Add basic API client (#19)

api/internal/parseutil/parseutil.go

@@ -0,0 +1,174 @@
+package parseutil
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/hashicorp/errwrap"
+	sockaddr "github.com/hashicorp/go-sockaddr"
+	"github.com/hashicorp/watchtower/api/internal/strutil"
+	"github.com/mitchellh/mapstructure"
+)
+
+func ParseDurationSecond(in interface{}) (time.Duration, error) {
+	var dur time.Duration
+	jsonIn, ok := in.(json.Number)
+	if ok {
+		in = jsonIn.String()
+	}
+	switch inp := in.(type) {
+	case nil:
+		// return default of zero
+	case string:
+		if inp == "" {
+			return dur, nil
+		}
+		var err error
+		// Look for a suffix otherwise its a plain second value
+		if strings.HasSuffix(inp, "s") || strings.HasSuffix(inp, "m") || strings.HasSuffix(inp, "h") || strings.HasSuffix(inp, "ms") {
+			dur, err = time.ParseDuration(inp)
+			if err != nil {
+				return dur, err
+			}
+		} else {
+			// Plain integer
+			secs, err := strconv.ParseInt(inp, 10, 64)
+			if err != nil {
+				return dur, err
+			}
+			dur = time.Duration(secs) * time.Second
+		}
+	case int:
+		dur = time.Duration(inp) * time.Second
+	case int32:
+		dur = time.Duration(inp) * time.Second
+	case int64:
+		dur = time.Duration(inp) * time.Second
+	case uint:
+		dur = time.Duration(inp) * time.Second
+	case uint32:
+		dur = time.Duration(inp) * time.Second
+	case uint64:
+		dur = time.Duration(inp) * time.Second
+	case float32:
+		dur = time.Duration(inp) * time.Second
+	case float64:
+		dur = time.Duration(inp) * time.Second
+	case time.Duration:
+		dur = inp
+	default:
+		return 0, errors.New("could not parse duration from input")
+	}
+
+	return dur, nil
+}
+
+func ParseInt(in interface{}) (int64, error) {
+	var ret int64
+	jsonIn, ok := in.(json.Number)
+	if ok {
+		in = jsonIn.String()
+	}
+	switch in.(type) {
+	case string:
+		inp := in.(string)
+		if inp == "" {
+			return 0, nil
+		}
+		var err error
+		left, err := strconv.ParseInt(inp, 10, 64)
+		if err != nil {
+			return ret, err
+		}
+		ret = left
+	case int:
+		ret = int64(in.(int))
+	case int32:
+		ret = int64(in.(int32))
+	case int64:
+		ret = in.(int64)
+	case uint:
+		ret = int64(in.(uint))
+	case uint32:
+		ret = int64(in.(uint32))
+	case uint64:
+		ret = int64(in.(uint64))
+	default:
+		return 0, errors.New("could not parse value from input")
+	}
+
+	return ret, nil
+}
+
+func ParseBool(in interface{}) (bool, error) {
+	var result bool
+	if err := mapstructure.WeakDecode(in, &result); err != nil {
+		return false, err
+	}
+	return result, nil
+}
+
+func ParseCommaStringSlice(in interface{}) ([]string, error) {
+	rawString, ok := in.(string)
+	if ok && rawString == "" {
+		return []string{}, nil
+	}
+	var result []string
+	config := &mapstructure.DecoderConfig{
+		Result:           &result,
+		WeaklyTypedInput: true,
+		DecodeHook:       mapstructure.StringToSliceHookFunc(","),
+	}
+	decoder, err := mapstructure.NewDecoder(config)
+	if err != nil {
+		return nil, err
+	}
+	if err := decoder.Decode(in); err != nil {
+		return nil, err
+	}
+	return strutil.TrimStrings(result), nil
+}
+
+func ParseAddrs(addrs interface{}) ([]*sockaddr.SockAddrMarshaler, error) {
+	out := make([]*sockaddr.SockAddrMarshaler, 0)
+	stringAddrs := make([]string, 0)
+
+	switch addrs.(type) {
+	case string:
+		stringAddrs = strutil.ParseArbitraryStringSlice(addrs.(string), ",")
+		if len(stringAddrs) == 0 {
+			return nil, fmt.Errorf("unable to parse addresses from %v", addrs)
+		}
+
+	case []string:
+		stringAddrs = addrs.([]string)
+
+	case []interface{}:
+		for _, v := range addrs.([]interface{}) {
+			stringAddr, ok := v.(string)
+			if !ok {
+				return nil, fmt.Errorf("error parsing %v as string", v)
+			}
+			stringAddrs = append(stringAddrs, stringAddr)
+		}
+
+	default:
+		return nil, fmt.Errorf("unknown address input type %T", addrs)
+	}
+
+	for _, addr := range stringAddrs {
+		sa, err := sockaddr.NewSockAddr(addr)
+		if err != nil {
+			return nil, errwrap.Wrapf(fmt.Sprintf("error parsing address %q: {{err}}", addr), err)
+		}
+		out = append(out, &sockaddr.SockAddrMarshaler{
+			SockAddr: sa,
+		})
+	}
+
+	return out, nil
+}