/usr/share/gocode/src/github.com/influxdata/influxdb/cmd/influx_tsm/b1/reader.go is in golang-github-influxdb-influxdb-dev 1.0.2+dfsg1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | package b1 // import "github.com/influxdata/influxdb/cmd/influx_tsm/b1"
import (
"encoding/binary"
"math"
"sort"
"time"
"github.com/boltdb/bolt"
"github.com/influxdata/influxdb/cmd/influx_tsm/stats"
"github.com/influxdata/influxdb/cmd/influx_tsm/tsdb"
"github.com/influxdata/influxdb/tsdb/engine/tsm1"
)
const DefaultChunkSize int = 1000
var excludedBuckets = map[string]bool{
"fields": true,
"meta": true,
"series": true,
"wal": true,
}
// Reader is used to read all data from a b1 shard.
type Reader struct {
path string
db *bolt.DB
tx *bolt.Tx
cursors []*cursor
currCursor int
keyBuf string
values []tsm1.Value
valuePos int
fields map[string]*tsdb.MeasurementFields
codecs map[string]*tsdb.FieldCodec
stats *stats.Stats
}
// NewReader returns a reader for the b1 shard at path.
func NewReader(path string, stats *stats.Stats, chunkSize int) *Reader {
r := &Reader{
path: path,
fields: make(map[string]*tsdb.MeasurementFields),
codecs: make(map[string]*tsdb.FieldCodec),
stats: stats,
}
if chunkSize <= 0 {
chunkSize = DefaultChunkSize
}
r.values = make([]tsm1.Value, chunkSize)
return r
}
// Open opens the reader.
func (r *Reader) Open() error {
// Open underlying storage.
db, err := bolt.Open(r.path, 0666, &bolt.Options{Timeout: 1 * time.Second})
if err != nil {
return err
}
r.db = db
// Load fields.
if err := r.db.View(func(tx *bolt.Tx) error {
meta := tx.Bucket([]byte("fields"))
c := meta.Cursor()
for k, v := c.First(); k != nil; k, v = c.Next() {
mf := &tsdb.MeasurementFields{}
if err := mf.UnmarshalBinary(v); err != nil {
return err
}
r.fields[string(k)] = mf
r.codecs[string(k)] = tsdb.NewFieldCodec(mf.Fields)
}
return nil
}); err != nil {
return err
}
seriesSet := make(map[string]bool)
// ignore series index and find all series in this shard
if err := r.db.View(func(tx *bolt.Tx) error {
tx.ForEach(func(name []byte, _ *bolt.Bucket) error {
key := string(name)
if !excludedBuckets[key] {
seriesSet[key] = true
}
return nil
})
return nil
}); err != nil {
return err
}
r.tx, err = r.db.Begin(false)
if err != nil {
return err
}
// Create cursor for each field of each series.
for s := range seriesSet {
measurement := tsdb.MeasurementFromSeriesKey(s)
fields := r.fields[measurement]
if fields == nil {
r.stats.IncrFiltered()
continue
}
for _, f := range fields.Fields {
c := newCursor(r.tx, s, f.Name, r.codecs[measurement])
c.SeekTo(0)
r.cursors = append(r.cursors, c)
}
}
sort.Sort(cursors(r.cursors))
return nil
}
// Next returns whether any data remains to be read. It must be called before
// the next call to Read().
func (r *Reader) Next() bool {
r.valuePos = 0
OUTER:
for {
if r.currCursor >= len(r.cursors) {
// All cursors drained. No more data remains.
return false
}
cc := r.cursors[r.currCursor]
r.keyBuf = tsm1.SeriesFieldKey(cc.series, cc.field)
for {
k, v := cc.Next()
if k == -1 {
// Go to next cursor and try again.
r.currCursor++
if r.valuePos == 0 {
// The previous cursor had no data. Instead of returning
// just go immediately to the next cursor.
continue OUTER
}
// There is some data available. Indicate that it should be read.
return true
}
if f, ok := v.(float64); ok {
if math.IsInf(f, 0) {
r.stats.AddPointsRead(1)
r.stats.IncrInf()
continue
}
if math.IsNaN(f) {
r.stats.AddPointsRead(1)
r.stats.IncrNaN()
continue
}
}
r.values[r.valuePos] = tsm1.NewValue(k, v)
r.valuePos++
if r.valuePos >= len(r.values) {
return true
}
}
}
}
// Read returns the next chunk of data in the shard, converted to tsm1 values. Data is
// emitted completely for every field, in every series, before the next field is processed.
// Data from Read() adheres to the requirements for writing to tsm1 shards
func (r *Reader) Read() (string, []tsm1.Value, error) {
return r.keyBuf, r.values[:r.valuePos], nil
}
// Close closes the reader.
func (r *Reader) Close() error {
r.tx.Rollback()
return r.db.Close()
}
// cursor provides ordered iteration across a series.
type cursor struct {
// Bolt cursor and readahead buffer.
cursor *bolt.Cursor
keyBuf int64
valBuf interface{}
series string
field string
dec *tsdb.FieldCodec
}
// Cursor returns an iterator for a key over a single field.
func newCursor(tx *bolt.Tx, series string, field string, dec *tsdb.FieldCodec) *cursor {
cur := &cursor{
keyBuf: -2,
series: series,
field: field,
dec: dec,
}
// Retrieve series bucket.
b := tx.Bucket([]byte(series))
if b != nil {
cur.cursor = b.Cursor()
}
return cur
}
// Seek moves the cursor to a position.
func (c *cursor) SeekTo(seek int64) {
var seekBytes [8]byte
binary.BigEndian.PutUint64(seekBytes[:], uint64(seek))
k, v := c.cursor.Seek(seekBytes[:])
c.keyBuf, c.valBuf = tsdb.DecodeKeyValue(c.field, c.dec, k, v)
}
// Next returns the next key/value pair from the cursor.
func (c *cursor) Next() (key int64, value interface{}) {
for {
k, v := func() (int64, interface{}) {
if c.keyBuf != -2 {
k, v := c.keyBuf, c.valBuf
c.keyBuf = -2
return k, v
}
k, v := c.cursor.Next()
if k == nil {
return -1, nil
}
return tsdb.DecodeKeyValue(c.field, c.dec, k, v)
}()
if k != -1 && v == nil {
// There is a point in the series at the next timestamp,
// but not for this cursor's field. Go to the next point.
continue
}
return k, v
}
}
// Sort b1 cursors in correct order for writing to TSM files.
type cursors []*cursor
func (a cursors) Len() int { return len(a) }
func (a cursors) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a cursors) Less(i, j int) bool {
if a[i].series == a[j].series {
return a[i].field < a[j].field
}
return a[i].series < a[j].series
}
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