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Add rate limiting when calling STS assume role API
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/* | ||
Copyright 2014 The Kubernetes 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. | ||
*/ | ||
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package aws | ||
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import ( | ||
"sync" | ||
"time" | ||
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"github.com/aws/aws-sdk-go/aws/credentials" | ||
) | ||
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const ( | ||
invalidateCredsAfter = 1 * time.Second | ||
) | ||
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// assumeRoleProviderWithRateLimiting makes sure we call the underlying provider only | ||
// once after `invalidateCredsAfter` period | ||
type assumeRoleProviderWithRateLimiting struct { | ||
provider credentials.Provider | ||
invalidateCredsAfter time.Duration | ||
sync.RWMutex | ||
lastError error | ||
lastValue credentials.Value | ||
lastRetrieveTime time.Time | ||
} | ||
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func assumeRoleProvider(provider credentials.Provider) credentials.Provider { | ||
return &assumeRoleProviderWithRateLimiting{provider: provider, | ||
invalidateCredsAfter: invalidateCredsAfter} | ||
} | ||
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func (l *assumeRoleProviderWithRateLimiting) Retrieve() (credentials.Value, error) { | ||
l.Lock() | ||
defer l.Unlock() | ||
if time.Since(l.lastRetrieveTime) < l.invalidateCredsAfter { | ||
if l.lastError != nil { | ||
return credentials.Value{}, l.lastError | ||
} | ||
return l.lastValue, nil | ||
} | ||
l.lastValue, l.lastError = l.provider.Retrieve() | ||
l.lastRetrieveTime = time.Now() | ||
return l.lastValue, l.lastError | ||
} | ||
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func (l *assumeRoleProviderWithRateLimiting) IsExpired() bool { | ||
return l.provider.IsExpired() | ||
} |
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/* | ||
Copyright 2014 The Kubernetes 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. | ||
*/ | ||
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package aws | ||
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import ( | ||
"fmt" | ||
"reflect" | ||
"sync" | ||
"testing" | ||
"time" | ||
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"github.com/aws/aws-sdk-go/aws/credentials" | ||
) | ||
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func Test_assumeRoleProviderWithRateLimiting_Retrieve(t *testing.T) { | ||
type fields struct { | ||
provider credentials.Provider | ||
invalidateCredsAfter time.Duration | ||
RWMutex sync.RWMutex | ||
lastError error | ||
lastValue credentials.Value | ||
lastRetrieveTime time.Time | ||
} | ||
tests := []struct { | ||
name string | ||
fields *fields | ||
want credentials.Value | ||
wantProviderCalled bool | ||
sleepBeforeCallingProvider time.Duration | ||
wantErr bool | ||
wantErrString string | ||
}{{ | ||
name: "Call assume role provider and verify access ID returned", | ||
fields: &fields{provider: &fakeAssumeRoleProvider{accesskeyID: "fakeID"}}, | ||
want: credentials.Value{AccessKeyID: "fakeID"}, | ||
wantProviderCalled: true, | ||
}, { | ||
name: "Immediate call to assume role API, shouldn't call the underlying provider and return the last value", | ||
fields: &fields{ | ||
provider: &fakeAssumeRoleProvider{accesskeyID: "fakeID"}, | ||
invalidateCredsAfter: 100 * time.Millisecond, | ||
lastValue: credentials.Value{AccessKeyID: "fakeID1"}, | ||
lastRetrieveTime: time.Now(), | ||
}, | ||
want: credentials.Value{AccessKeyID: "fakeID1"}, | ||
wantProviderCalled: false, | ||
sleepBeforeCallingProvider: 10 * time.Millisecond, | ||
}, { | ||
name: "Assume role provider returns an error when trying to assume a role", | ||
fields: &fields{ | ||
provider: &fakeAssumeRoleProvider{err: fmt.Errorf("can't assume fake role")}, | ||
invalidateCredsAfter: 10 * time.Millisecond, | ||
lastRetrieveTime: time.Now(), | ||
}, | ||
wantProviderCalled: true, | ||
wantErr: true, | ||
wantErrString: "can't assume fake role", | ||
sleepBeforeCallingProvider: 15 * time.Millisecond, | ||
}, { | ||
name: "Immediate call to assume role API, shouldn't call the underlying provider and return the last error value", | ||
fields: &fields{ | ||
provider: &fakeAssumeRoleProvider{}, | ||
invalidateCredsAfter: 100 * time.Millisecond, | ||
lastRetrieveTime: time.Now(), | ||
}, | ||
want: credentials.Value{}, | ||
wantProviderCalled: false, | ||
wantErr: true, | ||
wantErrString: "can't assume fake role", | ||
}, { | ||
name: "Delayed call to assume role API, should call the underlying provider", | ||
fields: &fields{ | ||
provider: &fakeAssumeRoleProvider{accesskeyID: "fakeID2"}, | ||
invalidateCredsAfter: 20 * time.Millisecond, | ||
lastRetrieveTime: time.Now(), | ||
}, | ||
want: credentials.Value{AccessKeyID: "fakeID2"}, | ||
wantProviderCalled: true, | ||
sleepBeforeCallingProvider: 25 * time.Millisecond, | ||
}} | ||
for _, tt := range tests { | ||
t.Run(tt.name, func(t *testing.T) { | ||
l := &assumeRoleProviderWithRateLimiting{ | ||
provider: tt.fields.provider, | ||
invalidateCredsAfter: tt.fields.invalidateCredsAfter, | ||
lastError: tt.fields.lastError, | ||
lastValue: tt.fields.lastValue, | ||
lastRetrieveTime: tt.fields.lastRetrieveTime, | ||
} | ||
time.Sleep(tt.sleepBeforeCallingProvider) | ||
got, err := l.Retrieve() | ||
if (err != nil) != tt.wantErr && (tt.wantErr && reflect.DeepEqual(err, tt.wantErrString)) { | ||
t.Errorf("assumeRoleProviderWithRateLimiting.Retrieve() error = %v, wantErr %v", err, tt.wantErr) | ||
return | ||
} | ||
if !reflect.DeepEqual(got, tt.want) { | ||
t.Errorf("assumeRoleProviderWithRateLimiting.Retrieve() got = %v, want %v", got, tt.want) | ||
return | ||
} | ||
if tt.wantProviderCalled != tt.fields.provider.(*fakeAssumeRoleProvider).providerCalled { | ||
t.Errorf("provider called %v, want %v", tt.fields.provider.(*fakeAssumeRoleProvider).providerCalled, tt.wantProviderCalled) | ||
} | ||
}) | ||
} | ||
} | ||
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type fakeAssumeRoleProvider struct { | ||
accesskeyID string | ||
err error | ||
providerCalled bool | ||
} | ||
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func (f *fakeAssumeRoleProvider) Retrieve() (credentials.Value, error) { | ||
f.providerCalled = true | ||
return credentials.Value{AccessKeyID: f.accesskeyID}, f.err | ||
} | ||
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func (f *fakeAssumeRoleProvider) IsExpired() bool { return true } |