Merge branch '8008-package-testing' refs #8008

[arvados.git] / sdk / go / manifest / manifest.go

diff --git a/sdk/go/manifest/manifest.go b/sdk/go/manifest/manifest.go
index 49faa01b4d56b2eb32ab0c60d7e68a0c4966df87..cf0ae85c5782a8848d234de10d3fce81b6e661cd 100644 (file)
--- a/sdk/go/manifest/manifest.go
+++ b/sdk/go/manifest/manifest.go
@@ -20,6 +20,7 @@ var LocatorPattern = regexp.MustCompile(
 
 type Manifest struct {
        Text string
+       Err  error
 }
 
 type BlockLocator struct {
@@ -43,12 +44,19 @@ type FileSegment struct {
        Len    int
 }
 
+// FileStreamSegment is a portion of a file described as a segment of a stream.
+type FileStreamSegment struct {
+       SegPos uint64
+       SegLen uint64
+       Name   string
+}
+
 // Represents a single line from a manifest.
 type ManifestStream struct {
-       StreamName string
-       Blocks     []string
-       FileTokens []string
-       Err        error
+       StreamName         string
+       Blocks             []string
+       FileStreamSegments []FileStreamSegment
+       Err                error
 }
 
 var escapeSeq = regexp.MustCompile(`\\([0-9]{3}|\\)`)
@@ -96,21 +104,21 @@ func ParseBlockLocator(s string) (b BlockLocator, err error) {
        return
 }
 
-func parseFileToken(tok string) (segPos, segLen uint64, name string, err error) {
+func parseFileStreamSegment(tok string) (ft FileStreamSegment, err error) {
        parts := strings.SplitN(tok, ":", 3)
        if len(parts) != 3 {
                err = ErrInvalidToken
                return
        }
-       segPos, err = strconv.ParseUint(parts[0], 10, 64)
+       ft.SegPos, err = strconv.ParseUint(parts[0], 10, 64)
        if err != nil {
                return
        }
-       segLen, err = strconv.ParseUint(parts[1], 10, 64)
+       ft.SegLen, err = strconv.ParseUint(parts[1], 10, 64)
        if err != nil {
                return
        }
-       name = UnescapeName(parts[2])
+       ft.Name = UnescapeName(parts[2])
        return
 }
 
@@ -127,12 +135,11 @@ func (s *ManifestStream) sendFileSegmentIterByName(filepath string, ch chan<- *F
        blockLens := make([]int, 0, len(s.Blocks))
        // This is what streamName+"/"+fileName will look like:
        target := "./" + filepath
-       for _, fTok := range s.FileTokens {
-               wantPos, wantLen, name, err := parseFileToken(fTok)
-               if err != nil {
-                       // Skip (!) invalid file tokens.
-                       continue
-               }
+       for _, fTok := range s.FileStreamSegments {
+               wantPos := fTok.SegPos
+               wantLen := fTok.SegLen
+               name := fTok.Name
+
                if s.StreamName+"/"+name != target {
                        continue
                }
@@ -183,28 +190,40 @@ func (s *ManifestStream) sendFileSegmentIterByName(filepath string, ch chan<- *F
 
 func parseManifestStream(s string) (m ManifestStream) {
        tokens := strings.Split(s, " ")
+
        m.StreamName = UnescapeName(tokens[0])
+       if m.StreamName != "." && !strings.HasPrefix(m.StreamName, "./") {
+               m.Err = fmt.Errorf("Invalid stream name: %s", m.StreamName)
+               return
+       }
+
        tokens = tokens[1:]
        var i int
-       for i = range tokens {
+       for i = 0; i < len(tokens); i++ {
                if !blockdigest.IsBlockLocator(tokens[i]) {
                        break
                }
        }
        m.Blocks = tokens[:i]
-       m.FileTokens = tokens[i:]
+       fileTokens := tokens[i:]
 
-       if m.StreamName != "." && !strings.HasPrefix(m.StreamName, "./") {
-               m.Err = fmt.Errorf("Invalid stream name: %s", m.StreamName)
+       if len(m.Blocks) == 0 {
+               m.Err = fmt.Errorf("No block locators found")
                return
        }
 
-       for _, ft := range m.FileTokens {
-               _, _, _, err := parseFileToken(ft)
+       if len(fileTokens) == 0 {
+               m.Err = fmt.Errorf("No file tokens found")
+               return
+       }
+
+       for _, ft := range fileTokens {
+               pft, err := parseFileStreamSegment(ft)
                if err != nil {
                        m.Err = fmt.Errorf("Invalid file token: %s", ft)
                        break
                }
+               m.FileStreamSegments = append(m.FileStreamSegments, pft)
        }
 
        return
@@ -246,28 +265,24 @@ func (m *Manifest) FileSegmentIterByName(filepath string) <-chan *FileSegment {
        return ch
 }
 
-type ManifestBlockLocator struct {
-       Locator blockdigest.BlockLocator
-       Err     error
-}
-
 // Blocks may appear mulitple times within the same manifest if they
 // are used by multiple files. In that case this Iterator will output
 // the same block multiple times.
-func (m *Manifest) BlockIterWithDuplicates() <-chan ManifestBlockLocator {
-       blockChannel := make(chan ManifestBlockLocator)
+//
+// In order to detect parse errors, caller must check m.Err after the returned channel closes.
+func (m *Manifest) BlockIterWithDuplicates() <-chan blockdigest.BlockLocator {
+       blockChannel := make(chan blockdigest.BlockLocator)
        go func(streamChannel <-chan ManifestStream) {
                for ms := range streamChannel {
                        if ms.Err != nil {
-                               blockChannel <- ManifestBlockLocator{Locator: blockdigest.BlockLocator{}, Err: ms.Err}
+                               m.Err = ms.Err
                                continue
                        }
                        for _, block := range ms.Blocks {
-                               b, err := blockdigest.ParseBlockLocator(block)
-                               if err == nil {
-                                       blockChannel <- ManifestBlockLocator{b, nil}
+                               if b, err := blockdigest.ParseBlockLocator(block); err == nil {
+                                       blockChannel <- b
                                } else {
-                                       blockChannel <- ManifestBlockLocator{Locator: blockdigest.BlockLocator{}, Err: err}
+                                       m.Err = err
                                }
                        }
                }