forked from cardigann/cardigann
/
load.go
218 lines (177 loc) · 3.88 KB
/
load.go
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package indexer
import (
"errors"
"fmt"
"io/ioutil"
"net/http"
"os"
"path"
"regexp"
"sort"
"strings"
"github.com/cardigann/cardigann/config"
)
var (
ErrUnknownIndexer = errors.New("Unknown indexer")
DefaultDefinitionLoader DefinitionLoader
)
func ListBuiltins() ([]string, error) {
l := escLoader{Dir(false, "")}
return l.List()
}
func LoadEnabledDefinitions(conf config.Config) ([]*IndexerDefinition, error) {
keys, err := DefaultDefinitionLoader.List()
if err != nil {
return nil, err
}
defs := []*IndexerDefinition{}
for _, key := range keys {
if config.IsSectionEnabled(key, conf) {
def, err := DefaultDefinitionLoader.Load(key)
if err != nil {
return nil, err
}
defs = append(defs, def)
}
}
return defs, nil
}
type DefinitionLoader interface {
List() ([]string, error)
Load(key string) (*IndexerDefinition, error)
}
func init() {
DefaultDefinitionLoader = &multiLoader{
newFsLoader(),
escLoader{Dir(false, "")},
}
}
type fsLoader struct {
dirs []string
}
func newFsLoader() DefinitionLoader {
return &fsLoader{config.GetDefinitionDirs()}
}
func (fs *fsLoader) walkDirectories() (map[string]string, error) {
defs := map[string]string{}
for _, dirpath := range fs.dirs {
dir, err := os.Open(dirpath)
if os.IsNotExist(err) {
continue
}
files, err := dir.Readdirnames(-1)
if err != nil {
continue
}
for _, basename := range files {
if strings.HasSuffix(basename, ".yml") {
defs[strings.TrimSuffix(basename, ".yml")] = path.Join(dir.Name(), basename)
}
}
}
return defs, nil
}
func (fs *fsLoader) List() ([]string, error) {
defs, err := fs.walkDirectories()
if err != nil {
return nil, err
}
results := []string{}
for k := range defs {
results = append(results, k)
}
return results, nil
}
func (fs *fsLoader) Load(key string) (*IndexerDefinition, error) {
defs, err := fs.walkDirectories()
if err != nil {
return nil, err
}
fileName, ok := defs[key]
if !ok {
return nil, ErrUnknownIndexer
}
f, err := os.Open(fileName)
if err != nil {
return nil, err
}
def, err := ParseDefinitionFile(f)
if err != nil {
return def, err
}
def.stats.Source = "file:" + fileName
return def, err
}
type multiLoader []DefinitionLoader
func (ml multiLoader) List() ([]string, error) {
allResults := map[string]struct{}{}
for _, loader := range ml {
result, err := loader.List()
if err != nil {
return nil, err
}
for _, val := range result {
allResults[val] = struct{}{}
}
}
results := []string{}
for key := range allResults {
results = append(results, key)
}
sort.Sort(sort.StringSlice(results))
return results, nil
}
func (ml multiLoader) Load(key string) (*IndexerDefinition, error) {
var def *IndexerDefinition
for _, loader := range ml {
loaded, err := loader.Load(key)
if err != nil {
continue
}
if def == nil || loaded.Stats().ModTime.After(def.Stats().ModTime) {
def = loaded
}
}
if def == nil {
return nil, ErrUnknownIndexer
}
return def, nil
}
var escFilenameRegex = regexp.MustCompile(`^/definitions/(.+?)\.yml$`)
type escLoader struct {
http.FileSystem
}
func (el escLoader) List() ([]string, error) {
results := []string{}
for filename := range _escData {
if matches := escFilenameRegex.FindStringSubmatch(filename); matches != nil {
results = append(results, matches[1])
}
}
return results, nil
}
func (el escLoader) Load(key string) (*IndexerDefinition, error) {
fname := fmt.Sprintf("/definitions/%s.yml", key)
f, err := el.Open(fname)
if os.IsNotExist(err) {
return nil, ErrUnknownIndexer
} else if err != nil {
return nil, err
}
defer f.Close()
data, err := ioutil.ReadAll(f)
if err != nil {
return nil, err
}
def, err := ParseDefinition(data)
if err != nil {
return def, err
}
fi, err := f.Stat()
if err != nil {
return def, err
}
def.stats.ModTime = fi.ModTime()
def.stats.Source = "builtin:" + fname
return def, nil
}