forked from monzo/gocassa
/
flakeseries_table.go
163 lines (137 loc) · 4.28 KB
/
flakeseries_table.go
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package gocassa
import (
"errors"
"fmt"
"strings"
"time"
"github.com/mattheath/base62"
"github.com/mattheath/kala/bigflake"
"github.com/mattheath/kala/util"
)
// we have to put the timestamp from the flake ID into a field so that we can
// execute queries with it
const flakeTimestampFieldName = "flake_created"
type flakeSeriesT struct {
t Table
idField string
bucketSize time.Duration
}
func (o *flakeSeriesT) Table() Table { return o.t }
func (o *flakeSeriesT) Create() error { return o.Table().Create() }
func (o *flakeSeriesT) CreateIfNotExist() error { return o.Table().CreateIfNotExist() }
func (o *flakeSeriesT) Name() string { return o.Table().Name() }
func (o *flakeSeriesT) Recreate() error { return o.Table().Recreate() }
func (o *flakeSeriesT) CreateStatement() (Statement, error) { return o.Table().CreateStatement() }
func (o *flakeSeriesT) CreateIfNotExistStatement() (Statement, error) {
return o.Table().CreateIfNotExistStatement()
}
func (o *flakeSeriesT) Set(v interface{}) Op {
m, ok := toMap(v)
if !ok {
panic("Can't set: not able to convert")
}
id, ok := m[o.idField].(string)
if !ok {
panic(fmt.Sprintf("Id field (%s) is not present or is not a string", o.idField))
}
timestamp, err := flakeToTime(id)
if err != nil {
return errOp{err: err}
}
m[flakeTimestampFieldName] = timestamp
m[bucketFieldName] = bucket(timestamp, o.bucketSize)
return o.Table().Set(m)
}
func (o *flakeSeriesT) Update(id string, m map[string]interface{}) Op {
timestamp, err := flakeToTime(id)
if err != nil {
return errOp{err: err}
}
bucket := bucket(timestamp, o.bucketSize)
return o.Table().
Where(Eq(bucketFieldName, bucket),
Eq(flakeTimestampFieldName, timestamp),
Eq(o.idField, id)).
Update(m)
}
func (o *flakeSeriesT) Delete(id string) Op {
timestamp, err := flakeToTime(id)
if err != nil {
return errOp{err: err}
}
bucket := bucket(timestamp, o.bucketSize)
return o.Table().
Where(Eq(bucketFieldName, bucket),
Eq(flakeTimestampFieldName, timestamp),
Eq(o.idField, id)).
Delete()
}
func (o *flakeSeriesT) Read(id string, pointer interface{}) Op {
timestamp, err := flakeToTime(id)
if err != nil {
return errOp{err: err}
}
bucket := bucket(timestamp, o.bucketSize)
return o.Table().
Where(Eq(bucketFieldName, bucket),
Eq(flakeTimestampFieldName, timestamp),
Eq(o.idField, id)).
ReadOne(pointer)
}
func (o *flakeSeriesT) List(startTime, endTime time.Time, pointerToASlice interface{}) Op {
buckets := []interface{}{}
for bucket := o.Buckets(startTime); bucket.Bucket().Before(endTime); bucket = bucket.Next() {
buckets = append(buckets, bucket.Bucket())
}
return o.Table().
Where(In(bucketFieldName, buckets...),
GTE(flakeTimestampFieldName, startTime),
LT(flakeTimestampFieldName, endTime)).
Read(pointerToASlice)
}
func (o *flakeSeriesT) Buckets(start time.Time) Buckets {
return bucketIter{
v: start,
step: o.bucketSize,
field: bucketFieldName,
invariant: o.Table().Where()}
}
func (o *flakeSeriesT) ListSince(id string, window time.Duration, pointerToASlice interface{}) Op {
startTime, err := flakeToTime(id)
if err != nil {
return errOp{err: err}
}
var endTime time.Time
if window == 0 {
// no window set - so go up until 5 mins in the future
endTime = time.Now().Add(5 * time.Minute)
} else {
endTime = startTime.Add(window)
}
buckets := []interface{}{}
for bucket := o.Buckets(startTime); bucket.Bucket().Before(endTime); bucket = bucket.Next() {
buckets = append(buckets, bucket.Bucket())
}
return o.Table().
Where(In(bucketFieldName, buckets),
GTE(flakeTimestampFieldName, startTime),
LT(flakeTimestampFieldName, endTime),
GT(o.idField, id)).
Read(pointerToASlice)
}
func (o *flakeSeriesT) WithOptions(opt Options) FlakeSeriesTable {
return &flakeSeriesT{
t: o.Table().WithOptions(opt),
idField: o.idField,
bucketSize: o.bucketSize}
}
func flakeToTime(id string) (time.Time, error) {
parts := strings.Split(id, "_")
if len(parts) < 2 {
return time.Time{}, errors.New("Invalid flake id")
}
intId := base62.DecodeToBigInt(parts[len(parts)-1])
msTime, _, _ := bigflake.ParseId(intId)
timestamp := util.MsInt64ToTime(msTime)
return timestamp, nil
}