lostluck commented on a change in pull request #11413: [BEAM-9746] check for 0
length copies from state
URL: https://github.com/apache/beam/pull/11413#discussion_r408509078
##########
File path: sdks/go/pkg/beam/core/runtime/harness/statemgr_test.go
##########
@@ -258,6 +261,167 @@ func TestStateChannel(t *testing.T) {
}
}
+// TestStateKeyReader validates ordinary Read cases
+func TestStateKeyReader(t *testing.T) {
+ const readLen = 4
+ tests := []struct {
+ name string
+ buflens []int // sizes of the buffers received on the state
channel.
+ numReads int
+ closed bool // tries to read from closed reader
+ noGet bool // tries to read from nil get response reader
+ }{
+ {
+ name: "emptyData",
+ buflens: []int{-1},
+ numReads: 1,
+ }, {
+ name: "singleBufferSingleRead",
+ buflens: []int{readLen},
+ numReads: 2,
+ }, {
+ name: "singleBufferMultipleReads",
+ buflens: []int{2 * readLen},
+ numReads: 3,
+ }, {
+ name: "singleBufferShortRead",
+ buflens: []int{readLen - 1},
+ numReads: 2,
+ }, {
+ name: "multiBuffer",
+ buflens: []int{readLen, readLen},
+ numReads: 3,
+ }, {
+ name: "multiBuffer-short-reads",
+ buflens: []int{readLen - 1, readLen - 1, readLen - 2},
+ numReads: 4,
+ }, {
+ name: "emptyDataFirst", // Shouldn't happen, but
not unreasonable to handle.
+ buflens: []int{-1, readLen, readLen},
+ numReads: 4,
+ }, {
+ name: "emptyDataMid", // Shouldn't happen, but not
unreasonable to handle.
+ buflens: []int{readLen, readLen, -1, readLen},
+ numReads: 5,
+ }, {
+ name: "emptyDataLast", // Shouldn't happen, but not
unreasonable to handle.
+ buflens: []int{readLen, readLen, -1},
+ numReads: 3,
+ }, {
+ name: "emptyDataLast-short",
+ buflens: []int{3*readLen - 2, -1},
+ numReads: 4,
+ }, {
+ name: "closed",
+ buflens: []int{-1, -1},
+ numReads: 1,
+ closed: true,
+ }, {
+ name: "noGet",
+ buflens: []int{-1},
+ numReads: 1,
+ noGet: true,
+ },
+ }
+ for _, test := range tests {
+ t.Run(test.name, func(t *testing.T) {
+ ctx, cancelFn :=
context.WithCancel(context.Background())
+ ch := &StateChannel{
+ id: "test",
+ requests: make(chan *fnpb.StateRequest),
+ responses: make(map[string]chan<-
*fnpb.StateResponse),
+ cancelFn: cancelFn,
+ DoneCh: ctx.Done(),
+ }
+
+ // Handle the channel behavior asynchronously.
+ go func() {
+ for i, buflen := range test.buflens {
+ token := []byte(strconv.Itoa(i))
+ var buf []byte
+ if buflen >= 0 {
+ buf = bytes.Repeat([]byte{42},
buflen)
+ }
+ // On the last request response pair,
send no token.
+ if i+1 == len(test.buflens) {
+ token = nil
+ }
+
+ req := <-ch.requests
+
+ if test.noGet {
+ ch.responses[req.Id] <-
&fnpb.StateResponse{
+ Id: req.Id,
+ }
+ return
+ }
+
+ ch.responses[req.Id] <-
&fnpb.StateResponse{
+ Id: req.Id,
+ Response:
&fnpb.StateResponse_Get{
+ Get:
&fnpb.StateGetResponse{
+
ContinuationToken: token,
+ Data:
buf,
+ },
+ },
+ }
+ }
+ }()
+
+ r := stateKeyReader{
+ ch: ch,
+ }
+
+ if test.closed {
+ err := r.Close()
+ if err != nil {
+ t.Errorf("unexpected error on Close(),
got %v", err)
+ }
+ }
+
+ var totalBytes int
+ for _, l := range test.buflens {
+ if l > 0 {
+ totalBytes += l
+ }
+ }
+ var finalerr error
+ var count, reads int
+
+ // Read all the bytes.
+ for count <= totalBytes {
+ reads++
+ b := make([]byte, readLen) // io.Read is keyed
off of length, not capacity.
+ n, err := r.Read(b)
+ if err != nil {
+ finalerr = err
+ break
+ }
+ count += n
+ // Special check to avoid spurious zero
elements.
+ if count == totalBytes && n == 0 {
+ t.Error("expected byte count read, last
read is 0, but no EOF")
+ }
+ }
+ if got, want := reads, test.numReads; got != want {
+ t.Errorf("read %d times, want %d", got, want)
+ }
+ if got, want := count, totalBytes; got != want {
+ t.Errorf("read %v bytes, want %v", got, want)
+ }
+ if test.closed {
+ if got, want := finalerr, errors.New("side
input closed"); !contains(got, want) {
+ t.Errorf("got err %v, want to contain
%v", got, want)
Review comment:
I don't like adding newlines to the test formatted output, since it messes
with the indentation of the results, possibly making it harder to read. I have
used %q which will quote and escape the Error() strings though.
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
With regards,
Apache Git Services
