✨ use vgo

vendor/github.com/sony/sonyflake/.gitignore

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+example/sonyflake_server

vendor/github.com/sony/sonyflake/.travis.yml

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+language: go
+go:
+  - 1.10.x
+  - 1.11.x
+sudo: false
+before_install:
+  - go get -u golang.org/x/lint/golint
+  - go get github.com/axw/gocov/gocov
+  - go get github.com/mattn/goveralls
+script:
+  - test -z "`gofmt -l .`"
+  - test -z "`golint ./...`"
+  - $GOPATH/bin/goveralls -service=travis-ci
+  - cd example && ./linux64_build.sh

vendor/github.com/sony/sonyflake/README.md

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+Sonyflake
+=========
+
+[![GoDoc](https://godoc.org/github.com/sony/sonyflake?status.svg)](http://godoc.org/github.com/sony/sonyflake)
+[![Build Status](https://travis-ci.org/sony/sonyflake.svg?branch=master)](https://travis-ci.org/sony/sonyflake)
+[![Coverage Status](https://coveralls.io/repos/sony/sonyflake/badge.svg?branch=master&service=github)](https://coveralls.io/github/sony/sonyflake?branch=master)
+[![Go Report Card](https://goreportcard.com/badge/github.com/sony/sonyflake)](https://goreportcard.com/report/github.com/sony/sonyflake)
+
+Sonyflake is a distributed unique ID generator inspired by [Twitter's Snowflake](https://blog.twitter.com/2010/announcing-snowflake).  
+A Sonyflake ID is composed of
+
+    39 bits for time in units of 10 msec
+     8 bits for a sequence number
+    16 bits for a machine id
+
+Installation
+------------
+
+```
+go get github.com/sony/sonyflake
+```
+
+Usage
+-----
+
+The function NewSonyflake creates a new Sonyflake instance.
+
+```go
+func NewSonyflake(st Settings) *Sonyflake
+```
+
+You can configure Sonyflake by the struct Settings:
+
+```go
+type Settings struct {
+	StartTime      time.Time
+	MachineID      func() (uint16, error)
+	CheckMachineID func(uint16) bool
+}
+```
+
+- StartTime is the time since which the Sonyflake time is defined as the elapsed time.
+  If StartTime is 0, the start time of the Sonyflake is set to "2014-09-01 00:00:00 +0000 UTC".
+  If StartTime is ahead of the current time, Sonyflake is not created.
+
+- MachineID returns the unique ID of the Sonyflake instance.
+  If MachineID returns an error, Sonyflake is not created.
+  If MachineID is nil, default MachineID is used.
+  Default MachineID returns the lower 16 bits of the private IP address.
+
+- CheckMachineID validates the uniqueness of the machine ID.
+  If CheckMachineID returns false, Sonyflake is not created.
+  If CheckMachineID is nil, no validation is done.
+
+In order to get a new unique ID, you just have to call the method NextID.
+
+```go
+func (sf *Sonyflake) NextID() (uint64, error)
+```
+
+NextID can continue to generate IDs for about 174 years from StartTime.
+But after the Sonyflake time is over the limit, NextID returns an error.
+
+AWS VPC and Docker
+------------------
+
+The [awsutil](https://github.com/sony/sonyflake/blob/master/awsutil) package provides
+the function AmazonEC2MachineID that returns the lower 16-bit private IP address of the Amazon EC2 instance.
+It also works correctly on Docker
+by retrieving [instance metadata](http://docs.aws.amazon.com/en_us/AWSEC2/latest/UserGuide/ec2-instance-metadata.html).
+
+[AWS VPC](http://docs.aws.amazon.com/en_us/AmazonVPC/latest/UserGuide/VPC_Subnets.html)
+is assigned a single CIDR with a netmask between /28 and /16.
+So if each EC2 instance has a unique private IP address in AWS VPC,
+the lower 16 bits of the address is also unique.
+In this common case, you can use AmazonEC2MachineID as Settings.MachineID.
+
+See [example](https://github.com/sony/sonyflake/blob/master/example) that runs Sonyflake on AWS Elastic Beanstalk.
+
+License
+-------
+
+The MIT License (MIT)
+
+See [LICENSE](https://github.com/sony/sonyflake/blob/master/LICENSE) for details.