Data Storage

Some read (non-transaction) methods are static and can be accessed without creating an instance of Datum. All blockchain write actions require a Datum instance initialized with a private key. Learn more about initializing the Datum instance here

initialize

With minimal configuration

datum.initialize({
    identity : identity.keystore
});

With all configuration options set

datum.initialize({
    identity : identity.keystore,
    developerPublicKey : identityDeveloper.publicKey,
    network : "https://node-5.megatron.datum.org/api",
    useFuelingServer: true
});

Initialize the datum instance with given configurations

Parameters

1. Object - Configuration object with at least a keystore set

other options:

defaultPublicKeys - public keys, if set it will be added to access control list for every item stored

network - the Datum Blockchain HTTP endpoint that is used, if not specified, it will be auto-selected

storage - the preferred storage endpoint that should be used to store the data. If not set, it will be auto-selected.

useFuelingServer - to use fueling server

Returns

None

set

set('ANY DATA', "MY_DATA", "UNKNOWN_CATEGORY", "ANY METADATA", 1, 1, 30, false);

Store data with or without key name

Parameters

1. Object|String - Object or String of the data. If the data is an object, it will be stringified.
2. String - The key name that's used for this data, default empty
3. String - The category this data belongs to , default empty
4. String - The metadata about this data, default empty
5. Number - The requested replicationMode/Count for this Data, default = 1 (hold at least 1 replication)
6. Number - The requested privacy level for this data , default = 1 (all nodes can store this data)
7. Number - Amount of days the data should be stored at least, default = 30
8. Number - Amount to deposit in DAT, default = 0

Returns

Promise with additional events to capture

Example

set('ANY DATA', "MY_DATA", "UNKNOWN_CATEGORY", "ANY METADATA", 1, 1, 30 );

get

get('0xb57f5f92f8931e044f59d54f7f2a445e5dd274e16599f104a61a8dd4cfa5b0fa');

Downloads the data with given id/hash

Parameters

1. String - Id/hash of the data

Returns

Promise with decrypted content of the data

Example

get('0xb57f5f92f8931e044f59d54f7f2a445e5dd274e16599f104a61a8dd4cfa5b0fa');

getWithKey

getWithKey('User_Profiles');

Downloads the latest version data with given keyname

Parameters

1. String - keyname of the data

Returns

Promise with decrypted content of the data

Example

getWithKey('User_Profiles');

getIds static

//static
Datum.getIds("0x6e585cc6047a55a793d1E922afE28BaefaBcd73C");

Get all data id's/hashes for given addess

Parameters

1. String - wallet address

Returns

Promise with an array of data id's

Example

getIds("0x6e585cc6047a55a793d1E922afE28BaefaBcd73C");

getIdsForKey static

//static
Datum.getIdsForKey('0x6e585cc6047a55a793d1E922afE28BaefaBcd73C', 'PROFILE_DATA');

Get all data id's/hashes behind the given keyname of the wallet address.

Parameters

1. String - wallet address
2. String - name of the key

Returns

Promise with an array of data id's

Example

getIdsForKey('PROFILE_DATA');

getItem static

//static
Datum.getItem("0x90ff892e2a2eb89a072cdee59e475dee18f3c1407b4d7bfcfe31dbda84fcabaa");

Get item struct stored in blockchain

Parameters

1. String - id/hash

Returns

Promise with an object of data

Example

getItem("0x90ff892e2a2eb89a072cdee59e475dee18f3c1407b4d7bfcfe31dbda84fcabaa");

getLastIdForKey static

//static
Datum.getLastIdForKey("0x6e585cc6047a55a793d1E922afE28BaefaBcd73C", "Profiles");

Get last version for data id's/hashes

Parameters

1. String - wallet address
2. String - key name

Returns

Promise with an array of data id's

Example

getLastIdForKey("0x6e585cc6047a55a793d1E922afE28BaefaBcd73C","Profiles");

getLockedBalance static

//statis
Datum.getLockedBalance();

Returns the locked balance in storage contract items

Parameters

none

Returns

Promise with amount of DAT's in wei

Example

getLockedBalance();

getLockedBalanceForId static

//statis
Datum.getLockedBalanceForId('0x48104eb1eb10ddf99670aff8d2e702104773fce00d9cb67ac41169541df4884a');

