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package aws
import (
"fmt"
"math"
"net/http"
"net/http/httputil"
"regexp"
"time"
"github.com/awslabs/aws-sdk-go/internal/endpoints"
)
type Service struct {
Config *Config
Handlers Handlers
ManualSend bool
ServiceName string
APIVersion string
Endpoint string
JSONVersion string
TargetPrefix string
RetryRules func(*Request) time.Duration
ShouldRetry func(*Request) bool
DefaultMaxRetries uint
}
var schemeRE = regexp.MustCompile("^([^:]+)://")
func NewService(config *Config) *Service {
svc := &Service{Config: config}
svc.Initialize()
return svc
}
func (s *Service) Initialize() {
if s.Config == nil {
s.Config = &Config{}
}
if s.Config.HTTPClient == nil {
s.Config.HTTPClient = http.DefaultClient
}
if s.RetryRules == nil {
s.RetryRules = retryRules
}
if s.ShouldRetry == nil {
s.ShouldRetry = shouldRetry
}
s.DefaultMaxRetries = 3
s.Handlers.Build.PushBack(UserAgentHandler)
s.Handlers.Sign.PushBack(BuildContentLength)
s.Handlers.Send.PushBack(SendHandler)
s.Handlers.AfterRetry.PushBack(AfterRetryHandler)
s.Handlers.ValidateResponse.PushBack(ValidateResponseHandler)
s.AddDebugHandlers()
s.buildEndpoint()
if !s.Config.DisableParamValidation {
s.Handlers.Validate.PushBack(ValidateParameters)
}
}
func (s *Service) buildEndpoint() {
if s.Config.Endpoint != "" {
s.Endpoint = s.Config.Endpoint
} else {
s.Endpoint = endpoints.EndpointForRegion(s.ServiceName, s.Config.Region)
}
if !schemeRE.MatchString(s.Endpoint) {
scheme := "https"
if s.Config.DisableSSL {
scheme = "http"
}
s.Endpoint = scheme + "://" + s.Endpoint
}
}
func (s *Service) AddDebugHandlers() {
out := s.Config.Logger
if s.Config.LogLevel == 0 {
return
}
s.Handlers.Sign.PushBack(func(r *Request) {
dumpedBody, _ := httputil.DumpRequest(r.HTTPRequest, true)
fmt.Fprintf(out, "=> [%s] %s.%s(%+v)\n", r.Time,
r.Service.ServiceName, r.Operation.Name, r.Params)
fmt.Fprintf(out, "---[ REQUEST PRE-SIGN ]------------------------------\n")
fmt.Fprintf(out, "%s\n", string(dumpedBody))
fmt.Fprintf(out, "-----------------------------------------------------\n")
})
s.Handlers.Send.PushFront(func(r *Request) {
dumpedBody, _ := httputil.DumpRequest(r.HTTPRequest, true)
fmt.Fprintf(out, "---[ REQUEST POST-SIGN ]-----------------------------\n")
fmt.Fprintf(out, "%s\n", string(dumpedBody))
fmt.Fprintf(out, "-----------------------------------------------------\n")
})
s.Handlers.Send.PushBack(func(r *Request) {
fmt.Fprintf(out, "---[ RESPONSE ]--------------------------------------\n")
if r.HTTPResponse != nil {
dumpedBody, _ := httputil.DumpResponse(r.HTTPResponse, true)
fmt.Fprintf(out, "%s\n", string(dumpedBody))
} else if r.Error != nil {
fmt.Fprintf(out, "%s\n", r.Error)
}
fmt.Fprintf(out, "-----------------------------------------------------\n")
})
}
func (s *Service) MaxRetries() uint {
if s.Config.MaxRetries < 0 {
return s.DefaultMaxRetries
} else {
return uint(s.Config.MaxRetries)
}
}
func retryRules(r *Request) time.Duration {
delay := time.Duration(math.Pow(2, float64(r.RetryCount))) * 30
return delay * time.Millisecond
}
func shouldRetry(r *Request) bool {
if err := Error(r.Error); err != nil {
if err.StatusCode >= 500 {
return true
}
switch err.Code {
case "ExpiredTokenException":
case "ProvisionedThroughputExceededException", "Throttling":
return true
}
}
return false
}
|
