metrics have been added

1 files changed, 89 insertions, 0 deletions

diff --git a/library/go/core/metrics/solomon/stream.go b/library/go/core/metrics/solomon/stream.go
new file mode 100644
index 0000000000..7cf6d70064
--- /dev/null
+++ b/library/go/core/metrics/solomon/stream.go
@@ -0,0 +1,89 @@
+package solomon
+
+import (
+	"context"
+	"encoding/json"
+	"io"
+
+	"github.com/ydb-platform/ydb/library/go/core/xerrors"
+)
+
+const HeaderSize = 24
+
+type StreamFormat string
+
+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)
+}