| 1 | package hostops |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "errors" |
| 6 | "os" |
| 7 | "slices" |
| 8 | |
| 9 | "github.com/carlosframework/platform/internal/hostclaim" |
| 10 | ) |
| 11 | |
| 12 | func (c Controller) CensusPurge(ctx context.Context, account, app, id, appID string) error { |
| 13 | j, tag, err := ReadPurgeJournal(ctx, c.Store, account, app, id, appID) |
| 14 | if err != nil { |
| 15 | return err |
| 16 | } |
| 17 | if j.Phase != "reserved" { |
| 18 | return ErrPending |
| 19 | } |
| 20 | records, err := Records(ctx, c.Store, account, app) |
| 21 | if err != nil { |
| 22 | return err |
| 23 | } |
| 24 | for _, r := range records { |
| 25 | obs, readErr := hostclaim.Read(ctx, c.Store, r.Holder.Host) |
| 26 | if readErr != nil { |
| 27 | return readErr |
| 28 | } |
| 29 | if obs.Absent { |
| 30 | return ErrPending |
| 31 | } |
| 32 | if !matches(r, obs.Claim.Holder) { |
| 33 | return ErrIdentity |
| 34 | } |
| 35 | } |
| 36 | hosts, err := ListClaims(ctx, c.Store) |
| 37 | if err != nil { |
| 38 | return err |
| 39 | } |
| 40 | for _, host := range hosts { |
| 41 | obs, err := hostclaim.Read(ctx, c.Store, host) |
| 42 | if err != nil { |
| 43 | return err |
| 44 | } |
| 45 | if obs.Absent || obs.Claim.Holder == nil { |
| 46 | continue |
| 47 | } |
| 48 | h := obs.Claim.Holder |
| 49 | if h.Account != account || h.App != app { |
| 50 | continue |
| 51 | } |
| 52 | if obs.Claim.Op.Kind != hostclaim.KindServing || !obs.Claim.Touched.Complete { |
| 53 | return ErrPending |
| 54 | } |
| 55 | if _, _, err = c.Authority.Inventory(ctx, obs); err != nil { |
| 56 | return err |
| 57 | } |
| 58 | r, err := ReadRecord(ctx, c.Store, h.Key) |
| 59 | if err != nil { |
| 60 | return err |
| 61 | } |
| 62 | if !matches(r, h) { |
| 63 | return ErrIdentity |
| 64 | } |
| 65 | progress := j.Hosts[host] |
| 66 | holder := *h |
| 67 | progress.Holder = &holder |
| 68 | progress.RecordETag = r.ETag |
| 69 | progress.ClaimETag = obs.ETag |
| 70 | progress.ClaimGen = obs.Claim.Gen |
| 71 | j.Hosts[host] = progress |
| 72 | } |
| 73 | j.Phase = "adopted" |
| 74 | _, err = c.Control.SavePurgeJournal(ctx, j, tag) |
| 75 | return err |
| 76 | } |
| 77 | func (c Controller) ClaimPurgeHosts(ctx context.Context, account, app, id, appID string) error { |
| 78 | j, _, err := ReadPurgeJournal(ctx, c.Store, account, app, id, appID) |
| 79 | if err != nil { |
| 80 | return err |
| 81 | } |
| 82 | if j.Phase != "adopted" { |
| 83 | return ErrPending |
| 84 | } |
| 85 | for host, p := range j.Hosts { |
| 86 | if p.Holder == nil { |
| 87 | continue |
| 88 | } |
| 89 | obs, err := hostclaim.Read(ctx, c.Store, host) |
| 90 | if err != nil { |
| 91 | return err |
| 92 | } |
| 93 | if obs.Absent || obs.Claim.Holder == nil || obs.Claim.Holder.Incarnation != p.Holder.Incarnation { |
| 94 | return ErrIdentity |
| 95 | } |
| 96 | if obs.Claim.Op.Kind == hostclaim.KindPurging && obs.Claim.Op.ID == id { |
| 97 | continue |
| 98 | } |
| 99 | if obs.ETag != p.ClaimETag || obs.Claim.Gen != p.ClaimGen { |
| 100 | // A canceled unused hold invalidates its old observation. Re-save |
