idgen.ID is an unsiged 64-bit pseudo unique ID consisting of a 42-bit Unix timestamp (in ms), a node ID (8 bits) and a sequence number (14 bits). Timestamp is placed first so that IDs generated are (roughly) sortable on creation. It is designed to support up to 256 nodes, and 16384 IDs unique within a millisecond.
The program is single-threaded, but is fast enough to generate 1 million IDs under a second when tested locally (2014 MBP).
Download and place this project under your $GOPATH.
$GOPATH/src/github.com/microamp/idgen
go build ./...
stretchr/testify is required to run the tests.
go get -u github.com/stretchr/testify
Then,
go test ./idgen/...
cmd/test_simple/test_simple.go demonstrates how idgen.ID can be generated. e.g.
go run cmd/test_simple/test_simple.go