dex/testing: add script for two-wallet testing (#2535)

* add script for two-wallet testing

dex/testing/walletpair/README.md

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+# walletpair.sh
+
+This is a tmux script for a 2-wallet pair that developers can use to perform manual testing on mainnet and testnet. The script aims to solve a number of problems.
+
+- Testing by self-trading with a single wallet has historically failed to detect some bugs.
+- Keeping your personal mainnet wallet on a release branch is advisable, so we don't want to use our primary wallet for testing.
+- For testing on mainnet, we want to use a testing server that has ultra-low lot limits and bond size, and we only want to run the nodes/markets that we're interested in testing. It's not usually a server suitable for public use.
+
+**walletpair.sh** will create two dexc instances, and open browser windows to
+them. Wallet data is persisted through restarts, so you can send mainnet funds
+without risk of loss. That said, this is for testing, so only send what you can
+lose in case of massive catastrophe.
+
+Use `--testnet` flag to run on testnet.

dex/testing/walletpair/walletpair.sh

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+#!/usr/bin/env bash
+
+export SHELL=$(which bash)
+SESSION="walletpair"
+PAIR_ROOT=~/dextest/walletpair
+CLIENT_1_DIR="${PAIR_ROOT}/dexc1"
+CLIENT_1_ADDR="127.0.0.4:5760"
+CLIENT_2_DIR="${PAIR_ROOT}/dexc2"
+CLIENT_2_ADDR="127.0.0.5:5761"
+HARNESS_DIR="${PAIR_ROOT}/harness-ctl"
+DEXC_DIR=$(realpath ../../../client/cmd/dexc)
+DEXC="${DEXC_DIR}/dexc"
+
+cd "${DEXC_DIR}"
+go build
+cd -
+
+mkdir -p "${HARNESS_DIR}"
+mkdir -p "${CLIENT_1_DIR}"
+mkdir -p "${CLIENT_2_DIR}"
+
+CLIENT_1_CONF="${CLIENT_1_DIR}/dexc.conf"
+rm -f "${CLIENT_1_CONF}"
+cat > "${CLIENT_1_CONF}" <<EOF
+webaddr=${CLIENT_1_ADDR}
+experimental=true
+EOF
+
+CLIENT_2_CONF="${CLIENT_2_DIR}/dexc.conf"
+rm -f "$CLIENT_2_CONF"
+cat > "$CLIENT_2_CONF" <<EOF
+webaddr=${CLIENT_2_ADDR}
+experimental=true
+EOF
+
+QUIT_FILE="${HARNESS_DIR}/quit"
+rm -f "${QUIT_FILE}"
+cat > "${QUIT_FILE}" <<EOF
+#!/usr/bin/env bash
+tmux send-keys -t $SESSION:1 C-c
+tmux send-keys -t $SESSION:2 C-c
+sleep 1
+tmux kill-session
+EOF
+chmod +x "${QUIT_FILE}"
+
+echo "xdg-open http://${CLIENT_1_ADDR} > /dev/null 2>&1" > "${HARNESS_DIR}/dexc1"
+chmod +x "${HARNESS_DIR}/dexc1"
+
+echo "xdg-open http://${CLIENT_2_ADDR} > /dev/null 2>&1" > "${HARNESS_DIR}/dexc2"
+chmod +x "${HARNESS_DIR}/dexc2"
+
+tmux new-session -d -s $SESSION $SHELL
+tmux rename-window -t $SESSION:0 'harness-ctl'
+
+tmux new-window -t $SESSION:1 -n 'dexc1' $SHELL
+tmux send-keys -t $SESSION:1 "cd ${PAIR_ROOT}/dexc1" C-m
+tmux send-keys -t $SESSION:1 "${DEXC} --appdata=${CLIENT_1_DIR} ${@}" C-m
+
+tmux new-window -t $SESSION:2 -n 'dexc1' $SHELL
+tmux send-keys -t $SESSION:2 "cd ${PAIR_ROOT}/dexc1" C-m
+tmux send-keys -t $SESSION:2 "${DEXC} --appdata=${CLIENT_2_DIR} ${@}" C-m
+
+tmux select-window -t $SESSION:0
+sleep 1
+tmux send-keys -t $SESSION:0 "cd ${HARNESS_DIR}; tmux wait-for -S walletpair" C-m\; wait-for walletpair
+tmux send-keys -t $SESSION:0 "./dexc1; tmux wait-for -S walletpair" C-m\; wait-for walletpair
+tmux send-keys -t $SESSION:0 "./dexc2" C-m
+tmux attach-session -t $SESSION