| 1 | package host |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "errors" |
| 6 | "io" |
| 7 | "os" |
| 8 | "path/filepath" |
| 9 | "strings" |
| 10 | |
| 11 | "github.com/carlosframework/platform/internal/moves" |
| 12 | "github.com/carlosframework/platform/internal/release" |
| 13 | "github.com/carlosframework/platform/internal/rootparticipation" |
| 14 | "github.com/carlosframework/platform/internal/rootstate" |
| 15 | ) |
| 16 | |
| 17 | func rootMovesFloorIdentity() (rootFloorIdentity, bool, error) { |
| 18 | l, required, err := rootparticipation.OpenForUpdate() |
| 19 | if l.State != nil { |
| 20 | defer l.State.Close() |
| 21 | } |
| 22 | if err != nil || !required { |
| 23 | return rootFloorIdentity{}, required, err |
| 24 | } |
| 25 | c, err := l.RecoveryCensus() |
| 26 | id := rootFloorIdentity{Deployment: os.Getenv("CARLOS_DEPLOYMENT_BUCKET"), Box: c.Box, Enrollment: c.Enrollment} |
| 27 | if err == nil && id.Deployment == "" { |
| 28 | err = errRootFloorHistory |
| 29 | } |
| 30 | return id, true, err |
| 31 | } |
| 32 | |
| 33 | type rootFloorIdentitySource func() (rootFloorIdentity, bool, error) |
| 34 | |
| 35 | func (source rootFloorIdentitySource) read() (rootFloorIdentity, bool, error) { |
| 36 | if source == nil { |
| 37 | return rootFloorIdentity{}, false, nil |
| 38 | } |
| 39 | return source() |
| 40 | } |
| 41 | |
| 42 | // Root callers retain main's floor implementation until a census exists. |
| 43 | func readEffectiveMovesFloor(source rootFloorIdentitySource, opt, dd string) (*moves.Floor, error) { |
| 44 | id, required, err := source.read() |
| 45 | if err != nil { |
| 46 | return nil, err |
| 47 | } |
| 48 | if !required { |
| 49 | return readLocalFloor(dd) |
| 50 | } |
| 51 | return readRootProtocolBound(rootFloorDir(opt), id) |
| 52 | } |
| 53 | |
| 54 | func readRootProtocolBound(dir string, id rootFloorIdentity) (*moves.Floor, error) { |
| 55 | f, err := openRootProtocolFloors(dir, id, false) |
| 56 | if errors.Is(err, os.ErrNotExist) { |
| 57 | public, e := rootstate.Open(dir, false, true) |
| 58 | if errors.Is(e, os.ErrNotExist) { |
| 59 | return nil, nil |
| 60 | } |
| 61 | if e != nil { |
| 62 | return nil, e |
| 63 | } |
| 64 | defer public.Close() |
| 65 | return (rootMovesFloors{public: public, identity: id}).localBound() |
| 66 | } |
| 67 | if err != nil { |
| 68 | return nil, err |
| 69 | } |
| 70 | defer f.close() |
| 71 | return f.localBound() |
| 72 | } |
| 73 | |
| 74 | func withEffectiveMovesFloorLock(source rootFloorIdentitySource, opt, dd string, create bool, fn func() error) error { |
| 75 | id, required, err := source.read() |
| 76 | if err != nil { |
| 77 | return err |
| 78 | } |
| 79 | if !required { |
| 80 | return withFloorLock(dd, create, func(*movesDir) error { return fn() }) |
| 81 | } |
| 82 | f, err := openRootMovesFloors(opt, id, true) |
| 83 | if err != nil { |
| 84 | return err |
| 85 | } |
| 86 | defer f.close() |
| 87 | unlock, err := f.private.Lock(context.Background(), "floor.lock") |
| 88 | if err != nil { |
| 89 | return err |
| 90 | } |
| 91 | defer unlock() |
| 92 | seeds, err := openRootProtocolFloors(rootSeedsFloorDir(opt), id, true) |
| 93 | if err != nil { |
| 94 | return err |
| 95 | } |
| 96 | defer seeds.close() |
| 97 | unlockSeeds, err := seeds.private.Lock(context.Background(), "floor.lock") |
| 98 | if err != nil { |
| 99 | return err |
| 100 | } |
| 101 | defer unlockSeeds() |
| 102 | return fn() |
| 103 | } |
| 104 | |
| 105 | // Read both mirrors independently. Missing files add nothing; a malformed |
| 106 | // bounded file quarantines, while any usable sibling still contributes a deny. |
| 107 | func rootFloorLegacy(dd string) ([]*moves.Floor, error) { |
| 108 | return rootProtocolLegacy(dd, moves.FloorFile, moves.FloorMinReleaseFile) |
| 109 | } |
| 110 | func rootProtocolLegacy(dd, jsonFile, lineFile string) ([]*moves.Floor, error) { |
| 111 | var legacy []*moves.Floor |
