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functions.go
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functions.go
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// Inspired by https://github.com/Masterminds/sprig
package main
import (
"encoding/base32"
"encoding/base64"
"encoding/json"
"fmt"
"math"
"math/rand"
"reflect"
"regexp"
"strconv"
"strings"
"text/template"
"time"
"github.com/clbanning/mxj/v2"
"github.com/google/uuid"
"github.com/shopspring/decimal"
"github.com/spf13/cast"
lua "github.com/yuin/gopher-lua"
"go.mongodb.org/mongo-driver/bson"
"gopkg.in/yaml.v3"
)
// templateFunctions extends template functions
func templateFunctions() template.FuncMap {
return template.FuncMap{
"add": add,
"add1": add1,
"sub": sub,
"div": div,
"mod": mod,
"mul": mul,
"addf": addf,
"add1f": add1f,
"subf": subf,
"divf": divf,
"mulf": mulf,
"randInt": randInt,
"round": round,
"max": max,
"min": min,
"maxf": maxf,
"minf": minf,
"dateFormat": dateFormat,
"dateFormatTZ": dateFormatTZ,
"dateToInt": dateToInt,
"intToDate": intToDate,
"now": now,
"b64enc": base64encode,
"b64dec": base64decode,
"b32enc": base32encode,
"b32dec": base32decode,
"uuid": newUUID,
"replaceAll": replaceAll,
"replaceAllRegex": replaceAllRegex,
"regexMatch": regexMatch,
"contains": contains,
"upper": upper,
"lower": lower,
"addSubstring": addSubstring,
"trim": trim,
"trimAll": trimAll,
"trimSuffix": trimSuffix,
"indexOf": indexOf,
"trimPrefix": trimPrefix,
"atoi": atoi,
"toBool": toBool,
"toString": toString,
"toInt": toInt,
"toInt64": toInt64,
"toFloat64": toFloat64,
"toDecimal": toDecimal,
"toDecimalString": toDecimalString,
"toJSON": toJSON,
"toBSON": toBSON,
"toYAML": toYAML,
"toXML": toXML,
"isBool": isBool,
"isInt": isInt,
"isFloat64": isFloat64,
"isString": isString,
"isMap": isMap,
"isArray": isArray,
"mustArray": mustArray,
"mapJSON": mapJSON,
"lua": luaF,
}
}
// add count
func add(a ...interface{}) (r int64) {
for i := range a {
r += toInt64(a[i])
}
return
}
// add1 input+1
func add1(a interface{}) int64 { return toInt64(a) + 1 }
// sub substitute
func sub(a, b interface{}) int64 { return toInt64(a) - toInt64(b) }
// div divide
func div(a, b interface{}) int64 { return toInt64(a) / toInt64(b) }
// mod modulo
func mod(a, b interface{}) int64 { return toInt64(a) % toInt64(b) }
// mul multiply
func mul(a ...interface{}) (r int64) {
r = 1
for i := range a {
r = r * toInt64(a[i])
}
return r
}
// addf count float
func addf(i ...interface{}) float64 {
a := interface{}(float64(0))
return execDecimalOp(a, i, func(d1, d2 decimal.Decimal) decimal.Decimal { return d1.Add(d2) })
}
// add1f inputFloat+1
func add1f(i interface{}) float64 {
return execDecimalOp(i, []interface{}{1}, func(d1, d2 decimal.Decimal) decimal.Decimal { return d1.Add(d2) })
}
// subf substitute float
func subf(a interface{}, v ...interface{}) float64 {
return execDecimalOp(a, v, func(d1, d2 decimal.Decimal) decimal.Decimal { return d1.Sub(d2) })
}
// divide float
func divf(a interface{}, v ...interface{}) float64 {
return execDecimalOp(a, v, func(d1, d2 decimal.Decimal) decimal.Decimal { return d1.Div(d2) })
}
// mulf multiply float
func mulf(a interface{}, v ...interface{}) float64 {
return execDecimalOp(a, v, func(d1, d2 decimal.Decimal) decimal.Decimal { return d1.Mul(d2) })
}
// randInt returns random integer in defined range {{randInt min max}} e.g. {{randInt 1 10}}
func randInt(min, max int) int { return rand.Intn(max-min) + min }
