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impl pagination, split exec log out of task list
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| package taskengine | ||
|
|
||
| import ( | ||
| "encoding/base64" | ||
| "encoding/json" | ||
| "strconv" | ||
|
|
||
| "github.com/oklog/ulid/v2" | ||
| ) | ||
|
|
||
| type CursorDirection string | ||
|
|
||
| const ( | ||
| CursorDirectionNext = CursorDirection("next") | ||
| CursorDirectionPrevious = CursorDirection("prev") | ||
| ) | ||
|
|
||
| type Cursor struct { | ||
| Direction CursorDirection `json:"d"` | ||
| Position string `json:"p"` | ||
|
|
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| parsePos bool `json:"-"` | ||
| int64Pos int64 `json:"-"` | ||
| ulidPos ulid.ULID `json:"-"` | ||
| } | ||
|
|
||
| func CursorFromString(data string) (*Cursor, error) { | ||
| c := &Cursor{ | ||
| Direction: CursorDirectionNext, | ||
| Position: "0", | ||
| parsePos: false, | ||
| int64Pos: 0, | ||
| ulidPos: ulid.Zero, | ||
| } | ||
|
|
||
| decoded, err := base64.StdEncoding.DecodeString(data) | ||
| if err != nil { | ||
| return c, err | ||
| } | ||
|
|
||
| if err = json.Unmarshal(decoded, &c); err == nil { | ||
| return c, nil | ||
| } else { | ||
| return c, err | ||
| } | ||
| } | ||
|
|
||
| func NewCursor(direction CursorDirection, position string) *Cursor { | ||
| return &Cursor{ | ||
| Direction: direction, | ||
| Position: position, | ||
|
|
||
| parsePos: false, | ||
| int64Pos: 0, | ||
| } | ||
| } | ||
| func (c *Cursor) String() string { | ||
| var d []byte | ||
| d, err := json.Marshal(c) | ||
|
|
||
| if err != nil { | ||
| return "" | ||
| } | ||
|
|
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| encoded := base64.StdEncoding.EncodeToString(d) | ||
|
|
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| return encoded | ||
| } | ||
|
|
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| // Given a value, return true if the value is after the cursor | ||
| func (c *Cursor) AfterInt64(value int64) bool { | ||
| if !c.parsePos { | ||
| c.int64Pos, _ = strconv.ParseInt(c.Position, 10, 64) | ||
| c.parsePos = true | ||
| } | ||
| if c.Direction == CursorDirectionNext { | ||
| return c.int64Pos <= value | ||
| } | ||
|
|
||
| return c.int64Pos >= value | ||
| } | ||
|
|
||
| // Given a value, return true if the value is after the cursor | ||
| func (c *Cursor) AfterUlid(value ulid.ULID) bool { | ||
| if !c.parsePos { | ||
| var err error | ||
| c.ulidPos, err = ulid.Parse(c.Position) | ||
| if err != nil { | ||
| c.ulidPos = ulid.Zero | ||
| } | ||
| c.parsePos = true | ||
| } | ||
| if c.Direction == CursorDirectionNext { | ||
| return c.ulidPos.Compare(value) < 0 | ||
| } | ||
| return c.ulidPos.Compare(value) > 0 | ||
| } |
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