go-delegator

Metadium Proxy

Main functions are MetaID CRUD and relaying JSON-RPC result with metadium nodes.

Contents

• Features
• Prerequisite
• Build
• Test
• Usage
• Deploy (for AWS Lambda)
• Reference
• License

Features

1. JSON-RPC relay with metadium nodes
2. Proofs for sign and merkle tree such as Ecrecover, DeriveSha, VerifyProof

Prerequisite

1. Go
   • Install at https://golang.org/doc/install
2. Dep
   • Install

   brew install dep
   

3. Docker
   • Install at https://docs.docker.com/install
4. xgo
   • because of compilation for C code used in go-ethereum, we need improved cross-compiler

docker pull karalabe/xgo-latest
go get github.com/karalabe/xgo

Build

1. Move to root directory of this repo
2. Build on your preference

• In case of Lambda that is cross-compile, make or make lambda

• In case of Lambda with remote branch, make branch=master remote

• In case of compile for local machine, make local

Test

1. Move each module directory such as json, rpc and so on
2. Run testunit

   go test -v
   

Usage

1. $> proxy [KEY_JSON_PATH] -log_lev=debug -log_out=/log/proxy.log -log_fmt=json
2. $> proxy [KEY_JSON_PATH] [KEY_JSON_PASSPHRASE] -log_lev=debug -log_out=/log/proxy.log -log_fmt=json
   • log_lev, log_out, log_fmt, log_bot_token and log_bot_chatid are optional
   • description:
     • log_lev: log level
     • log_out: log output location
     • log_fmt: log format, text or JSON
     • log_bot_token: telegram access token
     • log_bot_chatid: telegram chat ID
   • default:
     • log_lev: info
     • log_out: stdout
     • log_fmt: text

Deploy (for AWS Lambda)

1. Set Lambda on AWS
   • Function package: compressed binary file in $GOPATH/src/{repo}/bin
   • Handler: proxy (binary file name, it is optional)
   • Runtime: Go 1.x
   • (Optional) Include DynamoDB execution role to Lambda execution role
2. Set API Gateway as proxy on AWS
3. Add API Gateway as Lambda trigger
4. Add CloudWatch Logs

Reference

[1] AWS Lambda Go, https://github.com/aws/aws-lambda-go

[2] Go ethereum, https://github.com/ethereum/go-ethereum

[3] IPFS, https://ipfs.io/

[4] IPFS API, https://github.com/ipfs/go-ipfs-api

[5] Cross compiling for ethereum, https://github.com/ethereum/go-ethereum/wiki/Cross-compiling-Ethereum

[6] Xgo, https://github.com/karalabe/xgo

[7] Dep, https://github.com/golang/dep

License

MIT