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| 1 | package host |
| 2 | |
| 3 | import ( |
| 4 | "errors" |
| 5 | "github.com/carlosframework/platform/internal/moves" |
| 6 | ) |
| 7 | |
| 8 | var errRootFloorHistory = errors.New("root floor history unavailable") |
| 9 | |
| 10 | // This is a reconstruction decision, not an authority source. history is a |
| 11 | // complete root-authorized reconstruction; legacy supplies only extra denies. |
| 12 | // A nil history cannot be upgraded into authority by today's remote object. |
| 13 | func reconstructRootFloor(history, remote *moves.Floor, legacy []*moves.Floor) (*moves.Floor, error) { |
| 14 | if history == nil { |
| 15 | return nil, errRootFloorHistory |
| 16 | } |
| 17 | out := *history |
| 18 | valid := func(f *moves.Floor) bool { return f != nil && f.Min > 0 && validFloorRelease(f.MinRelease) } |
| 19 | if !valid(&out) { |
| 20 | return nil, errRootFloorHistory |
| 21 | } |
| 22 | for _, f := range legacy { |
| 23 | if !valid(f) { |
| 24 | return nil, errRootFloorHistory |
| 25 | } |
| 26 | if err := floorRegression(&out, f); err == nil { |
| 27 | out = *f |
| 28 | continue |
| 29 | } |
| 30 | // Independent maxima: a larger protocol and a larger release can occur |
| 31 | // in different files. Never choose just one file by its release string. |
| 32 | if f.Min > out.Min { |
| 33 | out.Min = f.Min |
| 34 | } |
| 35 | if ok, _ := moves.ReleaseAtOrAbove(f.MinRelease, out.MinRelease); ok { |
| 36 | out.MinRelease = f.MinRelease |
| 37 | } |
| 38 | } |
| 39 | if remote == nil { |
| 40 | if out != *history { |
| 41 | return &out, errRootFloorHistory |
| 42 | } |
| 43 | return &out, nil |
| 44 | } |
| 45 | if !valid(remote) { |
| 46 | return &out, errRootFloorHistory |
| 47 | } |
| 48 | if err := floorRegression(&out, remote); err != nil { |
| 49 | return &out, err |
| 50 | } |
| 51 | next := *remote |
| 52 | return &next, nil |
| 53 | } |
| 54 | |
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