/
client.go
121 lines (104 loc) · 2.89 KB
/
client.go
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/*
* Copyright 2018, CS Systemes d'Information, http://www.c-s.fr
*
* 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 client
import (
"fmt"
"strings"
"time"
"github.com/pkg/errors"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"github.com/CS-SI/SafeScale/broker/utils"
)
// Session units the different resources proposed by brokerd as broker client
type Session struct {
Bucket *bucket
Host *host
Share *share
Network *network
Ssh *ssh
Tenant *tenant
Volume *volume
Template *template
Image *image
brokerdHost string
brokerdPort int
connection *grpc.ClientConn
tenantName string
}
// Client is a instance of Session used temporarily until the session logic in brokerd is implemented
type Client *Session
// DefaultTimeout tells to use the timeout by default depending on context
const (
DefaultConnectionTimeout = 30 * time.Second
DefaultExecutionTimeout = 5 * time.Minute
)
// New returns an instance of broker Client
func New() Client {
s := &Session{
brokerdHost: "localhost",
brokerdPort: 50051,
}
s.Bucket = &bucket{session: s}
s.Host = &host{session: s}
s.Share = &share{session: s}
s.Network = &network{session: s}
s.Ssh = &ssh{session: s}
s.Tenant = &tenant{session: s}
s.Volume = &volume{session: s}
s.Template = &template{session: s}
s.Image = &image{session: s}
return s
}
// Connect establishes connection with brokerd
func (s *Session) Connect() {
if s.connection == nil {
s.connection = utils.GetConnection(s.brokerdHost, s.brokerdPort)
}
}
// Disconnect cuts the connection with brokerd
func (s *Session) Disconnect() {
if s.connection != nil {
s.connection.Close()
s.connection = nil
}
}
// DecorateError changes the error to something more comprehensible when
// timeout occured
func DecorateError(err error, action string, maySucceed bool) error {
if IsTimeout(err) {
msg := "%s took too long (> %v) to respond"
if maySucceed {
msg += " (may eventually succeed)"
}
return fmt.Errorf(msg, action, DefaultExecutionTimeout)
}
msg := err.Error()
if strings.Index(msg, "desc = ") != -1 {
pos := strings.Index(msg, "desc = ") + 7
msg = msg[pos:]
if strings.Index(msg, " :") == 0 {
msg = msg[2:]
}
return errors.New(msg)
}
return err
}
// IsTimeout tells if the err is a timeout kind
func IsTimeout(err error) bool {
return status.Code(err) == codes.DeadlineExceeded
}