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59 lines
4.2 KiB
Markdown
59 lines
4.2 KiB
Markdown
# NEO-GO smart contract examples
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`examples` directory contains smart contract examples written in Go.
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These examples are aimed to demonstrate the basic usage of Go programming
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language to write NEO smart contracts as far as to provide a brief introduction
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to the NEO-specific interop package application.
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## Examples structure
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Each example represents a separate folder with the smart contract content inside.
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The content is presented by the smart contract code written in Go and the smart
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contract configuration file with `.yml` extension.
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Some contracts have a contract owner, which is needed for witness checking and
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represented by the `owner` string constant inside the smart contract code. The
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owner account address is taken from the [my_wallet.json](my_wallet.json). The
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wallet is located under the `examples` directory, has a single account inside
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with the `my_account` label which can be decrypted with the `qwerty` password.
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You can use `my_wallet.json` to deploy example contracts.
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See the table below for the detailed examples description.
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| Example | Description |
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| --- | --- |
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| [engine](engine) | This contract demonstrates how to use `runtime` interop package which implements an API for `System.Runtime.*` NEO system calls. Please, refer to the `runtime` [package documentation](../pkg/interop/doc.go) for details. |
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| [events](events) | The contract shows how execution notifications with the different arguments types can be sent with the help of `runtime.Notify` function of the `runtime` interop package. Please, refer to the `runtime.Notify` [function documentation](../pkg/interop/runtime/runtime.go) for details. |
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| [iterator](iterator) | This example describes a way to work with NEO iterators. Please, refer to the `iterator` [package documentation](../pkg/interop/iterator/iterator.go) for details. |
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| [nft-nd](nft-nd) | NEP-11 non-divisible NFT. See NEP-11 token standard [specification](https://github.com/neo-project/proposals/pull/130) for details. |
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| [oracle](oracle) | Oracle demo contract exposing two methods that you can use to process URLs. It uses oracle native contract, see [interop package documentation](../pkg/interop/native/oracle/oracle.go) also. |
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| [runtime](runtime) | This contract demonstrates how to use special `_initialize` and `_deploy` methods. See the [compiler documentation](../docs/compiler.md#vm-api-interop-layer ) for methods details. It also shows the pattern for checking owner witness inside the contract with the help of `runtime.CheckWitness` interop [function](../pkg/interop/runtime/runtime.go). |
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| [storage](storage) | The contract implements API for basic operations with a contract storage. It shows hos to use `storage` interop package. See the `storage` [package documentation](../pkg/interop/storage/storage.go). |
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| [timer](timer) | The idea of the contract is to count `tick` method invocations and destroy itself after the third invocation. It shows how to use `contract.Call` interop function to call, update (migrate) and destroy the contract. Please, refer to the `contract.Call` [function documentation](../pkg/interop/contract/contract.go) |
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| [token](token) | This contract implements NEP17 token standard (like NEO and GAS tokens) with all required methods and operations. See the NEP17 token standard [specification](https://github.com/neo-project/proposals/pull/126) for details. |
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| [token-sale](token-sale) | The contract represents a token with `allowance`. It means that the token owner should approve token withdrawing before the transfer. The contract demonstrates how interop packages can be combined to work together. |
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## Compile
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Please, refer to the neo-go
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[smart contract compiler documentation](../docs/compiler.md) to compile example
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smart contracts.
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## Deploy
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You can set up neo-go private network to deploy the example contracts. Please,
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refer to the [consensus documentation](../docs/consensus.md) to start your own
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privnet with neo-go nodes.
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To deploy smart contracts, refer to the
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[Deploying section](../docs/compiler.md#deploying) of the compiler documentation.
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## Where to start
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Feel free to explore neo-go smart contract development
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[workshop](https://github.com/nspcc-dev/neo-go-sc-wrkshp) to get the basic
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concepts of how to develop, compile, debug and deploy NEO smart contracts written
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in go.
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