49 lines
2.3 KiB
Markdown
49 lines
2.3 KiB
Markdown
# UUID or else
|
|
|
|
There are many use cases where we need to use a unique ID.
|
|
In my experience, I only encouter 2 cases:
|
|
|
|
- ID to trace request from client to server, from service to service (microservice architecture or nanoservice I don't know).
|
|
- Primary key for database.
|
|
|
|
In my Go universe, there are some libs to help us with this:
|
|
|
|
- [google/uuid](https://github.com/google/uuid)
|
|
- [rs/xid](https://github.com/rs/xid)
|
|
- [segmentio/ksuid](https://github.com/segmentio/ksuid)
|
|
- [oklog/ulid](https://github.com/oklog/ulid)
|
|
|
|
## First use case is trace ID, or context aware ID
|
|
|
|
The ID is used only for trace and log.
|
|
If same ID is generated twice (because maybe the possibilty is too small but not 0), honestly I don't care.
|
|
When I use that ID to search log , if it pops more than things I care for, it is still no harm to me.
|
|
|
|
My choice for this use case is **rs/xid**.
|
|
Because it is small (not span too much on log line) and copy friendly.
|
|
|
|
## Second use case is primary key, also hard choice
|
|
|
|
Why I don't use auto increment key for primary key?
|
|
The answer is simple, I don't want to write database specific SQL.
|
|
SQLite has some different syntax from MySQL, and PostgreSQL and so on.
|
|
Every logic I can move to application layer from database layer, I will.
|
|
|
|
In the past and present, I use **google/uuid**, specificially I use UUID v4.
|
|
In the future I will look to use **segmentio/ksuid** and **oklog/ulid** (trial and error of course).
|
|
Both are sortable, but **google/uuid** is not.
|
|
The reason I'm afraid because the database is sensitive subject, and I need more testing and battle test proof to trust those libs.
|
|
|
|
## What else?
|
|
|
|
I think about adding prefix to ID to identify which resource that ID represents.
|
|
|
|
## Thanks
|
|
|
|
- [UUID, SERIAL OR IDENTITY COLUMNS FOR POSTGRESQL AUTO-GENERATED PRIMARY KEYS?](https://www.cybertec-postgresql.com/en/uuid-serial-or-identity-columns-for-postgresql-auto-generated-primary-keys/)
|
|
- [Identity Crisis: Sequence v. UUID as Primary Key](https://brandur.org/nanoglyphs/026-ids)
|
|
- [Generating good unique ids in Go](https://blog.kowalczyk.info/article/JyRZ/generating-good-unique-ids-in-go.html)
|
|
- [How we used Go 1.18 when designing our Identifiers](https://encore.dev/blog/go-1.18-generic-identifiers)
|
|
- [ULIDs and Primary Keys](https://blog.daveallie.com/ulid-primary-keys)
|
|
- [On IDs](https://0pointer.net/blog/projects/ids.html)
|