Typed Go contracts and explicit runtime integration

go install github.com/Voskan/BatchWeaver/cmd/batchweaver@v1.0.1
go get github.com/Voskan/BatchWeaver@v1.0.1

package users

import (
    "context"

    batchweaver "github.com/Voskan/BatchWeaver"
    "github.com/Voskan/BatchWeaver/operation"
)

type User struct { ID int; Name string }

func loadUser(ctx context.Context, id int) (User, error) {
    return User{ID: id}, nil
}

func loadUsers(
    ctx context.Context,
    req batchweaver.BatchRequest[int],
) (batchweaver.BatchResponse[User], error) {
    values := make([]User, req.Len())
    for i, item := range req.Items() {
        values[i] = User{ID: item.Key}
    }
    return batchweaver.OrderedOutcomes(req, values)
}

var GetUser = batchweaver.MustDeclareFunction(
    operation.MustNewSpec(
        operation.MustParseID("users.get"),
        operation.ReadOnly(),
        operation.WithOrderedResults(),
        operation.WithRequestScope(),
    ),
    loadUser,
    loadUsers,
)