From b48f1f2c372d1fa7bca155c449c590d852a03511 Mon Sep 17 00:00:00 2001
From: Laria Carolin Chabowski <laria@laria.me>
Date: Tue, 26 Sep 2017 21:33:50 +0200
Subject: Add cloudstorage support

For now Openstack Swift is supported. But it should be pretty easy to
implement other Swift / S3 like object storages.
---
 storage/cloud/swift.go | 118 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 storage/cloud/swift.go

(limited to 'storage/cloud/swift.go')

diff --git a/storage/cloud/swift.go b/storage/cloud/swift.go
new file mode 100644
index 0000000..41a13c6
--- /dev/null
+++ b/storage/cloud/swift.go
@@ -0,0 +1,118 @@
+package cloud
+
+import (
+	"code.laria.me/petrific/config"
+	"code.laria.me/petrific/storage"
+	"fmt"
+	"github.com/ncw/swift"
+	"time"
+)
+
+type SwiftCloudStorage struct {
+	con       *swift.Connection
+	container string
+}
+
+type SwiftStorageConfigMandatoryError struct {
+	Key string
+	Err error
+}
+
+func (e SwiftStorageConfigMandatoryError) Error() string {
+	return fmt.Sprintf("Could not get mandatory key %s for swift storage: %s", e.Key, e.Err.Error())
+}
+
+func SwiftStorageCreator() storage.CreateStorageFromConfig {
+	return cloudStorageCreator(func(conf config.Config, name string) (CloudStorage, error) {
+		storage_conf := conf.Storage[name]
+		storage := SwiftCloudStorage{}
+		storage.con = new(swift.Connection)
+
+		// Mandatory options
+		if err := storage_conf.Get("container", &storage.container); err != nil {
+			return nil, SwiftStorageConfigMandatoryError{"container", err}
+		}
+		if err := storage_conf.Get("user_name", &storage.con.UserName); err != nil {
+			return nil, SwiftStorageConfigMandatoryError{"user_name", err}
+		}
+		if err := storage_conf.Get("api_key", &storage.con.ApiKey); err != nil {
+			return nil, SwiftStorageConfigMandatoryError{"api_key", err}
+		}
+		if err := storage_conf.Get("auth_url", &storage.con.AuthUrl); err != nil {
+			return nil, SwiftStorageConfigMandatoryError{"auth_url", err}
+		}
+
+		// Optional... options
+
+		storage_conf.Get("domain", &storage.con.Domain)
+		storage_conf.Get("domain_id", &storage.con.DomainId)
+		storage_conf.Get("user_id", &storage.con.UserId)
+		storage_conf.Get("retries", &storage.con.Retries)
+		storage_conf.Get("region", &storage.con.Region)
+		storage_conf.Get("auth_version", &storage.con.AuthVersion)
+		storage_conf.Get("tenant", &storage.con.Tenant)
+		storage_conf.Get("tenant_id", &storage.con.TenantId)
+		storage_conf.Get("tenant_domain", &storage.con.TenantDomain)
+		storage_conf.Get("tenant_domain_id", &storage.con.TenantDomainId)
+		storage_conf.Get("trust_id", &storage.con.TrustId)
+
+		var connect_timeout_str string
+		if storage_conf.Get("connect_timeout", &connect_timeout_str) == nil {
+			d, err := time.ParseDuration(connect_timeout_str)
+			if err != nil {
+				return nil, err
+			}
+			storage.con.ConnectTimeout = d
+		}
+
+		var timeout_str string
+		if storage_conf.Get("timeout", &timeout_str) == nil {
+			d, err := time.ParseDuration(timeout_str)
+			if err != nil {
+				return nil, err
+			}
+			storage.con.Timeout = d
+		}
+
+		if err := storage.con.Authenticate(); err != nil {
+			return nil, err
+		}
+
+		return storage, nil
+	})
+}
+
+func (scs SwiftCloudStorage) Get(key string) ([]byte, error) {
+	return scs.con.ObjectGetBytes(scs.container, key)
+}
+
+func (scs SwiftCloudStorage) Has(key string) (bool, error) {
+	switch _, _, err := scs.con.Object(scs.container, key); err {
+	case nil:
+		return true, nil
+	case swift.ObjectNotFound:
+		return false, nil
+	default:
+		return false, err
+	}
+}
+
+func (scs SwiftCloudStorage) Put(key string, content []byte) error {
+	err := scs.con.ObjectPutBytes(scs.container, key, content, "application/octet-stream")
+
+	return err
+}
+
+func (scs SwiftCloudStorage) Delete(key string) error {
+	return scs.con.ObjectDelete(scs.container, key)
+}
+
+func (scs SwiftCloudStorage) List(prefix string) ([]string, error) {
+	return scs.con.ObjectNamesAll(scs.container, &swift.ObjectsOpts{
+		Prefix: prefix,
+	})
+}
+
+func (scs SwiftCloudStorage) Close() error {
+	return nil
+}
-- 
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