/
base.go
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/
base.go
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// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package tag
import (
"fmt"
"github.com/m3db/m3/src/query/block"
"github.com/m3db/m3/src/query/executor/transform"
"github.com/m3db/m3/src/query/models"
"github.com/m3db/m3/src/query/parser"
)
// Applies the given transform to block tags and series tags.
type tagTransformFunc func(
block.Metadata,
[]block.SeriesMeta,
) (block.Metadata, []block.SeriesMeta)
// NewTagOp creates a new tag transform operation.
func NewTagOp(
opType string,
params []string,
) (parser.Params, error) {
var (
fn tagTransformFunc
err error
)
switch opType {
case TagJoinType:
fn, err = makeTagJoinFunc(params)
case TagReplaceType:
fn, err = makeTagReplaceFunc(params)
default:
return nil, fmt.Errorf("operator not supported: %s", opType)
}
if err != nil {
return nil, err
}
return newBaseOp(opType, fn), nil
}
// baseOp stores required properties for the baseOp
type baseOp struct {
opType string
tagFn tagTransformFunc
}
// OpType for the operator.
func (o baseOp) OpType() string {
return o.opType
}
// String representation.
func (o baseOp) String() string {
return fmt.Sprintf("type: %s", o.OpType())
}
// Node creates a tag execution node.
func (o baseOp) Node(controller *transform.Controller, _ transform.Options) transform.OpNode {
return &baseNode{
op: o,
controller: controller,
}
}
func newBaseOp(opType string, tagFn tagTransformFunc) baseOp {
return baseOp{
opType: opType,
tagFn: tagFn,
}
}
type baseNode struct {
op baseOp
controller *transform.Controller
}
func (n *baseNode) Params() parser.Params {
return n.op
}
// Process the block.
func (n *baseNode) Process(queryCtx *models.QueryContext, ID parser.NodeID, b block.Block) error {
return transform.ProcessSimpleBlock(n, n.controller, queryCtx, ID, b)
}
func (n *baseNode) ProcessBlock(queryCtx *models.QueryContext, ID parser.NodeID, b block.Block) (block.Block, error) {
it, err := b.StepIter()
if err != nil {
return nil, err
}
meta := it.Meta()
seriesMeta := it.SeriesMeta()
meta, seriesMeta = n.op.tagFn(meta, seriesMeta)
return b.WithMetadata(meta, seriesMeta)
}