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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| package processors | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "errors" | ||
| "io" | ||
|
|
||
| "github.com/slack-go/slack" | ||
| ) | ||
|
|
||
| type Player struct { | ||
| rs io.ReadSeeker | ||
|
|
||
| current state // current event pointers | ||
|
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| idx *index | ||
| } | ||
|
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| type state struct { | ||
| MessageIdx int // current message offset INDEX | ||
| Thread int // number of threads returned | ||
| File int // number of files returned | ||
| } | ||
|
|
||
| // counts holds total event counts for each event type. | ||
| type counts struct { | ||
| Messages int | ||
| Threads int | ||
| Files int | ||
| } | ||
|
|
||
| func NewPlayer(rs io.ReadSeeker) (*Player, error) { | ||
| idx, err := indexRecords(rs) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &Player{ | ||
| rs: rs, | ||
| idx: idx, | ||
| }, nil | ||
| } | ||
|
|
||
| type index struct { | ||
| count counts | ||
| // children may not be written in the same order as they are returned by | ||
| // API, therefore we need to keep track of the offset for each child. | ||
| children map[EventType]map[string]int64 | ||
| // messages are returned sequentially, so we can keep track of the offset | ||
| messages []int64 | ||
| } | ||
|
|
||
| func indexRecords(rs io.ReadSeeker) (*index, error) { | ||
| var idx = index{ | ||
| children: map[EventType]map[string]int64{ | ||
| EventThreadMessages: make(map[string]int64), | ||
| EventFiles: make(map[string]int64), | ||
| }, | ||
| } | ||
| dec := json.NewDecoder(rs) | ||
| for i := 0; ; i++ { | ||
| var event Event | ||
| offset, err := rs.Seek(0, io.SeekCurrent) // get current offset | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if err := dec.Decode(&event); err != nil { | ||
| if err == io.EOF { | ||
| break | ||
| } | ||
| return nil, err | ||
| } | ||
| switch event.Type { | ||
| case EventMessages: | ||
| idx.messages = append(idx.messages, offset) | ||
| idx.count.Messages++ | ||
| case EventThreadMessages: | ||
| idx.children[EventThreadMessages][event.Parent.ThreadTimestamp] = offset | ||
| idx.count.Threads++ | ||
| case EventFiles: | ||
| idx.children[EventFiles][event.Parent.ThreadTimestamp] = offset | ||
| idx.count.Files++ | ||
| } | ||
| } | ||
| if _, err := rs.Seek(0, io.SeekStart); err != nil { // reset offset | ||
| return nil, err | ||
| } | ||
| return &idx, nil | ||
| } | ||
|
|
||
| func (p *Player) Messages() ([]slack.Message, error) { | ||
| if p.current.MessageIdx >= p.idx.count.Messages { | ||
| return nil, ErrExhausted | ||
| } | ||
| offset := p.idx.messages[p.current.MessageIdx] | ||
| _, err := p.rs.Seek(offset, io.SeekStart) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| var event Event | ||
| if err := json.NewDecoder(p.rs).Decode(&event); err != nil { | ||
| return nil, err | ||
| } | ||
| p.current.MessageIdx++ | ||
| return event.Messages, nil | ||
| } | ||
|
|
||
| var ( | ||
| ErrNotFound = errors.New("not found") | ||
| ErrExhausted = errors.New("exhausted") | ||
| ) | ||
|
|
||
| func (p *Player) Thread(threadTS string) ([]slack.Message, error) { | ||
| // check if there are still threads to return | ||
| if p.current.Thread >= p.idx.count.Threads { | ||
| return nil, ErrExhausted | ||
| } | ||
|
|
||
| // BUG: more than 2 chunks of the same threadTS, currently gets overwritten | ||
| // in the indexing. Needs another map to keep track of the sequence. | ||
| offset, ok := p.idx.children[EventThreadMessages][threadTS] | ||
| if !ok { | ||
| return nil, ErrNotFound | ||
| } | ||
| _, err := p.rs.Seek(offset, io.SeekStart) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| var event Event | ||
| if err := json.NewDecoder(p.rs).Decode(&event); err != nil { | ||
| return nil, err | ||
| } | ||
| p.current.Thread++ | ||
| return event.Messages, nil | ||
| } |
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