Returns the locked balance in storage contract for given id/hash

Parameters

none

Returns

Promise with amount of DAT's in wei

Example

getLockedBalanceForId('0x48104eb1eb10ddf99670aff8d2e702104773fce00d9cb67ac41169541df4884a');

getStorageCosts static

//static
Datum.getStorageCosts(100000, 30);

Returns the calculated storage costs for given size and duration

Parameters

1. Number - amount of bytes that you wanna store
2. Number - amount of days that you wanna store the data

Returns

Promise with costs amount of DAT's in wei

Example

getStorageCosts(100000, 30);

getTrafficCostsGB static

//static
Datum.getTrafficCostsGB(10);

Returns the calculated traffic costs for given volumen

Parameters

1. Number - amount of GB expected

Returns

Promise with costs amount of DAT's in wei

Example

getTrafficCostsGB(10);

remove

remove('0xb57f5f92f8931e044f59d54f7f2a445e5dd274e16599f104a61a8dd4cfa5b0fa');
// return { "status": "ok" } by promise

Removes the id/hash from storage space

Parameters

1. String - id/hash of the data

Returns

Promise with transaction result

Example

remove('0xb57f5f92f8931e044f59d54f7f2a445e5dd274e16599f104a61a8dd4cfa5b0fa');

removeByKey

removeByKey('USER_PROFILES');
// return { "status": "ok" } by promise

Removes the key from storage space

Parameters

1. String - key name

Returns

Promise with transaction result

Example

removeByKey('USER_PROFILES');

canAccess static

//static
Datum.canAccess("0xb6e0a22171b5ce8d1031a81f33e521222038db3da6123a6ab0ff19252dde97e4","0x6e585cc6047a55a793d1E922afE28BaefaBcd73C");

Validates if given wallet has access to id/hash

Returns

Promise with true|false

Example

canAccess("0xb6e0a22171b5ce8d1031a81f33e521222038db3da6123a6ab0ff19252dde97e4","0x6e585cc6047a55a793d1E922afE28BaefaBcd73C");

addPublicKeyForData

addPublicKeyForData('0xb57f5f92f8931e044f59d54f7f2a445e5dd274e16599f104a61a8dd4cfa5b0fa', 'f8cea1b3b439b00215e01e8bfae70c1b2ab09e8b339b9e824f2689df650dda52db7b51afe944b37cb068b1d32de36253275f6f94ba5e11a1ceb501674beafc75');

Add third-party public key to the access list for this data

Parameters

1. String - Id/hash of the data
2. String - Public key (not wallet) of the 3rd party you wanna add

Returns

Promise with transaction result

Example

addPublicKeyForData('0xb57f5f92f8931e044f59d54f7f2a445e5dd274e16599f104a61a8dd4cfa5b0fa', 'f8cea1b3b439b00215e01e8bfae70c1b2ab09e8b339b9e824f2689df650dda52db7b51afe944b37cb068b1d32de36253275f6f94ba5e11a1ceb501674beafc75');

addPublicKeyForDataByKey

addPublicKeyForDataByKey('PROFILE_DATA', 'f8cea1b3b439b00215e01e8bfae70c1b2ab09e8b339b9e824f2689df650dda52db7b51afe944b37cb068b1d32de36253275f6f94ba5e11a1ceb501674beafc75');

Add third-party public key to the access list for this keyname

Parameters

1. String - Keyname of the data
2. String - Public key of the 3rd party you wanna add

Returns

Promise with transaction result

Example

addPublicKeyForDataByKey('PROFILE_DATA', 'f8cea1b3b439b00215e01e8bfae70c1b2ab09e8b339b9e824f2689df650dda52db7b51afe944b37cb068b1d32de36253275f6f94ba5e11a1ceb501674beafc75');

removePublicKeyForData

removePublicKeyForData('0xb57f5f92f8931e044f59d54f7f2a445e5dd274e16599f104a61a8dd4cfa5b0fa', '0x6e585cc6047a55a793d1E922afE28BaefaBcd73C');

Removes third-party wallet from the access list for this data

Parameters

1. String - Id/hash of the data
2. String - Wallet address

Returns

Promise with transaction result

Example

removePublicKeyForData('0xb57f5f92f8931e044f59d54f7f2a445e5dd274e16599f104a61a8dd4cfa5b0fa', '0x6e585cc6047a55a793d1E922afE28BaefaBcd73C');