Use WebSockets for the screen. The screen directive works, but needs a serious cleanup.

lib/units/device/resources/minicap.js

@@ -0,0 +1,92 @@
+var util = require('util')
+
+var Promise = require('bluebird')
+var syrup = require('stf-syrup')
+
+var logger = require('../../../util/logger')
+var pathutil = require('../../../util/pathutil')
+var devutil = require('../../../util/devutil')
+var streamutil = require('../../../util/streamutil')
+
+module.exports = syrup.serial()
+  .dependency(require('../support/adb'))
+  .dependency(require('../support/properties'))
+  .dependency(require('../support/abi'))
+  .define(function(options, adb, properties, abi) {
+    var log = logger.createLogger('device:resources:minicap')
+
+    var resources = {
+      bin: {
+        src: pathutil.requiredMatch(abi.all.map(function(supportedAbi) {
+          return pathutil.vendor(util.format(
+            'minicap/bin/%s/minicap%s'
+          , supportedAbi
+          , abi.pie ? '' : '-nopie'
+          ))
+        }))
+      , dest: '/data/local/tmp/minicap'
+      , comm: 'minicap'
+      , mode: 0755
+      }
+    , lib: {
+        // @todo The lib ABI should match the bin ABI. Currently we don't
+        // have an x86_64 version of the binary while the lib supports it.
+        src: pathutil.requiredMatch(abi.all.map(function(supportedAbi) {
+          return pathutil.vendor(util.format(
+            'minicap/shared/android-%d/%s/minicap.so'
+          , properties['ro.build.version.sdk']
+          , supportedAbi
+          ))
+        }))
+      , dest: '/data/local/tmp/minicap.so'
+      , mode: 0755
+      }
+    }
+
+    function removeResource(res) {
+      return adb.shell(options.serial, ['rm', res.dest])
+        .timeout(10000)
+        .then(function(out) {
+          return streamutil.readAll(out)
+        })
+        .return(res)
+    }
+
+    function installResource(res) {
+      return adb.push(options.serial, res.src, res.dest, res.mode)
+        .timeout(10000)
+        .then(function(transfer) {
+          return new Promise(function(resolve, reject) {
+            transfer.on('error', reject)
+            transfer.on('end', resolve)
+          })
+        })
+        .return(res)
+    }
+
+    function installAll() {
+      return Promise.all([
+        removeResource(resources.bin).then(installResource)
+      , removeResource(resources.lib).then(installResource)
+      ])
+    }
+
+    function stop() {
+      return devutil.killProcsByComm(
+          adb
+        , options.serial
+        , resources.bin.comm
+        , resources.bin.dest
+        )
+        .timeout(15000)
+    }
+
+    return stop()
+      .then(installAll)
+      .then(function() {
+        return {
+          bin: resources.bin.dest
+        , lib: resources.lib.dest
+        }
+      })
+  })