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load.go
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load.go
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package declcfg
import (
"context"
"encoding/json"
"errors"
"fmt"
"io"
"io/fs"
"path/filepath"
"runtime"
"sync"
"github.com/joelanford/ignore"
"github.com/operator-framework/api/pkg/operators"
"golang.org/x/sync/errgroup"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/util/yaml"
"github.com/operator-framework/operator-registry/alpha/property"
)
const (
indexIgnoreFilename = ".indexignore"
)
type WalkMetasFSFunc func(path string, meta *Meta, err error) error
func WalkMetasFS(root fs.FS, walkFn WalkMetasFSFunc) error {
return walkFiles(root, func(root fs.FS, path string, err error) error {
if err != nil {
return walkFn(path, nil, err)
}
f, err := root.Open(path)
if err != nil {
return walkFn(path, nil, err)
}
defer f.Close()
return WalkMetasReader(f, func(meta *Meta, err error) error {
return walkFn(path, meta, err)
})
})
}
type WalkMetasReaderFunc func(meta *Meta, err error) error
func WalkMetasReader(r io.Reader, walkFn WalkMetasReaderFunc) error {
dec := yaml.NewYAMLOrJSONDecoder(r, 4096)
for {
var in Meta
if err := dec.Decode(&in); err != nil {
if errors.Is(err, io.EOF) {
break
}
return walkFn(nil, err)
}
if err := walkFn(&in, nil); err != nil {
return err
}
}
return nil
}
type WalkFunc func(path string, cfg *DeclarativeConfig, err error) error
// WalkFS walks root using a gitignore-style filename matcher to skip files
// that match patterns found in .indexignore files found throughout the filesystem.
// It calls walkFn for each declarative config file it finds. If WalkFS encounters
// an error loading or parsing any file, the error will be immediately returned.
func WalkFS(root fs.FS, walkFn WalkFunc) error {
return walkFiles(root, func(root fs.FS, path string, err error) error {
if err != nil {
return walkFn(path, nil, err)
}
cfg, err := LoadFile(root, path)
if err != nil {
return walkFn(path, cfg, err)
}
return walkFn(path, cfg, nil)
})
}
func walkFiles(root fs.FS, fn func(root fs.FS, path string, err error) error) error {
if root == nil {
return fmt.Errorf("no declarative config filesystem provided")
}
matcher, err := ignore.NewMatcher(root, indexIgnoreFilename)
if err != nil {
return err
}
return fs.WalkDir(root, ".", func(path string, info fs.DirEntry, err error) error {
if err != nil {
return fn(root, path, err)
}
// avoid validating a directory, an .indexignore file, or any file that matches
// an ignore pattern outlined in a .indexignore file.
if info.IsDir() || info.Name() == indexIgnoreFilename || matcher.Match(path, false) {
return nil
}
return fn(root, path, nil)
})
}
type LoadOptions struct {
concurrency int
}
type LoadOption func(*LoadOptions)
func WithConcurrency(concurrency int) LoadOption {
return func(opts *LoadOptions) {
opts.concurrency = concurrency
}
}
// LoadFS loads a declarative config from the provided root FS. LoadFS walks the
// filesystem from root and uses a gitignore-style filename matcher to skip files
// that match patterns found in .indexignore files found throughout the filesystem.
// If LoadFS encounters an error loading or parsing any file, the error will be
// immediately returned.
func LoadFS(ctx context.Context, root fs.FS, opts ...LoadOption) (*DeclarativeConfig, error) {
if root == nil {
return nil, fmt.Errorf("no declarative config filesystem provided")
}
options := LoadOptions{
concurrency: runtime.NumCPU(),
}
for _, opt := range opts {
opt(&options)
}
var (
fcfg = &DeclarativeConfig{}
pathChan = make(chan string, options.concurrency)
cfgChan = make(chan *DeclarativeConfig, options.concurrency)
)
// Create an errgroup to manage goroutines. The context is closed when any
// goroutine returns an error. Goroutines should check the context
// to see if they should return early (in the case of another goroutine
// returning an error).
eg, ctx := errgroup.WithContext(ctx)
// Walk the FS and send paths to a channel for parsing.
eg.Go(func() error {
return sendPaths(ctx, root, pathChan)
})
// Parse paths concurrently. The waitgroup ensures that all paths are parsed
// before the cfgChan is closed.
var wg sync.WaitGroup
for i := 0; i < options.concurrency; i++ {
wg.Add(1)
eg.Go(func() error {
defer wg.Done()
return parsePaths(ctx, root, pathChan, cfgChan)
})
}
// Merge parsed configs into a single config.
eg.Go(func() error {
return mergeCfgs(ctx, cfgChan, fcfg)
})
// Wait for all path parsing goroutines to finish before closing cfgChan.
wg.Wait()
close(cfgChan)
// Wait for all goroutines to finish.
