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[ aws . qldb ]

get-block

Description

Returns a block object at a specified address in a journal. Also returns a proof of the specified block for verification if DigestTipAddress is provided.

For information about the data contents in a block, see Journal contents in the Amazon QLDB Developer Guide .

If the specified ledger doesn't exist or is in DELETING status, then throws ResourceNotFoundException .

If the specified ledger is in CREATING status, then throws ResourcePreconditionNotMetException .

If no block exists with the specified address, then throws InvalidParameterException .

See also: AWS API Documentation

Synopsis

  get-block
--name <value>
--block-address <value>
[--digest-tip-address <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]
[--debug]
[--endpoint-url <value>]
[--no-verify-ssl]
[--no-paginate]
[--output <value>]
[--query <value>]
[--profile <value>]
[--region <value>]
[--version <value>]
[--color <value>]
[--no-sign-request]
[--ca-bundle <value>]
[--cli-read-timeout <value>]
[--cli-connect-timeout <value>]

Options

--name (string)

The name of the ledger.

--block-address (structure)

The location of the block that you want to request. An address is an Amazon Ion structure that has two fields: strandId and sequenceNo .

For example: {strandId:"BlFTjlSXze9BIh1KOszcE3",sequenceNo:14} .

IonText -> (string)

An Amazon Ion plaintext value contained in a ValueHolder structure.

Shorthand Syntax:

IonText=string

JSON Syntax:

{
  "IonText": "string"
}

--digest-tip-address (structure)

The latest block location covered by the digest for which to request a proof. An address is an Amazon Ion structure that has two fields: strandId and sequenceNo .

For example: {strandId:"BlFTjlSXze9BIh1KOszcE3",sequenceNo:49} .

IonText -> (string)

An Amazon Ion plaintext value contained in a ValueHolder structure.

Shorthand Syntax:

IonText=string

JSON Syntax:

{
  "IonText": "string"
}

--cli-input-json (string) Performs service operation based on the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, the CLI values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

Global Options

--debug (boolean)

Turn on debug logging.

--endpoint-url (string)

Override command's default URL with the given URL.

--no-verify-ssl (boolean)

By default, the AWS CLI uses SSL when communicating with AWS services. For each SSL connection, the AWS CLI will verify SSL certificates. This option overrides the default behavior of verifying SSL certificates.

--no-paginate (boolean)

Disable automatic pagination.

--output (string)

The formatting style for command output.

  • json
  • text
  • table

--query (string)

A JMESPath query to use in filtering the response data.

--profile (string)

Use a specific profile from your credential file.

--region (string)

The region to use. Overrides config/env settings.

--version (string)

Display the version of this tool.

--color (string)

Turn on/off color output.

  • on
  • off
  • auto

--no-sign-request (boolean)

Do not sign requests. Credentials will not be loaded if this argument is provided.

--ca-bundle (string)

The CA certificate bundle to use when verifying SSL certificates. Overrides config/env settings.

--cli-read-timeout (int)

The maximum socket read time in seconds. If the value is set to 0, the socket read will be blocking and not timeout. The default value is 60 seconds.

--cli-connect-timeout (int)

The maximum socket connect time in seconds. If the value is set to 0, the socket connect will be blocking and not timeout. The default value is 60 seconds.

Examples

Note

To use the following examples, you must have the AWS CLI installed and configured. See the Getting started guide in the AWS CLI User Guide for more information.

Unless otherwise stated, all examples have unix-like quotation rules. These examples will need to be adapted to your terminal's quoting rules. See Using quotation marks with strings in the AWS CLI User Guide .

Example 1: To get a journal block and proof for verification using input files

The following get-block example requests a block data object and a proof from the specified ledger. The request is for a specified digest tip address and block address.

aws qldb get-block \
    --name vehicle-registration \
    --block-address file://myblockaddress.json \
    --digest-tip-address file://mydigesttipaddress.json

Contents of myblockaddress.json:

{
    "IonText": "{strandId:\"KmA3ZZca7vAIiJAK9S5Iwl\",sequenceNo:100}"
}

Contents of mydigesttipaddress.json:

{
    "IonText": "{strandId:\"KmA3ZZca7vAIiJAK9S5Iwl\",sequenceNo:123}"
}

Output:

