How to use

For terra oracle, you can separate the validator and the feeder that send oracle transactions repeatably. To set feeder, you can use the cli command "terracli tx oracle set-feeder". To send transactions, it is necessary to find private key, so you should execute this software in an environment with your local wallet. But, I recommend separating the validator and the feeder and execute this in the local wallet that has the only feeder account.
By default, Tendermint waits 10 seconds for the transaction to be committed. But this timeout is too short to detect the transaction was committed in 5 blocks (default voting period). So I recommend increasing timeout_broadcast_tx_commit option in config.toml.
And make sure that you include ukrw in minimum gas price in terrad.toml to let users pay the fee by ukrw.

Changelog

v0.0.5-alpha.11

Patch band oracle to use data from band-laozi-poa(by @Benzbeeb)

v0.0.5-alpha.10

Add vote list for Proposal#83: {DKK, NOK}

v0.0.5-alpha.9-b

Add vote list for Proposal#78: {SEK}(by @hanjukim)
To use the Systemd service, you need to enter the name and password in the [Feeder] part of config.toml

v0.0.5-alpha.8-a

Running terra-oracle register-systemd creates terra-oracle_starter in $GOPATH and creates /etc/systemd/system/terra-oracle.service
Restart oracle when reveal period or failed to execute message occurs in rawlog
Fix typos(Thanks @petes-fan-club)

v0.0.5-alpha.7

Changed the price base of KRW from Bithumb to Coinone

v0.0.5-alpha.6

Add vote list for Proposal#38: {THB}
Configuration change in config.toml

v0.0.5-alpha.5

Patch terra oracle to use data from band guanyu mainnet(by @Benzbeeb)
Make sure the band's API is https://terra-lcd.bandchain.org in config.toml.

v0.0.5-alpha.4

Update price server is using USD quote instead KRW & also seperate KRW from the USD price(by @YunSuk-Yeo)
Code Simplification(oracle/tx.go)

v0.0.5-alpha.3

The prices of all stable coins come from the API of the currencylayer.com
Add vote list for Proposal#26: {CNY, JPY, GBP, INR, CAD, CHF, HKD, AUD, SGD}
Added Band API activation option to config.toml(true/false)
Configuration change in config.toml

v0.0.5-alpha.2

Add EUR Oracle vote.

v0.0.5-alpha.1

Added Bandchain API (by @prin-r)

v0.0.4-alpha.1

Add Flag in Service command for systemd service: --vote-mode (default aggregate)
Dependency was updated. (terra-core v0.3.0 -> v0.4.0 / cosmos-sdk v0.39.1 / tendermint v0.33.7)

v0.0.3-alpha.4

Fix error: "Fail to parse price to int module=price market=luna/krw"

v0.0.3-alpha.3

Add Command: terra-oracle version
Add Flag in Service command for systemd service: --config

v0.0.3-alpha.2

Save settings in config.toml file.
For MNT oracle we need the API Key of currencylayer. (https://currencylayer.com/product)
Added recovery procedure if prevote+vote transaction fails.

v0.0.3-alpha.1

VotePeriod = 12 -> VotePeriod = 5.
Add MNT Oracle vote.
Dependency was updated. (terra-core v0.2.3 -> v0.3.0-rc2)

v0.0.2-alpha.2

Soft/hard limit was added for rate of luna price chagne.
(The rate of change is calculated per 12 blocks(voting period).
If it exceeds the soft limit, an alert will occur,
and the value which does not exceed the soft limit will be submitted continuously.
If it exceeds the hard limit, the program will be exited.)
Now vote msgs will be sent with prevote for next vote.

v0.0.2-alpha.1

Dependency was updated. (terra-core v0.2.1 -> v0.2.3)

This software used go module for dependency management, so you should locate this outside of the GOPATH or set GO111MODULE=on in environment variable set.
Checkout https://github.com/golang/go/wiki/Modules

Install

cd $HOME
git clone https://github.com/node-a-team/terra-oracle.git
cd $HOME/terra-oracle 
go install ./cmd/terra-oracle

terra-oracle version
## v0.0.5-alpha.8-a

Set your basic config for cli.

terracli config chain-id {chain_id}
terracli config node {endpoint_of_your_node_rpc}

ex)
terracli config chain-id columbus-4
terracli config node tcp://localhost:26657

Set your feeder.

terracli tx oracle set-feeder {address_of_feeder} --from={name_of_validator_account} --fees 35610000ukrw 

// ex)
terracli tx oracle set-feeder terra1uq0z26lahq7ekavpf9cgl8ypxnj7ducat60a4w --from=VALIDATOR --fees 35610000ukrw 

Start terra-oracle.

terra-oracle service --from={name_of_feeder} --broadcast-mode=block --config={path_to_config.toml} --vote-mode aggregate

// ex)
terra-oracle service --from=ORACLE --broadcast-mode=block --config=$HOME/terra-oracle --vote-mode aggregate

Start with Systemd service.

1. You must enter the name and password in the [Feeder] part of config.toml
2. You need to install expect: sudo apt install expect -y

terra-oracle register-systemd --from={name_of_feeder} --config={path_to_config.toml}

// ex)
terra-oracle register-systemd --from=ORACLE --config=$HOME/terra-oracle
sudo systemctl start terra-oracle.service

// log)
journalctl -f -u terra-oracle.service