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templating.go
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templating.go
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package main
import (
"errors"
"github.com/aymerick/raymond"
"strings"
)
func (renderContext *RenderContext) Build(deployerSpec DeployerSpec, objects []map[string]interface{}) error {
envSlug := MakeUrlSlug(deployerSpec.Env, DNS_MAX_LENGTH)
branchSlug := MakeUrlSlug(deployerSpec.Branch, DNS_MAX_LENGTH)
renderContext.Namespace = deployerSpec.Namespace
renderContext.Env = envSlug
renderContext.Branch = branchSlug
renderContext.Containers = make(map[string]RenderContextContainer)
renderContext.Objects = make(map[string]map[string]RenderContextEnvAwareObject)
for _, container := range deployerSpec.Containers {
if container.Image == "" {
continue
}
containerName := container.Image + ":" + deployerSpec.TagVersion
renderContext.Containers[container.Id] = RenderContextContainer{
Name: containerName,
Image: containerName,
}
}
for _, object := range objects {
kind := object["kind"].(string)
var metadata = object["metadata"].(map[interface{}]interface{})
name := metadata["name"].(string)
envAwareName, err := buildEnvAwareObjectName(kind, name, renderContext)
if err != nil {
return err
}
if renderContext.Objects[kind] == nil {
renderContext.Objects[kind] = make(map[string]RenderContextEnvAwareObject)
}
renderContext.Objects[kind][name] = RenderContextEnvAwareObject{
Name: envAwareName,
}
}
renderContext.DeployerSpec = deployerSpec
return nil
}
func (renderContext *RenderContext) Render(templates []string) (string, error) {
renderedTemplates := make([]string, 0)
for _, template := range templates {
ctx := map[string]*RenderContext{
"context": renderContext,
}
renderedTemplate, err := raymond.Render(template, ctx)
if err != nil {
return "", err
}
renderedTemplates = append(renderedTemplates, renderedTemplate)
}
return strings.Join(renderedTemplates, "\n---\n"), nil
}
func buildEnvAwareObjectName(kind string, objectName string, renderContext *RenderContext) (string, error) {
sanitizedObjectName := MakeUrlSlug(objectName, DNS_MAX_LENGTH)
if (len(sanitizedObjectName) + 1 + len(renderContext.Env)) > DNS_MAX_LENGTH {
return "", errors.New("object name is too long: " + renderContext.Env + "-" + sanitizedObjectName)
}
envAwareObjectName := renderContext.Env + "-" + sanitizedObjectName
return envAwareObjectName, nil
}
type RenderContext struct {
Containers map[string]RenderContextContainer
Objects map[string]map[string]RenderContextEnvAwareObject
Env string
Branch string
Namespace string
DeployerSpec DeployerSpec
}
type RenderContextContainer struct {
Name string
Image string // Only for bc reasons
}
type RenderContextEnvAwareObject struct {
Name string
}