{
    "Block": {
        "IonText": "{blockAddress:{strandId:\"KmA3ZZca7vAIiJAK9S5Iwl\",sequenceNo:100},transactionId:\"FnQeJBAicTX0Ah32ZnVtSX\",blockTimestamp:2019-09-16T19:37:05.360Z,blockHash:{{NoChM92yKRuJAb/jeLd1VnYn4DHiWIf071ACfic9uHc=}},entriesHash:{{l05LOsiKV14SDbuaYnH7uwXzUvqzIwUiRLXGbTyj/nY=}},previousBlockHash:{{7kewBXhpdbClcZKxhVmpoMHpUGOJtWQD0iY2LPfZkYA=}},entriesHashList:[{{eRSwnmAM7WWANWDd5iGOyK+T4tDXyzUq6HZ/0fgLHos=}},{{mHVex/yjHAWjFPpwhBuH2GKXmKJjK2FBa9faqoUVNtg=}},{{y5cCBr7pOAIUfsVQ1j0TqtE97b4b4oo1R0vnYyE5wWM=}},{{TvTXygML1bMe6NvEZtGkX+KR+W/EJl4qD1mmV77KZQg=}}],transactionInfo:{statements:[{statement:\"FROM VehicleRegistration AS r \\nWHERE r.VIN = '1N4AL11D75C109151'\\nINSERT INTO r.Owners.SecondaryOwners\\n    VALUE { 'PersonId' : 'CMVdR77XP8zAglmmFDGTvt' }\",startTime:2019-09-16T19:37:05.302Z,statementDigest:{{jcgPX2vsOJ0waum4qmDYtn1pCAT9xKNIzA+2k4R+mxA=}}}],documents:{JUJgkIcNbhS2goq8RqLuZ4:{tableName:\"VehicleRegistration\",tableId:\"BFJKdXgzt9oF4wjMbuxy4G\",statements:[0]}}},revisions:[{blockAddress:{strandId:\"KmA3ZZca7vAIiJAK9S5Iwl\",sequenceNo:100},hash:{{mHVex/yjHAWjFPpwhBuH2GKXmKJjK2FBa9faqoUVNtg=}},data:{VIN:\"1N4AL11D75C109151\",LicensePlateNumber:\"LEWISR261LL\",State:\"WA\",PendingPenaltyTicketAmount:90.25,ValidFromDate:2017-08-21,ValidToDate:2020-05-11,Owners:{PrimaryOwner:{PersonId:\"BFJKdXhnLRT27sXBnojNGW\"},SecondaryOwners:[{PersonId:\"CMVdR77XP8zAglmmFDGTvt\"}]},City:\"Everett\"},metadata:{id:\"JUJgkIcNbhS2goq8RqLuZ4\",version:3,txTime:2019-09-16T19:37:05.344Z,txId:\"FnQeJBAicTX0Ah32ZnVtSX\"}}]}"
    },
    "Proof": {
        "IonText": "[{{l3+EXs69K1+rehlqyWLkt+oHDlw4Zi9pCLW/t/mgTPM=}},{{48CXG3ehPqsxCYd34EEa8Fso0ORpWWAO8010RJKf3Do=}},{{9UnwnKSQT0i3ge1JMVa+tMIqCEDaOPTkWxmyHSn8UPQ=}},{{3nW6Vryghk+7pd6wFCtLufgPM6qXHyTNeCb1sCwcDaI=}},{{Irb5fNhBrNEQ1VPhzlnGT/ZQPadSmgfdtMYcwkNOxoI=}},{{+3CWpYG/ytf/vq9GidpzSx6JJiLXt1hMQWNnqOy3jfY=}},{{NPx6cRhwsiy5m9UEWS5JTJrZoUdO2jBOAAOmyZAT+qE=}}]"
    }
}

For more information, see Data Verification in Amazon QLDB in the Amazon QLDB Developer Guide.

