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launch_query.go
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launch_query.go
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/*
* Copyright 2018- The Pixie Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* SPDX-License-Identifier: Apache-2.0
*/
package controllers
import (
"fmt"
"golang.org/x/sync/errgroup"
"github.com/gofrs/uuid"
"github.com/nats-io/nats.go"
"px.dev/pixie/src/carnot/planpb"
"px.dev/pixie/src/utils"
"px.dev/pixie/src/vizier/messages/messagespb"
"px.dev/pixie/src/vizier/utils/messagebus"
)
// LaunchQuery launches a query by sending query fragments to relevant agents.
func LaunchQuery(queryID uuid.UUID, natsConn *nats.Conn, planMap map[uuid.UUID]*planpb.Plan, analyze bool) error {
if len(planMap) == 0 {
return fmt.Errorf("Received no agent plans for query %s", queryID.String())
}
queryIDPB := utils.ProtoFromUUID(queryID)
// Broadcast query to all the agents in parallel.
var eg errgroup.Group
broadcastToAgent := func(agentID uuid.UUID, logicalPlan *planpb.Plan) error {
// Create NATS message containing the query string.
msg := messagespb.VizierMessage{
Msg: &messagespb.VizierMessage_ExecuteQueryRequest{
ExecuteQueryRequest: &messagespb.ExecuteQueryRequest{
QueryID: queryIDPB,
Plan: logicalPlan,
Analyze: analyze,
},
},
}
agentTopic := messagebus.AgentUUIDTopic(agentID)
msgAsBytes, err := msg.Marshal()
if err != nil {
return err
}
err = natsConn.Publish(agentTopic, msgAsBytes)
if err != nil {
return err
}
return nil
}
for agentID, logicalPlan := range planMap {
agentID := agentID
logicalPlan := logicalPlan
eg.Go(func() error {
return broadcastToAgent(agentID, logicalPlan)
})
}
if err := eg.Wait(); err != nil {
return err
}
return nil
}