1package aws 2 3import ( 4 "net/http" 5 "time" 6 7 "github.com/aws/aws-sdk-go/aws/credentials" 8 "github.com/aws/aws-sdk-go/aws/endpoints" 9) 10 11// UseServiceDefaultRetries instructs the config to use the service's own 12// default number of retries. This will be the default action if 13// Config.MaxRetries is nil also. 14const UseServiceDefaultRetries = -1 15 16// RequestRetryer is an alias for a type that implements the request.Retryer 17// interface. 18type RequestRetryer interface{} 19 20// A Config provides service configuration for service clients. By default, 21// all clients will use the defaults.DefaultConfig structure. 22// 23// // Create Session with MaxRetry configuration to be shared by multiple 24// // service clients. 25// sess := session.Must(session.NewSession(&aws.Config{ 26// MaxRetries: aws.Int(3), 27// })) 28// 29// // Create S3 service client with a specific Region. 30// svc := s3.New(sess, &aws.Config{ 31// Region: aws.String("us-west-2"), 32// }) 33type Config struct { 34 // Enables verbose error printing of all credential chain errors. 35 // Should be used when wanting to see all errors while attempting to 36 // retrieve credentials. 37 CredentialsChainVerboseErrors *bool 38 39 // The credentials object to use when signing requests. Defaults to a 40 // chain of credential providers to search for credentials in environment 41 // variables, shared credential file, and EC2 Instance Roles. 42 Credentials *credentials.Credentials 43 44 // An optional endpoint URL (hostname only or fully qualified URI) 45 // that overrides the default generated endpoint for a client. Set this 46 // to `""` to use the default generated endpoint. 47 // 48 // Note: You must still provide a `Region` value when specifying an 49 // endpoint for a client. 50 Endpoint *string 51 52 // The resolver to use for looking up endpoints for AWS service clients 53 // to use based on region. 54 EndpointResolver endpoints.Resolver 55 56 // EnforceShouldRetryCheck is used in the AfterRetryHandler to always call 57 // ShouldRetry regardless of whether or not if request.Retryable is set. 58 // This will utilize ShouldRetry method of custom retryers. If EnforceShouldRetryCheck 59 // is not set, then ShouldRetry will only be called if request.Retryable is nil. 60 // Proper handling of the request.Retryable field is important when setting this field. 61 EnforceShouldRetryCheck *bool 62 63 // The region to send requests to. This parameter is required and must 64 // be configured globally or on a per-client basis unless otherwise 65 // noted. A full list of regions is found in the "Regions and Endpoints" 66 // document. 67 // 68 // See http://docs.aws.amazon.com/general/latest/gr/rande.html for AWS 69 // Regions and Endpoints. 70 Region *string 71 72 // Set this to `true` to disable SSL when sending requests. Defaults 73 // to `false`. 74 DisableSSL *bool 75 76 // The HTTP client to use when sending requests. Defaults to 77 // `http.DefaultClient`. 78 HTTPClient *http.Client 79 80 // An integer value representing the logging level. The default log level 81 // is zero (LogOff), which represents no logging. To enable logging set 82 // to a LogLevel Value. 83 LogLevel *LogLevelType 84 85 // The logger writer interface to write logging messages to. Defaults to 86 // standard out. 87 Logger Logger 88 89 // The maximum number of times that a request will be retried for failures. 90 // Defaults to -1, which defers the max retry setting to the service 91 // specific configuration. 92 MaxRetries *int 93 94 // Retryer guides how HTTP requests should be retried in case of 95 // recoverable failures. 96 // 97 // When nil or the value does not implement the request.Retryer interface, 98 // the client.DefaultRetryer will be used. 99 // 100 // When both Retryer and MaxRetries are non-nil, the former is used and 101 // the latter ignored. 