docker: add send payment alice->bob workflow for newcomers
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docker/README.md
151
docker/README.md
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### Getting started
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This document is written for people who are eager to do something with
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lightning network daemon (`lnd`). Current workflow is big because we
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recreate the whole network by ourselves, next versions will use the
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started `btcd` bitcoin node in `testnet` and `faucet` wallet from which
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you will get the bitcoins.
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In current readme we decribe the steps which are needed to recreate
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following schema, and send payment from `Alice` to `Bob`.
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```
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+ ----- + + --- +
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| Alice | <--- channel ---> | Bob | <--- Bob and Alice are the lightning network daemons which
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+ ----- + + --- + creates the channel and interact with each other using
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| | Bitcoin network as source of truth.
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| |
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+ - - - - - + - - - - - - +
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|
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+ ---------------- +
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| Bitcoin network | <--- In current scenario for simplicity we create only one
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+ ---------------- + "btcd" node which represents the Bitcoin network, in
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real situation Alice and Bob will likely be
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connected to different Bitcoin nodes.
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```
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#### Prerequisites
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Name | Version
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--------|---------
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docker-compose | 1.9.0
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docker | 1.13.0
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**General workflow is following:**
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* Create Bitcoin network
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* Create `Alice` node
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* Create `Bob` node
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* Initialize `Alice` node with some amount of bitcoins
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* Open channel between `Alice` and `Bob`
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* Send payment from `Alice` to `Bob`
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Start the `btcd`, create `Alice` address and mine some bitcoins.
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```bash
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# Create "btcd" node:
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$ docker-compose up -d "btcd"
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# Run "Alice" container and log into it:
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$ docker-compose up -d "alice"
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$ docker exec -i -t "alice" bash
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# Generate new backward compatible "segwit" "alice" address:
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alice$ lncli newaddress np2wkh
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# Recreate "btcd" node and set "alice" address as mining address:
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$ MINING_ADDRESS=<alice_address> docker-compose up -d "btcd"
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# Generate 201 block (we need at least "100 >=" blocks because of coinbase
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# block maturity and "250 >=" in order to activate segwit):
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$ docker-compose run btcctl generate 250
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# Check that segwit is active:
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$ docker-compose run btcctl getblockchaininfo | grep -A 1 segwit
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```
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Now we have `btcd` node turned on and some amount of bitcoins mined on
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`Alice` address. But in order `lnd` saw them lets restart the `lnd`
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daemon.
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```bash
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# Stop "Alice" container:
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$ docker-compose stop "alice"
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# Start "Alice" container and log into it:
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$ docker-compose up --no-recreate -d "alice"
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$ docker exec -i -t "alice" bash
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# Check "Alice" balance:
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alice$ lncli walletbalance --witness_only=true
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```
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Connect `Bob` node to `Alice` node.
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```bash
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# Run "Bob" node and log into it:
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$ docker-compose up --no-recreate -d "bob"
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$ docker exec -i -t "bob" bash
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# Get the identity address of "Bob" node:
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bob$ lncli getinfo
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# Get the IP address of "Bob" node:
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$ docker inspect "bob" | grep IPAddress
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# Connect "Alice" to the "Bob" node:
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alice$ lncli connect <bob_identity_address>@<bob_host>:10011
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# Check list of peers on "Alice" side:
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alice$ lncli listpeers
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# Check list of peers on "Bob" side:
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bob$ lncli listpeers
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```
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Create `Alice<->Bob` channel.
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```bash
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# Open the channel with "Bob":
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alice$ lncli openchannel --node_key=<bob_lightning_id> --num_confs=1 --local_amt=1000000 --push_amt=0
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# Include funding transaction in block thereby open the channel:
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$ docker-compose run btcctl generate 1
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# Check that channel with "Bob" was created:
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alice$ lncli listchannels
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```
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Send the payment form "Alice" to "Bob".
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```
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# Add invoice on "Bob" side:
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bob> lncli addinvoice --value=10000
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# Send payment from "Alice" to "Bob":
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alice> lncli sendpayment --pay_req=<encoded_invoice>
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# Check "Alice" channel balance was descreased on sent amount:
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alice> lncli listchannels
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# Check "Bob" channel balance was increased on sent amount:
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bob> lncli listchannels
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```
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Now we have open channel in which we sent only one payment, lets imagine
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that we sent a lots of them and we ok to close channel. Lets do it.
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```
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# List the "Alice" channel and retrieve "channel_point" which represent
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# the opened channel:
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alice> lncli listchannels
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# Channel point consist of two numbers devided by ":" the first on is
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# "funding_txid" and the second one is "output_index":
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alice> lncli closechannel --funding_txid=<funding_txid> --output_index=<output_index>
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# Include close transaction in block thereby close the channel:
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$ docker-compose run btcctl generate 1
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# Check "Alice" on-chain balance was descresed on sent amount:
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alice> lncli walletbalance
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# Check "Bob" on-chain balance was increased on sent amount:
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bob> lncli walletbalance
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```
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### Questions
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* How to see `alice` | `bob` | `btcd` logs?
