Ethereum Alarm Clock EAC.js tutorial


Welcome to the short tutorial
on executing and scheduling transactions
on ethereum alarm clock
using js client that we released yesterday
More information on the client
you can find on our GitHub repository
as well as on our documentation page
The recommended way of installing js client
is by using npm repository
Name of the package is eac.js
Since I already installed the client
we can proceed with the tutorial
The important thing is that the client requires a local node
local ethereum node
currently we have deployed our contracts on
Ropsten and Kovan test networks
In this first part of the tutorial
I will show you how to schedule transactions
using our js client
So, in order to do that
you start eac.js – s –block
which means “s” means a scheduling
and block means that the unit of time
will be used by the scheduler will be blocks
The first thing you need to enter is a recipient address
this could be a regular ethereum account
or smart contract address
For the purpose of this tutorial
I will use the default values that are coded
into our client so I will just keep hitting enter
Call data is a data that will be transferred and used
by smart contract in case that a recipient address is a
smart contract
Call gas is the amount of gas that will be used
while sending the transactions to the recipient
Call value is a number of wei
that will be sent with a transaction
Window size is the number of blocks
when a transaction will be executed
The Window start is a block number
where the windows size will start
Gas price is a price of the gas in Gwei
that you want your transaction will be executed with
Donation amount is the amount in gwei that
will be sent to the creators of the ethereum alarm clock
and Payment amount is the amount of wei
that you want to incentivize the executors
You also can specify whether your
transaction requires a certain deposit
More on claiming and deposits
on our documentation page
Ok, after entering all the information
we go to the summary page
you’ll see that we are now going to schedule
the transaction with default values that are in js client
Enter or press Yes we are going to send
our schedule transaction to the ethereum
Kovan network
After successful schedule
we can check the transaction on…
for example one of the
ethereum network scanners like Etherscan
Make sure that you are on the network that you are
using that the client is using
In our case, it’s a Kovan test network
So, here we can see that we have sent
the transaction to the ethereum alarm clock
and we actually created a new smart contract
under this address
In this second part of this tutorial
I will show you how to setup the executor nodes
so you can become an executor and start
collecting rewards for a scheduled transactions
So, in order to do that
we are going to start our js client with -c parameter
Now, you see that we are going to use our
unlocked account from the local node
and currently the balance on the test network
is 4.15 ETH
There is a bunch of comments that you can use
with our client so you can just type
. (dot) for instance getstats
It shows you how many transactions
your executors has executed
Ok, In order to start the client
we explicitly need to type .start method
Ok, so our executor is now started
In order to read the logs
we can use the tail command and see that what’s our
client is actually doing
You can see that our executor found transactions
that we scheduled in the first part of our tutorial
that was found on this address
So, we can go to Etherscan and refresh the page
We see that 1 minute ago
the executor executed this transaction
When you go to the details of the transaction
you will see that both the donation and the payment
has been transferred accordingly
Now we can go back to our client
check the statistics
So, we type .getStats
and here we see that we executed
1 transaction and our earning is 0.15 ether

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