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package dynamodb
import (
"encoding/json"
"gopkg.in/check.v1"
"io"
"io/ioutil"
"net/http"
"net/http/httptest"
"strings"
"time"
"github.com/AdRoll/goamz/aws"
)
type RetrySuite struct {
NumCallsToFail int
ExpectError bool
ErrorType string
ErrorStatusCode int
TableDescriptionT TableDescriptionT
DynamoDBTest
}
func (s *RetrySuite) SetUpSuite(c *check.C) {
setUpAuth(c)
s.TableDescriptionT = TableDescriptionT{
TableName: "DynamoDBTestMyTable",
AttributeDefinitions: []AttributeDefinitionT{
AttributeDefinitionT{"TestHashKey", "S"},
},
KeySchema: []KeySchemaT{
KeySchemaT{"TestHashKey", "HASH"},
},
ProvisionedThroughput: ProvisionedThroughputT{
ReadCapacityUnits: 1,
WriteCapacityUnits: 1,
},
}
s.DynamoDBTest.TableDescriptionT = s.TableDescriptionT
s.server = New(dynamodb_auth, dynamodb_region)
pk, err := s.TableDescriptionT.BuildPrimaryKey()
if err != nil {
c.Skip(err.Error())
}
s.table = s.server.NewTable(s.TableDescriptionT.TableName, pk)
// Cleanup
s.TearDownSuite(c)
_, err = s.server.CreateTable(s.TableDescriptionT)
if err != nil {
c.Fatal(err)
}
s.WaitUntilStatus(c, "ACTIVE")
}
// Expect to succeed after a throttling exception.
var retry_suite_1 = &RetrySuite{
NumCallsToFail: 1,
ExpectError: false,
ErrorType: "com.amazonaws.dynamodb.v20120810#ProvisionedThroughputExceededException",
ErrorStatusCode: 400,
}
// Expect to succeed after 2 500 responses.
var retry_suite_2 = &RetrySuite{
NumCallsToFail: 2,
ExpectError: false,
ErrorType: "not a reason to retry",
ErrorStatusCode: 500,
}
// Expect to fail after exceeding max retries.
var retry_suite_3 = &RetrySuite{
NumCallsToFail: 3,
ExpectError: true, // retry twice
ErrorType: "not a reason to retry",
ErrorStatusCode: 500,
}
// Expect to fail due to not having a reason to retry.
var retry_suite_4 = &RetrySuite{
NumCallsToFail: 1,
ExpectError: true,
ErrorType: "not a reason to retry",
ErrorStatusCode: 400,
}
var _ = check.Suite(retry_suite_1)
var _ = check.Suite(retry_suite_2)
var _ = check.Suite(retry_suite_3)
var _ = check.Suite(retry_suite_4)
type retryPolicy struct {
numCalls int
}
func (w *retryPolicy) ShouldRetry(target string, r *http.Response, err error, numRetries int) bool {
w.numCalls++
dynamodbPolicy := aws.DynamoDBRetryPolicy{}
if !dynamodbPolicy.ShouldRetry(target, r, err, numRetries) {
return false
}
return w.numCalls < 3
}
func (w *retryPolicy) Delay(target string, r *http.Response, err error, numRetries int) time.Duration {
return 0
}
func (s *RetrySuite) TestRetryPolicy(c *check.C) {
// Save off the real endpoint, and then point it at a local proxy.
endpoint := s.table.Server.Region.DynamoDBEndpoint
policy := s.table.Server.RetryPolicy
defer func() {
s.table.Server.Region.DynamoDBEndpoint = endpoint
s.table.Server.RetryPolicy = policy
}()
numCalls := 0
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
numCalls++
// Fake a failure the requested amount of times.
if numCalls <= s.NumCallsToFail {
b, _ := json.Marshal(map[string]interface{}{
"__type": s.ErrorType,
"Code": "blah",
})
w.WriteHeader(s.ErrorStatusCode)
io.WriteString(w, string(b))
return
}
// Otherwise, proxy to actual DynamoDB endpoint. We reformat the request
// with the same content.
body, err := ioutil.ReadAll(r.Body)
if err != nil {
c.Fatal(err)
}
newr, err := http.NewRequest("POST", endpoint+"/", strings.NewReader(string(body)))
headersToKeep := map[string]bool{
"Content-Type": true,
"X-Amz-Date": true,
"X-Amz-Target": true,
"X-Amz-Security-Token": true,
}
for h, _ := range r.Header {
if _, ok := headersToKeep[h]; ok {
newr.Header.Set(h, r.Header.Get(h))
}
}
signer := aws.NewV4Signer(s.table.Server.Auth, "dynamodb", s.table.Server.Region)
signer.Sign(newr)
resp, err := http.DefaultClient.Do(newr)
if err != nil {
c.Fatal(err)
}
body, err = ioutil.ReadAll(resp.Body)
defer resp.Body.Close()
if err != nil {
c.Fatal(err)
}
w.WriteHeader(resp.StatusCode)
io.WriteString(w, string(body))
}))
defer server.Close()
rp := &retryPolicy{}
s.table.Server.RetryPolicy = rp
s.table.Server.Region.DynamoDBEndpoint = server.URL
// Now make the request.
k := &Key{HashKey: "NewHashKeyVal"}
in := map[string]interface{}{
"Attr1": "Attr1Val",
"Attr2": 12,
}
err := s.table.PutDocument(k, in)
if s.ExpectError {
if err == nil {
c.Fatalf("Expected error")
}
} else {
if err != nil {
c.Fatal(err)
}
}
if rp.numCalls != s.NumCallsToFail {
c.Fatalf("Expected %d failed calls, saw %d", s.NumCallsToFail, rp.numCalls)
}
}
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