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```
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docker-compose logs <alice|bob|btcd>
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```
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@ -2,27 +2,36 @@ FROM golang:1.7
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MAINTAINER Olaoluwa Osuntokun <laolu@lightning.network>
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# Expose mainnet ports (server, rpc)
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EXPOSE 8333 8334
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# Expose testnet ports (server, rpc)
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EXPOSE 18333 18334
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# Expose simnet ports (server, rpc)
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EXPOSE 18555 18556
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# Expose segnet ports (server, rpc)
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EXPOSE 28901 28902
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# Grab and install the latest version of roasbeef's fork of btcd and all
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# related dependencies.
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RUN go get -u -v github.com/roasbeef/btcd/...
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# Expose the mainnet, testnet, simnet, and segnet listening ports.
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EXPOSE 8333 18333 18335 28901
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RUN mkdir "/rpc" "/root/.btcd" "/root/.btcctl"
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RUN touch "/root/.btcd/btcd.conf"
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# Expose the mainnet, testnet, simnet, and segnet rpc ports.
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EXPOSE 8333 18333 18336 28902
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# Manually generate certificate and add all domains, it is needed to connect
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# "btcctl" and "lnd" to "btcd" over docker links.
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RUN "/go/bin/gencerts" --host="*" --directory="/rpc" --force
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# Create a volume to house the RPC credentials. This will be shared with any
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# lnd containers so they can securely query btcd's RPC server.
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# Create a volume to house pregenerated RPC credentials. This will be
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# shared with any lnd, btcctl containers so they can securely query btcd's RPC
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# server.
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# You should NOT do this before certificate generation!
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# Otherwise manually generated certificate will be overriden with shared
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# mounted volume! For more info read dockerfile "VOLUME" documentation.
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VOLUME ["/rpc"]
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VOLUME ["/data"]
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RUN mkdir /root/.btcd && mkdir /root/.btcctl
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COPY btcd-start.sh /
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# Finally, execute the shell script that will start btcd. We use a shell script
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# rather than executing the command directly with ENTRYPOINT in order to ensure
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# environment variables get properly substitued.
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ENTRYPOINT ["/btcd-start.sh"]
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COPY "start-btcctl.sh" .
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COPY "start-btcd.sh" .
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#!/bin/bash
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/go/bin/btcd --datadir=/data --logdir=/data --simnet \
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--rpccert=/rpc/rpc.cert --rpckey=/rpc/rpc.key \
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--rpcuser=${RPCUSER} --rpcpass=${RPCPASS} --rpclisten=0.0.0.0 \
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--debuglevel=debug
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docker/btcd/start-btcctl.sh
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docker/btcd/start-btcctl.sh
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#!/usr/bin/env bash
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# Check env variable and in case of empty value and default value specified
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# returns default value, in case of non-empty value returns value.
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set_env() {
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# docker initialized env variables with blank string and we can't just
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# use -z flag as usually.
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BLANK_STRING='""'
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VARIABLE="$1"
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NAME="$2"
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DEFAULT="$3"
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if [[ -z "$VARIABLE" || "$VARIABLE" == "$BLANK_STRING" ]]; then
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if [ -z "$DEFAULT" ]; then
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echo "You should specify '$NAME' env variable"
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exit 0
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else
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VARIABLE="$DEFAULT"
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fi
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fi
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# echo is used as return in case if string values
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echo "$VARIABLE"
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}
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RPCUSER=$(set_env "$RPCUSER" "RPCUSER")
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RPCPASS=$(set_env "$RPCPASS" "RPCPASS")
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btcctl \
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--simnet \
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--rpccert="/rpc/rpc.cert" \
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--rpcuser="$RPCUSER" \
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--rpcpass="$RPCPASS" \
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--rpcserver="rpcserver" \
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"$@"
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docker/btcd/start-btcd.sh
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docker/btcd/start-btcd.sh
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#!/usr/bin/env bash
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# Check env variable and in case of empty value and default value specified
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# returns default value, in case of non-empty value returns value.
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set_env() {
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# docker initialized env variables with blank string and we can't just
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# use -z flag as usually.
