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|
package solomon
import (
"context"
"encoding/json"
"io"
"github.com/ydb-platform/ydb/library/go/core/xerrors"
)
const HeaderSize = 24
type StreamFormat string
const (
StreamSpack StreamFormat = "spack"
StreamJSON StreamFormat = "json"
)
func (r *Registry) Stream(ctx context.Context, w io.Writer) (written int, err error) {
if r.streamFormat == StreamJSON {
return r.StreamJSON(ctx, w)
}
return r.StreamSpack(ctx, w, CompressionLz4)
}
func (r *Registry) StreamJSON(ctx context.Context, w io.Writer) (written int, err error) {
cw := newCompressedWriter(w, CompressionNone)
if ctx.Err() != nil {
return written, xerrors.Errorf("streamJSON context error: %w", ctx.Err())
}
_, err = cw.Write([]byte("{\"metrics\":["))
if err != nil {
return written, xerrors.Errorf("write metrics failed: %w", err)
}
first := true
r.metrics.Range(func(_, s interface{}) bool {
if ctx.Err() != nil {
err = xerrors.Errorf("streamJSON context error: %w", ctx.Err())
return false
}
// write trailing comma
if !first {
_, err = cw.Write([]byte(","))
if err != nil {
err = xerrors.Errorf("write metrics failed: %w", err)
return false
}
}
var b []byte
b, err = json.Marshal(s)
if err != nil {
err = xerrors.Errorf("marshal metric failed: %w", err)
return false
}
// write metric json
_, err = cw.Write(b)
if err != nil {
err = xerrors.Errorf("write metric failed: %w", err)
return false
}
first = false
return true
})
if err != nil {
return written, err
}
if ctx.Err() != nil {
return written, xerrors.Errorf("streamJSON context error: %w", ctx.Err())
}
_, err = cw.Write([]byte("]}"))
if err != nil {
return written, xerrors.Errorf("write metrics failed: %w", err)
}
if ctx.Err() != nil {
return written, xerrors.Errorf("streamJSON context error: %w", ctx.Err())
}
err = cw.Close()
if err != nil {
return written, xerrors.Errorf("close failed: %w", err)
}
return cw.(*noCompressionWriteCloser).written, nil
}
func (r *Registry) StreamSpack(ctx context.Context, w io.Writer, compression CompressionType) (int, error) {
metrics, err := r.Gather()
if err != nil {
return 0, err
}
return NewSpackEncoder(ctx, compression, metrics).Encode(w)
}
|
