docker: add send payment alice->bob workflow for newcomers

docker/btcd/Dockerfile

@@ -2,27 +2,36 @@ FROM golang:1.7
 
 MAINTAINER Olaoluwa Osuntokun <laolu@lightning.network>
 
+# Expose mainnet ports (server, rpc)
+EXPOSE 8333 8334
+
+# Expose testnet ports (server, rpc)
+EXPOSE 18333 18334
+
+# Expose simnet ports (server, rpc)
+EXPOSE 18555 18556
+
+# Expose segnet ports (server, rpc)
+EXPOSE 28901 28902
+
 # Grab and install the latest version of roasbeef's fork of btcd and all
 # related dependencies.
 RUN go get -u -v github.com/roasbeef/btcd/...
 
-# Expose the mainnet, testnet, simnet, and segnet listening ports.
-EXPOSE 8333 18333 18335 28901
+RUN mkdir "/rpc" "/root/.btcd" "/root/.btcctl"
+RUN touch "/root/.btcd/btcd.conf"
 
-# Expose the mainnet, testnet, simnet, and segnet rpc ports.
-EXPOSE 8333 18333 18336 28902
+# Manually generate certificate and add all domains, it is needed to connect
+# "btcctl" and "lnd" to "btcd" over docker links.
+RUN "/go/bin/gencerts" --host="*" --directory="/rpc" --force
 
-# Create a volume to house the RPC credentials. This will be shared with any
-# lnd containers so they can securely query btcd's RPC server.
+# Create a volume to house pregenerated RPC credentials. This will be
+# shared with any lnd, btcctl containers so they can securely query btcd's RPC
+# server.
+# You should NOT do this before certificate generation!
+# Otherwise manually generated certificate will be overriden with shared
+# mounted volume! For more info read dockerfile "VOLUME" documentation.
 VOLUME ["/rpc"]
 
-VOLUME ["/data"]
-
-RUN mkdir /root/.btcd && mkdir /root/.btcctl
-
-COPY btcd-start.sh /
-
-# Finally, execute the shell script that will start btcd. We use a shell script
-# rather than executing the command directly with ENTRYPOINT in order to ensure
-# environment variables get properly substitued.
-ENTRYPOINT ["/btcd-start.sh"]
+COPY "start-btcctl.sh" .
+COPY "start-btcd.sh" .

docker/btcd/btcd-start.sh

@@ -1,7 +0,0 @@
-#!/bin/bash
-
-
-/go/bin/btcd --datadir=/data --logdir=/data --simnet  \
-             --rpccert=/rpc/rpc.cert --rpckey=/rpc/rpc.key  \
-             --rpcuser=${RPCUSER} --rpcpass=${RPCPASS} --rpclisten=0.0.0.0 \
-             --debuglevel=debug

docker/btcd/start-btcctl.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+
+# Check env variable and in case of empty value and default value specified
+# returns default value, in case of non-empty value returns value.
+set_env() {
+    # docker initialized env variables with blank string and we can't just
+    # use -z flag as usually.
+    BLANK_STRING='""'
+
+    VARIABLE="$1"
+    NAME="$2"
+    DEFAULT="$3"
+
+    if [[ -z "$VARIABLE" || "$VARIABLE" == "$BLANK_STRING" ]]; then
+
+        if [ -z "$DEFAULT" ]; then
+            echo "You should specify '$NAME' env variable"
+            exit 0
+        else
+            VARIABLE="$DEFAULT"
+        fi
+    fi
+
+    # echo is used as return in case if string values
+    echo "$VARIABLE"
+}
+
+RPCUSER=$(set_env "$RPCUSER" "RPCUSER")
+RPCPASS=$(set_env "$RPCPASS" "RPCPASS")
+
+btcctl \
+    --simnet \
+    --rpccert="/rpc/rpc.cert" \
+    --rpcuser="$RPCUSER" \
+    --rpcpass="$RPCPASS" \
+    --rpcserver="rpcserver" \
+    "$@"

docker/btcd/start-btcd.sh

@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+
+# Check env variable and in case of empty value and default value specified
+# returns default value, in case of non-empty value returns value.
+set_env() {
+    # docker initialized env variables with blank string and we can't just
+    # use -z flag as usually.
+    BLANK_STRING='""'
+
+    VARIABLE="$1"
+    NAME="$2"
+    DEFAULT="$3"
+
+    if [[ -z "$VARIABLE" || "$VARIABLE" == "$BLANK_STRING" ]]; then
+
+        if [ -z "$DEFAULT" ]; then
+            echo "You should specify '$NAME' env variable"
+            exit 0
+        else
+            VARIABLE="$DEFAULT"
+        fi
+    fi
+
+    # echo is used as return in case if string values
+    echo "$VARIABLE"
+}
+
+RPCUSER=$(set_env "$RPCUSER" "RPCUSER")
+RPCPASS=$(set_env "$RPCPASS" "RPCPASS")
+
+DEBUG=$(set_env "$DEBUG" "DEBUG")
+
+MINING_ADDRESS=$(set_env "$MINING_ADDRESS" "MINING_ADDRESS" "ScoDuqH7kYA9nvxuRg4Xk7E31AhsSc5zxp")
+
+btcd \
+    --debuglevel="$DEBUG" \
+    --datadir="/data" \
+    --logdir="/data" \
+    --simnet \
+    --rpccert="/rpc/rpc.cert" \
+    --rpckey="/rpc/rpc.key" \
+    --rpcuser="$RPCUSER" \
+    --rpcpass="$RPCPASS" \
+    --miningaddr="$MINING_ADDRESS" \
+    --rpclisten="0.0.0.0" \
+    "$@"
+