102 // 103 // To set the Retryer field in a type-safe manner and with chaining, use 104 // the request.WithRetryer helper function: 105 // 106 // cfg := request.WithRetryer(aws.NewConfig(), myRetryer) 107 // 108 Retryer RequestRetryer 109 110 // Disables semantic parameter validation, which validates input for 111 // missing required fields and/or other semantic request input errors. 112 DisableParamValidation *bool 113 114 // Disables the computation of request and response checksums, e.g., 115 // CRC32 checksums in Amazon DynamoDB. 116 DisableComputeChecksums *bool 117 118 // Set this to `true` to force the request to use path-style addressing, 119 // i.e., `http://s3.amazonaws.com/BUCKET/KEY`. By default, the S3 client 120 // will use virtual hosted bucket addressing when possible 121 // (`http://BUCKET.s3.amazonaws.com/KEY`). 122 // 123 // Note: This configuration option is specific to the Amazon S3 service. 124 // 125 // See http://docs.aws.amazon.com/AmazonS3/latest/dev/VirtualHosting.html 126 // for Amazon S3: Virtual Hosting of Buckets 127 S3ForcePathStyle *bool 128 129 // Set this to `true` to disable the SDK adding the `Expect: 100-Continue` 130 // header to PUT requests over 2MB of content. 100-Continue instructs the 131 // HTTP client not to send the body until the service responds with a 132 // `continue` status. This is useful to prevent sending the request body 133 // until after the request is authenticated, and validated. 134 // 135 // http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectPUT.html 136 // 137 // 100-Continue is only enabled for Go 1.6 and above. See `http.Transport`'s 138 // `ExpectContinueTimeout` for information on adjusting the continue wait 139 // timeout. https://golang.org/pkg/net/http/#Transport 140 // 141 // You should use this flag to disble 100-Continue if you experience issues 142 // with proxies or third party S3 compatible services. 143 S3Disable100Continue *bool 144 145 // Set this to `true` to enable S3 Accelerate feature. For all operations 146 // compatible with S3 Accelerate will use the accelerate endpoint for 147 // requests. Requests not compatible will fall back to normal S3 requests. 148 // 149 // The bucket must be enable for accelerate to be used with S3 client with 150 // accelerate enabled. If the bucket is not enabled for accelerate an error 151 // will be returned. The bucket name must be DNS compatible to also work 152 // with accelerate. 153 S3UseAccelerate *bool 154 155 // S3DisableContentMD5Validation config option is temporarily disabled, 156 // For S3 GetObject API calls, #1837. 157 // 158 // Set this to `true` to disable the S3 service client from automatically 159 // adding the ContentMD5 to S3 Object Put and Upload API calls. This option 160 // will also disable the SDK from performing object ContentMD5 validation 161 // on GetObject API calls. 162 S3DisableContentMD5Validation *bool 163 164 // Set this to `true` to disable the EC2Metadata client from overriding the 165 // default http.Client's Timeout. This is helpful if you do not want the 166 // EC2Metadata client to create a new http.Client. This options is only 167 // meaningful if you're not already using a custom HTTP client with the 168 // SDK. Enabled by default. 169 // 170 // Must be set and provided to the session.NewSession() in order to disable 171 // the EC2Metadata overriding the timeout for default credentials chain. 172 // 173 // Example: 174 // sess := session.Must(session.NewSession(aws.NewConfig() 175 // .WithEC2MetadataDiableTimeoutOverride(true))) 176 // 177 // svc := s3.New(sess) 178 // 179 EC2MetadataDisableTimeoutOverride *bool 180 181 // Instructs the endpoint to be generated for a service client to 182 // be the dual stack endpoint. The dual stack endpoint will support 183 // both IPv4 and IPv6 addressing. 