance of the counter app, `check_tx` only allows transactions
|
||||
whose integer is greater than the last committed one.
|
||||
|
||||
Let's kill the console and the kvstore application, and start the
|
||||
counter app:
|
||||
|
||||
```sh
|
||||
abci-cli counter
|
||||
```
|
||||
|
||||
In another window, start the `abci-cli console`:
|
||||
|
||||
```sh
|
||||
> set_option serial on
|
||||
-> code: OK
|
||||
-> log: OK (SetOption doesn't return anything.)
|
||||
|
||||
> check_tx 0x00
|
||||
-> code: OK
|
||||
|
||||
> check_tx 0xff
|
||||
-> code: OK
|
||||
|
||||
> deliver_tx 0x00
|
||||
-> code: OK
|
||||
|
||||
> check_tx 0x00
|
||||
-> code: BadNonce
|
||||
-> log: Invalid nonce. Expected >= 1, got 0
|
||||
|
||||
> deliver_tx 0x01
|
||||
-> code: OK
|
||||
|
||||
> deliver_tx 0x04
|
||||
-> code: BadNonce
|
||||
-> log: Invalid nonce. Expected 2, got 4
|
||||
|
||||
> info
|
||||
-> code: OK
|
||||
-> data: {"hashes":0,"txs":2}
|
||||
-> data.hex: 0x7B22686173686573223A302C22747873223A327D
|
||||
```
|
||||
|
||||
This is a very simple application, but between `counter` and `kvstore`,
|
||||
its easy to see how you can build out arbitrary application states on
|
||||
top of the ABCI. [Hyperledger's
|
||||
Burrow](https://github.com/hyperledger/burrow) also runs atop ABCI,
|
||||
bringing with it Ethereum-like accounts, the Ethereum virtual-machine,
|
||||
Monax's permissioning scheme, and native contracts extensions.
|
||||
|
||||
But the ultimate flexibility comes from being able to write the
|
||||
application easily in any language.
|
||||
|
||||
We have implemented the counter in a number of languages [see the
|
||||
example directory](https://github.com/tendermint/tendermint/tree/master/abci/example).
|
||||
|
||||
To run the Node.js version, fist download & install [the Javascript ABCI server](https://github.com/tendermint/js-abci):
|
||||
|
||||
```sh
|
||||
git clone https://github.com/tendermint/js-abci.git
|
||||
cd js-abci
|
||||
npm install abci
|
||||
```
|
||||
|
||||
Now you can start the app:
|
||||
|
||||
```sh
|
||||
node example/counter.js
|
||||
```
|
||||
|
||||
(you'll have to kill the other counter application process). In another
|
||||
window, run the console and those previous ABCI commands. You should get
|
||||
the same results as for the Go version.
|
||||
|
||||
## Bounties
|
||||
|
||||
Want to write the counter app in your favorite language?! We'd be happy
|
||||
Want to write an app in your favorite language?! We'd be happy
|
||||
to add you to our [ecosystem](https://github.com/tendermint/awesome#ecosystem)!
|
||||
See [funding](https://github.com/interchainio/funding) opportunities from the
|
||||
[Interchain Foundation](https://interchain.io/) for implementations in new languages and more.
|
||||
|
||||
Reference in New Issue
Block a user