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generator_data.go
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/
generator_data.go
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package inputs
import (
"bufio"
"fmt"
"io"
"math/rand"
"os"
"sort"
"github.com/timescale/tsbs/pkg/data"
"github.com/timescale/tsbs/pkg/data/serialize"
"github.com/timescale/tsbs/pkg/data/usecases"
"github.com/timescale/tsbs/pkg/data/usecases/common"
"github.com/timescale/tsbs/pkg/targets"
"github.com/timescale/tsbs/pkg/targets/constants"
)
// Error messages when using a DataGenerator
const (
ErrNoConfig = "no GeneratorConfig provided"
ErrInvalidDataConfig = "invalid config: DataGenerator needs a DataGeneratorConfig"
)
// DataGenerator is a type of Generator for creating data that will be consumed
// by a database's write/insert operations. The output is specific to the type
// of database, but is consumed by TSBS loaders like tsbs_load_timescaledb.
type DataGenerator struct {
// Out is the writer where data should be written. If nil, it will be
// os.Stdout unless File is specified in the GeneratorConfig passed to
// Generate.
Out io.Writer
config *common.DataGeneratorConfig
// bufOut represents the buffered writer that should actually be passed to
// any operations that write out data.
bufOut *bufio.Writer
}
func (g *DataGenerator) init(config common.GeneratorConfig) error {
if config == nil {
return fmt.Errorf(ErrNoConfig)
}
switch config.(type) {
case *common.DataGeneratorConfig:
default:
return fmt.Errorf(ErrInvalidDataConfig)
}
g.config = config.(*common.DataGeneratorConfig)
err := g.config.Validate()
if err != nil {
return err
}
if g.Out == nil {
g.Out = os.Stdout
}
g.bufOut, err = getBufferedWriter(g.config.File, g.Out)
if err != nil {
return err
}
return nil
}
func (g *DataGenerator) Generate(config common.GeneratorConfig, target targets.ImplementedTarget) error {
err := g.init(config)
if err != nil {
return err
}
rand.Seed(g.config.Seed)
scfg, err := usecases.GetSimulatorConfig(g.config)
if err != nil {
return err
}
sim := scfg.NewSimulator(g.config.LogInterval, g.config.Limit)
serializer, err := g.getSerializer(sim, target)
if err != nil {
return err
}
return g.runSimulator(sim, serializer, g.config)
}
func (g *DataGenerator) CreateSimulator(config *common.DataGeneratorConfig) (common.Simulator, error) {
err := g.init(config)
if err != nil {
return nil, err
}
rand.Seed(g.config.Seed)
scfg, err := usecases.GetSimulatorConfig(g.config)
if err != nil {
return nil, err
}
return scfg.NewSimulator(g.config.LogInterval, g.config.Limit), nil
}
func (g *DataGenerator) runSimulator(sim common.Simulator, serializer serialize.PointSerializer, dgc *common.DataGeneratorConfig) error {
defer g.bufOut.Flush()
currGroupID := uint(0)
point := data.NewPoint()
for !sim.Finished() {
write := sim.Next(point)
if !write {
point.Reset()
continue
}
// in the default case this is always true
if currGroupID == dgc.InterleavedGroupID {
err := serializer.Serialize(point, g.bufOut)
if err != nil {
return fmt.Errorf("can not serialize point: %s", err)
}
}
point.Reset()
currGroupID = (currGroupID + 1) % dgc.InterleavedNumGroups
}
return nil
}
func (g *DataGenerator) getSerializer(sim common.Simulator, target targets.ImplementedTarget) (serialize.PointSerializer, error) {
switch target.TargetName() {
case constants.FormatCrateDB:
fallthrough
case constants.FormatClickhouse:
fallthrough
case constants.FormatTimescaleDB:
g.writeHeader(sim.Headers())
}
return target.Serializer(), nil
}
//TODO should be implemented in targets package
func (g *DataGenerator) writeHeader(headers *common.GeneratedDataHeaders) {
g.bufOut.WriteString("tags")
types := headers.TagTypes
for i, key := range headers.TagKeys {
g.bufOut.WriteString(",")
g.bufOut.Write([]byte(key))
g.bufOut.WriteString(" ")
g.bufOut.WriteString(types[i])
}
g.bufOut.WriteString("\n")
// sort the keys so the header is deterministic
keys := make([]string, 0)
fields := headers.FieldKeys
for k := range fields {
keys = append(keys, k)
}
sort.Strings(keys)
for _, measurementName := range keys {
g.bufOut.WriteString(measurementName)
for _, field := range fields[measurementName] {
g.bufOut.WriteString(",")
g.bufOut.Write([]byte(field))
}
g.bufOut.WriteString("\n")
}
g.bufOut.WriteString("\n")
}