mirror of https://github.com/pulumi/pulumi.git
7422c44ca4
<!--- Thanks so much for your contribution! If this is your first time contributing, please ensure that you have read the [CONTRIBUTING](https://github.com/pulumi/pulumi/blob/master/CONTRIBUTING.md) documentation. --> # Description <!--- Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. --> This adds support to the engine for "remote transformations". A transform is "remote" because it is being invoked via the engine on receiving a resource registration, rather than being ran locally in process before sending a resource registration. These transforms can also span multiple process boundaries, e.g. a transform function in a user program, then a transform function in a component library, both running for a resource registered by another component library. The underlying new feature here is the idea of a `Callback`. The expectation is we're going to use callbacks for multiple features so these are _not_ defined in terms of transformations. A callback is an untyped byte array (usually will be a protobuf message), plus an address to define which server should be invoked to do the callback, and a token to identify it. A language sdk can start up and serve a `Callbacks` service, keep a mapping of tokens to in-process functions (currently just using UUID's for this), and then pass that service address and token to the engine to be invoked later on. The engine uses these callbacks to track transformations callbacks per resource, and on a new resource registrations invokes each relevant callback with the resource properties and options, having new properties and options returned that are then passed to the next relevant transform callback until all have been called and the engine has the final resource state and options to use. ## Checklist - [x] I have run `make tidy` to update any new dependencies - [x] I have run `make lint` to verify my code passes the lint check - [x] I have formatted my code using `gofumpt` <!--- Please provide details if the checkbox below is to be left unchecked. --> - [x] I have added tests that prove my fix is effective or that my feature works <!--- User-facing changes require a CHANGELOG entry. --> - [x] I have run `make changelog` and committed the `changelog/pending/<file>` documenting my change <!-- If the change(s) in this PR is a modification of an existing call to the Pulumi Cloud, then the service should honor older versions of the CLI where this change would not exist. You must then bump the API version in /pkg/backend/httpstate/client/api.go, as well as add it to the service. --> - [ ] Yes, there are changes in this PR that warrants bumping the Pulumi Cloud API version <!-- @Pulumi employees: If yes, you must submit corresponding changes in the service repo. --> |
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