init pr

Author: opaolini

.gitignore

@@ -0,0 +1 @@
+rpc-gateway

Dockerfile

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+FROM golang:1.17-alpine3.13 as builder
+
+RUN apk update && apk add git build-base
+
+WORKDIR /src
+
+ADD . ./
+
+RUN go build
+
+# final image
+FROM alpine:3.13
+
+RUN apk update && apk add ca-certificates --no-cache
+
+RUN mkdir -p /app
+    
+COPY --from=builder /src/rpc-gateway /app/rpc-gateway
+
+USER app
+VOLUME ["/app"]
+CMD ["/app/rpc-gateway"]

config.go

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+package main
+
+import (
+	"net/url"
+	"time"
+)
+
+type MetricsConfig struct {
+	Port string `yaml:"port"`
+}
+
+type ProxyConfig struct {
+	Port                    string        `yaml:"port"`
+	AllowedNumberOfRetries  uint          `yaml:"allowedNumberOfRetries"`
+	AllowedNumberOfAttempts uint          `yaml:"allowedNumberOfAttempts"`
+	RetryDelay              time.Duration `yaml:"retryDelay"`
+	UpstreamTimeout         time.Duration `yaml:"upstreamTimeout"`
+}
+
+type HealthCheckConfig struct {
+	Interval         time.Duration `yaml:"interval"`
+	Timeout          time.Duration `yaml:"timeout"`
+	FailureThreshold uint          `yaml:"failureThreshold"`
+	SuccessThreshold uint          `yaml:"successThreshold"`
+}
+
+type TargetConnectionHTTP struct {
+	URL         string `yaml:"url"`
+	Compression bool   `yaml:"compression"`
+}
+
+type TargetConfigConnection struct {
+	HTTP TargetConnectionHTTP `yaml:"http"`
+}
+
+type TargetConfig struct {
+	Name       string                 `yaml:"name"`
+	Connection TargetConfigConnection `yaml:"connection"`
+}
+
+func (t *TargetConfig) GetParsedHttpURL() (*url.URL, error) {
+	return url.Parse(t.Connection.HTTP.URL)
+}
+
+type RpcGatewayConfig struct {
+	Metrics      MetricsConfig     `yaml:"metrics"`
+	Proxy        ProxyConfig       `yaml:"proxy"`
+	HealthChecks HealthCheckConfig `yaml:"healthChecks"`
+	Targets      []TargetConfig    `yaml:"targets"`
+}

contracts/GasLeft.sol

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+pragma solidity ^0.8;
+
+contract GasLeft {
+
+    function getGasLeft()
+        external
+        returns (uint256)
+    {
+        return gasleft();
+    }
+}

docker-compose.yml

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+version: "3.9"
+services:
+  toxiproxy:
+    image: ghcr.io/shopify/toxiproxy
+    restart: always
+    network_mode: host

example_config.yml

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+metrics:
+  port: "9090" # port for prometheus metrics, served on /metrics and /
+
+proxy:
+  port: "3000" # port for RPC gateway
+  allowedNumberOfRetries: 2 # how many retries should an individual failed RPC request take
+  allowedNumberOfAttempts: 2 # how many attemps should an individual failed RPC request take
+  retryDelay: "10ms" # delay between retries
+  upstreamTimeout: "5s" # when is a request considered timed out
+
+healthChecks:
+  interval: "5s" # how often to do healthchecks
+  timeout: "1s" # when should the timeout occur and considered unhealthy
+  failureThreshold: 2 # how many failed checks until marked as unhealthy
+  successThreshold: 1 # how many successes to be marked as healthy again
+
+targets:
+  - name: "Cloudflare"
+    connection:
+      http: # ws is supported by default, it will be a sticky connection.
+        url: "https://cloudflare-eth.com"

go.mod

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+module 0xProject/rpc-gateway
+
+go 1.17
+
+require (
+	github.com/Shopify/toxiproxy v2.1.4+incompatible
+	github.com/ethereum/go-ethereum v1.10.15
+	github.com/gorilla/mux v1.8.0
+	github.com/prometheus/client_golang v1.11.0
+	go.uber.org/zap v1.21.0
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
+	gopkg.in/yaml.v2 v2.4.0
+)
+
+require (
+	github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/btcsuite/btcd v0.20.1-beta // indirect
+	github.com/cespare/xxhash/v2 v2.1.1 // indirect
+	github.com/deckarep/golang-set v0.0.0-20180603214616-504e848d77ea // indirect
+	github.com/go-ole/go-ole v1.2.1 // indirect
+	github.com/go-stack/stack v1.8.0 // indirect
+	github.com/golang/protobuf v1.4.3 // indirect
+	github.com/google/uuid v1.1.5 // indirect
+	github.com/gorilla/websocket v1.4.2 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/prometheus/client_model v0.2.0 // indirect
+	github.com/prometheus/common v0.26.0 // indirect
+	github.com/prometheus/procfs v0.6.0 // indirect
+	github.com/rjeczalik/notify v0.9.1 // indirect
+	github.com/shirou/gopsutil v3.21.4-0.20210419000835-c7a38de76ee5+incompatible // indirect
+	github.com/tklauser/go-sysconf v0.3.5 // indirect
+	github.com/tklauser/numcpus v0.2.2 // indirect
+	go.uber.org/atomic v1.9.0 // indirect
+	go.uber.org/multierr v1.7.0 // indirect
+	golang.org/x/crypto v0.0.0-20210322153248-0c34fe9e7dc2 // indirect
+	golang.org/x/sys v0.0.0-20210816183151-1e6c022a8912 // indirect
+	google.golang.org/protobuf v1.26.0-rc.1 // indirect
+	gopkg.in/natefinch/npipe.v2 v2.0.0-20160621034901-c1b8fa8bdcce // indirect
+)