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package flamegraph
import (
"fmt"
"os"
"strings"
"github.com/DataDog/zstd"
)
// Collapsed represents a structure used to process and store information
// related to a collapsed flamegraph. It includes the following fields:
// - iorFile: The path to the input/output report file.
// - fields: A list of field names used in the flamegraph processing.
// - countField: The name of the field that represents the count or weight
// in the flamegraph data.
type Collapsed struct {
iorFile string // Path to the input/output report file.
fields []string // List of field names used in processing.
countField string // Field name representing the count or weight.
}
func NewCollapsed(iorFile string, fields []string, countField string) Collapsed {
return Collapsed{iorFile: iorFile, fields: fields, countField: countField}
}
func (c Collapsed) Write(iorDataFile string) (string, error) {
outFile := fmt.Sprintf("%s.%s-by-%s.collapsed.zst",
strings.TrimSuffix(iorDataFile, ".ior.zst"),
strings.Join(c.fields, ":"),
c.countField,
)
if _, err := os.Stat(outFile); err == nil {
fmt.Println(outFile, "already exists!")
return outFile, nil
}
// outFD should be zstd compressed
outFd, err := os.Create(outFile)
if err != nil {
return outFile, err
}
defer outFd.Close()
fmt.Println("Reading", iorDataFile)
iod, err := newIorDataFromFile(iorDataFile)
if err != nil {
return outFile, err
}
fmt.Println("Writing", outFile)
writer := zstd.NewWriter(outFd)
if err != nil {
return outFile, err
}
defer writer.Close()
for record := range iod.iter() {
var fieldValues []string
for _, fieldName := range c.fields {
v, err := record.StringByName(fieldName)
if err != nil {
return outFile, fmt.Errorf("field %s: %w", fieldName, err)
}
fieldValues = append(fieldValues, v)
}
writer.Write([]byte(fmt.Sprintf("%s %d\n",
strings.Join(fieldValues, ";"),
record.Cnt.ValueByName(c.countField),
)))
}
writer.Flush()
return outFile, nil
}
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