1 files changed, 50 insertions, 0 deletions
diff --git a/app/scripts/lib/stream-provider.js b/app/scripts/lib/stream-provider.js
new file mode 100644
index 000000000..3e7f443c8
--- /dev/null
+++ b/app/scripts/lib/stream-provider.js
@@ -0,0 +1,50 @@
+const Duplex = require('readable-stream').Duplex
+const inherits = require('util').inherits
+
+module.exports = StreamProvider
+
+
+inherits(StreamProvider, Duplex)
+
+function StreamProvider(){
+  Duplex.call(this, {
+    objectMode: true,
+  })
+
+  this._handlers = {}
+}
+
+// public
+
+StreamProvider.prototype.send = function(payload){
+  throw new Error('StreamProvider - does not support synchronous RPC calls')
+}
+
+StreamProvider.prototype.sendAsync = function(payload, callback){
+//   console.log('StreamProvider - sending payload', payload)
+  this._handlers[payload.id] = callback
+  this.push(payload)
+}
+
+// private
+
+StreamProvider.prototype._onResponse = function(payload){
+//   console.log('StreamProvider - got response', payload)
+  var callback = this._handlers[payload.id]
+  if (!callback) throw new Error('StreamProvider - Unknown response id')
+  delete this._handlers[payload.id]
+  callback(null, payload)
+}
+
+// stream plumbing
+
+StreamProvider.prototype._read = noop
+
+StreamProvider.prototype._write = function(msg, encoding, cb){
+  this._onResponse(msg)
+  cb()
+}
+
+// util
+
+function noop(){}
+\ No newline at end of file