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BLANK_STRING='""'
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VARIABLE="$1"
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NAME="$2"
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DEFAULT="$3"
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if [[ -z "$VARIABLE" || "$VARIABLE" == "$BLANK_STRING" ]]; then
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if [ -z "$DEFAULT" ]; then
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echo "You should specify '$NAME' env variable"
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exit 0
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else
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VARIABLE="$DEFAULT"
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fi
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fi
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# echo is used as return in case if string values
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echo "$VARIABLE"
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}
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RPCUSER=$(set_env "$RPCUSER" "RPCUSER")
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RPCPASS=$(set_env "$RPCPASS" "RPCPASS")
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DEBUG=$(set_env "$DEBUG" "DEBUG")
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MINING_ADDRESS=$(set_env "$MINING_ADDRESS" "MINING_ADDRESS" "ScoDuqH7kYA9nvxuRg4Xk7E31AhsSc5zxp")
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btcd \
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--debuglevel="$DEBUG" \
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--datadir="/data" \
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--logdir="/data" \
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--simnet \
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--rpccert="/rpc/rpc.cert" \
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--rpckey="/rpc/rpc.key" \
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--rpcuser="$RPCUSER" \
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--rpcpass="$RPCPASS" \
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--miningaddr="$MINING_ADDRESS" \
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--rpclisten="0.0.0.0" \
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"$@"
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version: '2'
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services:
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btc:
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image: btcd
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build:
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context: btcd/
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volumes:
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- shared:/rpc
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environment:
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- RPCUSER="devuser"
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- RPCPASS="devpass"
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btcd:
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extends: btc
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container_name: btcd
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environment:
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- RPCUSER=devuser
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- RPCPASS=devpass
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build:
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context: btcd/
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expose:
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- "18336"
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volumes:
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- shared-volume:/rpc
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lnd:
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environment:
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- RPCUSER=devuser
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- RPCPASS=devpass
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build:
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context: ../
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dockerfile: docker/lnd/Dockerfile
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expose:
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- "10009"
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- "10011"
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volumes:
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- shared-volume:/rpc
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- DEBUG="debug"
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- MINING_ADDRESS
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entrypoint: ["./start-btcd.sh"]
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btcctl:
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extends: btc
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container_name: btcctl
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links:
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- "btcd:rpcserver"
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entrypoint: ["./start-btcctl.sh"]
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lnd:
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image: lnd
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build:
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context: ../
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dockerfile: docker/lnd/Dockerfile
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environment:
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- RPCUSER="devuser"
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- RPCPASS="devpass"
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- DEBUG="debug"
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volumes:
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- shared:/rpc
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entrypoint: ["./start-lnd.sh"]
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alice:
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extends: lnd
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container_name: alice
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links:
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- btcd
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bob:
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extends: lnd
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container_name: bob
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links:
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- btcd
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volumes:
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shared-volume: {}
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shared:
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driver: local
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@ -13,18 +13,7 @@ ENV GODEBUG netdns=cgo
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RUN go build
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RUN go install . ./cmd/...
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# Mount a volume where btcd's RPC credentials are stored. We'll need to read
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# the TLS cert from this directory.
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VOLUME ["/rpc"]
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# Expose lnd ports (server, rpc).
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EXPOSE 10011 10009
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VOLUME ["/data"]
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# Expose the p2p listening port, and the current RPC port.
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EXPOSE 10009 10011
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COPY docker/lnd/lnd-start.sh /
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# Finally, execute the shell script that will start lnd. We use a shell script
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# rather than executing the command directly with ENTRYPOINT in order to ensure
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# environment variables get properly substitued.
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ENTRYPOINT ["/lnd-start.sh"]
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COPY "docker/lnd/start-lnd.sh" .
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#!/bin/bash
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/go/bin/lnd --datadir=/data --logdir=/data --simnet \
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--btcdhost=btcd --rpccert=/rpc/rpc.cert \
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--rpcuser=${RPCUSER} --rpcpass=${RPCPASS} --debuglevel=debug
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docker/lnd/start-lnd.sh
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docker/lnd/start-lnd.sh
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#!/usr/bin/env bash
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# Check env variable and in case of empty value and default value specified
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# returns default value, in case of non-empty value returns value.
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set_env() {
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# docker initialized env variables with blank string and we can't just
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# use -z flag as usually.
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BLANK_STRING='""'
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VARIABLE="$1"
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NAME="$2"
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DEFAULT="$3"
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if [[ -z "$VARIABLE" || "$VARIABLE" == "$BLANK_STRING" ]]; then
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if [ -z "$DEFAULT" ]; then
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echo "You should specify '$NAME' env variable"
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exit 0
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else
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VARIABLE="$DEFAULT"
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fi
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fi
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# echo is used as return in case if string values
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echo "$VARIABLE"
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}
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RPCUSER=$(set_env "$RPCUSER" "RPCUSER")
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RPCPASS=$(set_env "$RPCPASS" "RPCPASS")
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DEBUG=$(set_env "$DEBUG" "DEBUG")
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lnd \
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--datadir="/data" \
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--logdir="/data" \
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--simnet \
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--btcdhost="btcd" \
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--rpccert="/rpc/rpc.cert" \
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--rpcuser="$RPCUSER" \
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--rpcpass="$RPCPASS" \
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--debuglevel="$DEBUG" \
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"$@"
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