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ctx.go
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ctx.go
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package runtimelib
import (
"fmt"
"strings"
rt "github.com/arnodel/golua/runtime"
)
var contextRegistryKey = rt.AsValue(contextRegistry{})
func createContextMetatable(r *rt.Runtime) {
contextMeta := rt.NewTable()
rt.SolemnlyDeclareCompliance(
rt.ComplyCpuSafe|rt.ComplyMemSafe|rt.ComplyTimeSafe|rt.ComplyIoSafe,
r.SetEnvGoFunc(contextMeta, "__index", context__index, 2, false),
r.SetEnvGoFunc(contextMeta, "__tostring", context__tostring, 1, false),
)
resourcesMeta := rt.NewTable()
rt.SolemnlyDeclareCompliance(
rt.ComplyCpuSafe|rt.ComplyMemSafe|rt.ComplyTimeSafe|rt.ComplyIoSafe,
r.SetEnvGoFunc(resourcesMeta, "__index", resources__index, 2, false),
r.SetEnvGoFunc(resourcesMeta, "__tostring", resources__tostring, 1, false),
)
r.SetRegistry(contextRegistryKey, rt.AsValue(&contextRegistry{
contextMeta: contextMeta,
resourcesMeta: resourcesMeta,
}))
}
type contextRegistry struct {
contextMeta *rt.Table
resourcesMeta *rt.Table
}
func getRegistry(r *rt.Runtime) *contextRegistry {
return r.Registry(contextRegistryKey).Interface().(*contextRegistry)
}
func newContextValue(r *rt.Runtime, ctx rt.RuntimeContext) rt.Value {
return r.NewUserDataValue(ctx, getRegistry(r).contextMeta)
}
func valueToContext(v rt.Value) (rt.RuntimeContext, bool) {
u, ok := v.TryUserData()
if !ok {
return nil, false
}
ctx, ok := u.Value().(rt.RuntimeContext)
if !ok {
return nil, false
}
return ctx, true
}
func newResourcesValue(r *rt.Runtime, res rt.RuntimeResources) rt.Value {
return r.NewUserDataValue(res, getRegistry(r).resourcesMeta)
}
func valueToResources(v rt.Value) (res rt.RuntimeResources, ok bool) {
var u *rt.UserData
u, ok = v.TryUserData()
if !ok {
return
}
res, ok = u.Value().(rt.RuntimeResources)
return
}
func contextArg(c *rt.GoCont, n int) (rt.RuntimeContext, error) {
ctx, ok := valueToContext(c.Arg(n))
if ok {
return ctx, nil
}
return nil, fmt.Errorf("#%d must be a runtime context", n+1)
}
func optContextArg(t *rt.Thread, c *rt.GoCont, n int) (rt.RuntimeContext, error) {
if n >= c.NArgs() {
return t.RuntimeContext(), nil
}
return contextArg(c, n)
}
func resourcesArg(c *rt.GoCont, n int) (rt.RuntimeResources, error) {
res, ok := valueToResources(c.Arg(n))
if ok {
return res, nil
}
return res, fmt.Errorf("#%d must be a runtime resources", n+1)
}
func context__index(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
ctx, err := contextArg(c, 0)
if err != nil {
return nil, err
}
key, err := c.StringArg(1)
if err != nil {
return nil, err
}
val := rt.NilValue
switch key {
case "kill":
val = newResourcesValue(t.Runtime, ctx.HardLimits())
case "stop":
val = newResourcesValue(t.Runtime, ctx.SoftLimits())
case "used":
val = newResourcesValue(t.Runtime, ctx.UsedResources())
case "status":
val = statusValue(ctx.Status())
case "parent":
val = rt.NilValue
case "flags":
val = rt.StringValue(strings.Join(ctx.RequiredFlags().Names(), " "))
case "due":
val = rt.BoolValue(ctx.Due())
case "killnow":
val = rt.FunctionValue(killnowGoF)
case "stopnow":
val = rt.FunctionValue(stopnowGoF)
}
return c.PushingNext1(t.Runtime, val), nil
}
func context__tostring(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
ctx, err := contextArg(c, 0)
if err != nil {
return nil, err
}
return c.PushingNext1(t.Runtime, statusValue(ctx.Status())), nil
}
func resources__index(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
res, err := resourcesArg(c, 0)
if err != nil {
return nil, err
}
key, err := c.StringArg(1)
if err != nil {
return nil, err
}
val := rt.NilValue
switch key {
case cpuName:
n := res.Cpu
if n > 0 {
val = resToVal(n)
}
case memoryName:
n := res.Memory
if n > 0 {
val = resToVal(n)
}
case secondsName:
n := res.Millis
if n > 0 {
val = rt.FloatValue(float64(n) / 1000)
}
case millisName:
n := res.Millis
if n > 0 {
val = rt.FloatValue(float64(n))
}
default:
// We'll return nil
}
return c.PushingNext1(t.Runtime, val), nil
}
func resources__tostring(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
res, err := resourcesArg(c, 0)
if err != nil {
return nil, err
}
vals := make([]string, 0, 3)
if res.Cpu > 0 {
vals = append(vals, fmt.Sprintf("%s=%d", cpuName, res.Cpu))
}
if res.Memory > 0 {
vals = append(vals, fmt.Sprintf("%s=%d", memoryName, res.Memory))
}
if res.Millis > 0 {
vals = append(vals, fmt.Sprintf("%s=%g", secondsName, float64(res.Millis)/1000))
}
s := "[" + strings.Join(vals, ",") + "]"
t.RequireBytes(len(s))
return c.PushingNext1(t.Runtime, rt.StringValue(s)), nil
}
func resToVal(v uint64) rt.Value {
return rt.IntValue(int64(v))
}
func statusValue(st rt.RuntimeContextStatus) rt.Value {
s := st.String()
if s == "" {
return rt.NilValue
}
return rt.StringValue(s)
}
func killnow(t *rt.Thread, c *rt.GoCont) (next rt.Cont, err error) {
ctx, err := optContextArg(t, c, 0)
if err != nil {
return nil, err
}
ctx.SetStopLevel(rt.HardStop)
return nil, nil
}
func stopnow(t *rt.Thread, c *rt.GoCont) (next rt.Cont, err error) {
ctx, err := optContextArg(t, c, 0)
if err != nil {
return nil, err
}
ctx.SetStopLevel(rt.SoftStop)
return c.Next(), nil
}
func due(t *rt.Thread, c *rt.GoCont) (next rt.Cont, retErr error) {
ctx, err := optContextArg(t, c, 0)
if err != nil {
return nil, err
}
return c.PushingNext1(t.Runtime, rt.BoolValue(ctx.Due())), nil
}
var (
killnowGoF = rt.NewGoFunction(killnow, "killnow", 1, false)
stopnowGoF = rt.NewGoFunction(stopnow, "stopnow", 1, false)
dueGoF = rt.NewGoFunction(due, "due", 1, false)
)
func init() {
rt.SolemnlyDeclareCompliance(
rt.ComplyCpuSafe|rt.ComplyMemSafe|rt.ComplyTimeSafe|rt.ComplyIoSafe,
killnowGoF,
stopnowGoF,
dueGoF,
)
}