Blob

Kubemq blob target connector allows services using kubemq server to access blob messaging services.

Prerequisites

The following are required to run the blob target connector:

• kubemq cluster

• Azure active storage account

• Azure active with storage enable - with access account

• kubemq-targets deployment

Configuration

blob target connector configuration properties:

Properties Key	Required	Description	Example
storage_account	yes	azure storage account name	"my_account"
storage_access_key	yes	azure storage access key	"abcd1234"
policy	no	azure blob retry policy	"retry_policy_exponential",retry_policy_fixed(default retry_policy_fixed)
max_tries	no	try at most x times to perform the operation	"3" default (1)
try_timeout	no	Maximum time allowed for any single try (Millisecond)	"600"default (1000)
retry_delay	no	Backoff amount for each retry (Millisecond)	"60" default (60)
max_retry_delay	no	Max delay between retries (Millisecond)	"180"default (180

Example:

bindings:
  - name: kubemq-query-azure-blob
    source:
      kind: kubemq.query
      name: kubemq-query
      properties:
        address: "kubemq-cluster:50000"
        client_id: "kubemq-query-azure-blob-connector"
        auth_token: ""
        channel: "azure.storage.blob"
        group:   ""
        concurrency: "1"
        auto_reconnect: "true"
        reconnect_interval_seconds: "1"
        max_reconnects: "0"
    target:
      kind: azure.storage.blob
      name: azure-storage-blob
      properties:
        storage_account: "id"
        storage_access_key: "key"

Usage

Upload

Upload metadata setting:

Metadata Key	Required	Description	Possible values
method	yes	type of method	"upload"
file_name	yes	the name to upload the file under	"myfile.txt"
service_url	yes	service url path	"https://test.blob.core.windows.net/test"
data	yes	file data (byte array)	"bXktZmlsZS1kYXRh"
block_size	no	specifies the block size to use	"0" ,default(azblob.BlockBlobMaxStageBlockBytes)
parallelism	no	maximum number of blocks to upload in parallel	"upload",default(0)
blob_metadata	no	Key value string string of blob_metadata	"{"tag":"test","name":"myname"}"

Example:

{
  "metadata": {
    "method": "upload",
    "file_name": "myfile.txt",
    "service_url": "https://test.end.point.test.net/test"
  },
  "data": "bXktZmlsZS1kYXRh"
}

Delete

Delete metadata setting:

Metadata Key	Required	Description	Possible values
method	yes	type of method	"delete"
file_name	yes	the name of the file to delete	"myfile.txt"
service_url	yes	service url path	"https://test.blob.core.windows.net/test"
delete_snapshots_option_type	no	type of method	"only","include","" (default "")

Example:

{
  "metadata": {
    "method": "delete",
    "file_name": "myfile.txt",
    "service_url": "https://test.end.point.test.net/test"
  },
  "data": null
}

get

For more information, see https://docs.microsoft.com/rest/api/storageservices/get-blob get metadata setting:

Metadata Key	Required	Description	Possible values
method	yes	type of method	"get"
file_name	yes	the name of the file to get	"myfile.txt"
service_url	yes	service url path	"https://test.blob.core.windows.net/test"
max_retry_request	no	type of method	"20" (default "1")
count	no	number of files to get	"20" (will get all from offset)
offset	no	start reading blob from offset	"20" (will start from the first byte in blob)

Example:

{
  "metadata": {
    "method": "get",
    "file_name": "myfile.txt",
    "service_url": "https://test.end.point.test.net/test"
  },
  "data": null
}