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eval.go
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eval.go
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package eval
import (
"bytes"
"fmt"
"regexp"
"github.com/expr-lang/expr"
"github.com/pkg/errors"
"github.com/runabol/tork"
)
var exprMatcher = regexp.MustCompile(`{{\s*(.+?)\s*}}`)
func EvaluateTask(t *tork.Task, c map[string]any) error {
// evaluate name
name, err := EvaluateTemplate(t.Name, c)
if err != nil {
return err
}
t.Name = name
// evaluate var
var_, err := EvaluateTemplate(t.Var, c)
if err != nil {
return err
}
t.Var = var_
// evaluate image
img, err := EvaluateTemplate(t.Image, c)
if err != nil {
return err
}
t.Image = img
// evaluate queue
q, err := EvaluateTemplate(t.Queue, c)
if err != nil {
return err
}
t.Queue = q
// evaluate the env vars
env := t.Env
for k, v := range env {
result, err := EvaluateTemplate(v, c)
if err != nil {
return err
}
env[k] = result
}
t.Env = env
// evaluate if expr
ifExpr, err := EvaluateTemplate(t.If, c)
if err != nil {
return err
}
t.If = ifExpr
// evaluate pre-tasks
pres := make([]*tork.Task, len(t.Pre))
for i, pre := range t.Pre {
if err := EvaluateTask(pre, c); err != nil {
return err
}
pres[i] = pre
}
t.Pre = pres
// evaluate post-tasks
posts := make([]*tork.Task, len(t.Post))
for i, post := range t.Post {
if err := EvaluateTask(post, c); err != nil {
return err
}
posts[i] = post
}
t.Post = posts
// evaluate parallel tasks
if t.Parallel != nil {
parallel := make([]*tork.Task, len(t.Parallel.Tasks))
for i, par := range t.Parallel.Tasks {
if err := EvaluateTask(par, c); err != nil {
return err
}
parallel[i] = par
}
t.Parallel.Tasks = parallel
}
// evaluate cmd
cmd := t.CMD
for i, v := range cmd {
result, err := EvaluateTemplate(v, c)
if err != nil {
return err
}
cmd[i] = result
}
// evaluate sub-job
if t.SubJob != nil {
name, err := EvaluateTemplate(t.SubJob.Name, c)
if err != nil {
return err
}
t.SubJob.Name = name
if t.SubJob.Inputs == nil {
t.SubJob.Inputs = make(map[string]string)
}
for k, v := range t.SubJob.Inputs {
result, err := EvaluateTemplate(v, c)
if err != nil {
return err
}
t.SubJob.Inputs[k] = result
}
for _, wh := range t.SubJob.Webhooks {
url, err := EvaluateTemplate(wh.URL, c)
if err != nil {
return err
}
wh.URL = url
if wh.Headers == nil {
wh.Headers = make(map[string]string)
}
for k, v := range wh.Headers {
result, err := EvaluateTemplate(v, c)
if err != nil {
return err
}
wh.Headers[k] = result
}
}
}
return nil
}
func EvaluateTemplate(ex string, c map[string]any) (string, error) {
if ex == "" {
return "", nil
}
loc := 0
var buf bytes.Buffer
for _, match := range exprMatcher.FindAllStringSubmatchIndex(ex, -1) {
startTag := match[0]
endTag := match[1]
startExpr := match[2]
endExpr := match[3]
buf.WriteString(ex[loc:startTag])
ev, err := EvaluateExpr(ex[startExpr:endExpr], c)
if err != nil {
return "", err
}
buf.WriteString(fmt.Sprintf("%v", ev))
loc = endTag
}
buf.WriteString(ex[loc:])
return buf.String(), nil
}
func ValidExpr(ex string) bool {
ex = sanitizeExpr(ex)
_, err := expr.Compile(ex)
return err == nil
}
func sanitizeExpr(ex string) string {
if matches := exprMatcher.FindStringSubmatch(ex); matches != nil {
return matches[1]
}
return ex
}
func EvaluateExpr(ex string, c map[string]any) (any, error) {
ex = sanitizeExpr(ex)
env := map[string]any{
"randomInt": randomInt,
"sequence": sequence,
}
for k, v := range c {
env[k] = v
}
program, err := expr.Compile(ex, expr.Env(env))
if err != nil {
return "", errors.Wrapf(err, "error compiling expression: %s", ex)
}
output, err := expr.Run(program, env)
if err != nil {
return "", errors.Wrapf(err, "error evaluating expression: %s", ex)
}
return output, nil
}