benjiewheeler / eos-go

EOS.IO Go API library

EOS.IO API library for Go

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This library provides simple access to data structures (binary packing and JSON interface) and API calls to an EOS.IO RPC server, running remotely or locally. It provides wallet functionalities (KeyBag), or can sign transaction through the keosd wallet. It also knows about the P2P protocol on port 9876.

As of before the June launch, this library is pretty much in flux. Don't expect stability, as we're moving alongside the main eosio codebase, which changes very fast.

This library is the basis for the eos-bios launch orchestrator tool at https://github.com/eoscanada/eos-bios

Basic usage

package main

import (
	"context"
	"encoding/json"
	"fmt"

	eos "github.com/eoscanada/eos-go"
	cli "github.com/streamingfast/cli"
)

func main() {
	api := eos.New("https://api.eosn.io")
	ctx := context.Background()

	infoResp, err := api.GetInfo(ctx)
	cli.NoError(err, "unable to get chain info")

	fmt.Println("Chain Info", toJson(infoResp))

	accountResp, _ := api.GetAccount(ctx, "eosio")
	fmt.Println("Account Info", toJson(accountResp))
}

func toJson(v interface{}) string {
	out, err := json.MarshalIndent(v, "", "  ")
	cli.NoError(err, "unable to marshal json")

	return string(out)
}

Examples

Reference

• API
  • Get Account
  • Get Chain Information
  • Get Producers
  • Transfer Token
• Decoding/Encoding
  • Decode Table Row
• Transaction
  • Transaction Sign & Pack
  • Transaction Unpack

Running

The easiest way to see the actual output for a given example is to add a line // Output: any at the very end of the test, looks like this for ExampleAPI_GetInfo file (examples_api_get_info.go):

	...

    fmt.Println(string(bytes))
    // Output: any
}

This tells go test that it can execute this test correctly. Then, simply run only this example:

go test -run ExampleAPI_GetInfo

Replacing ExampleAPI_GetInfo with the actual example name you want to try out where line // Output: any was added.

This will run the example and compares the standard output with the any which will fail. But it's ok an expected, so you can see the actual output printed to your terminal.

Note Some examples will not succeed out of the box because it requires some configuration. A good example being the transfer operation which requires having the authorizations and balance necessary to perform the transaction. It's quite possible to run them through a development environment however.

Binaries

There is some binaries in main packages under cmd/, mainly around P2P communication.

Environment Variables

All examples uses by default the https://api.eosn.io API endpoint for all HTTP communication and peering.eosn.io for P2P communication. They can respectively be overridden by specifying environment variable EOS_GO_API_URL and EOS_GO_P2P_ENDPOINT respectively.

Tests

Some of our tests renders dates in the timezone of the OS. As such, if you have a bunch of failures around dates and times, it's probably because your timezone is not aligned with those in the tests.

Run the tests with this to be in the same timezone as the expected one in golden files:

TZ=UTC go test ./...

Release

We are using Goreleaser to perform releases. Install the goreleaser binary (instructions) and follow these steps:

• Dry run release process first with goreleaser release --skip-publish --skip-validate --rm-dist
• Publish draft release with goreleaser release --rm-dist
• Open GitHub's release and check that the release is all good
• Once everything is good, publish release, this will now also push the tag.

Contributing

Any contributions are welcome, use your standard GitHub-fu to pitch in and improve.

License

MIT