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request.go
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request.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 executor
import (
"context"
"fmt"
"github.com/m3db/m3/src/query/models"
"github.com/m3db/m3/src/query/parser"
"github.com/m3db/m3/src/query/plan"
"github.com/m3db/m3/src/query/util/logging"
"github.com/m3db/m3/src/query/util/opentracing"
"go.uber.org/zap"
)
// State is the request state.
type State int
const (
compiling State = iota
planning
executing
all
)
func (s State) String() string {
switch s {
case compiling:
return "compiling"
case planning:
return "planning"
case executing:
return "executing"
case all:
return "all"
default:
return "unknown"
}
}
func (s State) durationString() string {
return fmt.Sprintf("%s_duration_seconds", s)
}
// Request represents a single request.
type Request struct {
engine *Engine
params models.RequestParams
}
func newRequest(engine *Engine, params models.RequestParams) *Request {
return &Request{engine: engine, params: params}
}
func (r *Request) compile(ctx context.Context, parser parser.Parser) (parser.Nodes, parser.Edges, error) {
sp, ctx := opentracingutil.StartSpanFromContext(ctx, "compile")
defer sp.Finish()
// TODO: Change DAG interface to take in a context
nodes, edges, err := parser.DAG()
if err != nil {
return nil, nil, err
}
if r.params.Debug {
logging.WithContext(ctx).Info("compiling dag", zap.Any("nodes", nodes), zap.Any("edges", edges))
}
return nodes, edges, nil
}
func (r *Request) plan(ctx context.Context, nodes parser.Nodes, edges parser.Edges) (plan.PhysicalPlan, error) {
sp, ctx := opentracingutil.StartSpanFromContext(ctx, "plan")
defer sp.Finish()
lp, err := plan.NewLogicalPlan(nodes, edges)
if err != nil {
return plan.PhysicalPlan{}, err
}
if r.params.Debug {
logging.WithContext(ctx).Info("logical plan", zap.String("plan", lp.String()))
}
pp, err := plan.NewPhysicalPlan(lp, r.engine.store, r.params, r.engine.lookbackDuration)
if err != nil {
return plan.PhysicalPlan{}, err
}
if r.params.Debug {
logging.WithContext(ctx).Info("physical plan", zap.String("plan", pp.String()))
}
return pp, nil
}
func (r *Request) generateExecutionState(ctx context.Context, pp plan.PhysicalPlan) (*ExecutionState, error) {
sp, ctx := opentracingutil.StartSpanFromContext(ctx,
"generate_execution_state")
defer sp.Finish()
state, err := GenerateExecutionState(pp, r.engine.store)
// free up resources
if err != nil {
return nil, err
}
if r.params.Debug {
logging.WithContext(ctx).Info("execution state", zap.String("state", state.String()))
}
return state, nil
}