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ctl_harness.go
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/
ctl_harness.go
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//
// (C) Copyright 2020 Intel Corporation.
//
// 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.
//
// GOVERNMENT LICENSE RIGHTS-OPEN SOURCE SOFTWARE
// The Government's rights to use, modify, reproduce, release, perform, display,
// or disclose this software are subject to the terms of the Apache License as
// provided in Contract No. 8F-30005.
// Any reproduction of computer software, computer software documentation, or
// portions thereof marked with this legend must also reproduce the markings.
//
package server
import (
"context"
"github.com/pkg/errors"
"github.com/daos-stack/daos/src/control/common/proto/convert"
mgmtpb "github.com/daos-stack/daos/src/control/common/proto/mgmt"
"github.com/daos-stack/daos/src/control/logging"
"github.com/daos-stack/daos/src/control/system"
)
// HarnessClient provides methods for requesting actions on remote harnesses
// (attached to listening gRPC servers) identified by host addresses.
//
// Results will be provided for each rank (member) managed by harness.
// Single gRPC sent over management network per harness (not per rank).
type HarnessClient interface {
Query(context.Context, string, ...uint32) (system.MemberResults, error)
PrepShutdown(context.Context, string, ...uint32) (system.MemberResults, error)
Stop(context.Context, string, bool, ...uint32) (system.MemberResults, error)
Start(context.Context, string, ...uint32) (system.MemberResults, error)
}
// harnessClient implements the HarnessClient interface.
type harnessClient struct {
log logging.Logger
localHarness *IOServerHarness
client *mgmtSvcClient
}
type harnessCall func(context.Context, string, mgmtpb.RanksReq) (*mgmtpb.RanksResp, error)
// prepareRequest will populate an MgmtSvcClient if missing and return RanksReq.
func (hc *harnessClient) prepareRequest(ranks []uint32, force bool) (*mgmtpb.RanksReq, error) {
if hc.client == nil {
mi, err := hc.localHarness.GetMSLeaderInstance()
if err != nil {
return nil, errors.Wrap(err, "prepare harness request")
}
hc.client = mi.msClient
}
if len(ranks) > maxIOServers {
return nil, errors.New("number of of ranks exceeds maximum")
}
return &mgmtpb.RanksReq{Ranks: ranks, Force: force}, nil
}
// call issues gRPC to remote harness using a supplied client function to the
// given address.
func (hc *harnessClient) call(ctx context.Context, addr string, rpcReq *mgmtpb.RanksReq, f harnessCall) (system.MemberResults, error) {
errChan := make(chan error)
var rpcResp *mgmtpb.RanksResp
go func() {
var innerErr error
rpcResp, innerErr = f(ctx, addr, *rpcReq)
errChan <- innerErr
}()
select {
case err := <-errChan:
if err != nil {
return nil, err
}
case <-ctx.Done():
return nil, ctx.Err()
}
memberResults := make(system.MemberResults, 0, maxIOServers)
if err := convert.Types(rpcResp.GetResults(), &memberResults); err != nil {
return nil, errors.Wrapf(err, "decoding response from %s", addr)
}
return memberResults, nil
}
// Query sends Status gRPC using the MgmtSvcClient to the control server at the
// specified address to guage the responsiveness of the specified ranks.
//
// Results are returned for the ranks specified in the input parameter
// if they are being managed by the remote control server.
func (hc *harnessClient) Query(ctx context.Context, addr string, ranks ...uint32) (system.MemberResults, error) {
rpcReq, err := hc.prepareRequest(ranks, false)
if err != nil {
return nil, err
}
return hc.call(ctx, addr, rpcReq, hc.client.Status)
}
// PrepShutdown sends PrepShutdown gRPC using the MgmtSvcClient to the control
// server at the specified address to prepare the specified ranks for a
// controlled shutdown.
//
// Results are returned for the ranks specified in the input parameter
// if they are being managed by the remote control server.
func (hc *harnessClient) PrepShutdown(ctx context.Context, addr string, ranks ...uint32) (system.MemberResults, error) {
rpcReq, err := hc.prepareRequest(ranks, false)
if err != nil {
return nil, err
}
return hc.call(ctx, addr, rpcReq, hc.client.PrepShutdown)
}
// Stop sends Stop gRPC using the MgmtSvcClient to the control server at the
// specified address to terminate the specified ranks.
//
// Results are returned for the ranks specified in the input parameter
// if they are being managed by the remote control server.
//
// Ranks will be forcefully stopped if the force parameter is specified.
func (hc *harnessClient) Stop(ctx context.Context, addr string, force bool, ranks ...uint32) (system.MemberResults, error) {
rpcReq, err := hc.prepareRequest(ranks, force)
if err != nil {
return nil, err
}
return hc.call(ctx, addr, rpcReq, hc.client.Stop)
}
// Start sends Start gRPC using the MgmtSvcClient to the control server at the
// specified address to start the specified ranks.
//
// Results are returned for the ranks specified in the input parameter
// if they are being managed by the remote control server.
func (hc *harnessClient) Start(ctx context.Context, addr string, ranks ...uint32) (system.MemberResults, error) {
rpcReq, err := hc.prepareRequest(ranks, false)
if err != nil {
return nil, err
}
return hc.call(ctx, addr, rpcReq, hc.client.Start)
}
// NewHarnessClient returns a new harnessClient reference containing a reference
// to the harness on the locally running control server.
func NewHarnessClient(l logging.Logger, h *IOServerHarness) HarnessClient {
return &harnessClient{log: l, localHarness: h}
}