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query-common.go
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query-common.go
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package main
import (
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/timestreamquery"
"fmt"
"os"
)
func fail(s string) {
panic(s)
}
func check(e error) {
if e != nil {
panic(e)
}
}
func write(f *os.File, s string) {
if f != nil {
_, err := f.WriteString(s + "\n")
check(err)
f.Sync()
}
}
func processScalarType(datum *timestreamquery.Datum) string {
if datum.NullValue != nil && *datum.NullValue {
return "NULL"
}
return *datum.ScalarValue
}
func processTimeSeriesType(data []*timestreamquery.TimeSeriesDataPoint, columnInfo *timestreamquery.ColumnInfo) string {
value := ""
for k := 0; k < len(data); k++ {
time := data[k].Time
value += *time + ":"
if columnInfo.Type.ScalarType != nil {
value += processScalarType(data[k].Value)
} else if columnInfo.Type.ArrayColumnInfo != nil {
value += processArrayType(data[k].Value.ArrayValue, columnInfo.Type.ArrayColumnInfo)
} else if columnInfo.Type.RowColumnInfo != nil {
value += processRowType(data[k].Value.RowValue.Data, columnInfo.Type.RowColumnInfo)
} else {
fail("Bad data type")
}
if k != len(data)-1 {
value += ", "
}
}
return value
}
func processArrayType(datumList []*timestreamquery.Datum, columnInfo *timestreamquery.ColumnInfo) string {
value := ""
for k := 0; k < len(datumList); k++ {
if columnInfo.Type.ScalarType != nil {
value += processScalarType(datumList[k])
} else if columnInfo.Type.TimeSeriesMeasureValueColumnInfo != nil {
value += processTimeSeriesType(datumList[k].TimeSeriesValue, columnInfo.Type.TimeSeriesMeasureValueColumnInfo)
} else if columnInfo.Type.ArrayColumnInfo != nil {
value += "["
value += processArrayType(datumList[k].ArrayValue, columnInfo.Type.ArrayColumnInfo)
value += "]"
} else if columnInfo.Type.RowColumnInfo != nil {
value += "["
value += processRowType(datumList[k].RowValue.Data, columnInfo.Type.RowColumnInfo)
value += "]"
} else {
fail("Bad column type")
}
if k != len(datumList)-1 {
value += ", "
}
}
return value
}
func processRowType(data []*timestreamquery.Datum, metadata []*timestreamquery.ColumnInfo) string {
value := ""
for j := 0; j < len(data); j++ {
if metadata[j].Type.ScalarType != nil {
// process simple data types
value += processScalarType(data[j])
} else if metadata[j].Type.TimeSeriesMeasureValueColumnInfo != nil {
// fmt.Println("Timeseries measure value column info")
// fmt.Println(metadata[j].Type.TimeSeriesMeasureValueColumnInfo.Type)
datapointList := data[j].TimeSeriesValue
value += "["
value += processTimeSeriesType(datapointList, metadata[j].Type.TimeSeriesMeasureValueColumnInfo)
value += "]"
} else if metadata[j].Type.ArrayColumnInfo != nil {
columnInfo := metadata[j].Type.ArrayColumnInfo
// fmt.Println("Array column info")
// fmt.Println(columnInfo)
datumList := data[j].ArrayValue
value += "["
value += processArrayType(datumList, columnInfo)
value += "]"
} else if metadata[j].Type.RowColumnInfo != nil {
columnInfo := metadata[j].Type.RowColumnInfo
datumList := data[j].RowValue.Data
value += "["
value += processRowType(datumList, columnInfo)
value += "]"
} else {
panic("Bad column type")
}
// comma seperated column values
if j != len(data)-1 {
value += ", "
}
}
return value
}
func runQuery(queryPtr *string, querySvc *timestreamquery.TimestreamQuery, f *os.File) {
queryInput := ×treamquery.QueryInput{
QueryString: aws.String(*queryPtr),
}
fmt.Println("QueryInput:")
fmt.Println(queryInput)
// execute the query
err := querySvc.QueryPages(queryInput,
func(page *timestreamquery.QueryOutput, lastPage bool) bool {
// process query response
queryStatus := page.QueryStatus
fmt.Println("Current query status:")
fmt.Println(queryStatus)
// query response metadata
// includes column names and types
metadata := page.ColumnInfo
fmt.Println("Metadata:")
fmt.Println(metadata)
header := ""
for i := 0; i < len(metadata); i++ {
header += *metadata[i].Name
if i != len(metadata)-1 {
header += ", "
}
}
write(f, header)
// query response data
fmt.Println("Data:")
// process rows
rows := page.Rows
for i := 0; i < len(rows); i++ {
data := rows[i].Data
value := processRowType(data, metadata)
fmt.Println(value)
write(f, value)
}
fmt.Println("Number of rows:", len(page.Rows))
return true
})
if err != nil {
fmt.Println("Error:")
fmt.Println(err)
}
}