tests passing

1 files changed, 102 insertions, 7 deletions

diff --git a/store.go b/store.go
index 3fb279f..11b2b5c 100644
--- a/store.go
+++ b/store.go
@@ -1,5 +1,11 @@
 package main
 
+import (
+	"encoding/json"
+	"log"
+	"os"
+)
+
 var bomstore BomStore
 
 // TODO: who owns returned BOMs? Caller? need "free" methods?
@@ -7,16 +13,105 @@ type BomStore interface {
 	GetStub(user, name ShortName) (*BomStub, error)
 	GetHead(user, name ShortName) (*Bom, error)
 	GetBom(user, name, version ShortName) (*Bom, error)
-	Persist(bom *Bom) error
+	Persist(bs *BomStub, b *Bom, version ShortName) error
 }
 
-/*
-// Dummy BomStore backed by hashtable in memory, for testing and demo purposes
-type MemoryBomStore map[string] Bom
-*/
-
 // Basic BomStore backend using a directory structure of JSON files saved to
 // disk.
 type JSONFileBomStore struct {
-	rootPath string
+	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
 }