Example 2: To get a journal block and proof for verification using shorthand syntax

The following get-block example requests a block data object and a proof from the specified ledger using shorthand syntax. The request is for a specified digest tip address and block address.

aws qldb get-block \
    --name vehicle-registration \
    --block-address 'IonText="{strandId:\"KmA3ZZca7vAIiJAK9S5Iwl\",sequenceNo:100}"' \
    --digest-tip-address 'IonText="{strandId:\"KmA3ZZca7vAIiJAK9S5Iwl\",sequenceNo:123}"'

Output:

{
    "Block": {
        "IonText": "{blockAddress:{strandId:\"KmA3ZZca7vAIiJAK9S5Iwl\",sequenceNo:100},transactionId:\"FnQeJBAicTX0Ah32ZnVtSX\",blockTimestamp:2019-09-16T19:37:05.360Z,blockHash:{{NoChM92yKRuJAb/jeLd1VnYn4DHiWIf071ACfic9uHc=}},entriesHash:{{l05LOsiKV14SDbuaYnH7uwXzUvqzIwUiRLXGbTyj/nY=}},previousBlockHash:{{7kewBXhpdbClcZKxhVmpoMHpUGOJtWQD0iY2LPfZkYA=}},entriesHashList:[{{eRSwnmAM7WWANWDd5iGOyK+T4tDXyzUq6HZ/0fgLHos=}},{{mHVex/yjHAWjFPpwhBuH2GKXmKJjK2FBa9faqoUVNtg=}},{{y5cCBr7pOAIUfsVQ1j0TqtE97b4b4oo1R0vnYyE5wWM=}},{{TvTXygML1bMe6NvEZtGkX+KR+W/EJl4qD1mmV77KZQg=}}],transactionInfo:{statements:[{statement:\"FROM VehicleRegistration AS r \\nWHERE r.VIN = '1N4AL11D75C109151'\\nINSERT INTO r.Owners.SecondaryOwners\\n    VALUE { 'PersonId' : 'CMVdR77XP8zAglmmFDGTvt' }\",startTime:2019-09-16T19:37:05.302Z,statementDigest:{{jcgPX2vsOJ0waum4qmDYtn1pCAT9xKNIzA+2k4R+mxA=}}}],documents:{JUJgkIcNbhS2goq8RqLuZ4:{tableName:\"VehicleRegistration\",tableId:\"BFJKdXgzt9oF4wjMbuxy4G\",statements:[0]}}},revisions:[{blockAddress:{strandId:\"KmA3ZZca7vAIiJAK9S5Iwl\",sequenceNo:100},hash:{{mHVex/yjHAWjFPpwhBuH2GKXmKJjK2FBa9faqoUVNtg=}},data:{VIN:\"1N4AL11D75C109151\",LicensePlateNumber:\"LEWISR261LL\",State:\"WA\",PendingPenaltyTicketAmount:90.25,ValidFromDate:2017-08-21,ValidToDate:2020-05-11,Owners:{PrimaryOwner:{PersonId:\"BFJKdXhnLRT27sXBnojNGW\"},SecondaryOwners:[{PersonId:\"CMVdR77XP8zAglmmFDGTvt\"}]},City:\"Everett\"},metadata:{id:\"JUJgkIcNbhS2goq8RqLuZ4\",version:3,txTime:2019-09-16T19:37:05.344Z,txId:\"FnQeJBAicTX0Ah32ZnVtSX\"}}]}"
    },
    "Proof": {
        "IonText": "[{{l3+EXs69K1+rehlqyWLkt+oHDlw4Zi9pCLW/t/mgTPM=}},{{48CXG3ehPqsxCYd34EEa8Fso0ORpWWAO8010RJKf3Do=}},{{9UnwnKSQT0i3ge1JMVa+tMIqCEDaOPTkWxmyHSn8UPQ=}},{{3nW6Vryghk+7pd6wFCtLufgPM6qXHyTNeCb1sCwcDaI=}},{{Irb5fNhBrNEQ1VPhzlnGT/ZQPadSmgfdtMYcwkNOxoI=}},{{+3CWpYG/ytf/vq9GidpzSx6JJiLXt1hMQWNnqOy3jfY=}},{{NPx6cRhwsiy5m9UEWS5JTJrZoUdO2jBOAAOmyZAT+qE=}}]"
    }
}

For more information, see Data Verification in Amazon QLDB in the Amazon QLDB Developer Guide.

Output

Block -> (structure)

The block data object in Amazon Ion format.

IonText -> (string)

An Amazon Ion plaintext value contained in a ValueHolder structure.

Proof -> (structure)

The proof object in Amazon Ion format returned by a GetBlock request. A proof contains the list of hash values required to recalculate the specified digest using a Merkle tree, starting with the specified block.

IonText -> (string)

An Amazon Ion plaintext value contained in a ValueHolder structure.