First development of the deploy action (#6)

Deploy js code to an instance of screeps.
Some debugging tools are implemented.

Reviewed-on: #6
Co-authored-by: Philipp Horstenkamp <philipp@horstenkamp.de>
Co-committed-by: Philipp Horstenkamp <philipp@horstenkamp.de>

node_modules/prebuild-install/download.js

@@ -0,0 +1,130 @@
+var path = require('path')
+var fs = require('fs')
+var get = require('simple-get')
+var pump = require('pump')
+var tfs = require('tar-fs')
+var noop = Object.assign({
+  http: function () {},
+  silly: function () {}
+}, require('noop-logger'))
+var zlib = require('zlib')
+var util = require('./util')
+var error = require('./error')
+var proxy = require('./proxy')
+var mkdirp = require('mkdirp')
+
+function downloadPrebuild (downloadUrl, opts, cb) {
+  var cachedPrebuild = util.cachedPrebuild(downloadUrl)
+  var tempFile = util.tempFile(cachedPrebuild)
+  var log = opts.log || noop
+
+  ensureNpmCacheDir(function (err) {
+    if (err) return onerror(err)
+
+    log.info('looking for cached prebuild @', cachedPrebuild)
+    fs.access(cachedPrebuild, fs.R_OK | fs.W_OK, function (err) {
+      if (!(err && err.code === 'ENOENT')) {
+        log.info('found cached prebuild')
+        return unpack()
+      }
+
+      log.http('request', 'GET ' + downloadUrl)
+      var reqOpts = proxy({ url: downloadUrl }, opts)
+
+      if (opts.token) {
+        reqOpts.url += '?access_token=' + opts.token
+        reqOpts.headers = {
+          'User-Agent': 'simple-get',
+          'Accept': 'application/octet-stream'
+        }
+      }
+
+      var req = get(reqOpts, function (err, res) {
+        if (err) return onerror(err)
+        log.http(res.statusCode, downloadUrl)
+        if (res.statusCode !== 200) return onerror()
+        mkdirp(util.prebuildCache(), function () {
+          log.info('downloading to @', tempFile)
+          pump(res, fs.createWriteStream(tempFile), function (err) {
+            if (err) return onerror(err)
+            fs.rename(tempFile, cachedPrebuild, function (err) {
+              if (err) return cb(err)
+              log.info('renaming to @', cachedPrebuild)
+              unpack()
+            })
+          })
+        })
+      })
+
+      req.setTimeout(30 * 1000, function () {
+        req.abort()
+      })
+    })
+
+    function onerror (err) {
+      fs.unlink(tempFile, function () {
+        cb(err || error.noPrebuilts(opts))
+      })
+    }
+  })
+
+  function unpack () {
+    var binaryName
+
+    var updateName = opts.updateName || function (entry) {
+      if (/\.node$/i.test(entry.name)) binaryName = entry.name
+    }
+
+    log.info('unpacking @', cachedPrebuild)
+
+    var options = {
+      readable: true,
+      writable: true,
+      hardlinkAsFilesFallback: true
+    }
+    var extract = tfs.extract(opts.path, options).on('entry', updateName)
+
+    pump(fs.createReadStream(cachedPrebuild), zlib.createGunzip(), extract,
+    function (err) {
+      if (err) return cb(err)
+
+      var resolved
+      if (binaryName) {
+        try {
+          resolved = path.resolve(opts.path || '.', binaryName)
+        } catch (err) {
+          return cb(err)
+        }
+        log.info('unpack', 'resolved to ' + resolved)
+
+        if (opts.runtime === 'node' && opts.platform === process.platform && opts.abi === process.versions.modules) {
+          try {
+            require(resolved)
+          } catch (err) {
+            return cb(err)
+          }
+          log.info('unpack', 'required ' + resolved + ' successfully')
+        }
+      }
+
+      cb(null, resolved)
+    })
+  }
+
+  function ensureNpmCacheDir (cb) {
+    var cacheFolder = util.npmCache()
+    fs.access(cacheFolder, fs.R_OK | fs.W_OK, function (err) {
+      if (err && err.code === 'ENOENT') {
+        return makeNpmCacheDir()
+      }
+      cb(err)
+    })
+
+    function makeNpmCacheDir () {
+      log.info('npm cache directory missing, creating it...')
+      mkdirp(cacheFolder, cb)
+    }
+  }
+}
+
+module.exports = downloadPrebuild