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table.go
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table.go
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package otelschema
import (
"strings"
"github.com/ClickHouse/ch-go/proto"
"github.com/go-faster/jx"
"go.opentelemetry.io/collector/pdata/pcommon"
"github.com/go-faster/oteldb/internal/otelstorage"
)
// Appendable is a column that can append values.
type Appendable interface {
AppendAttribute(v pcommon.Value)
AppendZero()
}
// AppendableColumn is a column that can append values.
type AppendableColumn interface {
Appendable
proto.Column
}
// TypedColumn is a column that can append values of a given type.
type TypedColumn[T any] struct {
proto.ColumnOf[T]
Append func(col proto.ColumnOf[T], v pcommon.Value)
}
// AppendAttribute appends an attribute to the column.
func (t *TypedColumn[T]) AppendAttribute(v pcommon.Value) {
t.Append(t.ColumnOf, v)
}
// AppendZero appends a zero value to the column.
func (t *TypedColumn[T]) AppendZero() {
var v T
t.ColumnOf.Append(v)
}
// AttributeColumn is a column with a normalized name.
type AttributeColumn struct {
Key string
Name string
Column AppendableColumn
}
// Table is a table with normalized column names.
type Table struct {
encoder jx.Encoder
// Raw json.
Raw proto.ColStr
// Columns normalized.
Columns []AttributeColumn
}
// Reset resets table columns.
func (t *Table) Reset() {
t.encoder.Reset()
t.Raw.Reset()
for _, c := range t.Columns {
c.Column.Reset()
}
}
// Append appends attributes to the table.
func (t *Table) Append(attrs otelstorage.Attrs) {
kv := attrs.AsMap()
t.encoder.Reset()
appendZeroes := make(map[string]struct{}, len(t.Columns))
for _, c := range t.Columns {
appendZeroes[c.Key] = struct{}{}
}
t.encoder.ObjStart()
kv.Range(func(k string, v pcommon.Value) bool {
for _, c := range t.Columns {
if c.Key == k {
c.Column.AppendAttribute(v)
delete(appendZeroes, k)
return true
}
}
t.encoder.Field(k, func(e *jx.Encoder) {
switch v.Type() {
case pcommon.ValueTypeStr:
e.Str(v.Str())
case pcommon.ValueTypeInt:
e.Int64(v.Int())
default:
e.Null()
}
})
return true
})
t.encoder.ObjEnd()
t.Raw.AppendBytes(t.encoder.Bytes())
for _, c := range t.Columns {
if _, ok := appendZeroes[c.Key]; !ok {
continue
}
c.Column.AppendZero()
}
}
func newTypedColumn(t proto.ColumnType) AppendableColumn {
switch t {
case proto.ColumnTypeString:
return &TypedColumn[string]{
ColumnOf: new(proto.ColStr),
Append: func(col proto.ColumnOf[string], v pcommon.Value) { col.Append(v.Str()) },
}
case proto.ColumnTypeInt64:
return &TypedColumn[int64]{
ColumnOf: new(proto.ColInt64),
Append: func(col proto.ColumnOf[int64], v pcommon.Value) { col.Append(v.Int()) },
}
default:
panic("unknown column type")
}
}
// Input returns input for a ClickHouse query.
func (t *Table) Input() proto.Input {
out := proto.Input{
{
Name: "raw",
Data: &t.Raw,
},
}
for _, c := range t.Columns {
out = append(out, proto.InputColumn{
Name: c.Name,
Data: c.Column,
})
}
return out
}
// AttributeInfo describes a column.
type AttributeInfo struct {
Name string // col.name
Type proto.ColumnType
}
// NewTable creates a new table with normalized column names.
func NewTable(columns []AttributeInfo) *Table {
t := &Table{
Raw: proto.ColStr{},
}
for _, c := range columns {
mappedName := strings.ReplaceAll(c.Name, ".", "_")
t.Columns = append(t.Columns, AttributeColumn{
Key: c.Name,
Name: mappedName,
Column: newTypedColumn(c.Type),
})
}
return t
}