Use gin as HTTP server framework

deps/github.com/gin-contrib/sse/.travis.yml

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+language: go
+sudo: false
+go:
+  - 1.6.4
+  - 1.7.4
+  - tip
+
+git:
+  depth: 3
+
+script:
+  - go test -v -covermode=count -coverprofile=coverage.out
+
+after_success:
+  - bash <(curl -s https://codecov.io/bash)

deps/github.com/gin-contrib/sse/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2014 Manuel Martínez-Almeida
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

deps/github.com/gin-contrib/sse/README.md

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+# Server-Sent Events
+
+[![GoDoc](https://godoc.org/github.com/gin-contrib/sse?status.svg)](https://godoc.org/github.com/gin-contrib/sse)
+[![Build Status](https://travis-ci.org/gin-contrib/sse.svg)](https://travis-ci.org/gin-contrib/sse)
+[![codecov](https://codecov.io/gh/gin-contrib/sse/branch/master/graph/badge.svg)](https://codecov.io/gh/gin-contrib/sse)
+[![Go Report Card](https://goreportcard.com/badge/github.com/gin-contrib/sse)](https://goreportcard.com/report/github.com/gin-contrib/sse)
+
+Server-sent events (SSE) is a technology where a browser receives automatic updates from a server via HTTP connection. The Server-Sent Events EventSource API is [standardized as part of HTML5[1] by the W3C](http://www.w3.org/TR/2009/WD-eventsource-20091029/).
+
+- [Read this great SSE introduction by the HTML5Rocks guys](http://www.html5rocks.com/en/tutorials/eventsource/basics/)
+- [Browser support](http://caniuse.com/#feat=eventsource)
+
+## Sample code
+
+```go
+import "github.com/gin-contrib/sse"
+
+func httpHandler(w http.ResponseWriter, req *http.Request) {
+	// data can be a primitive like a string, an integer or a float
+	sse.Encode(w, sse.Event{
+		Event: "message",
+		Data:  "some data\nmore data",
+	})
+
+	// also a complex type, like a map, a struct or a slice
+	sse.Encode(w, sse.Event{
+		Id:    "124",
+		Event: "message",
+		Data: map[string]interface{}{
+			"user":    "manu",
+			"date":    time.Now().Unix(),
+			"content": "hi!",
+		},
+	})
+}
+```
+```
+event: message
+data: some data\\nmore data
+
+id: 124
+event: message
+data: {"content":"hi!","date":1431540810,"user":"manu"}
+
+```
+
+## Content-Type
+
+```go
+fmt.Println(sse.ContentType)
+```
+```
+text/event-stream
+```
+
+## Decoding support
+
+There is a client-side implementation of SSE coming soon.

