sapling/eden/mononoke/edenapi_server
Meyer Jacobs 75105421ce edenapi: Hide edenapi wire types from externally visible API
Summary:
Introduce separate wire types to allow protocol evolution and client API changes to happen independently.

* Duplicate `*Request`, `*Entry`, `Key`, `Parents`, `RepoPathBuf`, `HgId`, and `revisionstore_types::Metadata` types into the `wire` module. The versions in the `wire` module are required to have proper `serde` annotations, `Serialize` / `Deserialize` implementations, etc. These have been removed from the original structs.
* Introduce infallible conversions from "API types" to "wire types" with the `ToWire` trait and fallible conversions from "wire types" to "API types" with the `ToApi`. API -> wire conversions should never fail in a binary that builds succesfully, but wire -> API conversions can fail in the case that the server and client are using different versions of the library. This will cause, for instance, a newly-introduced enum variant used by the client to be deserialized into the catch-all `Unknown` variant on the server, which won't generally have a corresponding representation in the API type.
* Cleanup: remove `*Response` types, which are no longer used anywhere.
* Introduce a `map` method on `Fetch` struct which allows a fallible conversion function to be used to convert a `Fetch<T>` to a `Fetch<U>`. This function is used in the edenapi client implementation to convert from wire types to API types.
* Modify `edenapi_server` to convert from API types to wire types.
* Modify `edenapi_cli` to convert back to wire types before serializing responses to disk.
* Modify `make_req` to use `ToWire` for converting API structs from the `json` module to wire structs.
* Modify `read_res` to use `ToApi` to convert deserialized wire types to API types with the necessary methods for investigating the contents (`.data()`, primarily). It will print an error message to stderr if it encounters a wire type which cannot be converted into the corresponding API type.
* Add some documentation about protocol conventions to the root of the `wire` module.

Reviewed By: kulshrax

Differential Revision: D23224705

fbshipit-source-id: 88f8addc403f3a8da3cde2aeee765899a826446d
2020-09-23 17:27:08 -07:00
..
src edenapi: Hide edenapi wire types from externally visible API 2020-09-23 17:27:08 -07:00
Cargo.toml mononoke: deprecate preamble in favor of metadata 2020-09-15 10:28:38 -07:00