| 101 | // only while this purge still owns the adopted phase and holder. |
| 102 | fresh, tag, e := ReadPurgeJournal(ctx, c.Store, account, app, id, appID) |
| 103 | if e != nil { |
| 104 | return e |
| 105 | } |
| 106 | if fresh.Phase != "adopted" || obs.Claim.Op.Kind != hostclaim.KindServing || obs.Claim.Holder.Stamp != p.Holder.Stamp { |
| 107 | return ErrPending |
| 108 | } |
| 109 | saved := fresh.Hosts[host] |
| 110 | saved.ClaimETag = obs.ETag |
| 111 | saved.ClaimGen = obs.Claim.Gen |
| 112 | fresh.Hosts[host] = saved |
| 113 | _, e = c.Control.SavePurgeJournal(ctx, fresh, tag) |
| 114 | return e |
| 115 | } |
| 116 | authority, ok := c.Authority.(*ProductionAuthority) |
| 117 | if !ok { |
| 118 | return ErrContract |
| 119 | } |
| 120 | _, err = authority.StartPurgeClaim(ctx, obs, account, app, appID, id, j.RequestedBy) |
| 121 | if err != nil { |
| 122 | return err |
| 123 | } |
| 124 | } |
| 125 | fresh, tag, err := ReadPurgeJournal(ctx, c.Store, account, app, id, appID) |
| 126 | if err != nil { |
| 127 | return err |
| 128 | } |
| 129 | if fresh.Phase != "adopted" { |
| 130 | return ErrPending |
| 131 | } |
| 132 | fresh.Phase = "claimed" |
| 133 | _, err = c.Control.SavePurgeJournal(ctx, fresh, tag) |
| 134 | return err |
| 135 | } |
| 136 | func (c Controller) PurgeBarrier(ctx context.Context, account, app, id, appID string) error { |
| 137 | j, _, err := ReadPurgeJournal(ctx, c.Store, account, app, id, appID) |
| 138 | if err != nil { |
| 139 | return err |
| 140 | } |
| 141 | if j.Phase != "claimed" { |
| 142 | return ErrPending |
| 143 | } |
| 144 | for host, p := range j.Hosts { |
| 145 | if p.Holder == nil { |
| 146 | continue |
| 147 | } |
| 148 | obs, err := hostclaim.Read(ctx, c.Store, host) |
| 149 | if err != nil { |
| 150 | return err |
| 151 | } |
| 152 | if obs.Absent || obs.Claim.Holder == nil || obs.Claim.Holder.Incarnation != p.Holder.Incarnation || obs.Claim.Op.Kind != hostclaim.KindPurging || obs.Claim.Op.ID != id { |
| 153 | return ErrPending |
| 154 | } |
| 155 | if err = c.Authority.FirstPhase(ctx, obs); err != nil { |
| 156 | return err |
| 157 | } |
| 158 | } |
| 159 | return nil |
| 160 | } |
| 161 | |
| 162 | // ToParking records history before its chores finish. The old holder must |
| 163 | // also be gone; FreeAfterPark is the only transition that removes it. |
| 164 | func purgeHostFreed(claim hostclaim.Claim, p PurgeHost) bool { |
| 165 | if p.Holder == nil || (claim.Holder != nil && claim.Holder.Incarnation == p.Holder.Incarnation) { |
| 166 | return false |
| 167 | } |
| 168 | return slices.Contains(claim.RetiredIncarnations, p.Holder.Incarnation) || |
| 169 | (p.FreeFromGen != 0 && claim.Gen > p.FreeFromGen) |
| 170 | } |
| 171 | func (c Controller) RetirePurgeHosts(ctx context.Context, account, app, id, appID string) error { |
| 172 | j, _, err := ReadPurgeJournal(ctx, c.Store, account, app, id, appID) |
| 173 | if err != nil { |
| 174 | return err |
| 175 | } |
| 176 | if j.Phase != "torn-down" { |
| 177 | return ErrPending |
| 178 | } |
| 179 | for host, p := range j.Hosts { |
