examples: storage example review

1 files changed, 360 insertions, 0 deletions

diff --git a/examples/storage/storage.go b/examples/storage/storage.go
new file mode 100644
index 0000000..2231f95
--- /dev/null
+++ b/examples/storage/storage.go
@@ -0,0 +1,360 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"io/ioutil"
+
+	"gopkg.in/src-d/go-git.v4/config"
+	"gopkg.in/src-d/go-git.v4/core"
+
+	"github.com/aerospike/aerospike-client-go"
+)
+
+const (
+	urlField      = "url"
+	referencesSet = "reference"
+	remotesSet    = "remote"
+)
+
+type AerospikeStorage struct {
+	client *aerospike.Client
+	ns     string
+	url    string
+
+	os *AerospikeObjectStorage
+	rs *AerospikeReferenceStorage
+	cs *AerospikeConfigStorage
+}
+
+func NewAerospikeStorage(client *aerospike.Client, ns, url string) (*AerospikeStorage, error) {
+	if err := createIndexes(client, ns); err != nil {
+		return nil, err
+	}
+
+	return &AerospikeStorage{client: client, ns: ns, url: url}, nil
+}
+
+func (s *AerospikeStorage) ObjectStorage() core.ObjectStorage {
+	if s.os == nil {
+		s.os = &AerospikeObjectStorage{s.client, s.ns, s.url}
+	}
+
+	return s.os
+}
+
+func (s *AerospikeStorage) ReferenceStorage() core.ReferenceStorage {
+	if s.rs == nil {
+		s.rs = &AerospikeReferenceStorage{s.client, s.ns, s.url}
+	}
+
+	return s.rs
+}
+
+func (s *AerospikeStorage) ConfigStorage() config.ConfigStorage {
+	if s.cs == nil {
+		s.cs = &AerospikeConfigStorage{s.client, s.ns, s.url}
+	}
+
+	return s.cs
+}
+
+type AerospikeObjectStorage struct {
+	client *aerospike.Client
+	ns     string
+	url    string
+}
+
+func (s *AerospikeObjectStorage) NewObject() core.Object {
+	return &core.MemoryObject{}
+}
+
+func (s *AerospikeObjectStorage) Set(obj core.Object) (core.Hash, error) {
+	key, err := aerospike.NewKey(s.ns, obj.Type().String(), obj.Hash().String())
+	if err != nil {
+		return obj.Hash(), err
+	}
+
+	r, err := obj.Reader()
+	if err != nil {
+		return obj.Hash(), err
+	}
+
+	c, err := ioutil.ReadAll(r)
+	if err != nil {
+		return obj.Hash(), err
+	}
+
+	bins := aerospike.BinMap{
+		urlField: s.url,
+		"hash":   obj.Hash().String(),
+		"type":   obj.Type().String(),
+		"blob":   c,
+	}
+
+	err = s.client.Put(nil, key, bins)
+	return obj.Hash(), err
+}
+
+func (s *AerospikeObjectStorage) Get(t core.ObjectType, h core.Hash) (core.Object, error) {
+	key, err := s.keyFromObject(h, t)
+	if err != nil {
+		return nil, err
+	}
+
+	rec, err := s.client.Get(nil, key)
+	if err != nil {
+		return nil, err
+	}
+
+	return nil, core.ErrObjectNotFound
+}
+
+func (s *AerospikeObjectStorage) Iter(t core.ObjectType) (core.ObjectIter, error) {
+	stmnt := aerospike.NewStatement(s.ns, t.String())
+	err := stmnt.Addfilter(aerospike.NewEqualFilter(urlField, s.url))
+
+	rs, err := s.client.Query(nil, stmnt)
+	if err != nil {
+		return nil, err
+	}
+
+	return &AerospikeObjectIter{t, rs.Records}, nil
+}
+
+func (s *AerospikeObjectStorage) keyFromObject(h core.Hash, t core.ObjectType,
+) (*aerospike.Key, error) {
+	fmt.Println(t.String())
+	return aerospike.NewKey(s.ns, t.String(), h.String())
+}
+
+type AerospikeObjectIter struct {
+	t  core.ObjectType
+	ch chan *aerospike.Record
+}
+
+func (i *AerospikeObjectIter) Next() (core.Object, error) {
+	r := <-i.ch
+	if r == nil {
+		return nil, io.EOF
+	}
+
+	return objectFromRecord(r, i.t)
+}
+
+func (i *AerospikeObjectIter) ForEach(cb func(obj core.Object) error) error {
+	for {
+		obj, err := i.Next()
+		if err != nil {
+			if err == io.EOF {
+				return nil
+			}
+
+			return err
+		}
+
+		if err := cb(obj); err != nil {
+			if err == core.ErrStop {
+				return nil
+			}
+
+			return err
+		}
+	}
+}
+
+func (i *AerospikeObjectIter) Close() {}
+
+func objectFromRecord(r *aerospike.Record, t core.ObjectType) (core.Object, error) {
+	content := r.Bins["blob"].([]byte)
+
+	o := &core.MemoryObject{}
+	o.SetType(t)
+	o.SetSize(int64(len(content)))
+
+	_, err := o.Write(content)
+	if err != nil {
+		return nil, err
+	}
+
+	return o, nil
+}
+
+type AerospikeReferenceStorage struct {
+	client *aerospike.Client
+	ns     string
+	url    string
+}
+
+// Set stores a reference.
