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service.go
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service.go
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package sideload
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"os"
"path/filepath"
"sync"
"github.com/ghodss/yaml"
"github.com/influxdata/kapacitor/keyvalue"
"github.com/influxdata/kapacitor/services/httpd"
"github.com/pkg/errors"
)
const (
reloadPath = "/sideload/reload"
basePath = httpd.BasePath + reloadPath
)
type Diagnostic interface {
WithContext(ctx ...keyvalue.T) Diagnostic
Error(msg string, err error)
}
type Service struct {
diag Diagnostic
routes []httpd.Route
mu sync.Mutex
sources map[string]*source
HTTPDService interface {
AddRoutes([]httpd.Route) error
DelRoutes([]httpd.Route)
}
}
func NewService(d Diagnostic) *Service {
return &Service{
diag: d,
sources: make(map[string]*source),
}
}
func (s *Service) Open() error {
// Define API routes
s.routes = []httpd.Route{
{
Method: "POST",
Pattern: reloadPath,
HandlerFunc: s.handleReload,
},
}
err := s.HTTPDService.AddRoutes(s.routes)
return errors.Wrap(err, "failed to add API routes")
}
func (s *Service) Close() error {
s.HTTPDService.DelRoutes(s.routes)
return nil
}
func (s *Service) handleReload(w http.ResponseWriter, r *http.Request) {
err := s.Reload()
if err != nil {
httpd.HttpError(w, err.Error(), true, http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusNoContent)
}
func (s *Service) Reload() error {
s.mu.Lock()
defer s.mu.Unlock()
for dir, src := range s.sources {
if err := src.updateCache(); err != nil {
return errors.Wrapf(err, "failed to update source %q", dir)
}
}
return nil
}
func (s *Service) Source(srcURL string) (Source, error) {
u, err := url.Parse(srcURL)
if err != nil {
return nil, err
}
if u.Scheme != "file" {
return nil, fmt.Errorf("unsupported source scheme %q, must be 'file'", u.Scheme)
}
if !filepath.IsAbs(u.Path) {
return nil, fmt.Errorf("sideload source path must be absolute %q", u.Path)
}
dir := filepath.Clean(u.Path)
s.mu.Lock()
defer s.mu.Unlock()
src, ok := s.sources[dir]
if !ok {
src = &source{
s: s,
dir: dir,
}
err := src.updateCache()
if err != nil {
return nil, err
}
s.sources[dir] = src
}
src.referenceCount++
return src, nil
}
func (s *Service) removeSource(src *source) {
s.mu.Lock()
defer s.mu.Unlock()
src.referenceCount--
if src.referenceCount == 0 {
delete(s.sources, src.dir)
}
}
type Source interface {
Lookup(order []string, key string) interface{}
Close()
}
type source struct {
s *Service
dir string
mu sync.RWMutex
cache map[string]map[string]interface{}
referenceCount int
}
func (s *source) Close() {
s.s.removeSource(s)
}
func (s *source) updateCache() error {
s.mu.Lock()
defer s.mu.Unlock()
s.cache = make(map[string]map[string]interface{})
err := filepath.Walk(s.dir, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.IsDir() {
return nil
}
values, err := readValues(path)
if err != nil {
return err
}
rel, err := filepath.Rel(s.dir, path)
if err != nil {
return err
}
// The relative path must be a child of s.dir.
// If it starts with '.' then it is either outside of s.dir or equal to s.dir,
// both cases are invalid.
if len(rel) == 0 || rel[0] == '.' {
return errors.New("invalid relative path")
}
s.cache[rel] = values
return nil
})
return errors.Wrapf(err, "failed to update sideload cache for source %q", s.dir)
}
func (s *source) Lookup(order []string, key string) (value interface{}) {
key = filepath.Clean(key)
s.mu.RLock()
defer s.mu.RUnlock()
for _, o := range order {
values, ok := s.cache[o]
if !ok {
continue
}
v, ok := values[key]
if !ok {
continue
}
value = v
break
}
return
}
func readValues(p string) (map[string]interface{}, error) {
f, err := os.Open(p)
if err != nil {
return nil, errors.Wrapf(err, "failed to open values file %q", p)
}
defer f.Close()
data, err := ioutil.ReadAll(f)
if err != nil {
return nil, errors.Wrapf(err, "failed to read values file %q", p)
}
values := make(map[string]interface{})
ext := filepath.Ext(p)
switch ext {
case ".yaml", ".yml":
if err := yaml.Unmarshal(data, &values); err != nil {
return nil, errors.Wrapf(err, "failed to unmarshal yaml values %q", p)
}
case ".json":
if err := json.Unmarshal(data, &values); err != nil {
return nil, errors.Wrapf(err, "failed to unmarshal json values %q", p)
}
}
return values, nil
}