Sending transactions and queries

Writing Contracts Building Clients Github
Search…
Using Gamma CLI
Transactions are different from read-only queries by the fact they're able to change state. Transactions require consensus by several nodes whereas read-only queries can rely on a single node.
Send transactions to contracts by running gamma-cli send-tx and giving a JSON file containing the call arguments.
For example, to send the transaction with arguments in transfer.json
1
gamma-cli send-tx transfer.json -signer user1
Copied!
Perform queries and call read-only contract methods by running gamma-cli run-query and giving a similar JSON file.
For example, to make the read call with arguments in get-balance.json
1
gamma-cli run-query get-balance.json -signer user1
Copied!
Command parameters
1
gamma-cli send-tx <INPUT_FILE> -arg# [OVERRIDE_ARG_#] -signer [ID_FROM_KEYS_JSON]
Copied!
1
gamma-cli run-query <INPUT_FILE> -arg# [OVERRIDE_ARG_#] -signer [ID_FROM_KEYS_JSON]
Copied!
<INPUT_FILE> Path of the JSON file containing the call arguments
-signer Account ID of the signer of the call (from orbs-test-keys.json)
-arg# Override the value of argument number # from the input call argument JSON
Call argument JSON
This simple JSON file is used to let Gamma CLI know which contract method should be executed and what arguments should be passed to it.
An example of such a JSON is
1
{
2
  "ContractName": "CounterExample",
3
  "MethodName": "add",
4
  "Arguments": [
5
    {
6
      "Type": "uint64",
7
      "Value": "25"
8
    }
9
  ]
10
}
Copied!
The ContractName should be the name chosen during deployment of the contract with gamma-cli deploy. The method name should be one of the exported methods found in the contract source code.
The array of arguments should be given according to the declaration of the method in contract source code.
Supported argument types
uint32 - Integer with 32 bit precision. Matches the uint32 type in Go contracts. Provided in the JSON as a string of a decimal number. For example
1
  {
2
    "Type": "uint32",
3
    "Value": "25"
4
  }
Copied!
uint64 - Integer with 64 bit precision. Matches the uint64 type in Go contracts. Provided in the JSON as a string of a decimal number. For example
1
  {
2
    "Type": "uint64",
3
    "Value": "10029999"
4
  }
Copied!
string - String. Matches the string type in Go contracts. Provided in the JSON as a UTF8 string. For example
1
  {
2
    "Type": "string",
3
    "Value": "Hello world"
4
  }
Copied!
bytes - An array of bytes (blob). Matches the []byte type in Go contracts. Provided in the JSON as a hex string. For example
1
  {
2
    "Type": "bytes",
3
    "Value": "0x00ff018e00ab2fe901"
4
  }
Copied!
bool - boolean value. Matches the bool type in Go contracts. Provided in the JSON as a string with value "0" or "1". For example
1
  {
2
    "Type": "bool",
3
    "Value": "1"
4
  }
Copied!
uint256 - Integer with 256 bit precision. Matches the *big.Int type in Go contracts. Provided in the JSON as a hex string with fixed size of 64 hexes. For example
1
  {
2
    "Type": "uint256",
3
    "Value": "0x00112233445566778899aabbccddeeff00112233445566778899aabbccddeeff"
4
  }
Copied!
bytes20 - A fixed size array of 20 bytes. Matches the [20]byte type in Go contracts. Provided in the JSON as a hex string with fixed size of 40 hexes. For example
1
  {
2
    "Type": "bytes20",
3
    "Value": "0x0011223344556677889900112233445566778899"
4
  }
Copied!
bytes32 - A fixed size array of 32 bytes. Matches the [32]byte type in Go contracts. Provided in the JSON as a hex string with fixed size of 64 hexes. For example
1
  {
2
    "Type": "bytes32",
3
    "Value": "0x00112233445566778899aabbccddeeff00112233445566778899aabbccddeeff"
4
  }
Copied!
All the slice of these types are also supported. The type has the suffix 'Array' and the value is JSON Array of strings representing the values. For example
1
  {
2
    "Type": "uint64Array",
3
    "Value": [
4
      "10029999",
5
      "1997",
6
      "12345678"
7
    ]
8
  },
9
  {
10
    "Type": "bytes20Array",
11
    "Value": [
12
      "0x0011223344556677889900112233445566778899",
13
      "0x0000000000000000000000111111111111111111"
14
    ]
15
  }
Copied!
In addition to these primitives, Gamma CLI supports several aliases for convenience:
gamma:keys-file-address - An account address by ID. The value should be an account ID from orbs-test-keys.json. An alias for the type bytes which means it matches the []byte type in Go contracts. Used to pass the account address in raw form.
1
  {
2
    "Type": "gamma:keys-file-address",
3
    "Value": "user3"
4
  }
Copied!
Overriding arguments from command line
Consider a JSON for a typical transfer method
transfer-15.json
1
{
2
  "ContractName": "MyToken",
3
  "MethodName": "transfer",

4
  "Arguments": [
5
    {
6
      "Type": "uint64",
7
      "Value": "15"
8
    },
9
    {
10
      "Type": "bytes",
11
      "Value": "b3d1caa2b3680e2c8feffa269c207c553fbbc828"
12
    }
13
  ]
14
}
Copied!
The first argument is the amount and the second argument is the recipient address.
If you want to send multiple transactions with different amounts or different addresses, creating multiple JSON files containing the different values can be a hassle.
Instead, use the optional -arg1 and -arg2 command line arguments to override values
1
gamma-cli send-tx transfer-15.json
Copied!
           will send 15 tokens to recipient b3d1caa2b3680e2c8feffa269c207c553fbbc828
1
gamma-cli send-tx transfer-15.json -arg1 22
Copied!
           will send 22 tokens to recipient b3d1caa2b3680e2c8feffa269c207c553fbbc828
1
gamma-cli send-tx transfer-15.json -arg2 7ccd7f7c18c0cb749dd8b8949f4b4e31f7188394
Copied!
           will send 15 tokens to recipient 7ccd7f7c18c0cb749dd8b8949f4b4e31f7188394
When the type is an Array (slice) should be a STRINGIFIED JSON representation for example if the type is a boolArray the override value can be something like this :
"[\"0\", \"1\", \"1\"] - this is a string representation of []bool{false, true, true}
Gamma in Depth - Previous
Deploying smart contracts
Next - Gamma in Depth
Checking sent transaction status
Last modified 2yr ago
Copy link
Contents
Using Gamma CLI
Command parameters
Call argument JSON
Supported argument types
Overriding arguments from command line