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Chapter 31. AWS S3 Storage Service Component
Available as of Camel version 2.8
The S3 component supports storing and retrieving objetcs from/to Amazon’s S3 service.
Prerequisites
You must have a valid Amazon Web Services developer account, and be signed up to use Amazon S3. More information are available at Amazon S3.
31.1. URI Format
aws-s3://bucketNameOrArn[?options]
The bucket will be created if it don’t already exists.
You can append query options to the URI in the following format, ?options=value&option2=value&…
For example in order to read file hello.txt from bucket helloBucket, use the following snippet:
from("aws-s3:helloBucket?accessKey=yourAccessKey&secretKey=yourSecretKey&prefix=hello.txt")
.to("file:/var/downloaded");31.2. URI Options
The AWS S3 Storage Service component supports 5 options which are listed below.
| Name | Description | Default | Type |
|---|---|---|---|
| configuration (advanced) | The AWS S3 default configuration | S3Configuration | |
| accessKey (common) | Amazon AWS Access Key | String | |
| secretKey (common) | Amazon AWS Secret Key | String | |
| region (common) | The region where the bucket is located. This option is used in the com.amazonaws.services.s3.model.CreateBucketRequest. | String | |
| resolveProperty Placeholders (advanced) | Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders. | true | boolean |
The AWS S3 Storage Service endpoint is configured using URI syntax:
aws-s3:bucketNameOrArn
with the following path and query parameters:
31.2.1. Path Parameters (1 parameters):
| Name | Description | Default | Type |
|---|---|---|---|
| bucketNameOrArn | Required Bucket name or ARN | String |
31.2.2. Query Parameters (50 parameters):
| Name | Description | Default | Type |
|---|---|---|---|
| amazonS3Client (common) | Reference to a com.amazonaws.services.sqs.AmazonS3 in the link:registry.htmlRegistry. | AmazonS3 | |
| pathStyleAccess (common) | Whether or not the S3 client should use path style access | false | boolean |
| policy (common) | The policy for this queue to set in the com.amazonaws.services.s3.AmazonS3setBucketPolicy() method. | String | |
| proxyHost (common) | To define a proxy host when instantiating the SQS client | String | |
| proxyPort (common) | Specify a proxy port to be used inside the client definition. | Integer | |
| region (common) | The region in which S3 client needs to work | String | |
| useIAMCredentials (common) | Set whether the S3 client should expect to load credentials on an EC2 instance or to expect static credentials to be passed in. | false | boolean |
| encryptionMaterials (common) | The encryption materials to use in case of Symmetric/Asymmetric client usage | EncryptionMaterials | |
| useEncryption (common) | Define if encryption must be used or not | false | boolean |
| bridgeErrorHandler (consumer) | Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored. | false | boolean |
| deleteAfterRead (consumer) | Delete objects from S3 after they have been retrieved. The delete is only performed if the Exchange is committed. If a rollback occurs, the object is not deleted. If this option is false, then the same objects will be retrieve over and over again on the polls. Therefore you need to use the Idempotent Consumer EIP in the route to filter out duplicates. You can filter using the link S3ConstantsBUCKET_NAME and link S3ConstantsKEY headers, or only the link S3ConstantsKEY header. | true | boolean |
| fileName (consumer) | To get the object from the bucket with the given file name | String | |
| includeBody (consumer) | If it is true, the exchange body will be set to a stream to the contents of the file. If false, the headers will be set with the S3 object metadata, but the body will be null. This option is strongly related to autocloseBody option. In case of setting includeBody to true and autocloseBody to false, it will be up to the caller to close the S3Object stream. Setting autocloseBody to true, will close the S3Object stream automatically. | true | boolean |
| maxConnections (consumer) | Set the maxConnections parameter in the S3 client configuration | 60 | int |
| maxMessagesPerPoll (consumer) | Gets the maximum number of messages as a limit to poll at each polling. Is default unlimited, but use 0 or negative number to disable it as unlimited. | 10 | int |
