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neonvm-controller: Add image mapping feature
The image map allows quickly overriding image names specified in the VirtualMachine spec. This is for local developmnet, there's currently no intention of using this in production. I will use this to implement fast reloading of compute images, when you run the console and control plane under Tilt.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| package controllers | ||
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| // An "image map" allows quick overriding of the images specified in VirtualMachine objects. | ||
| // That's handy during local development, for example, so that you can quickly swap images | ||
| // without having to change the compute image name in the control plane database. The image | ||
| // map is used by the compute.Tiltfile in the cloud repository to allow Tilt to replace the | ||
| // compute image; the Tiltfile commands regenerate the image mapping file with the tilt-generated | ||
| // image names whenever the compute images are rebuilt. | ||
| // | ||
| // An image map file consists of pairs of image names, specifying that when the VirtualMachine | ||
| // spec contains X, it is replaced with Y. If an image name is not present in the image map, it | ||
| // is used without changes. For example, to replace v17 and v16 images with local versions, | ||
| // you could use this file: | ||
| // | ||
| // ``` | ||
| // "vm-compute-node-v17:latest" = "vm-compute-node-v17:dev" | ||
| // "vm-compute-node-v16:latest" = "vm-compute-node-v16:dev" | ||
| // ``` | ||
| // | ||
| // We use a toml file parser to parse the file, so toml syntax rules on comments and escaping | ||
| // apply. | ||
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|
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| import ( | ||
| "context" | ||
| "os" | ||
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| "github.com/BurntSushi/toml" | ||
| "sigs.k8s.io/controller-runtime/pkg/log" | ||
| ) | ||
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| type ImageMap map[string]string | ||
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| func EmptyImageMap() ImageMap { | ||
| return map[string]string{} | ||
| } | ||
|
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| func tryLoadImageMap(ctx context.Context, path string) ImageMap { | ||
| if path == "" { | ||
| return EmptyImageMap() | ||
| } | ||
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| log := log.FromContext(ctx) | ||
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| newMap, err := loadImageMap(path) | ||
| if err != nil { | ||
| log.Error(err, "could not read image mapping file", | ||
| "ImageMapPath", path) | ||
| } | ||
|
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| content, err := os.ReadFile(path) | ||
| if err != nil { | ||
| log.Error(err, "xcould not read image mapping file", | ||
| "ImageMapPath", path) | ||
| return EmptyImageMap() | ||
| } | ||
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| log.Info("imagemap loaded", "map", newMap, "content", content) | ||
| return newMap | ||
| } | ||
|
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| func loadImageMap(path string) (ImageMap, error) { | ||
| content, err := os.ReadFile(path) | ||
| if err != nil { | ||
| return EmptyImageMap(), err | ||
| } | ||
| var newMap map[string]string | ||
| err = toml.Unmarshal(content, &newMap) | ||
| if err != nil { | ||
| return EmptyImageMap(), err | ||
| } | ||
| return newMap, nil | ||
| } | ||
|
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| func (imageMap *ImageMap) mapImage(image string) string { | ||
| mappedImage := (*imageMap)[image] | ||
| if mappedImage != "" { | ||
| return mappedImage | ||
| } else { | ||
| return image | ||
| } | ||
| } |
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