databricks-cli/bundle/bundle.go

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// Package bundle is the top level package for Databricks Application Bundles.
//
// A bundle is represented by the [Bundle] type. It consists of configuration
// and runtime state, such as a client to a Databricks workspace.
// Every mutation to a bundle's configuration or state is represented as a [Mutator].
// This interface makes every mutation observable and lets us reason about sequencing.
package bundle
import (
"os"
"path/filepath"
"sync"
"github.com/databricks/bricks/bundle/config"
"github.com/databricks/databricks-sdk-go"
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"github.com/hashicorp/terraform-exec/tfexec"
)
type Bundle struct {
Config config.Root
// Store a pointer to the workspace client.
// It can be initialized on demand after loading the configuration.
clientOnce sync.Once
client *databricks.WorkspaceClient
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// Stores an initialized copy of this bundle's Terraform wrapper.
Terraform *tfexec.Terraform
}
func Load(path string) (*Bundle, error) {
bundle := &Bundle{
Config: config.Root{
Path: path,
},
}
err := bundle.Config.Load(filepath.Join(path, config.FileName))
if err != nil {
return nil, err
}
return bundle, nil
}
// MustLoad returns a bundle configuration.
// It returns an error if a bundle was not found or could not be loaded.
func MustLoad() (*Bundle, error) {
root, err := mustGetRoot()
if err != nil {
return nil, err
}
return Load(root)
}
// TryLoad returns a bundle configuration if there is one, but doesn't fail if there isn't one.
// It returns an error if a bundle was found but could not be loaded.
// It returns a `nil` bundle if a bundle was not found.
func TryLoad() (*Bundle, error) {
root, err := tryGetRoot()
if err != nil {
return nil, err
}
// No root is fine in this function.
if root == "" {
return nil, nil
}
return Load(root)
}
func (b *Bundle) WorkspaceClient() *databricks.WorkspaceClient {
b.clientOnce.Do(func() {
var err error
b.client, err = b.Config.Workspace.Client()
if err != nil {
panic(err)
}
})
return b.client
}
var cacheDirName = filepath.Join(".databricks", "bundle")
// CacheDir returns directory to use for temporary files for this bundle.
// Scoped to the bundle's environment.
func (b *Bundle) CacheDir(paths ...string) (string, error) {
if b.Config.Bundle.Environment == "" {
panic("environment not set")
}
// Fixed components of the result path.
parts := []string{
// Anchor at bundle root directory.
b.Config.Path,
// Static cache directory.
cacheDirName,
// Scope with environment name.
b.Config.Bundle.Environment,
}
// Append dynamic components of the result path.
parts = append(parts, paths...)
// Make directory if it doesn't exist yet.
dir := filepath.Join(parts...)
err := os.MkdirAll(dir, 0700)
if err != nil {
return "", err
}
return dir, nil
}