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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| package command | ||
|
|
||
| import "errors" | ||
|
|
||
| var ( | ||
| ErrSyntaxError = errors.New("ERR syntax error") | ||
| ErrInvalidStreamID = errors.New("ERR Invalid stream ID specified as stream command argument") | ||
| ) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| package command | ||
|
|
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| import ( | ||
| "errors" | ||
| "fmt" | ||
| "math" | ||
| "strconv" | ||
| "strings" | ||
|
|
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| "github.com/codecrafters-io/redis-starter-go/internal/client" | ||
| "github.com/codecrafters-io/redis-starter-go/pkg/keyval" | ||
| "github.com/codecrafters-io/redis-starter-go/pkg/resp" | ||
| ) | ||
|
|
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| type XRange struct { | ||
| kv keyval.KV | ||
| } | ||
|
|
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| var ( | ||
| ErrWrongArgCount = errors.New("wrong number of arguments for 'xrange' command") | ||
| ) | ||
|
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| func (x *XRange) Execute(_ *client.Client, wr *resp.Writer, args []*resp.Resp) error { | ||
| if err := x.validateArgs(args); err != nil { | ||
| return wr.WriteError(err) | ||
| } | ||
|
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| streamID := args[0].String() | ||
| start, end, count, err := x.parseArgs(args) | ||
| if err != nil { | ||
| return wr.WriteError(err) | ||
| } | ||
|
|
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| stream, err := x.kv.GetStream(streamID, false) | ||
| if err != nil { | ||
| return wr.WriteError(err) | ||
| } | ||
| if stream == nil { | ||
| return wr.WriteStringSlice([]string{}) | ||
| } | ||
|
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| entries := stream.Range(start, end, count) | ||
| result := x.formatEntries(entries) | ||
|
|
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| return wr.WriteSlice(result) | ||
| } | ||
|
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| func (x *XRange) validateArgs(args []*resp.Resp) error { | ||
| if len(args) < 3 { | ||
| return ErrWrongArgCount | ||
| } | ||
| if len(args) > 5 || len(args) == 4 { | ||
| return ErrSyntaxError | ||
| } | ||
| return nil | ||
| } | ||
|
|
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| func (x *XRange) parseArgs(args []*resp.Resp) (start, end string, count uint64, err error) { | ||
| start, err = parseStreamID(args[1].String(), true) | ||
| if err != nil { | ||
| return | ||
| } | ||
| end, err = parseStreamID(args[2].String(), false) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| if len(args) == 5 { | ||
| if strings.ToUpper(args[3].String()) != "COUNT" { | ||
| err = ErrSyntaxError | ||
| return | ||
| } | ||
| count, err = args[4].Uint64() | ||
| if err != nil { | ||
| return | ||
| } | ||
| if count < 0 { | ||
| count = 0 | ||
| } | ||
| } | ||
| return | ||
| } | ||
|
|
||
| func (x *XRange) formatEntries(entries []keyval.StreamEntry) []any { | ||
| var result []any | ||
| for _, entry := range entries { | ||
| entryResult := []any{entry.ID} | ||
| var entryFields []any | ||
| for _, field := range entry.Fields { | ||
| entryFields = append(entryFields, field[0], field[1]) | ||
| } | ||
| entryResult = append(entryResult, entryFields) | ||
| result = append(result, entryResult) | ||
| } | ||
| return result | ||
| } | ||
|
|
||
| func parseStreamID(streamID string, start bool) (string, error) { | ||
| if streamID == "-" || streamID == "+" { | ||
| return streamID, nil | ||
| } | ||
|
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| parts := strings.Split(streamID, "-") | ||
| if len(parts) > 2 { | ||
| return "", ErrSyntaxError | ||
| } | ||
|
|
||
| if len(parts) == 2 { | ||
| if _, err := strconv.ParseUint(parts[1], 10, 64); err != nil { | ||
| return "", ErrInvalidStreamID | ||
| } | ||
| return streamID, nil | ||
| } | ||
|
|
||
| if start { | ||
| return fmt.Sprintf("%s-0", parts[0]), nil | ||
| } | ||
| return fmt.Sprintf("%s-%d", parts[0], uint64(math.MaxUint64)), nil | ||
| } |
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