| 180 | if p.Holder == nil || p.Retired { |
| 181 | continue |
| 182 | } |
| 183 | obs, err := hostclaim.Read(ctx, c.Store, host) |
| 184 | if err != nil { |
| 185 | return err |
| 186 | } |
| 187 | if obs.Absent { |
| 188 | return ErrPending |
| 189 | } |
| 190 | if purgeHostFreed(*obs.Claim, p) { |
| 191 | fresh, tag, err := ReadPurgeJournal(ctx, c.Store, account, app, id, appID) |
| 192 | if err != nil { |
| 193 | return err |
| 194 | } |
| 195 | saved := fresh.Hosts[host] |
| 196 | saved.Retired = true |
| 197 | fresh.Hosts[host] = saved |
| 198 | if _, err = c.Control.SavePurgeJournal(ctx, fresh, tag); err != nil { |
| 199 | return err |
| 200 | } |
| 201 | continue |
| 202 | } |
| 203 | if obs.Claim.Holder == nil || obs.Claim.Holder.Incarnation != p.Holder.Incarnation || obs.Claim.Op.ID != id { |
| 204 | return ErrPending |
| 205 | } |
| 206 | if obs.Claim.Op.Kind == hostclaim.KindParking { |
| 207 | if len(obs.Claim.Obligations) != 0 { |
| 208 | return ErrPending |
| 209 | } |
| 210 | fresh, tag, err := ReadPurgeJournal(ctx, c.Store, account, app, id, appID) |
| 211 | if err != nil { |
| 212 | return err |
| 213 | } |
| 214 | saved := fresh.Hosts[host] |
| 215 | saved.FreeFromGen = obs.Claim.Gen |
| 216 | fresh.Hosts[host] = saved |
| 217 | if _, err = c.Control.SavePurgeJournal(ctx, fresh, tag); err != nil { |
| 218 | return err |
| 219 | } |
| 220 | if err = c.Free(ctx, host, id); err != nil { |
| 221 | return err |
| 222 | } |
| 223 | return ErrPending |
| 224 | } |
| 225 | if obs.Claim.Op.Kind != hostclaim.KindPurging { |
| 226 | return ErrPending |
| 227 | } |
| 228 | if obs.Claim.Op.Intent["etag"] == "" { |
| 229 | r, err := ReadRecord(ctx, c.Store, p.Holder.Key) |
| 230 | if errors.Is(err, os.ErrNotExist) { |
| 231 | return ErrPending |
| 232 | } |
| 233 | if err != nil { |
| 234 | return err |
| 235 | } |
| 236 | if !matches(r, p.Holder) { |
| 237 | return ErrIdentity |
| 238 | } |
| 239 | // Save the exact observed record before the host intent, so a crash |
| 240 | // cannot make later replay rediscover an unrelated version. |
| 241 | fresh, tag, err := ReadPurgeJournal(ctx, c.Store, account, app, id, appID) |
| 242 | if err != nil { |
| 243 | return err |
| 244 | } |
| 245 | saved := fresh.Hosts[host] |
| 246 | saved.RecordETag = r.ETag |
| 247 | fresh.Hosts[host] = saved |
| 248 | if _, err = c.Control.SavePurgeJournal(ctx, fresh, tag); err != nil { |
| 249 | return err |
| 250 | } |
| 251 | if _, err = hostclaim.Update(ctx, c.Store, obs, PurgeRecordIntent(id, r.Holder.Key, r.ETag)); err != nil { |
| 252 | return err |
| 253 | } |
| 254 | } |
| 255 | if err = c.Retire(ctx, host, id); err != nil { |
| 256 | return err |
| 257 | } |
| 258 | return ErrPending |
| 259 | } |
| 260 | fresh, tag, err := ReadPurgeJournal(ctx, c.Store, account, app, id, appID) |
| 261 | if err != nil { |
| 262 | return err |
| 263 | } |
| 264 | for _, p := range fresh.Hosts { |
| 265 | if p.Holder != nil && !p.Retired { |
| 266 | return ErrPending |
| 267 | } |
| 268 | } |
| 269 | _ = tag |
| 270 | return nil |
| 271 | } |
| 272 | |
amadan