// round float {{round .val 2}} -> 2 decimals or {{round .val 1 0.4}} 0.4 round point
func round(a interface{}, p int, rOpt ...float64) float64 {
roundOn := .5
if len(rOpt) > 0 {
roundOn = rOpt[0]
}
val := toFloat64(a)
places := toFloat64(p)
var round float64
pow := math.Pow(10, places)
digit := pow * val
_, div := math.Modf(digit)
if div >= roundOn {
round = math.Ceil(digit)
} else {
round = math.Floor(digit)
}
return round / pow
}
// max return highest from numbers {{max .v1 .v2 .v3}}
func max(a interface{}, numbers ...interface{}) int64 {
aa := toInt64(a)
for i := range numbers {
bb := toInt64(numbers[i])
if bb > aa {
aa = bb
}
}
return aa
}
// min return lowest from numbers {{min .v1 .v2 .v3}}
func min(a interface{}, numbers ...interface{}) int64 {
aa := toInt64(a)
for i := range numbers {
bb := toInt64(numbers[i])
if bb < aa {
aa = bb
}
}
return aa
}
// maxf return highest from float numbers {{maxf .v1 .v2 .v3}}
func maxf(a interface{}, numbers ...interface{}) float64 {
aa := toFloat64(a)
for i := range numbers {
bb := toFloat64(numbers[i])
aa = math.Max(aa, bb)
}
return aa
}
// minf return lowest from float numbers {{minf .v1 .v2 .v3}}
func minf(a interface{}, numbers ...interface{}) float64 {
aa := toFloat64(a)
for i := range numbers {
bb := toFloat64(numbers[i])
aa = math.Min(aa, bb)
}
return aa
}
// dateFormat convert date format {{dateFormat "string", "inputPattern", "outputPattern"}} e.g. {{dateFormat "15.03.2021", "02.01.2006", "01022006"}}
func dateFormat(date string, inputFormat string, outputFormat string) string {
timeParsed, err := time.Parse(inputFormat, date)
if err != nil {
return date
}
return timeParsed.Format(outputFormat)
}
func dateFormatTZ(date string, inputFormat string, outputFormat string, timeZone string) string {
location, err := time.LoadLocation(timeZone)
if err != nil {
return "err: unknownTimeZone"
}
timeParsed, err := time.Parse(inputFormat, date)
if err != nil {
return "err: wrongFormatDefinition"
}
timeParsed = timeParsed.In(location)
return timeParsed.Format(outputFormat)
}
// convert date to unix timestamp
func dateToInt(date string, inputFormat string) int64 {
timeParsed, err := time.Parse(inputFormat, date)
if err != nil {
return 0
}
return timeParsed.Unix()
}
// convert unix timestamp to date
func intToDate(unixTime interface{}, outputFormat string) string {
return time.Unix(toInt64(unixTime), 0).Format(outputFormat)
}
// now return current date/time in specified format
func now(format string) string {
return time.Now().Format(format)
}
// base64encode encode to base64
func base64encode(v string) string {
return base64.StdEncoding.EncodeToString([]byte(v))
}
// base64decode decode from base64
func base64decode(v string) string {
data, err := base64.StdEncoding.DecodeString(v)
if err != nil {
return err.Error()
}
return string(data)
}
// base32encode encode to base32
func base32encode(v string) string {
return base32.StdEncoding.EncodeToString([]byte(v))
}
// base32decode decode from base32
func base32decode(v string) string {
data, err := base32.StdEncoding.DecodeString(v)
if err != nil {
return err.Error()
}
return string(data)
}
// newUUID returns UUID
func newUUID() string { return uuid.New().String() }
func replaceAll(old, new, src string) string {
return strings.Replace(src, old, new, -1)
}
func replaceAllRegex(regex, new, src string) string {
r := regexp.MustCompile(regex)
return r.ReplaceAllString(src, new)
}
