oguimbal
Prisma support
Just curious if you are still working on this lib and if this might come anyday?
I asked on slack and it seems that prisma does not use pg. Is it possible to mock through a connection uri?
Not a problem... pg-mem is not specific to the pg library. As long as Prisma is issuing PosgreSQL queries, it should be okay.
The only thing that must be done is to replace whatever lib is used to send the requests, and redirect those SQL queries to pg-mem. I havent had the time to investigate how to do that with Prisma yet, but it could be simple. For instance, here is how the Slonik adapter is written, for instance (all supported libraries adapters are in this file). It is not possible to simply use a connection uri, since pg-mem does not listen to network requests, though.
... Once this is done, there also is a possibility that prisma will issue unsupported requests (such as cross joins), in which case I'll have to implement what's needed.
It seems that integration with Prisma would be easy if pg-mem would run a server and expose a url that can be fed to prisma 🤔
Yup. I looked a bit into prisma, and it turns out that SQL queries are issued by Rust. (I didnt know Prisma was written in Rust !).
(node) prisma -> (rust) prisma-engines -> (rust) quaint -> postgres statements (via tokio-postgres)
So yes, it will be a bit invasive to try to hook quaint to execute pg-mem back in node.
I'm looking into implementing a fake postgres server. It would essentially look like the other side of the mirror of pg-protocol, or more specifically for the rust version, this.... admittedly, it will be a more general solution to plug other libs/frameworks to pg-mem, but I was hoping not to implement such a low level solution 😑
For the record, to solve this, I've started working on pg-server, a library that can fake a postgres database. I'm working on integrating it with pg-mem, which requires some refactoring to do things right.
Once this is done, it will be possible to expose a pg-mem instance via a random network port like any regular pg database. This will have the advantage of being compatible with any library (or any other tool, for that matter), but will add a network overhead.
I'll keep you posted when it is finished😁
The fun in all this is that pg-server is actually much more versatile that just a network interface to pg-mem... you could use it as a a db honeypot, a proxy which intercepts/inspects/modifies postgres requests on the fly (it works quite well in conjunction with pgsql-ast-parser, the syntax parser of pg-mem), or whatever !
This is super exciting! Let me know if you would like me to try a beta build of the library with my codebase (it's relatively small but has some more complex operations)
In case you want to try out, if Prisma Client would work with pg-mem, you can try out our integration tests in https://github.com/prisma/prisma/tree/master/src/packages/tests
We also have a more extensive test suite written in Scala we use for Rust, but this one written in TypeScript should already get you quite far.
Normally we run them with this docker-compose file: https://github.com/prisma/prisma/blob/master/src/docker/docker-compose.yml
You should "just" need to provide the env var TEST_POSTGRES_URI to point to your pg-mem instance and then in ./src/packages/tests you can do yarn test:postgresql
Hi, nothing new... I've worked on the refactoring I mentioned, but I've had a rough month at work, so I couldnt finish it yet.
Sorry 😶
This is definitely still in my pipe, though ! But I cant give you an ETA right now, unfortunately.
Sorry to bump, but what's the status? Really want pg-mem integration for prisma.
I'm also interested in this. Typically in integration tests in services using MongoDB, I use https://www.npmjs.com/package/mongodb-memory-server which allows connecting by URI. Having an in-memory postgres server would enable me to write quality tests for Prisma easily.
Hi ! I had very little time to work on pg-mem last year, but that's changing, and Prisma support is one of the the two most important issues for me.
A milestone has been recently reached in the refactoring that will allow this, so hopefully I will find time to get that working in the upcoming few months 🤷♂️
+1, I think it's the most promising solution for in memory database working with Prisma
I've just started working on a fork to work with Prisma, but happy to collaborate!
Small update from the Prisma side: https://github.com/prisma/prisma/issues/5419#issuecomment-1589665551
Does pg-mem expose any kind of URL for integrating w/ Prisma? I tried looking into pg-server but it hasn't been updated in a while.
