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backend.go
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/
backend.go
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package client
import (
"context"
"errors"
"github.com/open-policy-agent/frameworks/constraint/pkg/client/drivers"
)
type Backend struct {
driver drivers.Driver
crd *crdHelper
hasClient bool
}
type BackendOpt func(*Backend)
func Driver(d drivers.Driver) BackendOpt {
return func(b *Backend) {
b.driver = d
}
}
// NewBackend creates a new backend. A backend could be a connection to a remote server or
// a new local OPA instance.
func NewBackend(opts ...BackendOpt) (*Backend, error) {
b := &Backend{crd: newCRDHelper()}
for _, opt := range opts {
opt(b)
}
if b.driver == nil {
return nil, errors.New("No driver supplied to the backend")
}
return b, nil
}
// NewClient creates a new client for the supplied backend
func (b *Backend) NewClient(opts ...ClientOpt) (Client, error) {
if b.hasClient {
return nil, errors.New("Currently only one client per backend is supported")
}
c := &client{
backend: b,
constraints: make(map[string]*constraintEntry),
}
var errs Errors
for _, opt := range opts {
if err := opt(c); err != nil {
errs = append(errs, err)
}
}
if len(errs) > 0 {
return nil, errs
}
if len(c.targets) == 0 {
return nil, errors.New("No targets registered. Please register a target via client.Targets()")
}
if err := b.driver.Init(context.Background()); err != nil {
return nil, err
}
if err := c.init(); err != nil {
return nil, err
}
return c, nil
}