// regexMatch check regex e.g. {{regexMatch "a.b", "aaxbb"}}
func regexMatch(regex string, s string) bool {
match, _ := regexp.MatchString(regex, s)
return match
}
// contains check if string contains substring e.g. {{contains "aaxbb" "xb"}}
func contains(str string, substr string) bool {
return strings.Contains(str, substr)
}
// upper string to uppercase
func upper(s string) string {
return strings.ToUpper(s)
}
// lower string to lowercase
func lower(s string) string {
return strings.ToLower(s)
}
// addSubstring add substring to string {{addSubstring "abcd", "efg", 2}} -> "abefgcd"
func addSubstring(s string, ss string, pos interface{}) string {
if toInt(pos) >= len(s) || -toInt(pos) >= len(s) {
return "err:substringOutOfRange"
}
switch x := toInt(pos); {
case x == 0:
return s
case x > 0:
return fmt.Sprintf("%s%s%s", s[:len(s)-x], ss, s[len(s)-x:])
case x < 0:
return fmt.Sprintf("%s%s%s", s[:-x], ss, s[-x:])
default:
return "inputError"
}
}
// trim remove leading and trailing white space
func trim(s string) string {
return strings.TrimSpace(s)
}
// trimAll remove leading and trailing whitespace
func trimAll(a, b string) string { return strings.Trim(a, b) }
// {{trimPrefix "!Hello World!" "!"}} - returns "Hello World!"
func trimPrefix(a, b string) string { return strings.TrimPrefix(a, b) }
// trimSuffix - {{trimSuffix "!Hello World!" "!"}} - returns "!HelloWorld"
func trimSuffix(a, b string) string { return strings.TrimSuffix(a, b) }
// indexOf {{indexOf "abcd", "bc"}} -> 1
// TODO: add to tests and documentation
func indexOf(a, b string) int {
return strings.Index(a, b)
}
// atoi {{atoi "42"}} - string to int
func atoi(a string) int { i, _ := strconv.Atoi(a); return i }
func toBool(v interface{}) bool {
return cast.ToBool(v)
}
// toInt convert to int
func toInt(v interface{}) int {
return cast.ToInt(v)
}
func toString(v interface{}) string {
return cast.ToString(v)
}
// toInt64 converts integer types to 64-bit integers
func toInt64(v interface{}) int64 {
return cast.ToInt64(v)
}
// toFloat64 converts 64-bit floats
func toFloat64(v interface{}) float64 {
return cast.ToFloat64(v)
}
// toDecimal input to decimal
func toDecimal(i interface{}) decimal.Decimal {
value, err := convertDecimal(i)
if err != nil {
return decimal.Zero
}
return value
}
// toDecimalString input to decimal string
func toDecimalString(i interface{}) string {
value, err := convertDecimal(i)
if err != nil {
return fmt.Sprintf("err: %s", err.Error())
}
return value.String()
}
// toJSON convert to JSON
func toJSON(data interface{}) string {
out, err := json.MarshalIndent(data, "", " ")
if err != nil {
return fmt.Sprintf("err: %s", err.Error())
}
return string(out)
}
// toBSON convert to BSON
func toBSON(data interface{}) string {
out, err := bson.Marshal(data)
if err != nil {
return fmt.Sprintf("err: %s", err.Error())
}
return string(out)
}
// toYAML convert to YAML
func toYAML(data interface{}) string {
out, err := yaml.Marshal(data)
if err != nil {
return fmt.Sprintf("err: %s", err.Error())
}
return string(out)
}
// toXML convert to XML
func toXML(data interface{}) string {
var err error
out := []byte("<doc>\r\n")
if reflect.TypeOf(data).Kind() == reflect.Slice {
if reflect.TypeOf(data).Kind() == reflect.Slice {
for i := 0; i < reflect.ValueOf(data).Len(); i++ {
x, err := mxj.AnyXmlIndent(data.([]map[string]interface{})[i], "", " ", "record")
if err != nil {
return fmt.Sprintf("err: %s", err.Error())
}
out = append(out, string(x)+"\r\n"...)
