bft blockchain consensus consistency cryptocurrency cryptography db distributed-systems go

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Using with lightclient

We have an awesome cluster running, let's try to test this out without relying on executing commands on the cluster. Rather, we can connect to the rpc interface with the light-client package and execute commands locally, or even proxy our webapp to the kubernetes backend.

Setup

In order to get this working, we need to know a few pieces of info, the chain id of tendermint, the chain id of basecoin, and an account with a bit of cash....

Tendermint Chain ID

kubectl exec -c tm tm-0 -- curl -s http://tm-1.basecoin:46657/status | json_pp | grep network

set TM_CHAIN with the value there

Basecoin Chain ID

kubectl exec -c app tm-1 -- grep -A1 chainID /app/genesis.json

set BC_CHAIN with the value there

Expose tendermint rpc

We need to be able to reach the tendermint rpc interface from our shell.

kubectl port-forward tm-0 46657:46657

Start basecoin-proxy

Using this info, let's connect our proxy and get going

proxy-basecoin -tmchain=$TM_CHAIN -chain=$BC_CHAIN -rpc=localhost:46657

Basecoin accounts

Well, we can connect, but we don't have a registered account yet... Let's look around, then use the cli to send some money from one of the validators to our client's address so we can play.

TODO we can add some of our known accounts (from /keys) into the genesis file, so we can skip all the kubectl money fiddling here. We will want to start with money on some known non-validators.

Getting validator info (kubectl)

The basecoin app deployment starts with 1000 "blank" coin in an account of each validator. Let's get the address of the first validator

kubectl exec -c app tm-1 -- grep address /app/key.json

Store this info as VAL1_ADDR

Querying state (proxy)

The proxy can read any public info via the tendermint rpc, so let's check out this account.

curl localhost:8108/query/account/$VAL1_ADDR

Now, let's make out own account....

curl -XPOST http://localhost:8108/keys/ -d '{"name": "k8demo", "passphrase": "1234567890"}'

(or pick your own user and password). Remember the address you get here. You can always find it out later by calling:

curl http://localhost:8108/keys/k8demo

and store it in DEMO_ADDR, which is empty at first

curl localhost:8108/query/account/$DEMO_ADDR

"Stealing" validator cash (kubectl)

Run one command, that will be signed, now we have money

kubectl exec -c app tm-0 -- basecoin tx send --to <k8demo-address> --amount 500

Using our money

Returning to our remote shell, we have a remote account with some money. Let's see that.