/
insert.go
299 lines (255 loc) · 6.44 KB
/
insert.go
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package clickhouse
import (
"bufio"
"context"
"fmt"
"io"
"math/big"
"strconv"
"strings"
"github.com/rs/zerolog/log"
"github.com/shopspring/decimal"
"github.com/tidwall/gjson"
)
func (s *ClickhouseServer) inferColumnTypes(file io.ReadSeeker) (map[string]string, error) {
rc := map[string]string{}
typeCounts := map[string]map[string]int{}
_, err := file.Seek(0, io.SeekStart)
if err != nil {
return rc, err
}
scanner := bufio.NewScanner(file)
maxCapacity := 100_000_000
buf := make([]byte, maxCapacity)
scanner.Buffer(buf, maxCapacity)
for scanner.Scan() {
parsed := gjson.ParseBytes(scanner.Bytes())
parsed.ForEach(func(key, value gjson.Result) bool {
k := key.String()
_, ok := typeCounts[k]
if !ok {
typeCounts[k] = map[string]int{}
}
switch value.Type {
case gjson.String:
typeCounts[k]["string"] += 1
case gjson.Null:
typeCounts[k]["null"] += 1
case gjson.False:
typeCounts[k]["bool"] += 1
case gjson.True:
typeCounts[k]["bool"] += 1
case gjson.Number:
_, intErr := strconv.Atoi(value.Raw)
if intErr != nil {
typeCounts[k]["float"] += 1
} else {
typeCounts[k]["int"] += 1
}
default:
typeCounts[k]["undefined"] += 1
}
return true
})
}
log.Trace().Interface("column_type_counts", typeCounts).Send()
if err := scanner.Err(); err != nil {
return rc, err
}
for colName, colTypeCounts := range typeCounts {
if colTypeCounts["string"] > 0 {
rc[colName] = "string"
continue
} else if colTypeCounts["undefined"] > 0 {
rc[colName] = "string"
continue
} else if colTypeCounts["float"] > 0 {
rc[colName] = "float"
continue
} else if colTypeCounts["int"] > 0 {
rc[colName] = "int"
continue
} else if colTypeCounts["bool"] > 0 {
rc[colName] = "bool"
} else {
rc[colName] = "string"
}
}
log.Trace().Interface("column_types", rc).Send()
return rc, nil
}
func (s *ClickhouseServer) createColumnsWithTypes(table string, columns map[string]string) error {
sql := fmt.Sprintf(`ALTER TABLE "%s"."%s" `, s.Database, table)
columnSql := []string{}
for colName, jsonType := range columns {
var colType string
switch jsonType {
case "int":
colType = "Int64"
case "bool":
colType = "Boolean"
case "float":
colType = "Float64"
case "string":
colType = "String"
default:
colType = "String"
}
columnSql = append(columnSql, fmt.Sprintf(`ADD COLUMN IF NOT EXISTS "%s" %s`, colName, colType))
}
sql += strings.Join(columnSql, ", ")
log.Trace().Msg(sql)
return s.conn.Exec(context.TODO(), sql)
}
func (s *ClickhouseServer) getClickhouseTypes(table string) (map[string]string, error) {
rc := map[string]string{}
sql := fmt.Sprintf("DESCRIBE TABLE \"%s\" FORMAT JSON", table)
resp, err := s.httpQuery(sql)
defer resp.Close()
if err != nil {
return rc, err
}
data, err := io.ReadAll(resp)
if err != nil {
return rc, err
}
parsed := gjson.ParseBytes(data)
for _, field := range parsed.Get("data").Array() {
rc[field.Get("name").String()] = field.Get("type").String()
}
log.Trace().Interface("clickhouse_column_types", rc).Str("table", table).Send()
return rc, nil
}
func (s *ClickhouseServer) jsonToGoType(clickhouseType string, data gjson.Result) any {
switch clickhouseType {
case "String", "FixedString":
return data.String()
case "Decimal":
return decimal.NewFromFloat(data.Float())
case "Bool":
return data.Bool()
case "UInt8":
return uint8(data.Uint())
case "UInt16":
return uint16(data.Uint())
case "UInt32":
return uint32(data.Uint())
case "UInt64":
return data.Uint()
case "UInt128", "UInt256":
n := new(big.Int)
n.SetString(data.String(), 10)
return n
case "Int8":
return int8(data.Int())
case "Int16":
return int16(data.Int())
case "Int32":
return int32(data.Int())
case "Int64":
return data.Int()
case "Int128", "Int256":
n := new(big.Int)
n.SetString(data.String(), 10)
return n
case "Float32":
return float32(data.Float())
case "Float64":
return data.Float()
case "UUID":
return data.String()
case "Date", "Date32":
return data.String()
case "DateTime", "DateTime64":
if data.Type == gjson.Number {
return data.Int()
} else {
return data.String()
}
case "Enum8":
return int8(data.Int())
case "Enum16":
return int16(data.Int())
}
return data.String()
}
func (s *ClickhouseServer) insertData(file io.ReadSeeker, table string, columns map[string]string) error {
// Get list of columns so we use the same order
colNames := make([]string, len(columns))
i := 0
for k := range columns {
colNames[i] = k
i++
}
// Get types for clickhouse columns
clickhouseColumnTypes, err := s.getClickhouseTypes(table)
if err != nil {
return err
}
// Create INSERT statement
insertSql := fmt.Sprintf(`INSERT INTO "%s"."%s" (`, s.Database, table)
for i, colName := range colNames {
insertSql += fmt.Sprintf("`%s`", colName)
if i < len(columns)-1 {
insertSql += ","
}
}
insertSql += ")"
// log.Trace().Str("key", localFile).Msg(insertSql)
// Open .ndjson file for reading
_, err = file.Seek(0, io.SeekStart)
// file, err := os.Open(localFile)
if err != nil {
return err
}
// defer file.Close()
// Begin batch
batch, err := s.conn.PrepareBatch(context.Background(), insertSql)
if err != nil {
log.Err(err).Msg("unable to initiate batch query")
return err
}
scanner := bufio.NewScanner(file)
maxCapacity := 100_000_000
buf := make([]byte, maxCapacity)
scanner.Buffer(buf, maxCapacity)
// Iterate over each JSON object
row := 0
for scanner.Scan() {
data := scanner.Bytes()
vals := make([]any, len(colNames))
for i, colName := range colNames {
colType := clickhouseColumnTypes[colName]
vals[i] = s.jsonToGoType(colType, gjson.GetBytes(data, colName))
}
err = batch.Append(vals...)
if err != nil {
log.Error().Err(err).Int("row", row).Msg("Unable to add item to batch")
}
row++
}
if err := scanner.Err(); err != nil {
log.Err(err).Msg("scanner error")
batch.Abort()
return err
}
return batch.Send()
}
func (s *ClickhouseServer) InsertBatchFromNDJson(table string, input io.ReadSeeker) error {
columns, err := s.inferColumnTypes(input)
if err != nil {
log.Err(err).Msg("failed to retrieve columns from input JSON")
return err
}
err = s.createColumnsWithTypes(table, columns)
if err != nil {
log.Err(err).Msg("failed to create columns")
return err
}
err = s.insertData(input, table, columns)
if err != nil {
log.Err(err).Msg("Failed to insert data")
return err
}
return nil
}