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package main
import (
"encoding/json"
"log"
"os"
)
var bomstore BomStore
// TODO: who owns returned BOMs? Caller? need "free" methods?
type BomStore interface {
GetStub(user, name ShortName) (*BomStub, error)
GetHead(user, name ShortName) (*Bom, error)
GetBom(user, name, version ShortName) (*Bom, error)
Persist(bs *BomStub, b *Bom, version ShortName) error
}
// Basic BomStore backend using a directory structure of JSON files saved to
// disk.
type JSONFileBomStore struct {
RootPath string
}
func NewJSONFileBomStore(path string) *JSONFileBomStore {
err := os.MkdirAll(path, os.ModePerm|os.ModeDir)
if err != nil && !os.IsExist(err) {
log.Fatal(err)
}
return &JSONFileBomStore{RootPath: path}
}
func (jfbs *JSONFileBomStore) GetStub(user, name ShortName) (*BomStub, error) {
path := jfbs.RootPath + "/" + string(user) + "/" + string(name) + "/meta.json"
bs := BomStub{}
if err := readJsonBomStub(path, &bs); err != nil {
return nil, err
}
return &bs, nil
}
func (jfbs *JSONFileBomStore) GetHead(user, name ShortName) (*Bom, error) {
bs, err := jfbs.GetStub(user, name)
if err != nil {
return nil, err
}
version := bs.HeadVersion
if version == "" {
log.Fatal("Tried to read undefined HEAD for " + string(user) + "/" + string(name))
}
return jfbs.GetBom(user, name, ShortName(version))
}
func (jfbs *JSONFileBomStore) GetBom(user, name, version ShortName) (*Bom, error) {
path := jfbs.RootPath + "/" + string(user) + "/" + string(name) + "/" + string(version) + ".json"
b := Bom{}
if err := readJsonBom(path, &b); err != nil {
return nil, err
}
return &b, nil
}
func (jfbs *JSONFileBomStore) Persist(bs *BomStub, b *Bom, version ShortName) error {
return nil
}
func readJsonBomStub(path string, bs *BomStub) error {
f, err := os.Open(path)
if err != nil {
return err
}
defer f.Close()
dec := json.NewDecoder(f)
if err = dec.Decode(&bs); err != nil {
return err
}
return nil
}
func writeJsonBomStub(path string, bs *BomStub) error {
f, err := os.Create(path)
if err != nil {
return err
}
defer f.Close()
enc := json.NewEncoder(f)
if err = enc.Encode(&bs); err != nil {
return err
}
return nil
}
func readJsonBom(path string, b *Bom) error {
f, err := os.Open(path)
if err != nil {
return err
}
defer f.Close()
dec := json.NewDecoder(f)
if err = dec.Decode(&b); err != nil {
return err
}
return nil
}
func writeJsonBom(path string, b *Bom) error {
f, err := os.Create(path)
if err != nil {
return err
}
defer f.Close()
enc := json.NewEncoder(f)
if err = enc.Encode(&b); err != nil {
return err
}
return nil
}
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