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docs: add generate-wrapper explainer

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Roman Khimov 2022-10-27 22:17:59 +03:00
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@ -410,6 +410,30 @@ given RPC server and wallet and paying 0.00001 extra GAS for this transaction):
$ ./bin/neo-go contract invokefunction -r http://localhost:20331 -w my_wallet.json -g 0.00001 f84d6a337fbc3d3a201d41da99e86b479e7a2554 balanceOf AK2nJJpJr6o664CWJKi1QRXjqeic2zRp8y
```
### Generating contract bindings
To be able to use deployed contract from another contract one needs to have
its interface definition (exported methods and hash). While it is possible to
use generic contract.Call interop interface, it's not very convenient and
efficient. NeoGo can autogenerate contract bindings in Go language for any
deployed contract based on its manifest, it creates a Go source file with all
of the contract's methods that then can be imported and used as a regular Go
package.
```
$ ./bin/neo-go contract generate-wrapper --manifest manifest.json --out wrapper.go --hash 0x1b4357bff5a01bdf2a6581247cf9ed1e24629176
```
Notice that some structured types can be omitted this way (when a function
returns some structure it's just an "Array" type in the manifest with no
internal details), but if the contract you're using is written in Go
originally you can create a specific configuration file during compilation
that will add this data for wrapper generator to use:
```
$ ./bin/neo-go contract compile -i contract.go --config contract.yml -o contract.nef --manifest manifest.json --bindings contract.bindings.yml
$ ./bin/neo-go contract generate-wrapper --manifest manifest.json --config contract.bindings.yml --out wrapper.go --hash 0x1b4357bff5a01bdf2a6581247cf9ed1e24629176
```
## Smart contract examples
Some examples are provided in the [examples directory](../examples). For more