azure_blob_storage

BETA

This component is mostly stable but breaking changes could still be made outside of major version releases if a fundamental problem with the component is found.

Downloads objects within an Azure Blob Storage container, optionally filtered by a prefix.

Introduced in version 3.36.0.

Common

# Common config fields, showing default values
input:
  label: ""
  azure_blob_storage:
    storage_account: ""
    storage_access_key: ""
    storage_connection_string: ""
    storage_sas_token: ""
    container: "" # No default (required)
    prefix: ""
    codec: all-bytes

Advanced

# All config fields, showing default values
input:
  label: ""
  azure_blob_storage:
    storage_account: ""
    storage_access_key: ""
    storage_connection_string: ""
    storage_sas_token: ""
    container: "" # No default (required)
    prefix: ""
    codec: all-bytes
    delete_objects: false

Supports multiple authentication methods but only one of the following is required:

• storage_connection_string
• storage_account and storage_access_key
• storage_account and storage_sas_token
• storage_account to access via DefaultAzureCredential

If multiple are set then the storage_connection_string is given priority.

If the storage_connection_string does not contain the AccountName parameter, please specify it in the storage_account field.

Downloading Large Files

When downloading large files it's often necessary to process it in streamed parts in order to avoid loading the entire file in memory at a given time. In order to do this a codec can be specified that determines how to break the input into smaller individual messages.

Metadata

This input adds the following metadata fields to each message:

- blob_storage_key
- blob_storage_container
- blob_storage_last_modified
- blob_storage_last_modified_unix
- blob_storage_content_type
- blob_storage_content_encoding
- All user defined metadata

You can access these metadata fields using function interpolation.

Fields

storage_account

The storage account to access. This field is ignored if storage_connection_string is set.

Type: string
Default: ""

storage_access_key

The storage account access key. This field is ignored if storage_connection_string is set.

Type: string
Default: ""

storage_connection_string

A storage account connection string. This field is required if storage_account and storage_access_key / storage_sas_token are not set.

Type: string
Default: ""

storage_sas_token

The storage account SAS token. This field is ignored if storage_connection_string or storage_access_key are set.

Type: string
Default: ""

container

The name of the container from which to download blobs.

Type: string

prefix

An optional path prefix, if set only objects with the prefix are consumed.

Type: string
Default: ""

codec

The way in which the bytes of a data source should be converted into discrete messages, codecs are useful for specifying how large files or continuous streams of data might be processed in small chunks rather than loading it all in memory. It's possible to consume lines using a custom delimiter with the delim:x codec, where x is the character sequence custom delimiter. Codecs can be chained with /, for example a gzip compressed CSV file can be consumed with the codec gzip/csv.

Type: string
Default: "all-bytes"

Option	Summary
auto	EXPERIMENTAL: Attempts to derive a codec for each file based on information such as the extension. For example, a .tar.gz file would be consumed with the gzip/tar codec. Defaults to all-bytes.
all-bytes	Consume the entire file as a single binary message.
avro-ocf:marshaler=x	EXPERIMENTAL: Consume a stream of Avro OCF datum. The marshaler parameter is optional and has the options: goavro (default), json. Use goavro if OCF contains logical types.
chunker:x	Consume the file in chunks of a given number of bytes.
csv	Consume structured rows as comma separated values, the first row must be a header row.
csv:x	Consume structured rows as values separated by a custom delimiter, the first row must be a header row. The custom delimiter must be a single character, e.g. the codec "csv:\t" would consume a tab delimited file.
csv-safe	Consume structured rows like csv, but sends messages with empty maps on failure to parse. Includes row number and parsing errors (if any) in the message's metadata.
csv-safe:x	Consume structured rows like csv:x as values separated by a custom delimiter, but sends messages with empty maps on failure to parse. The custom delimiter must be a single character, e.g. the codec "csv-safe:\t" would consume a tab delimited file. Includes row number and parsing errors (if any) in the message's metadata.
delim:x	Consume the file in segments divided by a custom delimiter.
gzip	Decompress a gzip file, this codec should precede another codec, e.g. gzip/all-bytes, gzip/tar, gzip/csv, etc.
pgzip	Decompress a gzip file in parallel, this codec should precede another codec, e.g. pgzip/all-bytes, pgzip/tar, pgzip/csv, etc.
lines	Consume the file in segments divided by linebreaks.
multipart	Consumes the output of another codec and batches messages together. A batch ends when an empty message is consumed. For example, the codec lines/multipart could be used to consume multipart messages where an empty line indicates the end of each batch.
regex:(?m)^\d\d:\d\d:\d\d	Consume the file in segments divided by regular expression.
skipbom	Skip one or more byte order marks for each opened reader, this codec should precede another codec, e.g. skipbom/csv, etc.
tar	Parse the file as a tar archive, and consume each file of the archive as a message.

# Examples

codec: lines

codec: "delim:\t"

codec: delim:foobar

codec: gzip/csv

delete_objects

Whether to delete downloaded objects from the blob once they are processed.

Type: bool
Default: false