/
post_renderer.go
116 lines (100 loc) · 3.88 KB
/
post_renderer.go
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package helmworkload
import (
"bytes"
"encoding/json"
"fmt"
"gorm.io/datatypes"
"helm.sh/helm/v3/pkg/releaseutil"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
yamlserailizer "k8s.io/apimachinery/pkg/runtime/serializer/yaml"
"sigs.k8s.io/yaml"
"github.com/threeport/threeport/internal/agent"
v0 "github.com/threeport/threeport/pkg/api/v0"
kube "github.com/threeport/threeport/pkg/kube/v0"
util "github.com/threeport/threeport/pkg/util/v0"
)
// ThreeportPostRenderer implements the postrender.PostRenderer interface for
// Threeport purposes.
type ThreeportPostRenderer struct {
HelmWorkloadDefinition *v0.HelmWorkloadDefinition
HelmWorkloadInstance *v0.HelmWorkloadInstance
}
// Run modifies the redndered manifests to add threeport labels that allow the
// threeport agent to monitor the workload.
func (p *ThreeportPostRenderer) Run(renderedManifests *bytes.Buffer) (*bytes.Buffer, error) {
splitManifests := releaseutil.SplitManifests(renderedManifests.String())
var postRenderedManifests string
for _, manifest := range splitManifests {
// convert to unstructured kube object
serializer := yamlserailizer.NewDecodingSerializer(unstructured.UnstructuredJSONScheme)
kubeObject := &unstructured.Unstructured{}
_, _, err := serializer.Decode([]byte(manifest), nil, kubeObject)
if err != nil {
return nil, fmt.Errorf("failed to decode YAML manifest to unstructured object: %w", err)
}
// set label metadata on object to signal threeport agent
kubeObject, err = kube.AddLabels(
kubeObject,
*p.HelmWorkloadDefinition.Name,
*p.HelmWorkloadInstance.Name,
*p.HelmWorkloadInstance.ID,
agent.HelmWorkloadInstanceLabelKey,
)
if err != nil {
return nil, fmt.Errorf("failed to add label metadata in post rendering: %w", err)
}
// convert unstructured kube object back to yaml
yamlBytes, err := yaml.Marshal(kubeObject)
if err != nil {
return nil, fmt.Errorf("failed to convert unstructured object back to YAML: %w", err)
}
// add to post-rendered manifests
postRenderedManifests += "---\n"
postRenderedManifests += string(yamlBytes)
}
// append additional resources to post-rendered manifests
// from helm workload definition
postRenderedManifests, err := p.AppendAdditionalResources(
postRenderedManifests,
p.HelmWorkloadDefinition.AdditionalResources,
)
if err != nil {
return nil, fmt.Errorf("failed to append additional resources from helm workload definition: %w", err)
}
// append additional resources to post-rendered manifests
// from helm workload instance
postRenderedManifests, err = p.AppendAdditionalResources(
postRenderedManifests,
p.HelmWorkloadInstance.AdditionalResources,
)
if err != nil {
return nil, fmt.Errorf("failed to append additional resources from helm workload instance: %w", err)
}
return bytes.NewBuffer([]byte(postRenderedManifests)), nil
}
// AppendAdditionalResources appends additional resources to the given manifests.
func (p *ThreeportPostRenderer) AppendAdditionalResources(
manifests string,
additionalResources *datatypes.JSONSlice[datatypes.JSON],
) (string, error) {
if additionalResources == nil {
return manifests, nil
}
var output []string
for _, additionalResource := range *additionalResources {
var additionalResourceUnmarshaled map[string]interface{}
err := json.Unmarshal([]byte(additionalResource), &additionalResourceUnmarshaled)
if err != nil {
return manifests, fmt.Errorf("failed to unmarshal vol json: %w", err)
}
// convert unstructured kube object back to yaml
kubeObject := &unstructured.Unstructured{Object: additionalResourceUnmarshaled}
kubeObject.SetNamespace(*p.HelmWorkloadInstance.ReleaseNamespace)
yamlBytes, err := yaml.Marshal(additionalResource)
if err != nil {
return "", fmt.Errorf("failed to convert unstructured object back to YAML: %w", err)
}
output = append(output, string(yamlBytes))
}
return util.HyphenDelimitedString(output), nil
}