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Most of the complexity in the previous version was about managing the
child worker processes. With OCaml 5 this all goes away, and we just
use multiple domains instead.

Notes:

- opam is not thread-safe, so we need a lock around all opam file
  parsing operations. See ocaml/opam#5591

- We now load opam files lazily, which makes testing much faster.
  This reduces the time for `stress/stress.exe` from 97.4s to 11.5s for
  me.

- Epoch_lock is gone. It was just for managing sub-processes, but a
  simple Eio.Mutex.t will do now. This should also be much faster when
  switching between opam-repository commits.

- The main executable is now in the `bin` directory. Simplifies the dune
  file.

- test_service.ml is gone. It was only testing parsing of the
  communications between parent and child processes, which no longer
  exist. This also removed the need to functorise over opam repository.

- Default to `recommended_domain_count - 1` workers.

- Removed uses of (non-threadsafe) Str module.

- The `--sockpath` option is gone. You could already use
  `--address=unix:...` anyway.

- Move license to a separate file.

- OCluster support no longer exports host metrics. That was just a quick
  hack for monitoring, but should really be a separate service.

TODO:

- Reinit Git_unix after pulling. Otherwise, it doesn't notice the new
  commits.

- Add full stress test (i.e. solving for many packages over many hours).
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talex5 committed Jul 6, 2023
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5 changes: 4 additions & 1 deletion .gitmodules
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[submodule "ocaml-dockerfile"]
path = ocaml-dockerfile
url = https://github.com/ocurrent/ocaml-dockerfile.git
branch = master
branch = master
[submodule "opam-0install-solver"]
path = opam-0install-solver
url = https://github.com/ocaml-opam/opam-0install-solver.git
191 changes: 191 additions & 0 deletions LICENSE
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25 changes: 13 additions & 12 deletions README.md
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# Solver Service

*Status: WIP & Experimental*

A standalone, OCurrent service for solving opam dependencies extracted and modified from [OCaml-CI](https://github.com/ocurrent/ocaml-ci). This repostory contains:

- `src/solver-service-api`: The Capnp solver service API, the defines the format for sending requests and receiving responses from a service.
- `src/solver-service`: The core functionality of completing a solver request using `opam-0install` is contained here. There are binaries for running a `solver-service` which can communicate over `stdin/stdout` or over the network.
- `src/solver-service`: The core functionality of completing a solver request using `opam-0install` is contained here. There are binaries for running a `solver-service` which can communicate over `stdin` or over the network.
- `src/solver-worker`: An OCluster worker that can solve requests being submitted to OCluster as a custom job specification.

## Example

### A solver service

The `./examples` directory contains a small CLI tool for testing the solver service over a TCP connection. It requires a package name and version to solve for (note it will use `opam` to fetch the opam file information). To test it, you first must install and run the solver service. It spawns workers by recursively calling itself (using `Sys.argv.(0)`) so it is important to run it using its proper name rather than with `dune exec --`.
The `./examples` directory contains a small CLI tool for testing the solver service over a TCP connection. It requires a package name and version to solve for (note it will use `opam` to fetch the opam file information). To test it, you first must install and run the solver service.

```sh
$ solver-service --address=tcp:127.0.0.1:7000
Solver service running at: <capnp-address>
$ mkdir capnp-secrets
$ solver-service run-service \
--capnp-secret-key-file=server.pem \
--capnp-listen-address=tcp:127.0.0.1:7000 \
--cap-file=./capnp-secrets/solver.cap
Wrote solver service's address to "./capnp-secrets/solver.cap"
```
Copy the `<capnp-address>` and run the example binary passing in the address.
Then run the example client to test it:
```sh
$ dune exec -- ./examples/main.exe --package=yaml --version=3.0.0 <capnp-address>
$ dune exec -- ./examples/main.exe --package=yaml --version=3.0.0 ./capnp-secrets/solver.cap
```
### A solver worker
### An OCluster worker
The solver worker can join an existing pool on a scheduler and solve request jobs sent as a custom job type. The example [`submit.ml`](examples/submit.ml) will send such a job to a scheduler (you need to supply the submission cap file).
To try this example locally, first get the scheduler up and running.
```
$ mkdir capnp-secrets
$ ocluster-scheduler --capnp-secret-key-file=capnp-secrets/key.cap --capnp-listen-address=tcp:127.0.0.1:9000 --pools=solver --state-dir=var --default-clients=demo --verbosity=info
$ ocluster-scheduler --capnp-secret-key-file=capnp-secrets/scheduler-key.cap --capnp-listen-address=tcp:127.0.0.1:9000 --pools=solver --state-dir=var --default-clients=demo --verbosity=info
```
This will write a `submit-demo.cap` file into `capnp-secrets`.
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With this running we can use the example submission pipeline to solve the dependencies for the [obuilder](https://github.com/ocurrent/obuilder) repository on Github.
```
$ dune exec -- examples/submit.exe --submission-service=capnp-secrets/submit-demo.cap -v
$ dune exec -- solver-service run-cluster --connect=capnp-secrets/pool-solver.cap --name=solver-1 --verbosity=info
```
You should then be able to watch the pipeline in action at `http://localhost:8080`.
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(executable
(name main)
(package solver-service)
(public_name solver-service)
(preprocess
(pps ppx_deriving.std ppx_deriving_yojson))
(libraries solver-service solver-worker logs.cli capnp-rpc-unix eio_main dune-build-info logs.fmt logs.threaded fmt.cli fmt.tty))
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