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An enterprise-grade Java-based, Apache 2.0 licensed Ethereum client https://wiki.hyperledger.org/display/besu
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112 lines
5.0 KiB
112 lines
5.0 KiB
description: Creating and sending private transactions
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# Creating and Sending Private Transactions
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The [EEA JavaScript library](https://github.com/PegaSysEng/eeajs) is provided to create and send signed
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RLP-encoded private transactions.
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!!! note
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Private transactions either deploy contracts or call contract functions.
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Ether transfer transactions cannot be private.
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The [EEAJS library README](https://github.com/PegaSysEng/eeajs/blob/master/README.md) describes how to use
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the provided examples with the [Privacy Quickstart](https://github.com/PegaSysEng/pantheon-quickstart/tree/master/privacy).
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## Using Multinode Example
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To use the examples provided in EEA JS library with [your privacy network](Configuring-Privacy.md):
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1. Clone the **PegaSysEng/eeajs** repository:
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```bash
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git clone https://github.com/PegaSysEng/eeajs.git
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```
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1. In the `eeajs` directory:
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```bash
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npm install
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```
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1. In the `example` directory, update the `keys.js` file to include:
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* Orion node public keys
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* Pantheon node RPC URLs
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* Pantheon node private keys
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1. If the `chainID` specified in the genesis file for your network is not `2018`, update `deployContract.js`,
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`storeValueFromNode1.js`, and `storeValueFromNode2.js` to specify your chain ID instead of `2018`.
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1. In the `example/multiNodeExample` directory, deploy the contract:
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```bash
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node deployContract.js
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```
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A private transaction receipt is returned.
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```
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Transaction Hash 0x23b57ddc3ecf9c9a548e4401a411420ffc0002fd259a86d5656add7c6108beeb
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Waiting for transaction to be mined ...
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Private Transaction Receipt
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{ contractAddress: '0xfee84481da8f4b9a998dfacb38091b3145bb01ab',
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from: '0x9811ebc35d7b06b3fa8dc5809a1f9c52751e1deb',
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to: null,
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output:
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'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',
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logs: [] }
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```
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1. Copy the contract address from the private transaction receipt and set the `CONTRACT_ADDRESS` environment variable:
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```bash
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export CONTRACT_ADDRESS=<Contract Address from Private Transaction Receipt>
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```
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!!! example
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```bash
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export CONTRACT_ADDRESS=0xfee84481da8f4b9a998dfacb38091b3145bb01ab
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```
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1. Store a value in the contract from Node 1:
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```bash
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node storeValueFromNode1.js
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```
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The value of 1000 (3e8 in hex) is stored by Node 1 and is visible to Node 1 and Node 2.
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```bash
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Transaction Hash: 0xd9d71cc6f64675e1a48183ded8f08930af317eb883ebae4c4eec66ae68618d85
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Waiting for transaction to be mined ...
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Event Emited: 0x0000000000000000000000009811ebc35d7b06b3fa8dc5809a1f9c52751e1deb00000000000000000000000000000000000000000000000000000000000003e8
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Waiting for transaction to be mined ...
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Get Value from http://localhost:8545: 0x00000000000000000000000000000000000000000000000000000000000003e8
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Waiting for transaction to be mined ...
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Get Value from http://localhost:8546: 0x00000000000000000000000000000000000000000000000000000000000003e8
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Waiting for transaction to be mined ...
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Get Value from http://localhost:8547: 0x
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```
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7. Store a value in the contract from Node 2:
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```bash
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node storeValueFromNode2.js
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```
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The value of 42 (2a in hex) is stored by Node 1 and is visible to Node 1 and Node 2.
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```bash
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Transaction Hash: 0xa025433aec47a71b0230f12f43708812fd38ff7b7c1dc89a715f71dcbd5fbdbf
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Waiting for transaction to be mined ...
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Event Emited: 0x000000000000000000000000372a70ace72b02cc7f1757183f98c620254f9c8d000000000000000000000000000000000000000000000000000000000000002a
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Waiting for transaction to be mined ...
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Get Value from http://localhost:8545: 0x000000000000000000000000000000000000000000000000000000000000002a
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Waiting for transaction to be mined ...
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Get Value from http://localhost:8546: 0x000000000000000000000000000000000000000000000000000000000000002a
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Waiting for transaction to be mined ...
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Get Value from http://localhost:8547: 0x
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```
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!!! note
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The Node 3 Orion log messages indicate payloads cannot be found. This is expected behaviour
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because Node 3 does not have access to the private transactions between Node 1 and Node 2.
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