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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 binary
import (
"fmt"
"sync"
"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"
"github.com/m3db/m3/src/x/opentracing"
)
type baseOp struct {
OperatorType string
processFunc processFunc
params NodeParams
}
// OpType for the operator.
func (o baseOp) OpType() string {
return o.OperatorType
}
func (o baseOp) String() string {
return fmt.Sprintf("type: %s, lnode: %s, rnode: %s", o.OpType(),
o.params.LNode, o.params.RNode)
}
// Node creates an execution node.
func (o baseOp) Node(
controller *transform.Controller,
_ transform.Options,
) transform.OpNode {
return &baseNode{
op: o,
process: o.processFunc,
controller: controller,
cache: transform.NewBlockCache(),
}
}
// ArithmeticFunction returns the arithmetic function for this operation type.
func ArithmeticFunction(opType string, returnBool bool) (binaryFunction, error) {
if fn, ok := arithmeticFuncs[opType]; ok {
return fn, nil
}
// For comparison functions, check if returning bool or not and return the
// appropriate one.
if returnBool {
opType += returnBoolSuffix
}
if fn, ok := comparisonFuncs[opType]; ok {
return fn, nil
}
return nil, fmt.Errorf("no arithmetic function found for type: %s", opType)
}
// NewOp creates a new binary operation.
func NewOp(
opType string,
params NodeParams,
) (parser.Params, error) {
if params.VectorMatcherBuilder == nil {
params.VectorMatcherBuilder = defaultVectorMatcherBuilder
}
fn, ok := buildLogicalFunction(opType, params)
if !ok {
fn, ok = buildArithmeticFunction(opType, params)
if !ok {
fn, ok = buildComparisonFunction(opType, params)
if !ok {
return baseOp{}, fmt.Errorf("operator not supported: %s", opType)
}
}
}
return baseOp{
OperatorType: opType,
processFunc: fn,
params: params,
}, nil
}
type baseNode struct {
op baseOp
process processFunc
controller *transform.Controller
cache *transform.BlockCache
mu sync.Mutex
}
func (n *baseNode) Params() parser.Params {
return n.op
}
type processFunc func(*models.QueryContext, block.Block,
block.Block, *transform.Controller) (block.Block, error)
// Process processes a block.
func (n *baseNode) Process(queryCtx *models.QueryContext,
ID parser.NodeID, b block.Block) error {
lhs, rhs, err := n.computeOrCache(ID, b)
if err != nil {
// Clean up any blocks from cache
n.cleanup()
return err
}
// Both blocks are not ready
if lhs == nil || rhs == nil {
return nil
}
n.cleanup()
nextBlock, err := n.processWithTracing(queryCtx, lhs, rhs)
if err != nil {
return err
}
defer nextBlock.Close()
return n.controller.Process(queryCtx, nextBlock)
}
func (n *baseNode) processWithTracing(queryCtx *models.QueryContext,
lhs block.Block, rhs block.Block) (block.Block, error) {
sp, ctx := opentracing.StartSpanFromContext(queryCtx.Ctx, n.op.OpType())
defer sp.Finish()
queryCtx = queryCtx.WithContext(ctx)
return n.process(queryCtx, lhs, rhs, n.controller)
}
// computeOrCache figures out if both lhs and rhs are available,
// if not then it caches the incoming block.
func (n *baseNode) computeOrCache(
ID parser.NodeID,
b block.Block,
) (block.Block, block.Block, error) {
var lhs, rhs block.Block
n.mu.Lock()
defer n.mu.Unlock()
op := n.op
params := op.params
if params.LNode == ID {
rBlock, ok := n.cache.Get(params.RNode)
if !ok {
return lhs, rhs, n.cache.Add(ID, b)
}
rhs = rBlock
lhs = b
} else if params.RNode == ID {
lBlock, ok := n.cache.Get(params.LNode)
if !ok {
return lhs, rhs, n.cache.Add(ID, b)
}
lhs = lBlock
rhs = b
}
return lhs, rhs, nil
}
func (n *baseNode) cleanup() {
n.mu.Lock()
defer n.mu.Unlock()
params := n.op.params
n.cache.Remove(params.LNode)
n.cache.Remove(params.RNode)
}