Add antithesis PoC workload

tests/antithesis/config.go

@@ -0,0 +1,71 @@
+// Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+package main
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+
+	"github.com/ava-labs/avalanchego/wallet/subnet/primary"
+)
+
+const (
+	URIsKey = "uris"
+
+	FlagsName = "workload"
+	EnvPrefix = "avawl"
+)
+
+var (
+	errNoURIs      = errors.New("at least one URI must be provided")
+	errNoArguments = errors.New("no arguments")
+)
+
+type Config struct {
+	URIs []string
+}
+
+func NewConfig(arguments []string) (*Config, error) {
+	v, err := parseFlags(arguments)
+	if err != nil {
+		return nil, err
+	}
+
+	c := &Config{
+		URIs: v.GetStringSlice(URIsKey),
+	}
+	return c, c.Verify()
+}
+
+func (c *Config) Verify() error {
+	if len(c.URIs) == 0 {
+		return errNoURIs
+	}
+	return nil
+}
+
+func parseFlags(arguments []string) (*viper.Viper, error) {
+	if len(arguments) == 0 {
+		return nil, errNoArguments
+	}
+
+	fs := pflag.NewFlagSet(FlagsName, pflag.ContinueOnError)
+	fs.StringSlice(URIsKey, []string{primary.LocalAPIURI}, "URIs of nodes that the workload can communicate with")
+	if err := fs.Parse(arguments[1:]); err != nil {
+		return nil, fmt.Errorf("failed parsing CLI flags: %w", err)
+	}
+
+	v := viper.New()
+	v.AutomaticEnv()
+	v.SetEnvKeyReplacer(strings.NewReplacer("-", "_"))
+	v.SetEnvPrefix(EnvPrefix)
+	if err := v.BindPFlags(fs); err != nil {
+		return nil, fmt.Errorf("failed binding pflags: %w", err)
+	}
+	return v, nil
+}