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fn.go
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fn.go
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package main
import (
"bytes"
"context"
providerv1alpha1 "github.com/crossplane-contrib/provider-kubernetes/apis/object/v1alpha1"
xpv1 "github.com/crossplane/crossplane-runtime/apis/common/v1"
"github.com/crossplane/crossplane-runtime/pkg/errors"
"github.com/crossplane/crossplane-runtime/pkg/logging"
fnv1beta1 "github.com/crossplane/function-sdk-go/proto/v1beta1"
"github.com/crossplane/function-sdk-go/request"
"github.com/crossplane/function-sdk-go/resource"
"github.com/crossplane/function-sdk-go/resource/composed"
"github.com/crossplane/function-sdk-go/response"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/serializer/json"
"k8s.io/client-go/kubernetes/scheme"
"github.com/st3v/servicebinding-decorator/input/v1alpha1"
)
// Function returns whatever response you ask it to.
type Function struct {
fnv1beta1.UnimplementedFunctionRunnerServiceServer
log logging.Logger
}
func init() {
if err := providerv1alpha1.SchemeBuilder.AddToScheme(composed.Scheme); err != nil {
panic(err)
}
}
// RunFunction runs the Function.
func (f *Function) RunFunction(_ context.Context, req *fnv1beta1.RunFunctionRequest) (*fnv1beta1.RunFunctionResponse, error) {
f.log = f.log.WithValues(
req.GetMeta().GetTag(),
)
f.log.Info("Running Servicebinding Decorator", "tag")
rsp := response.To(req, response.DefaultTTL)
oxr, err := request.GetObservedCompositeResource(req)
if err != nil {
response.Fatal(rsp, errors.Wrapf(err, "cannot get observed composite resource from %T", req))
return rsp, nil
}
f.log = f.log.WithValues(
"xr-apiversion", oxr.Resource.GetAPIVersion(),
"xr-kind", oxr.Resource.GetKind(),
"xr-name", oxr.Resource.GetName(),
)
decorator := &v1alpha1.Decorator{}
if err := request.GetInput(req, decorator); err != nil {
response.Fatal(rsp, errors.Wrapf(err, "cannot get Function input from %T", req))
return rsp, nil
}
claim := oxr.Resource.GetClaimReference()
if claim == nil {
response.Normal(rsp, "claim reference is nil, nothing to do")
return rsp, nil
}
connSecretRef := oxr.Resource.GetWriteConnectionSecretToReference()
if connSecretRef != nil && connSecretRef.Namespace == claim.Namespace {
// looks like the claim specified a secret to write the connection details to
// and that secret is in the same namespace as the claim
// we can just refer to that secret
return setStatusBindingName(connSecretRef.Name, req, rsp), nil
}
// do we require the claim to specify a secret to write the connection details to?
if decorator.Config.RequireWriteConnectionSecretToRef {
// note, we do not treat this as an error, the claim is simply not bindable in this case
response.Normal(rsp, "claim does not specify spec.writeConnectionSecretToRef, nothing to do")
return rsp, nil
}
observed, err := request.GetObservedComposedResources(req)
if err != nil {
response.Fatal(rsp, errors.Wrapf(err, "cannot get observed composed resources from %T", req))
return rsp, nil
}
connectionDetails := map[string][]byte{}
for _, ocr := range observed {
for k, v := range ocr.ConnectionDetails {
connectionDetails[k] = v
}
}
for k, v := range decorator.Config.BindingSecretOverrides {
connectionDetails[k] = []byte(v)
}
// the claim didn't specify a secret to write the connection details to
// but we also don't require it to do so, rather it's up to us to create a secret now
// we can't do this by setting spec.writeConnectionSecretToRef on the XR though as we are
// only allowed to mutate the XR's status, not its spec
// so instead we compose a new secret and created it using provider-kubernetes
secret := corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: string(oxr.Resource.GetUID()),
Namespace: claim.Namespace,
},
Data: connectionDetails,
}
providerConfigName := "default"
if decorator.Config.ProviderConfigRef != nil && decorator.Config.ProviderConfigRef.Name != "" {
providerConfigName = decorator.Config.ProviderConfigRef.Name
}
enc := scheme.Codecs.EncoderForVersion(&json.Serializer{}, corev1.SchemeGroupVersion)
buffer := &bytes.Buffer{}
if err := enc.Encode(&secret, buffer); err != nil {
response.Fatal(rsp, errors.Wrapf(err, "cannot encode secret %T", secret))
return rsp, nil
}
// the provider-kubernetes object for the secret
object := providerv1alpha1.Object{
Spec: providerv1alpha1.ObjectSpec{
ForProvider: providerv1alpha1.ObjectParameters{
Manifest: runtime.RawExtension{
Raw: buffer.Bytes(),
},
},
ResourceSpec: providerv1alpha1.ResourceSpec{
ProviderConfigReference: &xpv1.Reference{
Name: providerConfigName,
},
},
},
}
desiredComposed, err := request.GetDesiredComposedResources(req)
if err != nil {
response.Fatal(rsp, errors.Wrapf(err, "cannot get desired composed resources from %T", req))
return rsp, nil
}
composed, err := composed.From(&object)
if err != nil {
response.Fatal(rsp, errors.Wrapf(err, "cannot get composed resource from %T", object))
return rsp, nil
}
desiredComposed["bindingsecret"] = &resource.DesiredComposed{Resource: composed}
if err := response.SetDesiredComposedResources(rsp, desiredComposed); err != nil {
response.Fatal(rsp, errors.Wrapf(err, "cannot set desired composed resources in %T", rsp))
return rsp, nil
}
return setStatusBindingName(secret.Name, req, rsp), nil
}
// setStatusBindingName attempts to set status.binding.name on the desired composite in the response
// if this fails, the function adds a fatal result to the response
func setStatusBindingName(secretName string, req *fnv1beta1.RunFunctionRequest, rsp *fnv1beta1.RunFunctionResponse) *fnv1beta1.RunFunctionResponse {
desiredComposite, err := request.GetDesiredCompositeResource(req)
if err != nil {
response.Fatal(rsp, errors.Wrapf(err, "cannot get desired composite resource from %T", req))
return rsp
}
if err := desiredComposite.Resource.SetString("status.binding.name", secretName); err != nil {
response.Fatal(rsp, errors.Wrapf(err, "cannot set desired composite resource in %T", req))
return rsp
}
if err := response.SetDesiredCompositeResource(rsp, desiredComposite); err != nil {
response.Fatal(rsp, errors.Wrapf(err, "cannot set desired composite resource in %T", rsp))
}
return rsp
}