+func (s *AerospikeReferenceStorage) Set(ref *core.Reference) error {
+	key, err := aerospike.NewKey(s.ns, referencesSet, ref.Name().String())
+	if err != nil {
+		return err
+	}
+
+	raw := ref.Strings()
+	bins := aerospike.BinMap{
+		urlField: s.url,
+		"name":   raw[0],
+		"target": raw[1],
+	}
+
+	return s.client.Put(nil, key, bins)
+}
+
+// Get returns a stored reference with the given name
+func (s *AerospikeReferenceStorage) Get(n core.ReferenceName) (*core.Reference, error) {
+	key, err := aerospike.NewKey(s.ns, referencesSet, n.String())
+	if err != nil {
+		return nil, err
+	}
+
+	rec, err := s.client.Get(nil, key)
+	if err != nil {
+		return nil, err
+	}
+
+	return core.NewReferenceFromStrings(
+		rec.Bins["name"].(string),
+		rec.Bins["target"].(string),
+	), nil
+}
+
+// Iter returns a core.ReferenceIter
+func (s *AerospikeReferenceStorage) Iter() (core.ReferenceIter, error) {
+	stmnt := aerospike.NewStatement(s.ns, referencesSet)
+	err := stmnt.Addfilter(aerospike.NewEqualFilter(urlField, s.url))
+	if err != nil {
+		return nil, err
+	}
+
+	rs, err := s.client.Query(nil, stmnt)
+	if err != nil {
+		return nil, err
+	}
+
+	var refs []*core.Reference
+	for r := range rs.Records {
+		refs = append(refs, core.NewReferenceFromStrings(
+			r.Bins["name"].(string),
+			r.Bins["target"].(string),
+		))
+	}
+
+	return core.NewReferenceSliceIter(refs), nil
+}
+
+type AerospikeConfigStorage struct {
+	client *aerospike.Client
+	ns     string
+	url    string
+}
+
+func (s *AerospikeConfigStorage) Remote(name string) (*config.RemoteConfig, error) {
+	key, err := aerospike.NewKey(s.ns, remotesSet, name)
+	if err != nil {
+		return nil, err
+	}
+
+	rec, err := s.client.Get(nil, key)
+	if err != nil {
+		return nil, err
+	}
+
+	return remoteFromRecord(rec)
+}
+
+func remoteFromRecord(r *aerospike.Record) (*config.RemoteConfig, error) {
+	content := r.Bins["blob"].([]byte)
+
+	c := &config.RemoteConfig{}
+	return c, json.Unmarshal(content, c)
+}
+
+func (s *AerospikeConfigStorage) Remotes() ([]*config.RemoteConfig, error) {
+	stmnt := aerospike.NewStatement(s.ns, remotesSet)
+	err := stmnt.Addfilter(aerospike.NewEqualFilter(urlField, s.url))
+	if err != nil {
+		return nil, err
+	}
+
+	rs, err := s.client.Query(nil, stmnt)
+	if err != nil {
+		return nil, err
+		return nil, err
+	}
+
+	var remotes []*config.RemoteConfig
+	for r := range rs.Records {
+		remote, err := remoteFromRecord(r)
+		if err != nil {
+			return nil, err
+		}
+
+		remotes = append(remotes, remote)
+	}
+
+	return remotes, nil
+}
+
+func (s *AerospikeConfigStorage) SetRemote(r *config.RemoteConfig) error {
+	key, err := aerospike.NewKey(s.ns, remotesSet, r.Name)
+	if err != nil {
+		return err
+	}
+
+	json, err := json.Marshal(r)
+	if err != nil {
+		return err
+	}
+
+	bins := aerospike.BinMap{
+		urlField: s.url,
+		"name":   r.Name,
+		"blob":   json,
+	}
+
+	return s.client.Put(nil, key, bins)
+}
+
+func (s *AerospikeConfigStorage) DeleteRemote(name string) error {
+	key, err := aerospike.NewKey(s.ns, remotesSet, name)
+	if err != nil {
+		return err
+	}
+
+	_, err = s.client.Delete(nil, key)
+	return err
+}
+
+func createIndexes(c *aerospike.Client, ns string) error {
+	for _, set := range [...]string{
+		referencesSet,
+		remotesSet,
+		core.BlobObject.String(),
+		core.TagObject.String(),
+		core.TreeObject.String(),
+		core.CommitObject.String(),
+	} {
+		if err := createIndex(c, ns, set); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func createIndex(c *aerospike.Client, ns, set string) error {
+	task, err := c.CreateIndex(nil, ns, set, set, urlField, aerospike.STRING)
+	if err != nil {
+		if err.Error() == "Index already exists" {
+			return nil
+		}
+
+		return err
+	}
+
+	return <-task.OnComplete()
+}