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executor.go
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executor.go
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// Copyright © 2016 Asteris, LLC
//
// 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.
package rpc
import (
"context"
"encoding/json"
"google.golang.org/grpc/metadata"
"github.com/asteris-llc/converge/apply"
"github.com/asteris-llc/converge/graph"
"github.com/asteris-llc/converge/healthcheck"
"github.com/asteris-llc/converge/plan"
"github.com/asteris-llc/converge/prettyprinters/human"
"github.com/asteris-llc/converge/rpc/pb"
"github.com/pkg/errors"
)
var (
errAuthNotProvided = errors.New("authorization not provided")
)
type executor struct {
auth *authorizer
}
type statusResponseStream interface {
Send(*pb.StatusResponse) error
SendHeader(metadata.MD) error
}
func (e *executor) edgeMeta(ctx context.Context, g *graph.Graph) (metadata.MD, error) {
logger := getLogger(ctx).WithField("function", "executor.edgeMeta")
edges, err := json.Marshal(g.Edges())
if err != nil {
logger.WithError(err).Error("could not serialize edges")
return nil, errors.Wrapf(err, "serializing edges")
}
return metadata.New(map[string]string{"edges": string(edges)}), nil
}
func (e *executor) sendMeta(ctx context.Context, g *graph.Graph, stream statusResponseStream) error {
logger := getLogger(ctx).WithField("function", "executor.sendMeta")
// dehydrate graph edges and send them in the header metadata
meta, err := e.edgeMeta(ctx, g)
if err != nil {
// already logged, don't log here
return errors.Wrap(err, "preparing metadata")
}
if err = stream.SendHeader(meta); err != nil {
logger.WithError(err).Error("could not send metadata")
return errors.Wrap(err, "sending metadata")
}
return nil
}
func (e *executor) stageNotifier(stage pb.StatusResponse_Stage, stream statusResponseStream) *graph.Notifier {
return &graph.Notifier{
Pre: func(id string) error {
return stream.Send(&pb.StatusResponse{
Id: id,
Stage: stage,
Run: pb.StatusResponse_STARTED,
})
},
Post: func(id string, r interface{}) error {
response := statusResponseFromPrintable(
id,
r.(human.Printable),
stage,
pb.StatusResponse_FINISHED,
)
return stream.Send(response)
},
}
}
func (e *executor) sendPlan(ctx context.Context, stream statusResponseStream, in *graph.Graph) (*graph.Graph, error) {
out, err := plan.WithNotify(ctx, in, e.stageNotifier(pb.StatusResponse_PLAN, stream))
if err != nil && err != plan.ErrTreeContainsErrors {
return nil, err
}
return out, nil
}
func (e *executor) Plan(in *pb.LoadRequest, stream pb.Executor_PlanServer) error {
logger, ctx := setIDLogger(stream.Context())
logger = logger.WithField("function", "executor.Plan")
if err := e.auth.authorize(ctx); err != nil {
logger.WithError(err).Warning("authorization failed")
return errors.Wrap(err, "authorization failed")
}
loaded, err := in.Load(ctx)
if err != nil {
return err
}
if err = e.sendMeta(ctx, loaded, stream); err != nil {
return err
}
// send the plan
_, err = e.sendPlan(ctx, stream, loaded)
if err != nil {
logger.WithError(err).WithField("location", in.Location).Error("planning failed")
return errors.Wrapf(err, "planning %s", in.Location)
}
return nil
}
func (e *executor) sendHealthCheck(ctx context.Context, stream statusResponseStream, in *graph.Graph) (*graph.Graph, error) {
out, err := healthcheck.WithNotify(ctx, in, e.stageNotifier(pb.StatusResponse_PLAN, stream))
if err != nil && err != plan.ErrTreeContainsErrors {
return nil, err
}
return out, nil
}
func (e *executor) HealthCheck(in *pb.LoadRequest, stream pb.Executor_HealthCheckServer) error {
logger, ctx := setIDLogger(stream.Context())
logger = logger.WithField("function", "executor.Plan")
if err := e.auth.authorize(ctx); err != nil {
logger.WithError(err).Warning("authorization failed")
return errors.Wrap(err, "authorization failed")
}
loaded, err := in.Load(ctx)
if err != nil {
return err
}
if err = e.sendMeta(ctx, loaded, stream); err != nil {
return err
}
// send the plan
planned, err := e.sendPlan(ctx, stream, loaded)
if err != nil {
logger.WithError(err).WithField("location", in.Location).Error("planning failed")
return errors.Wrapf(err, "planning %s", in.Location)
}
_, err = e.sendHealthCheck(ctx, stream, planned)
if err != nil {
logger.WithError(err).WithField("location", in.Location).Error("health check failed")
return errors.Wrapf(err, "health check %s", in.Location)
}
return nil
}
func (e *executor) sendApply(ctx context.Context, stream statusResponseStream, in *graph.Graph) (*graph.Graph, error) {
out, err := apply.WithNotify(ctx, in, e.stageNotifier(pb.StatusResponse_APPLY, stream))
if err != nil && err != apply.ErrTreeContainsErrors {
return nil, err
}
return out, nil
}
func (e *executor) Apply(in *pb.LoadRequest, stream pb.Executor_ApplyServer) error {
logger, ctx := setIDLogger(stream.Context())
logger = logger.WithField("function", "executor.Apply")
if err := e.auth.authorize(ctx); err != nil {
logger.WithError(err).Warning("authorization failed")
return errors.Wrap(err, "authorization failed")
}
loaded, err := in.Load(ctx)
if err != nil {
return err
}
if err = e.sendMeta(ctx, loaded, stream); err != nil {
return err
}
_, err = e.sendApply(ctx, stream, loaded)
if err != nil {
return errors.Wrapf(err, "applying %s", in.Location)
}
return nil
}