184 // 185 // Setting this for a service which does not support dual stack will fail 186 // to make requets. It is not recommended to set this value on the session 187 // as it will apply to all service clients created with the session. Even 188 // services which don't support dual stack endpoints. 189 // 190 // If the Endpoint config value is also provided the UseDualStack flag 191 // will be ignored. 192 // 193 // Only supported with. 194 // 195 // sess := session.Must(session.NewSession()) 196 // 197 // svc := s3.New(sess, &aws.Config{ 198 // UseDualStack: aws.Bool(true), 199 // }) 200 UseDualStack *bool 201 202 // SleepDelay is an override for the func the SDK will call when sleeping 203 // during the lifecycle of a request. Specifically this will be used for 204 // request delays. This value should only be used for testing. To adjust 205 // the delay of a request see the aws/client.DefaultRetryer and 206 // aws/request.Retryer. 207 // 208 // SleepDelay will prevent any Context from being used for canceling retry 209 // delay of an API operation. It is recommended to not use SleepDelay at all 210 // and specify a Retryer instead. 211 SleepDelay func(time.Duration) 212 213 // DisableRestProtocolURICleaning will not clean the URL path when making rest protocol requests. 214 // Will default to false. This would only be used for empty directory names in s3 requests. 215 // 216 // Example: 217 // sess := session.Must(session.NewSession(&aws.Config{ 218 // DisableRestProtocolURICleaning: aws.Bool(true), 219 // })) 220 // 221 // svc := s3.New(sess) 222 // out, err := svc.GetObject(&s3.GetObjectInput { 223 // Bucket: aws.String("bucketname"), 224 // Key: aws.String("//foo//bar//moo"), 225 // }) 226 DisableRestProtocolURICleaning *bool 227 228 // EnableEndpointDiscovery will allow for endpoint discovery on operations that 229 // have the definition in its model. By default, endpoint discovery is off. 230 // 231 // Example: 232 // sess := session.Must(session.NewSession(&aws.Config{ 233 // EnableEndpointDiscovery: aws.Bool(true), 234 // })) 235 // 236 // svc := s3.New(sess) 237 // out, err := svc.GetObject(&s3.GetObjectInput { 238 // Bucket: aws.String("bucketname"), 239 // Key: aws.String("/foo/bar/moo"), 240 // }) 241 EnableEndpointDiscovery *bool 242 243 // DisableEndpointHostPrefix will disable the SDK's behavior of prefixing 244 // request endpoint hosts with modeled information. 245 // 246 // Disabling this feature is useful when you want to use local endpoints 247 // for testing that do not support the modeled host prefix pattern. 248 DisableEndpointHostPrefix *bool 249} 250 251// NewConfig returns a new Config pointer that can be chained with builder 252// methods to set multiple configuration values inline without using pointers. 253// 254// // Create Session with MaxRetry configuration to be shared by multiple 255// // service clients. 256// sess := session.Must(session.NewSession(aws.NewConfig(). 257// WithMaxRetries(3), 258// )) 259// 260// // Create S3 service client with a specific Region. 261// svc := s3.New(sess, aws.NewConfig(). 262// WithRegion("us-west-2"), 263// ) 264func NewConfig() *Config { 265 return &Config{} 266} 267 268// WithCredentialsChainVerboseErrors sets a config verbose errors boolean and returning 269// a Config pointer. 270func (c *Config) WithCredentialsChainVerboseErrors(verboseErrs bool) *Config { 271 c.CredentialsChainVerboseErrors = &verboseErrs 272 return c 273} 274 275// WithCredentials sets a config Credentials value returning a Config pointer 276// for chaining. 