Idempotent storager delete operation (#20)

* Idempotent storager delete operation

* modify comment for delete

go.mod

@@ -4,7 +4,7 @@ go 1.14
 
 require (
 	github.com/aliyun/aliyun-oss-go-sdk v2.1.8+incompatible
-	github.com/aos-dev/go-integration-test/v3 v3.0.0
+	github.com/aos-dev/go-integration-test/v3 v3.0.1-0.20210506085629-1ace601e00c6
 	github.com/aos-dev/go-storage/v3 v3.6.1-0.20210427074731-1b3b4e86c950
 	github.com/baiyubin/aliyun-sts-go-sdk v0.0.0-20180326062324-cfa1a18b161f // indirect
 	github.com/google/uuid v1.2.0

go.sum

@@ -1,14 +1,11 @@
-github.com/Xuanwo/templateutils v0.0.0-20201216100309-46f73cd4e4b1/go.mod h1:x0qS7gfgEm24b8V9U+0zBEBAu/VpxZhO/+EWtpgEgDw=
 github.com/Xuanwo/templateutils v0.1.0 h1:WpkWOqQtIQ2vAIpJLa727DdN8WtxhUkkbDGa6UhntJY=
 github.com/Xuanwo/templateutils v0.1.0/go.mod h1:OdE0DJ+CJxDBq6psX5DPV+gOZi8bhuHuVUpPCG++Wb8=
 github.com/aliyun/aliyun-oss-go-sdk v2.1.8+incompatible h1:hLUNPbx10wawWW7DeNExvTrlb90db3UnnNTFKHZEFhE=
 github.com/aliyun/aliyun-oss-go-sdk v2.1.8+incompatible/go.mod h1:T/Aws4fEfogEE9v+HPhhw+CntffsBHJ8nXQCwKr0/g8=
-github.com/aos-dev/go-integration-test/v3 v3.0.0 h1:rxIc7YBfiw9JS5JiVU4BZAqQqoKJemIftFaeJpYCb5M=
-github.com/aos-dev/go-integration-test/v3 v3.0.0/go.mod h1:woC3E9Ld1G/Cpo2tSEQ+iwIr4MMdgf+L/8UuyJOE11Q=
-github.com/aos-dev/go-storage/v3 v3.5.0/go.mod h1:PZJT0Ta7YxVM5QoYoh8Q/X4I6e/z/7gOJqm85Aib4nY=
+github.com/aos-dev/go-integration-test/v3 v3.0.1-0.20210506085629-1ace601e00c6 h1:/GrJCqznHBjWWj3x2K5KU6hKG6BfR211bRJAFGdH7bc=
+github.com/aos-dev/go-integration-test/v3 v3.0.1-0.20210506085629-1ace601e00c6/go.mod h1:D05/hz2AbZFBucYlzvpYBb62v17SgKUNhi3lxuUQLj4=
 github.com/aos-dev/go-storage/v3 v3.6.1-0.20210427074731-1b3b4e86c950 h1:3ZsfgDAUF171rIrFdYjhr8P3WyxzR4IwxWGbGxkCRkA=
 github.com/aos-dev/go-storage/v3 v3.6.1-0.20210427074731-1b3b4e86c950/go.mod h1:wzxhpUa73aCdTDRG0sHjNnnmXa9rC/ahJnk7hKOV6Pw=
-github.com/aos-dev/specs/go v0.0.0-20210312090615-23109627848b/go.mod h1:XTNlLZtPA1inITyDH5hNnQXVjvvKUvo+lurs5GYB8NA=
 github.com/aos-dev/specs/go v0.0.0-20210427074008-93183332d504 h1:vHxnQOXlz/X8/Co1ep57yc34Xso+f2+xt4Q2dMJVHA4=
 github.com/aos-dev/specs/go v0.0.0-20210427074008-93183332d504/go.mod h1:gNah3KaPJEfysh7uCCX+sYjQC3g2yx2VgBkFlT945Ws=
 github.com/baiyubin/aliyun-sts-go-sdk v0.0.0-20180326062324-cfa1a18b161f h1:ZNv7On9kyUzm7fvRZumSyy/IUiSC7AzL0I1jKKtwooA=
@@ -19,9 +16,8 @@ github.com/dave/gopackages v0.0.0-20170318123100-46e7023ec56e/go.mod h1:i00+b/gK
 github.com/dave/jennifer v1.2.0/go.mod h1:fIb+770HOpJ2fmN9EPPKOqm1vMGhB+TwXKMZhrIygKg=
 github.com/dave/kerr v0.0.0-20170318121727-bc25dd6abe8e/go.mod h1:qZqlPyPvfsDJt+3wHJ1EvSXDuVjFTK0j2p/ca+gtsb8=
 github.com/dave/rebecca v0.9.1/go.mod h1:N6XYdMD/OKw3lkF3ywh8Z6wPGuwNFDNtWYEMFWEmXBA=
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/golang/mock v1.5.0 h1:jlYHihg//f7RRwuPfptm04yp4s7O6Kw8EZiVYIGcH0g=
 github.com/golang/mock v1.5.0/go.mod h1:CWnOUgYIOo4TcNZ0wHX3YZCqsaM1I1Jvs6v3mP3KVu8=
 github.com/google/pprof v0.0.0-20181127221834-b4f47329b966/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
@@ -39,7 +35,6 @@ github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORN
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
-github.com/pelletier/go-toml v1.8.1/go.mod h1:T2/BmBdy8dvIRq1a/8aqjN41wvWlN4lrapLU/GW4pbc=
 github.com/pelletier/go-toml v1.9.0 h1:NOd0BRdOKpPf0SxkL3HxSQOG7rNh+4kl6PHcBPFs7Q0=
 github.com/pelletier/go-toml v1.9.0/go.mod h1:u1nR/EPcESfeI/szUZKdtJ0xRNbUoANCkoOuaOx1Y+c=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
@@ -53,7 +48,6 @@ github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d/go.mod h1
 github.com/smartystreets/goconvey v1.6.4 h1:fv0U8FUIMPNf1L9lnHLvLhgicrIVChEkdzIKYqbNC9s=
 github.com/smartystreets/goconvey v1.6.4/go.mod h1:syvi0/a8iFYH4r/RixwvyeAJjdLS9QV7WQ/tjFTllLA=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
@@ -88,6 +82,5 @@ gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/src-d/go-billy.v4 v4.3.0 h1:KtlZ4c1OWbIs4jCv5ZXrTqG8EQocr0g/d4DjNg70aek=
 gopkg.in/src-d/go-billy.v4 v4.3.0/go.mod h1:tm33zBoOwxjYHZIE+OV8bxTWFMJLrconzFMd38aARFk=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

storage.go

@@ -63,6 +63,11 @@ func (s *Storage) createAppend(ctx context.Context, path string, opt pairStorage
 func (s *Storage) delete(ctx context.Context, path string, opt pairStorageDelete) (err error) {
 	rp := s.getAbsPath(path)
 
+	// OSS DeleteObject is idempotent, so we don't need to check NoSuchKey error.
+	//
+	// References
+	// - [AOS-46](https://github.com/aos-dev/specs/blob/master/rfcs/46-idempotent-delete.md)
+	// - https://help.aliyun.com/document_detail/31982.html
 	err = s.bucket.DeleteObject(rp)
 	if err != nil {
 		return err
@@ -301,5 +306,5 @@ func (s *Storage) writeAppend(ctx context.Context, o *Object, r io.Reader, size
 
 	o.SetAppendOffset(offset)
 
-	return offset, err
+	return size, err
 }