if err := eg.Wait(); err != nil {
return nil, err
}
return fcfg, nil
}
func sendPaths(ctx context.Context, root fs.FS, pathChan chan<- string) error {
defer close(pathChan)
return walkFiles(root, func(_ fs.FS, path string, err error) error {
if err != nil {
return err
}
select {
case pathChan <- path:
case <-ctx.Done(): // don't block on sending to pathChan
return ctx.Err()
}
return nil
})
}
func parsePaths(ctx context.Context, root fs.FS, pathChan <-chan string, cfgChan chan<- *DeclarativeConfig) error {
for {
select {
case <-ctx.Done(): // don't block on receiving from pathChan
return ctx.Err()
case path, ok := <-pathChan:
if !ok {
return nil
}
cfg, err := LoadFile(root, path)
if err != nil {
return err
}
select {
case cfgChan <- cfg:
case <-ctx.Done(): // don't block on sending to cfgChan
return ctx.Err()
}
}
}
}
func mergeCfgs(ctx context.Context, cfgChan <-chan *DeclarativeConfig, fcfg *DeclarativeConfig) error {
for {
select {
case <-ctx.Done(): // don't block on receiving from cfgChan
return ctx.Err()
case cfg, ok := <-cfgChan:
if !ok {
return nil
}
fcfg.Packages = append(fcfg.Packages, cfg.Packages...)
fcfg.Channels = append(fcfg.Channels, cfg.Channels...)
fcfg.Bundles = append(fcfg.Bundles, cfg.Bundles...)
fcfg.Others = append(fcfg.Others, cfg.Others...)
}
}
}
func readBundleObjects(bundles []Bundle, root fs.FS, path string) error {
for bi, b := range bundles {
props, err := property.Parse(b.Properties)
if err != nil {
return fmt.Errorf("package %q, bundle %q: parse properties: %v", b.Package, b.Name, err)
}
for oi, obj := range props.BundleObjects {
objID := fmt.Sprintf(" %q", obj.GetRef())
if !obj.IsRef() {
objID = fmt.Sprintf("[%d]", oi)
}
d, err := obj.GetData(root, filepath.Dir(path))
if err != nil {
return fmt.Errorf("package %q, bundle %q: get data for bundle object%s: %v", b.Package, b.Name, objID, err)
}
objJson, err := yaml.ToJSON(d)
if err != nil {
return fmt.Errorf("package %q, bundle %q: convert object%s to JSON: %v", b.Package, b.Name, objID, err)
}
bundles[bi].Objects = append(bundles[bi].Objects, string(objJson))
}
bundles[bi].CsvJSON = extractCSV(bundles[bi].Objects)
}
return nil
}
func extractCSV(objs []string) string {
for _, obj := range objs {
u := unstructured.Unstructured{}
if err := yaml.Unmarshal([]byte(obj), &u); err != nil {
continue
}
if u.GetKind() == operators.ClusterServiceVersionKind {
return obj
}
}
return ""
}
// LoadReader reads yaml or json from the passed in io.Reader and unmarshals it into a DeclarativeConfig struct.
// Path references will not be de-referenced so callers are responsible for de-referencing if necessary.
func LoadReader(r io.Reader) (*DeclarativeConfig, error) {
cfg := &DeclarativeConfig{}
if err := WalkMetasReader(r, func(in *Meta, err error) error {
if err != nil {
return err
}
switch in.Schema {
case SchemaPackage:
var p Package
if err := json.Unmarshal(in.Blob, &p); err != nil {
return fmt.Errorf("parse package: %v", err)
}
cfg.Packages = append(cfg.Packages, p)
case SchemaChannel:
var c Channel
if err := json.Unmarshal(in.Blob, &c); err != nil {
return fmt.Errorf("parse channel: %v", err)
}
cfg.Channels = append(cfg.Channels, c)
case SchemaBundle:
var b Bundle
if err := json.Unmarshal(in.Blob, &b); err != nil {
return fmt.Errorf("parse bundle: %v", err)
}
cfg.Bundles = append(cfg.Bundles, b)
case "":
return fmt.Errorf("object '%s' is missing root schema field", string(in.Blob))
default:
cfg.Others = append(cfg.Others, *in)
}
return nil
}); err != nil {
return nil, err
}
return cfg, nil
}
// LoadFile will unmarshall declarative config components from a single filename provided in 'path'
// located at a filesystem hierarchy 'root'
func LoadFile(root fs.FS, path string) (*DeclarativeConfig, error) {
file, err := root.Open(path)
if err != nil {
return nil, err
}
defer file.Close()
cfg, err := LoadReader(file)
if err != nil {
return nil, err
}
if err := readBundleObjects(cfg.Bundles, root, path); err != nil {
return nil, fmt.Errorf("read bundle objects: %v", err)
}
return cfg, nil
}