277func (c *Config) WithCredentials(creds *credentials.Credentials) *Config { 278 c.Credentials = creds 279 return c 280} 281 282// WithEndpoint sets a config Endpoint value returning a Config pointer for 283// chaining. 284func (c *Config) WithEndpoint(endpoint string) *Config { 285 c.Endpoint = &endpoint 286 return c 287} 288 289// WithEndpointResolver sets a config EndpointResolver value returning a 290// Config pointer for chaining. 291func (c *Config) WithEndpointResolver(resolver endpoints.Resolver) *Config { 292 c.EndpointResolver = resolver 293 return c 294} 295 296// WithRegion sets a config Region value returning a Config pointer for 297// chaining. 298func (c *Config) WithRegion(region string) *Config { 299 c.Region = ®ion 300 return c 301} 302 303// WithDisableSSL sets a config DisableSSL value returning a Config pointer 304// for chaining. 305func (c *Config) WithDisableSSL(disable bool) *Config { 306 c.DisableSSL = &disable 307 return c 308} 309 310// WithHTTPClient sets a config HTTPClient value returning a Config pointer 311// for chaining. 312func (c *Config) WithHTTPClient(client *http.Client) *Config { 313 c.HTTPClient = client 314 return c 315} 316 317// WithMaxRetries sets a config MaxRetries value returning a Config pointer 318// for chaining. 319func (c *Config) WithMaxRetries(max int) *Config { 320 c.MaxRetries = &max 321 return c 322} 323 324// WithDisableParamValidation sets a config DisableParamValidation value 325// returning a Config pointer for chaining. 326func (c *Config) WithDisableParamValidation(disable bool) *Config { 327 c.DisableParamValidation = &disable 328 return c 329} 330 331// WithDisableComputeChecksums sets a config DisableComputeChecksums value 332// returning a Config pointer for chaining. 333func (c *Config) WithDisableComputeChecksums(disable bool) *Config { 334 c.DisableComputeChecksums = &disable 335 return c 336} 337 338// WithLogLevel sets a config LogLevel value returning a Config pointer for 339// chaining. 340func (c *Config) WithLogLevel(level LogLevelType) *Config { 341 c.LogLevel = &level 342 return c 343} 344 345// WithLogger sets a config Logger value returning a Config pointer for 346// chaining. 347func (c *Config) WithLogger(logger Logger) *Config { 348 c.Logger = logger 349 return c 350} 351 352// WithS3ForcePathStyle sets a config S3ForcePathStyle value returning a Config 353// pointer for chaining. 354func (c *Config) WithS3ForcePathStyle(force bool) *Config { 355 c.S3ForcePathStyle = &force 356 return c 357} 358 359// WithS3Disable100Continue sets a config S3Disable100Continue value returning 360// a Config pointer for chaining. 361func (c *Config) WithS3Disable100Continue(disable bool) *Config { 362 c.S3Disable100Continue = &disable 363 return c 364} 365 366// WithS3UseAccelerate sets a config S3UseAccelerate value returning a Config 367// pointer for chaining. 368func (c *Config) WithS3UseAccelerate(enable bool) *Config { 369 c.S3UseAccelerate = &enable 370 return c 371 372} 373 374// WithS3DisableContentMD5Validation sets a config 375// S3DisableContentMD5Validation value returning a Config pointer for chaining. 376func (c *Config) WithS3DisableContentMD5Validation(enable bool) *Config { 377 c.S3DisableContentMD5Validation = &enable 378 return c 379 380} 381 382// WithUseDualStack sets a config UseDualStack value returning a Config 383// pointer for chaining. 384func (c *Config) WithUseDualStack(enable bool) *Config { 385 c.UseDualStack = &enable 386 return c 387} 388 389// WithEC2MetadataDisableTimeoutOverride sets a config EC2MetadataDisableTimeoutOverride value 390// returning a Config pointer for chaining. 