| 1 | package host |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "context" |
| 6 | "errors" |
| 7 | "fmt" |
| 8 | "io" |
| 9 | "os" |
| 10 | "strings" |
| 11 | |
| 12 | "github.com/carlosframework/platform/internal/hostbox" |
| 13 | "github.com/carlosframework/platform/internal/hostclaim" |
| 14 | "github.com/carlosframework/platform/internal/hostfiles" |
| 15 | "github.com/carlosframework/platform/internal/hostwrite" |
| 16 | "github.com/carlosframework/platform/internal/instancefs" |
| 17 | "github.com/carlosframework/platform/internal/lease" |
| 18 | "github.com/carlosframework/platform/internal/registry" |
| 19 | "github.com/carlosframework/platform/internal/release" |
| 20 | ) |
| 21 | |
| 22 | type filesSeedOperation struct { |
| 23 | ctx context.Context |
| 24 | claims release.Store |
| 25 | registry *registry.Registry |
| 26 | actor hostbox.Actor |
| 27 | files *movesFiles |
| 28 | selected filesSeedSelection |
| 29 | bound servingArtifactIdentity |
| 30 | stats hostfiles.SyncStats |
| 31 | } |
| 32 | |
| 33 | func (s *filesSeedOperation) reportSkipped(out io.Writer, host string) error { |
| 34 | for _, path := range s.stats.TooLarge { |
| 35 | if _, err := fmt.Fprintf(out, "Host %q: skipped file %q: exceeds 64 MiB and will not be restored on a later cold wake.\n", host, path); err != nil { |
| 36 | return err |
| 37 | } |
| 38 | } |
| 39 | for _, path := range s.stats.NotRegular { |
| 40 | if _, err := fmt.Fprintf(out, "Host %q: skipped file %q: not a regular file.\n", host, path); err != nil { |
| 41 | return err |
| 42 | } |
| 43 | } |
| 44 | return nil |
| 45 | } |
| 46 | |
| 47 | // The private provider is freshly opened. No live provider or mutex-bearing |
| 48 | // owner is copied or modified. The command binds admission before materializing. |
| 49 | func newFilesSeedProvider(ctx context.Context, source *movesFilesSource, claims release.Store, data lease.VersionedStore, actor hostbox.Actor, reg *registry.Registry, selected filesSeedSelection) (*movesFiles, *filesSeedOperation, error) { |
| 50 | if ctx == nil || reg == nil || selected.State != "eligible" { |
| 51 | return nil, nil, hostbox.ErrUnsupported |
| 52 | } |
| 53 | opened, err := source.Open(ctx, claims, data, actor) |
| 54 | if err != nil { |
| 55 | return nil, nil, err |
| 56 | } |
| 57 | f, ok := opened.(*movesFiles) |
| 58 | if !ok { |
| 59 | return nil, nil, hostbox.ErrUnsupported |
| 60 | } |
| 61 | op := &filesSeedOperation{ctx: ctx, claims: claims, registry: reg, actor: actor, files: f, selected: selected} |
| 62 | f.Seed = op |
| 63 | return f, op, nil |
| 64 | } |
| 65 | |
| 66 | func (s *filesSeedOperation) admitted(ctx context.Context, o hostclaim.Observed) error { |
| 67 | if s == nil || s.ctx == nil || s.ctx.Err() != nil || s.bound != (servingArtifactIdentity{}) || s.selected.State != "eligible" { |
| 68 | return hostbox.ErrChanged |
| 69 | } |
| 70 | current, err := servingWriterIdentity(o, s.actor.Box, s.actor.Region) |
| 71 | if err != nil { |
| 72 | return err |
| 73 | } |
| 74 | old := s.selected.Observation.Claim.Holder |
| 75 | if current.Host != s.selected.Observation.Host || current.Incarnation != old.Incarnation || current.Location != old.Location || current.Session <= old.Session || current.Generation == old.Generation { |
| 76 | return hostbox.ErrChanged |
| 77 | } |
| 78 | row, err := s.registry.Get(o.Host) |
| 79 | if err != nil { |
| 80 | return err |
| 81 | } |
| 82 | selected, err := inspectFilesSeed(ctx, s.claims, s.files, o, s.actor, row) |
| 83 | if err != nil { |
| 84 | return err |
| 85 | } |
| 86 | if selected.State != "eligible" { |
| 87 | return hostfiles.ErrManifestExists |
| 88 | } |
| 89 | s.bound = current |
| 90 | return nil |
| 91 | } |
| 92 | |
| 93 | func (s *filesSeedOperation) check(ctx context.Context, o hostclaim.Observed, in ClaimLaunchInputs) error { |
| 94 | if s == nil || s.ctx == nil || s.ctx.Err() != nil || in.Empty || in.Prepared || in.Admission.NewGeneration == "" { |
