forked from wallix/awless
/
session.go
171 lines (144 loc) · 4.82 KB
/
session.go
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/*
Copyright 2017 WALLIX
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 awsservices
import (
"fmt"
"net/http"
"os"
"time"
awssdk "github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/credentials/stscreds"
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/aws/request"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/wallix/awless/aws/config"
"github.com/wallix/awless/logger"
)
func ResolveRegionFromEnv() (region string) {
var sess *session.Session
var err error
if sess, err = newSessionResolver().resolve(); err == nil {
region = awssdk.StringValue(sess.Config.Region)
}
if awsconfig.IsValidRegion(region) {
fmt.Fprintf(os.Stderr, "Found existing AWS region '%s'. Setting it as your default region.\n", region)
} else if sess != nil {
if r, err := ec2metadata.New(sess).Region(); err == nil {
fmt.Fprintf(os.Stderr, "Found AWS region '%s' from local EC2 instance metadata. Setting it as your default region.\n", r)
region = r
}
}
if !awsconfig.IsValidRegion(region) {
region = awsconfig.StdinRegionSelector()
fmt.Println()
}
return
}
type sessionResolver struct {
region, profile string
profileSetterCallback func(val string) error
httpClient *http.Client
credentialHTTPClient *http.Client
logger *logger.Logger
enableRequestsFullLogging bool
enableNetworkMonitorRequestsHandlers bool
enableCredentialResolvers bool
}
func newSessionResolver() *sessionResolver {
return &sessionResolver{
credentialHTTPClient: &http.Client{Timeout: 1 * time.Second},
httpClient: http.DefaultClient,
profileSetterCallback: func(val string) error { return nil },
logger: logger.DiscardLogger,
}
}
func (s *sessionResolver) withRegion(region string) *sessionResolver {
s.region = region
return s
}
func (s *sessionResolver) withProfile(profile string) *sessionResolver {
s.profile = profile
return s
}
func (s *sessionResolver) withCredentialResolvers() *sessionResolver {
s.enableCredentialResolvers = true
return s
}
func (s *sessionResolver) withProfileSetter(f func(val string) error) *sessionResolver {
s.profileSetterCallback = f
return s
}
func (s *sessionResolver) withLogger(l *logger.Logger) *sessionResolver {
s.logger = l
return s
}
func (s *sessionResolver) withNetworkMonitor(enableNetworkMonitor bool) *sessionResolver {
s.enableNetworkMonitorRequestsHandlers = enableNetworkMonitor
return s
}
func (s *sessionResolver) resolve() (*session.Session, error) {
session, err := session.NewSessionWithOptions(session.Options{
Config: awssdk.Config{
Region: awssdk.String(s.region),
HTTPClient: s.credentialHTTPClient,
CredentialsChainVerboseErrors: awssdk.Bool(true),
},
SharedConfigState: session.SharedConfigEnable,
AssumeRoleTokenProvider: stscreds.StdinTokenProvider,
Profile: s.profile,
})
if err != nil {
return nil, err
}
if s.enableRequestsFullLogging {
session.Config = session.Config.WithLogLevel(awssdk.LogDebugWithHTTPBody)
}
session.Handlers.Retry.PushFront(func(req *request.Request) {
if req.IsErrorThrottle() && s.logger != nil {
s.logger.Verbosef("retrying %s: %s: %s", req.Operation.Name, req.Error.(awserr.Error).Code(), req.Error.(awserr.Error).Message())
}
})
if s.enableNetworkMonitorRequestsHandlers {
session.Handlers.Send.PushFront(func(r *request.Request) {
DefaultNetworkMonitor.addRequest(r)
})
session.Handlers.Complete.PushBack(func(r *request.Request) {
DefaultNetworkMonitor.setRequestEnd(r)
})
}
if s.enableCredentialResolvers {
session.Config.Credentials = credentials.NewCredentials(
&credentials.ChainProvider{
VerboseErrors: true,
Providers: []credentials.Provider{
&fileCacheProvider{
creds: session.Config.Credentials,
profile: s.profile,
log: s.logger,
},
&credentialsPrompterProvider{
profile: s.profile,
out: os.Stderr,
profileSetterCallback: s.profileSetterCallback,
},
},
})
if _, err = session.Config.Credentials.Get(); err != nil {
return session, err
}
}
session.Config.HTTPClient = s.httpClient
return session, nil
}