forked from stellar/go
/
system.go
345 lines (276 loc) · 7.41 KB
/
system.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
package ingest
import (
"github.com/stellar/go/services/horizon/internal/db2/core"
"github.com/stellar/go/services/horizon/internal/db2/history"
herr "github.com/stellar/go/services/horizon/internal/errors"
"github.com/stellar/go/services/horizon/internal/ledger"
"github.com/stellar/go/services/horizon/internal/log"
"github.com/stellar/go/services/horizon/internal/toid"
"github.com/stellar/go/support/errors"
)
// Backfill ingests history in reverse chronological order, from the current
// horizon elder query for `n` ledgers
func (i *System) Backfill(n uint) error {
start := ledger.CurrentState().HistoryElder
end := start - int32(n)
is := NewSession(i)
is.Cursor = NewCursor(start, end, i)
is.ClearExisting = true
is.Run()
log.WithField("start", start).
WithField("end", end).
WithField("err", is.Err).
WithField("ingested", is.Ingested).
Info("ingest: backfill complete")
return is.Err
}
// ClearAll removes all previously ingested historical data from the horizon
// database.
func (i *System) ClearAll() error {
hdb := i.HorizonDB.Clone()
ingestion := &Ingestion{DB: hdb}
err := ingestion.Start()
if err != nil {
return errors.Wrap(err, "failed to begin ingestion")
}
err = ingestion.ClearAll()
if err != nil {
return errors.Wrap(err, "failed to clear history tables")
}
err = ingestion.Close()
if err != nil {
return errors.Wrap(err, "failed to close ingestion")
}
log.Infof("cleared all history")
return nil
}
// RebaseHistory re-establishes horizon's history database using the provided
// sequence as a starting point.
func (i *System) RebaseHistory(sequence int32) error {
err := i.ClearAll()
if err != nil {
return errors.Wrap(err, "failed to clear db")
}
err = i.ReingestSingle(sequence)
if err != nil {
return errors.Wrap(err, "failed to reingest new base")
}
return nil
}
// ReingestAll re-ingests all ledgers
func (i *System) ReingestAll() (int, error) {
err := i.trimAbandondedLedgers()
if err != nil {
return 0, err
}
var coreElder int32
var coreLatest int32
cq := core.Q{Session: i.CoreDB}
err = cq.ElderLedger(&coreElder)
if err != nil {
return 0, errors.Wrap(err, "load core elder ledger failed")
}
err = cq.LatestLedger(&coreLatest)
if err != nil {
return 0, errors.Wrap(err, "load core elder ledger failed")
}
log.
WithField("start", coreElder).
WithField("end", coreLatest).
Info("reingest: all")
return i.ReingestRange(coreElder, coreLatest)
}
// ReingestOutdated finds old ledgers and reimports them.
func (i *System) ReingestOutdated() (n int, err error) {
q := history.Q{Session: i.HorizonDB}
err = i.trimAbandondedLedgers()
if err != nil {
return
}
// NOTE: this loop will never terminate if some bug were cause a ledger
// reingestion to silently fail.
for {
outdated := []int32{}
err = q.OldestOutdatedLedgers(&outdated, CurrentVersion)
if err != nil {
return
}
if len(outdated) == 0 {
return
}
log.
WithField("lowest_sequence", outdated[0]).
WithField("batch_size", len(outdated)).
Info("reingest: outdated")
var start, end int32
flush := func() error {
ingested, ferr := i.ReingestRange(start, end)
if ferr != nil {
return ferr
}
n += ingested
return nil
}
for idx := range outdated {
seq := outdated[idx]
if start == 0 {
start = seq
end = seq
continue
}
if seq == end+1 {
end = seq
continue
}
err = flush()
if err != nil {
return
}
start = seq
end = seq
}
err = flush()
if err != nil {
return
}
}
}
// ReingestRange reingests a range of ledgers, from `start` to `end`, inclusive.
func (i *System) ReingestRange(start, end int32) (int, error) {
is := NewSession(i)
is.Cursor = NewCursor(start, end, i)
is.ClearExisting = true
is.Run()
log.WithField("start", start).