| 95 | return hostbox.ErrChanged |
| 96 | } |
| 97 | current, err := servingWriterIdentity(o, s.actor.Box, s.actor.Region) |
| 98 | if err != nil || current != s.bound || current.Generation != in.Admission.NewGeneration { |
| 99 | return hostbox.ErrChanged |
| 100 | } |
| 101 | row, err := s.registry.Get(o.Host) |
| 102 | if err != nil { |
| 103 | return err |
| 104 | } |
| 105 | selected, err := inspectFilesSeed(ctx, s.claims, s.files, o, s.actor, row) |
| 106 | if err != nil { |
| 107 | return err |
| 108 | } |
| 109 | if selected.State != "eligible" { |
| 110 | return hostfiles.ErrManifestExists |
| 111 | } |
| 112 | _, err = s.files.proveOrigins(ctx, o, in.Admission, current.Location, []string{current.Generation}) |
| 113 | return err |
| 114 | } |
| 115 | |
| 116 | func (s *filesSeedOperation) stage(ctx context.Context, o hostclaim.Observed, in ClaimLaunchInputs, work hostwrite.Work, p *hostfiles.Publisher, env claimEnvFile) error { |
| 117 | if err := s.check(ctx, o, in); err != nil { |
| 118 | return err |
| 119 | } |
| 120 | var root *os.File |
| 121 | var wake hostfiles.WakeState |
| 122 | err := work.With(ctx, in.Identity, func() error { |
| 123 | var err error |
| 124 | root, err = instancefs.OpenDirBeneath(env.Dir, o.Host) |
| 125 | if err != nil { |
| 126 | return err |
| 127 | } |
| 128 | wake, err = hostfiles.ExportWake(s.registry, o.Host) |
| 129 | return err |
| 130 | }) |
| 131 | if root != nil { |
| 132 | defer root.Close() |
| 133 | } |
| 134 | if err != nil { |
| 135 | return err |
| 136 | } |
| 137 | before, err := root.Stat() |
| 138 | if err != nil { |
| 139 | return err |
| 140 | } |
| 141 | s.stats, err = hostfiles.Seed(ctx, p, root, wake, nil) |
| 142 | if err != nil { |
| 143 | return err |
| 144 | } |
| 145 | return work.With(ctx, in.Identity, func() error { |
| 146 | fresh, err := instancefs.OpenDirBeneath(env.Dir, o.Host) |
| 147 | if err != nil { |
| 148 | return err |
| 149 | } |
| 150 | defer fresh.Close() |
| 151 | after, err := fresh.Stat() |
| 152 | if err != nil { |
| 153 | return err |
| 154 | } |
| 155 | if !os.SameFile(before, after) { |
| 156 | return hostbox.ErrChanged |
| 157 | } |
| 158 | return nil |
| 159 | }) |
| 160 | } |
| 161 | |
| 162 | type filesSeedCheckingStore struct { |
| 163 | release.Store |
| 164 | data lease.VersionedStore |
| 165 | bucket, prefix string |
| 166 | } |
| 167 | |
| 168 | // A successful create needs no readback. On conflict, pin the current object |
| 169 | // version and compare bounded bytes before the publisher may reference it. |
| 170 | func (s filesSeedCheckingStore) Put(ctx context.Context, key string, body []byte, etag string) (string, error) { |
| 171 | result, err := s.Store.Put(ctx, key, body, etag) |
| 172 | if !errors.Is(err, release.ErrCASConflict) || etag != "" || !strings.HasPrefix(key, s.prefix+"objects/") { |
| 173 | return result, err |
| 174 | } |
| 175 | versions, e := s.data.ListVersions(ctx, s.bucket, key) |
| 176 | if e != nil { |
| 177 | return "", e |
| 178 | } |
| 179 | version := "" |
| 180 | for _, v := range versions { |
| 181 | if v.Key == key && v.IsLatest { |
| 182 | if version != "" || v.DeleteMarker || v.VersionID == "" || v.VersionID == "null" { |
| 183 | return "", hostfiles.ErrSuperseded |
| 184 | } |
| 185 | version = v.VersionID |
| 186 | } |
| 187 | } |
| 188 | if version == "" { |
| 189 | return "", hostfiles.ErrSuperseded |
| 190 | } |
| 191 | reader, e := s.data.OpenVersion(ctx, s.bucket, key, version) |
| 192 | if e != nil { |
| 193 | return "", e |
| 194 | } |
| 195 | actual, e := io.ReadAll(io.LimitReader(reader, int64(len(body))+1)) |
| 196 | e = errors.Join(e, reader.Close()) |
| 197 | if e != nil { |
| 198 | return "", e |
| 199 | } |
| 200 | if !bytes.Equal(actual, body) { |
| 201 | return "", hostfiles.ErrSuperseded |
| 202 | } |
| 203 | return result, err |
| 204 | } |
| 205 | |
amadan