391func (c *Config) WithEC2MetadataDisableTimeoutOverride(enable bool) *Config { 392 c.EC2MetadataDisableTimeoutOverride = &enable 393 return c 394} 395 396// WithSleepDelay overrides the function used to sleep while waiting for the 397// next retry. Defaults to time.Sleep. 398func (c *Config) WithSleepDelay(fn func(time.Duration)) *Config { 399 c.SleepDelay = fn 400 return c 401} 402 403// WithEndpointDiscovery will set whether or not to use endpoint discovery. 404func (c *Config) WithEndpointDiscovery(t bool) *Config { 405 c.EnableEndpointDiscovery = &t 406 return c 407} 408 409// WithDisableEndpointHostPrefix will set whether or not to use modeled host prefix 410// when making requests. 411func (c *Config) WithDisableEndpointHostPrefix(t bool) *Config { 412 c.DisableEndpointHostPrefix = &t 413 return c 414} 415 416// MergeIn merges the passed in configs into the existing config object. 417func (c *Config) MergeIn(cfgs ...*Config) { 418 for _, other := range cfgs { 419 mergeInConfig(c, other) 420 } 421} 422 423func mergeInConfig(dst *Config, other *Config) { 424 if other == nil { 425 return 426 } 427 428 if other.CredentialsChainVerboseErrors != nil { 429 dst.CredentialsChainVerboseErrors = other.CredentialsChainVerboseErrors 430 } 431 432 if other.Credentials != nil { 433 dst.Credentials = other.Credentials 434 } 435 436 if other.Endpoint != nil { 437 dst.Endpoint = other.Endpoint 438 } 439 440 if other.EndpointResolver != nil { 441 dst.EndpointResolver = other.EndpointResolver 442 } 443 444 if other.Region != nil { 445 dst.Region = other.Region 446 } 447 448 if other.DisableSSL != nil { 449 dst.DisableSSL = other.DisableSSL 450 } 451 452 if other.HTTPClient != nil { 453 dst.HTTPClient = other.HTTPClient 454 } 455 456 if other.LogLevel != nil { 457 dst.LogLevel = other.LogLevel 458 } 459 460 if other.Logger != nil { 461 dst.Logger = other.Logger 462 } 463 464 if other.MaxRetries != nil { 465 dst.MaxRetries = other.MaxRetries 466 } 467 468 if other.Retryer != nil { 469 dst.Retryer = other.Retryer 470 } 471 472 if other.DisableParamValidation != nil { 473 dst.DisableParamValidation = other.DisableParamValidation 474 } 475 476 if other.DisableComputeChecksums != nil { 477 dst.DisableComputeChecksums = other.DisableComputeChecksums 478 } 479 480 if other.S3ForcePathStyle != nil { 481 dst.S3ForcePathStyle = other.S3ForcePathStyle 482 } 483 484 if other.S3Disable100Continue != nil { 485 dst.S3Disable100Continue = other.S3Disable100Continue 486 } 487 488 if other.S3UseAccelerate != nil { 489 dst.S3UseAccelerate = other.S3UseAccelerate 490 } 491 492 if other.S3DisableContentMD5Validation != nil { 493 dst.S3DisableContentMD5Validation = other.S3DisableContentMD5Validation 494 } 495 496 if other.UseDualStack != nil { 497 dst.UseDualStack = other.UseDualStack 498 } 499 500 if other.EC2MetadataDisableTimeoutOverride != nil { 501 dst.EC2MetadataDisableTimeoutOverride = other.EC2MetadataDisableTimeoutOverride 502 } 503 504 if other.SleepDelay != nil { 505 dst.SleepDelay = other.SleepDelay 506 } 507 508 if other.DisableRestProtocolURICleaning != nil { 509 dst.DisableRestProtocolURICleaning = other.DisableRestProtocolURICleaning 510 } 511 512 if other.EnforceShouldRetryCheck != nil { 513 dst.EnforceShouldRetryCheck = other.EnforceShouldRetryCheck 514 } 515 516 if other.EnableEndpointDiscovery != nil { 517 dst.EnableEndpointDiscovery = other.EnableEndpointDiscovery 518 } 519 520 if other.DisableEndpointHostPrefix != nil { 521 dst.DisableEndpointHostPrefix = other.DisableEndpointHostPrefix 522 } 523} 524 525// Copy will return a shallow copy of the Config object. If any additional 526// configurations are provided they will be merged into the new config returned. 527func (c *Config) Copy(cfgs ...*Config) *Config { 528 dst := &Config{} 529 dst.MergeIn(c) 530 531 for _, cfg := range cfgs { 532 dst.MergeIn(cfg) 533 } 534 535 return dst 536} 537