WithField("end", end).
WithField("err", is.Err).
WithField("ingested", is.Ingested).
Info("ingest: range complete")
return is.Ingested, is.Err
}
// ReingestSingle re-ingests a single ledger
func (i *System) ReingestSingle(sequence int32) error {
_, err := i.ReingestRange(sequence, sequence)
return err
}
// Tick triggers the ingestion system to ingest any new ledger data, provided
// that there currently is not an import session in progress.
func (i *System) Tick() *Session {
i.lock.Lock()
if i.current != nil {
log.Info("ingest: already in progress")
i.lock.Unlock()
return nil
}
is := NewSession(i)
i.current = is
i.lock.Unlock()
i.runOnce()
return is
}
// run causes the importer to check stellar-core to see if we can import new
// data.
func (i *System) runOnce() {
defer func() {
if rec := recover(); rec != nil {
err := herr.FromPanic(rec)
log.Errorf("import session panicked: %s", err)
errors.ReportToSentry(err, nil)
}
}()
ls := ledger.CurrentState()
// 1. stash a copy of the current ingestion session (assigned from the tick)
// 2. decide what to import
// 3. import until none available
// 1.
i.lock.Lock()
is := i.current
i.lock.Unlock()
defer func() {
i.lock.Lock()
i.current = nil
i.lock.Unlock()
}()
if is == nil {
log.Warn("ingest: runOnce ran with a nil current session")
return
}
if ls.CoreLatest == 1 {
log.Warn("ingest: waiting for stellar-core sync")
return
}
if ls.HistoryLatest == ls.CoreLatest {
log.Debug("ingest: no new ledgers")
return
}
// 2.
if ls.HistoryLatest == 0 {
log.Infof(
"history db is empty, establishing base at ledger %d",
ls.CoreLatest,
)
is.Cursor = NewCursor(ls.CoreLatest, ls.CoreLatest, i)
} else {
is.Cursor = NewCursor(ls.HistoryLatest+1, ls.CoreLatest, i)
}
// 3.
is.Run()
if is.Err != nil {
log.Errorf("import session failed: %s", is.Err)
}
return
}
// trimAbandondedLedgers deletes all "abandonded" ledgers from the history
// database. An abandonded ledger, in this context, means a ledger known to
// horizon but is no longer present in the stellar-core database source. The
// usual cause for this situation is a stellar-core that uses the CATCHUP_RECENT
// mode.
func (i *System) trimAbandondedLedgers() error {
var coreElder int32
cq := core.Q{Session: i.CoreDB}
err := cq.ElderLedger(&coreElder)
if err != nil {
return errors.Wrap(err, "load core elder ledger failed")
}
hdb := i.HorizonDB.Clone()
ingestion := &Ingestion{DB: hdb}
err = ingestion.Start()
if err != nil {
return errors.Wrap(err, "failed to begin ingestion")
}
end := toid.New(coreElder, 0, 0)
err = ingestion.Clear(0, end.ToInt64())
if err != nil {
return errors.Wrap(err, "failed to clear ingestion")
}
err = ingestion.Close()
if err != nil {
return errors.Wrap(err, "failed to close ingestion")
}
log.
WithField("new_elder_ledger", coreElder).
Infof("reingest: abandonded ledgers trimmed")
return nil
}
// validateLedgerChain helps to ensure the chain of ledger entries is contiguous
// within horizon. It ensures the ledger at `seq` is a child of `seq - 1`.
func (i *System) validateLedgerChain(seq int32) error {
var (
cur core.LedgerHeader
prev history.Ledger
)
cq := &core.Q{Session: i.CoreDB}
hq := &history.Q{Session: i.HorizonDB}
err := cq.LedgerHeaderBySequence(&cur, seq)
if err != nil {
return errors.Wrap(err, "validateLedgerChain: failed to load cur ledger")
}
err = hq.LedgerBySequence(&prev, seq-1)
if err != nil {
return errors.Wrap(err, "validateLedgerChain: failed to load prev ledger")
}
if cur.PrevHash != prev.LedgerHash {
return errors.New("cur and prev ledger hashes don't match")
}
return nil
}