| prefix (consumer) | The prefix which is used in the com.amazonaws.services.s3.model.ListObjectsRequest to only consume objects we are interested in. | String | |
| sendEmptyMessageWhenIdle (consumer) | If the polling consumer did not poll any files, you can enable this option to send an empty message (no body) instead. | false | boolean |
| autocloseBody (consumer) | If this option is true and includeBody is true, then the S3Object.close() method will be called on exchange completion. This option is strongly related to includeBody option. In case of setting includeBody to true and autocloseBody to false, it will be up to the caller to close the S3Object stream. Setting autocloseBody to true, will close the S3Object stream automatically. | true | boolean |
| exceptionHandler (consumer) | To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this options is not in use. By default the consumer will deal with exceptions, that will be logged at WARN or ERROR level and ignored. | ExceptionHandler | |
| exchangePattern (consumer) | Sets the exchange pattern when the consumer creates an exchange. | ExchangePattern | |
| pollStrategy (consumer) | A pluggable org.apache.camel.PollingConsumerPollingStrategy allowing you to provide your custom implementation to control error handling usually occurred during the poll operation before an Exchange have been created and being routed in Camel. | PollingConsumerPoll Strategy | |
| deleteAfterWrite (producer) | Delete file object after the S3 file has been uploaded | false | boolean |
| multiPartUpload (producer) | If it is true, camel will upload the file with multi part format, the part size is decided by the option of partSize | false | boolean |
| operation (producer) | The operation to do in case the user don’t want to do only an upload | S3Operations | |
| partSize (producer) | Setup the partSize which is used in multi part upload, the default size is 25M. | 26214400 | long |
| serverSideEncryption (producer) | Sets the server-side encryption algorithm when encrypting the object using AWS-managed keys. For example use AES256. | String | |
| storageClass (producer) | The storage class to set in the com.amazonaws.services.s3.model.PutObjectRequest request. | String | |
| awsKMSKeyId (producer) | Define the id of KMS key to use in case KMS is enabled | String | |
| useAwsKMS (producer) | Define if KMS must be used or not | false | boolean |
| synchronous (advanced) | Sets whether synchronous processing should be strictly used, or Camel is allowed to use asynchronous processing (if supported). | false | boolean |
| accelerateModeEnabled ( advanced) | Define if Accelerate Mode enabled is true or false | false | boolean |
| chunkedEncodingDisabled ( advanced) | Define if disabled Chunked Encoding is true or false | false | boolean |
| dualstackEnabled ( advanced) | Define if Dualstack enabled is true or false | false | boolean |
| forceGlobalBucketAccess Enabled ( advanced) | Define if Force Global Bucket Access enabled is true or false | false | boolean |
| payloadSigningEnabled ( advanced) | Define if Payload Signing enabled is true or false | false | boolean |
| backoffErrorThreshold (scheduler) | The number of subsequent error polls (failed due some error) that should happen before the backoffMultipler should kick-in. | int | |
| backoffIdleThreshold (scheduler) | The number of subsequent idle polls that should happen before the backoffMultipler should kick-in. | int | |
| backoffMultiplier (scheduler) | To let the scheduled polling consumer backoff if there has been a number of subsequent idles/errors in a row. The multiplier is then the number of polls that will be skipped before the next actual attempt is happening again. When this option is in use then backoffIdleThreshold and/or backoffErrorThreshold must also be configured. | int | |
| delay (scheduler) | Milliseconds before the next poll. You can also specify time values using units, such as 60s (60 seconds), 5m30s (5 minutes and 30 seconds), and 1h (1 hour). | 500 | long |
| greedy (scheduler) | If greedy is enabled, then the ScheduledPollConsumer will run immediately again, if the previous run polled 1 or more messages. | false | boolean |
