wasm-cdt

justitita wasm contract development kit

Getting started

Running it then should be as simple as:

$ make all

Testing

$ make test

Build Docker Image

We use docker so that wasm-cdt command can run on any type system. You can compile from the source code or directly use pre-build binary to build docker image.

1. Make build directory, structure:

    -\
      -llvm\
      -misc\
      -Dockerfile
      -wasm-cdt
   

   llvm: llvm binary files

   misc: base header files

   Dockerfile: Docker build file

   wasm-cdt: go build binary file.

2. Start Building：

    $ docker build -t wasm-cdt .
    $ docker run –rm -it wasm-cdt --help (verify your image)
   

Write Wasm Contract

1. For your C file must have invoke method, and invoke is the only entry point of the contract. invoke method format:

   $ char *invoke(int argc, char *argv[])
   

2. You can use justitia.h in your contract to get info relate to chain:

   #include <stdio.h>
   #include <string.h>
   #include "justitia.h"
   

3. demo.c is our demo contract, you get some detail to write wasm contract.

4. To deploy a contract, you can use our deploy command.

   docker run --rm -it -v ${local_workspace}:/workspace wasm-cdt deploy -f ${wasm_file} -ac ${deploy_account} -ep ${endpoint_address}
   

5. To call wasm contract, you can use our rpc api wasm-call and wasm-transaction.