script: serve state dump (#229)

* script: serve state dump

* feat: python2

* cleanup

* yarn: add serve script

packages/contracts/bin/serve_dump.sh

+#!/bin/bash
+
+# Run this script to serve the latest state dump from
+# an http server. This is useful to serve the state dump
+# to a local instance of the sequencer/verifier during
+# development. The state dump can be found at
+# `GET /state-dump.latest.json`
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" > /dev/null && pwd )"
+
+PYTHON=${PYTHON:-python}
+HOST=${HOST:-0.0.0.0}
+PORT=${PORT:-8081}
+DIRECTORY=$DIR/../build/dumps
+
+if [ ! command -v $PYTHON&>/dev/null ]; then
+    echo "Please install python"
+    exit 1
+fi
+
+VERSION=$($PYTHON --version 2>&1 \
+    | cut -d ' ' -f2 \
+    |  sed -Ee's#([^/]).([^/]).([^/])#\1#')
+
+
+if [[ $VERSION == 3 ]]; then
+    $PYTHON -m http.server \
+        --bind $HOST $PORT \
+        --directory $DIRECTORY
+else
+    (
+        echo "Serving HTTP on $HOST port $PORT"
+        cd $DIRECTORY
+        $PYTHON -c \
+            'import BaseHTTPServer as bhs, SimpleHTTPServer as shs; bhs.HTTPServer(("'$HOST'", '"$PORT"'), shs.SimpleHTTPRequestHandler).serve_forever()'
+    )
+fi

packages/contracts/package.json

@@ -29,7 +29,8 @@
     "lint:fix": "yarn run lint:fix:typescript",
     "lint:fix:typescript": "prettier --config prettier-config.json --write \"hardhat.config.ts\" \"{src,test}/**/*.ts\"",
     "clean": "rm -rf ./artifacts ./build ./cache",
-    "deploy": "./bin/deploy.js"
+    "deploy": "./bin/deploy.js",
+    "serve": "./bin/serve_dump.sh"
   },
   "dependencies": {
     "@ethersproject/abstract-provider": "^5.0.8",