| initialDelay (scheduler) | Milliseconds before the first poll starts. You can also specify time values using units, such as 60s (60 seconds), 5m30s (5 minutes and 30 seconds), and 1h (1 hour). | 1000 | long |
| runLoggingLevel (scheduler) | The consumer logs a start/complete log line when it polls. This option allows you to configure the logging level for that. | TRACE | LoggingLevel |
| scheduledExecutorService (scheduler) | Allows for configuring a custom/shared thread pool to use for the consumer. By default each consumer has its own single threaded thread pool. | ScheduledExecutor Service | |
| scheduler (scheduler) | To use a cron scheduler from either camel-spring or camel-quartz2 component | none | ScheduledPollConsumer Scheduler |
| schedulerProperties (scheduler) | To configure additional properties when using a custom scheduler or any of the Quartz2, Spring based scheduler. | Map | |
| startScheduler (scheduler) | Whether the scheduler should be auto started. | true | boolean |
| timeUnit (scheduler) | Time unit for initialDelay and delay options. | MILLISECONDS | TimeUnit |
| useFixedDelay (scheduler) | Controls if fixed delay or fixed rate is used. See ScheduledExecutorService in JDK for details. | true | boolean |
| accessKey (security) | Amazon AWS Access Key | String | |
| secretKey (security) | Amazon AWS Secret Key | String |
Required S3 component options
You have to provide the amazonS3Client in the Registry or your accessKey and secretKey to access the Amazon’s S3.
31.3. Batch Consumer
This component implements the Batch Consumer.
This allows you for instance to know how many messages exists in this batch and for instance let the Aggregator aggregate this number of messages.
31.4. Usage
31.4.1. Message headers evaluated by the S3 producer
| Header | Type | Description |
|---|---|---|
|
|
| The bucket Name which this object will be stored or which will be used for the current operation |
|
|
| Camel 2.18: The bucket Destination Name which will be used for the current operation |
|
|
| The content length of this object. |
|
|
| The content type of this object. |
|
|
| Camel 2.8.2: The content control of this object. |
|
|
| Camel 2.8.2: The content disposition of this object. |
|
|
| Camel 2.8.2: The content encoding of this object. |
|
|
| Camel 2.8.2: The md5 checksum of this object. |
|
|
| Camel 2.18:The Destination key which will be used for the current operation |
|
|
| The key under which this object will be stored or which will be used for the current operation |
|
|
| Camel 2.8.2: The last modified timestamp of this object. |
|
|
| Camel 2.18: The operation to perform. Permitted values are copyObject, listBuckets, deleteBucket, downloadLink |
|
|
| Camel 2.8.4: The storage class of this object. |
|
|
|
Camel 2.11.0: The canned acl that will be applied to the object. see |
|
|
|
Camel 2.11.0: a well constructed Amazon S3 Access Control List object. see |
|
|
| Camel 2.15.0: support to get or set custom objectMetadata headers. |
|
| String | Camel 2.16: Sets the server-side encryption algorithm when encrypting the object using AWS-managed keys. For example use AES256. |
|
|
| The version Id of the object to be stored or returned from the current operation |
31.4.2. Message headers set by the S3 producer
| Header | Type | Description |
|---|---|---|
|
|
| The ETag value for the newly uploaded object. |
|
|
| The optional version ID of the newly uploaded object. |
|
|
| The expiration (millis) of URL download link. The link will be stored into CamelAwsS3DownloadLink response header. |
31.4.3. Message headers set by the S3 consumer
| Header | Type | Description |
|---|---|---|
|
|
| The key under which this object is stored. |
|
|
| The name of the bucket in which this object is contained. |
|
|
| The hex encoded 128-bit MD5 digest of the associated object according to RFC 1864. This data is used as an integrity check to verify that the data received by the caller is the same data that was sent by Amazon S3. |
|
|
| The value of the Last-Modified header, indicating the date and time at which Amazon S3 last recorded a modification to the associated object. |
|
|
| The version ID of the associated Amazon S3 object if available. Version IDs are only assigned to objects when an object is uploaded to an Amazon S3 bucket that has object versioning enabled. |
|
|