}
out = append(out, string("</doc>\r\n")...)
out, err = mxj.BeautifyXml(out, "", " ")
if err != nil {
return fmt.Sprintf("err: %s", err.Error())
}
return string(out)
}
}
out, err = mxj.AnyXmlIndent(data, "", " ", "doc")
if err != nil {
return fmt.Sprintf("err: %s", err.Error())
}
return string(out)
}
// isBool check if value is bool
func isBool(i interface{}) bool {
_, ok := i.(bool)
return ok
}
// isInt check if value is int
func isInt(i interface{}) bool {
_, ok := i.(int)
return ok
}
// isFloat64 check if value is float64
func isFloat64(i interface{}) bool {
_, ok := i.(float64)
return ok
}
// isString check if value is string
func isString(v interface{}) bool {
_, ok := v.(string)
return ok
}
// isMap check if value is map
func isMap(v interface{}) bool {
_, ok := v.(map[string]interface{})
return ok
}
// isArray check if value is array
func isArray(v interface{}) bool {
_, ok := v.([]interface{})
return ok
}
// mustArray - convert to array. Useful with XML where single record is not treated as array
func mustArray(v interface{}) []interface{} { // convert to []interface{}
if v == nil {
return nil
}
if a, ok := v.([]interface{}); ok {
return a
}
return []interface{}{v}
}
// mapJSON string JSON to map[string]interface{} so it can be used in pipline -> template
func mapJSON(input string) map[string]interface{} {
var mapData map[string]interface{}
if err := json.Unmarshal([]byte(input), &mapData); err != nil {
testData := make(map[string]interface{})
testData["error"] = err.Error()
return testData
}
return mapData
}
// luaF Call LUA function {{lua "functionName" input1 input2 input3 ...}
// 1. Functions must be placed in ./lua/functions, 2. Inputs are passed as stringified json 3. Output of lua function must be string
func luaF(i ...interface{}) string {
if luaData == nil {
return "error: ./lua/functions.lua file missing)"
}
strData, err := json.Marshal(i[1:])
if err != nil {
return fmt.Sprintf("luaInputError: %s\r\n", err.Error())
}
if err := luaData.CallByParam(
lua.P{Fn: luaData.GetGlobal(i[0].(string)), NRet: 1, Protect: true}, lua.LString(string(strData))); err != nil {
return fmt.Sprintf("luaError: %s\r\n", err.Error())
}
if str, ok := luaData.Get(-1).(lua.LString); ok {
luaData.Pop(1)
return str.String()
}
return "luaError: getResult"
}
// execDecimalOp convert float to decimal
func execDecimalOp(a interface{}, b []interface{}, f func(d1, d2 decimal.Decimal) decimal.Decimal) float64 {
prt := decimal.NewFromFloat(toFloat64(a))
for _, x := range b {
dx := decimal.NewFromFloat(toFloat64(x))
prt = f(prt, dx)
}
rslt, _ := prt.Float64()
return rslt
}
// convertDecimal converts a number to a decimal.Decimal
func convertDecimal(i interface{}) (decimal.Decimal, error) {
switch v := i.(type) {
case decimal.Decimal:
return v, nil
case float64:
return decimal.NewFromFloat(v), nil
case int:
return decimal.NewFromFloat(float64(v)), nil
case int64:
return decimal.NewFromFloat(float64(v)), nil
case string:
value, err := decimal.NewFromString(v)
if err != nil {
return decimal.Zero, err
}
return value, nil
default:
return decimal.Zero, fmt.Errorf("unsupported type: %T", i)
}
}