| 112 | fl, jerr := readRootLegacyProtocolJSON(dd, jsonFile) |
| 113 | if fl != nil { |
| 114 | if validRootFloor(fl) { |
| 115 | legacy = append(legacy, fl) |
| 116 | } else { |
| 117 | jerr = errors.Join(jerr, errRootFloorHistory) |
| 118 | } |
| 119 | } |
| 120 | file, err := openBeneath(dd, strings.Split(filepath.ToSlash(lineFile), "/")...) |
| 121 | if errors.Is(err, os.ErrNotExist) { |
| 122 | return legacy, jerr |
| 123 | } |
| 124 | if err != nil { |
| 125 | return legacy, errors.Join(jerr, err) |
| 126 | } |
| 127 | defer file.Close() |
| 128 | st, err := file.Stat() |
| 129 | if err != nil { |
| 130 | return legacy, errors.Join(jerr, err) |
| 131 | } |
| 132 | if !st.Mode().IsRegular() || st.Size() > 256 { |
| 133 | return legacy, errors.Join(jerr, errRootFloorHistory) |
| 134 | } |
| 135 | raw, err := io.ReadAll(io.LimitReader(file, 257)) |
| 136 | line := strings.TrimSpace(string(raw)) |
| 137 | if err != nil || !validFloorRelease(line) { |
| 138 | return legacy, errors.Join(jerr, err, errRootFloorHistory) |
| 139 | } |
| 140 | legacy = append(legacy, &moves.Floor{Min: 1, MinRelease: line}) |
| 141 | return legacy, jerr |
| 142 | } |
| 143 | |
| 144 | func refreshRootMovesFloor(ctx context.Context, store release.Store, opt, dd string, id rootFloorIdentity) error { |
| 145 | f, err := openRootMovesFloors(opt, id, true) |
| 146 | if err != nil { |
| 147 | return err |
| 148 | } |
| 149 | defer f.close() |
| 150 | remote, rerr := moves.ReadFloor(ctx, store) |
| 151 | legacy, lerr := rootFloorLegacy(dd) |
| 152 | return f.refresh(ctx, remote, legacy, errors.Join(rerr, lerr)) |
| 153 | } |
| 154 | |
| 155 | // Reading the final projection can race the writer's last directory sync. |
| 156 | // Sync after reading makes those already-fsynced file bytes durable before the |
| 157 | // honest agent advertises them, even if root died just after the rename. |
| 158 | func readRootFloorProjection(opt string) (rootFloorProjection, error) { |
| 159 | return readRootProtocolProjection(rootFloorDir(opt)) |
| 160 | } |
| 161 | func readRootProtocolProjection(dir string) (rootFloorProjection, error) { |
| 162 | s, err := rootstate.Open(dir, false, true) |
| 163 | if err != nil { |
| 164 | return rootFloorProjection{}, err |
| 165 | } |
| 166 | defer s.Close() |
| 167 | var p rootFloorProjection |
| 168 | raw, err := s.Read(rootFloorProjectionFile) |
| 169 | if err != nil { |
| 170 | return p, err |
| 171 | } |
| 172 | if err = rootstate.Sync(s); err != nil { |
| 173 | return p, err |
| 174 | } |
| 175 | if len(raw) > movesFloorMaxBytes || rootparticipation.Decode(raw, &p) != nil || !p.Accepted || !p.rootFloorRecord.valid(p.Identity) { |
| 176 | return p, errRootFloorHistory |
| 177 | } |
| 178 | f := rootMovesFloors{public: s, identity: p.Identity} |
| 179 | bound, err := f.selector() |
| 180 | if err != nil || string(rootFloorLine(bound)) != string(rootFloorLine(p.Floor)) { |
| 181 | return p, errRootFloorHistory |
| 182 | } |
| 183 | return p, nil |
| 184 | } |
| 185 | |
| 186 | func readRootLegacyProtocolJSON(dd, name string) (*moves.Floor, error) { |
| 187 | file, err := openBeneath(dd, strings.Split(filepath.ToSlash(name), "/")...) |
| 188 | if errors.Is(err, os.ErrNotExist) { |
| 189 | return nil, nil |
| 190 | } |
| 191 | if err != nil { |
| 192 | return nil, err |
| 193 | } |
| 194 | defer file.Close() |
| 195 | st, err := file.Stat() |
| 196 | if err != nil { |
| 197 | return nil, err |
| 198 | } |
| 199 | if !st.Mode().IsRegular() || st.Size() > movesFloorMaxBytes { |
| 200 | return nil, errRootFloorHistory |
| 201 | } |
| 202 | raw, err := io.ReadAll(io.LimitReader(file, movesFloorMaxBytes+1)) |
| 203 | if err != nil { |
| 204 | return nil, err |
| 205 | } |
| 206 | var floor moves.Floor |
| 207 | err = rootparticipation.Decode(raw, &floor) |
| 208 | if !validRootFloor(&floor) { |
| 209 | return nil, errors.Join(err, errRootFloorHistory) |
| 210 | } |
| 211 | return &floor, err |
| 212 | } |
| 213 | |
amadan