| The Content-Type HTTP header, which indicates the type of content stored in the associated object. The value of this header is a standard MIME type. |
|
|
| The base64 encoded 128-bit MD5 digest of the associated object (content - not including headers) according to RFC 1864. This data is used as a message integrity check to verify that the data received by Amazon S3 is the same data that the caller sent. |
|
|
| The Content-Length HTTP header indicating the size of the associated object in bytes. |
|
|
| The optional Content-Encoding HTTP header specifying what content encodings have been applied to the object and what decoding mechanisms must be applied in order to obtain the media-type referenced by the Content-Type field. |
|
|
| The optional Content-Disposition HTTP header, which specifies presentational information such as the recommended filename for the object to be saved as. |
|
|
| The optional Cache-Control HTTP header which allows the user to specify caching behavior along the HTTP request/reply chain. |
|
| String | Camel 2.16: The server-side encryption algorithm when encrypting the object using AWS-managed keys. |
31.4.4. Advanced AmazonS3 configuration
If your Camel Application is running behind a firewall or if you need to have more control over the AmazonS3 instance configuration, you can create your own instance:
AWSCredentials awsCredentials = new BasicAWSCredentials("myAccessKey", "mySecretKey");
ClientConfiguration clientConfiguration = new ClientConfiguration();
clientConfiguration.setProxyHost("http://myProxyHost");
clientConfiguration.setProxyPort(8080);
AmazonS3 client = new AmazonS3Client(awsCredentials, clientConfiguration);
registry.bind("client", client);and refer to it in your Camel aws-s3 component configuration:
from("aws-s3://MyBucket?amazonS3Client=#client&delay=5000&maxMessagesPerPoll=5")
.to("mock:result");31.4.5. Use KMS with the S3 component
To use AWS KMS to encrypt/decrypt data by using AWS infrastructure you can use the options introduced in 2.21.x like in the following example
from("file:tmp/test?fileName=test.txt")
.setHeader(S3Constants.KEY, constant("testFile"))
.to("aws-s3://mybucket?amazonS3Client=#client&useAwsKMS=true&awsKMSKeyId=3f0637ad-296a-3dfe-a796-e60654fb128c");In this way you’ll ask to S3, to use the KMS key 3f0637ad-296a-3dfe-a796-e60654fb128c, to encrypt the file test.txt. When you’ll ask to download this file, the decryption will be done directly before the download.
31.4.6. Use "useIAMCredentials" with the s3 component
To use AWS IAM credentials, you must first verify that the EC2 in which you are launching the Camel application on has an IAM role associated with it containing the appropriate policies attached to run effectively. Keep in mind that this feature should only be set to "true" on remote instances. To clarify even further, you must still use static credentials locally since IAM is an AWS specific component, but AWS environments should now be easier to manage. After this is implemented and understood, you can set the query parameter "useIAMCredentials" to "true" for AWS environments! To effectively toggle this on and off based on local and remote environments, you can consider enabling this query parameter with system environment variables. For example, your code could set the "useIAMCredentials" query parameter to "true", when the system environment variable called "isRemote" is set to true (there are many other ways to do this and this should act as a simple example). Although it doesn’t take away the need for static credentials completely, using IAM credentials on AWS environments takes away the need to refresh on remote environments and adds a major security boost (IAM credentials are refreshed automatically every 6 hours and update when their policies are updated). This is the AWS recommended way to manage credentials and therefore should be used as often as possible.
31.5. Dependencies
Maven users will need to add the following dependency to their pom.xml.
pom.xml
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-aws</artifactId>
<version>${camel-version}</version>
</dependency>
where ${camel-version} must be replaced by the actual version of Camel (2.8 or higher).
31.6. See Also
- Configuring Camel
- Component
- Endpoint
- Getting Started
- AWS Component