deps/github.com/gin-contrib/sse/sse-decoder.go

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+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package sse
+
+import (
+	"bytes"
+	"io"
+	"io/ioutil"
+)
+
+type decoder struct {
+	events []Event
+}
+
+func Decode(r io.Reader) ([]Event, error) {
+	var dec decoder
+	return dec.decode(r)
+}
+
+func (d *decoder) dispatchEvent(event Event, data string) {
+	dataLength := len(data)
+	if dataLength > 0 {
+		//If the data buffer's last character is a U+000A LINE FEED (LF) character, then remove the last character from the data buffer.
+		data = data[:dataLength-1]
+		dataLength--
+	}
+	if dataLength == 0 && event.Event == "" {
+		return
+	}
+	if event.Event == "" {
+		event.Event = "message"
+	}
+	event.Data = data
+	d.events = append(d.events, event)
+}
+
+func (d *decoder) decode(r io.Reader) ([]Event, error) {
+	buf, err := ioutil.ReadAll(r)
+	if err != nil {
+		return nil, err
+	}
+
+	var currentEvent Event
+	var dataBuffer *bytes.Buffer = new(bytes.Buffer)
+	// TODO (and unit tests)
+	// Lines must be separated by either a U+000D CARRIAGE RETURN U+000A LINE FEED (CRLF) character pair,
+	// a single U+000A LINE FEED (LF) character,
+	// or a single U+000D CARRIAGE RETURN (CR) character.
+	lines := bytes.Split(buf, []byte{'\n'})
+	for _, line := range lines {
+		if len(line) == 0 {
+			// If the line is empty (a blank line). Dispatch the event.
+			d.dispatchEvent(currentEvent, dataBuffer.String())
+
+			// reset current event and data buffer
+			currentEvent = Event{}
+			dataBuffer.Reset()
+			continue
+		}
+		if line[0] == byte(':') {
+			// If the line starts with a U+003A COLON character (:), ignore the line.
+			continue
+		}
+
+		var field, value []byte
+		colonIndex := bytes.IndexRune(line, ':')
+		if colonIndex != -1 {
+			// If the line contains a U+003A COLON character character (:)
+			// Collect the characters on the line before the first U+003A COLON character (:),
+			// and let field be that string.
+			field = line[:colonIndex]
+			// Collect the characters on the line after the first U+003A COLON character (:),
+			// and let value be that string.
+			value = line[colonIndex+1:]
+			// If value starts with a single U+0020 SPACE character, remove it from value.
+			if len(value) > 0 && value[0] == ' ' {
+				value = value[1:]
+			}
+		} else {
+			// Otherwise, the string is not empty but does not contain a U+003A COLON character character (:)
+			// Use the whole line as the field name, and the empty string as the field value.
+			field = line
+			value = []byte{}
+		}
+		// The steps to process the field given a field name and a field value depend on the field name,
+		// as given in the following list. Field names must be compared literally,
+		// with no case folding performed.
+		switch string(field) {
+		case "event":
+			// Set the event name buffer to field value.
+			currentEvent.Event = string(value)
+		case "id":
+			// Set the event stream's last event ID to the field value.
+			currentEvent.Id = string(value)
+		case "retry":
+			// If the field value consists of only characters in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9),
+			// then interpret the field value as an integer in base ten, and set the event stream's reconnection time to that integer.
+			// Otherwise, ignore the field.
+			currentEvent.Id = string(value)
+		case "data":
+			// Append the field value to the data buffer,
+			dataBuffer.Write(value)
+			// then append a single U+000A LINE FEED (LF) character to the data buffer.
+			dataBuffer.WriteString("\n")
+		default:
+			//Otherwise. The field is ignored.
+			continue
+		}
+	}
+	// Once the end of the file is reached, the user agent must dispatch the event one final time.
+	d.dispatchEvent(currentEvent, dataBuffer.String())
+
+	return d.events, nil
+}

deps/github.com/gin-contrib/sse/sse-decoder_test.go

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+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package sse
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDecodeSingle1(t *testing.T) {
+	events, err := Decode(bytes.NewBufferString(
+		`data: this is a text
+event: message
+fake:
+id: 123456789010
+: we can append data
+: and multiple comments should not break it
+data: a very nice one`))
+
+	assert.NoError(t, err)
+	assert.Len(t, events, 1)
+	assert.Equal(t, events[0].Event, "message")
+	assert.Equal(t, events[0].Id, "123456789010")
+}
+
+func TestDecodeSingle2(t *testing.T) {
+	events, err := Decode(bytes.NewBufferString(
+		`: starting with a comment
+fake:
+
+data:this is a \ntext
+event:a message\n\n
+fake
+:and multiple comments\n should not break it\n\n
+id:1234567890\n10
+:we can append data
+data:a very nice one\n!
+
+
+`))
+	assert.NoError(t, err)
+	assert.Len(t, events, 1)
+	assert.Equal(t, events[0].Event, "a message\\n\\n")
+	assert.Equal(t, events[0].Id, "1234567890\\n10")
+}
+
+func TestDecodeSingle3(t *testing.T) {
+	events, err := Decode(bytes.NewBufferString(
+		`
+id:123456ABCabc789010
+event: message123
+: we can append data
+data:this is a text
+data: a very nice one
+data:
+data
+: ending with a comment`))
+
+	assert.NoError(t, err)
+	assert.Len(t, events, 1)
+	assert.Equal(t, events[0].Event, "message123")
+	assert.Equal(t, events[0].Id, "123456ABCabc789010")
+}
+
+func TestDecodeMulti1(t *testing.T) {
+	events, err := Decode(bytes.NewBufferString(
+		`
+id:
+event: weird event
+data:this is a text
+:data: this should NOT APER
+data:  second line
+
+: a comment
+event: message
+id:123
+data:this is a text
+:data: this should NOT APER
+data:  second line
+
+
+: a comment
+event: message
+id:123
+data:this is a text
+data:  second line
+
+:hola
+
+data
+
+event:
+
+id`))
+	assert.NoError(t, err)
+	assert.Len(t, events, 3)
+	assert.Equal(t, events[0].Event, "weird event")
+	assert.Equal(t, events[0].Id, "")
+}
+
+func TestDecodeW3C(t *testing.T) {
+	events, err := Decode(bytes.NewBufferString(
+		`data
+
+data
+data
+
+data:
+`))
+	assert.NoError(t, err)
+	assert.Len(t, events, 1)
+}