mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-05 18:12:46 +00:00
acc333c40b
When GTS is running in a container runtime which has configured CPU or memory limits or under an init system that uses cgroups to impose CPU and memory limits the values the Go runtime sees for GOMAXPROCS and GOMEMLIMIT are still based on the host resources, not the cgroup. At least for the throttling middlewares which use GOMAXPROCS to configure their queue size, this can result in GTS running with values too big compared to the resources that will actuall be available to it. This introduces 2 dependencies which can pick up resource contraints from the current cgroup and tune the Go runtime accordingly. This should result in the different queues being appropriately sized and in general more predictable performance. These dependencies are a no-op on non-Linux systems or if running in a cgroup that doesn't set a limit on CPU or memory. The automatic tuning of GOMEMLIMIT can be disabled by either explicitly setting GOMEMLIMIT yourself or by setting AUTOMEMLIMIT=off. The automatic tuning of GOMAXPROCS can similarly be counteracted by setting GOMAXPROCS yourself.
151 lines
3.6 KiB
Go
151 lines
3.6 KiB
Go
package dbus
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import (
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"bytes"
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"fmt"
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"reflect"
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"sort"
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"strconv"
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)
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// Variant represents the D-Bus variant type.
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type Variant struct {
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sig Signature
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value interface{}
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}
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// MakeVariant converts the given value to a Variant. It panics if v cannot be
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// represented as a D-Bus type.
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func MakeVariant(v interface{}) Variant {
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return MakeVariantWithSignature(v, SignatureOf(v))
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}
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// MakeVariantWithSignature converts the given value to a Variant.
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func MakeVariantWithSignature(v interface{}, s Signature) Variant {
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return Variant{s, v}
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}
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// ParseVariant parses the given string as a variant as described at
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// https://developer.gnome.org/glib/stable/gvariant-text.html. If sig is not
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// empty, it is taken to be the expected signature for the variant.
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func ParseVariant(s string, sig Signature) (Variant, error) {
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tokens := varLex(s)
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p := &varParser{tokens: tokens}
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n, err := varMakeNode(p)
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if err != nil {
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return Variant{}, err
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}
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if sig.str == "" {
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sig, err = varInfer(n)
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if err != nil {
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return Variant{}, err
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}
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}
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v, err := n.Value(sig)
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if err != nil {
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return Variant{}, err
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}
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return MakeVariant(v), nil
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}
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// format returns a formatted version of v and whether this string can be parsed
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// unambigously.
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func (v Variant) format() (string, bool) {
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switch v.sig.str[0] {
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case 'b', 'i':
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return fmt.Sprint(v.value), true
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case 'n', 'q', 'u', 'x', 't', 'd', 'h':
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return fmt.Sprint(v.value), false
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case 's':
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return strconv.Quote(v.value.(string)), true
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case 'o':
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return strconv.Quote(string(v.value.(ObjectPath))), false
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case 'g':
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return strconv.Quote(v.value.(Signature).str), false
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case 'v':
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s, unamb := v.value.(Variant).format()
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if !unamb {
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return "<@" + v.value.(Variant).sig.str + " " + s + ">", true
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}
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return "<" + s + ">", true
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case 'y':
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return fmt.Sprintf("%#x", v.value.(byte)), false
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}
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rv := reflect.ValueOf(v.value)
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switch rv.Kind() {
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case reflect.Slice:
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if rv.Len() == 0 {
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return "[]", false
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}
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unamb := true
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buf := bytes.NewBuffer([]byte("["))
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for i := 0; i < rv.Len(); i++ {
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// TODO: slooow
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s, b := MakeVariant(rv.Index(i).Interface()).format()
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unamb = unamb && b
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buf.WriteString(s)
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if i != rv.Len()-1 {
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buf.WriteString(", ")
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}
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}
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buf.WriteByte(']')
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return buf.String(), unamb
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case reflect.Map:
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if rv.Len() == 0 {
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return "{}", false
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}
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unamb := true
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var buf bytes.Buffer
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kvs := make([]string, rv.Len())
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for i, k := range rv.MapKeys() {
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s, b := MakeVariant(k.Interface()).format()
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unamb = unamb && b
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buf.Reset()
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buf.WriteString(s)
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buf.WriteString(": ")
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s, b = MakeVariant(rv.MapIndex(k).Interface()).format()
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unamb = unamb && b
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buf.WriteString(s)
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kvs[i] = buf.String()
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}
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buf.Reset()
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buf.WriteByte('{')
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sort.Strings(kvs)
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for i, kv := range kvs {
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if i > 0 {
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buf.WriteString(", ")
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}
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buf.WriteString(kv)
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}
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buf.WriteByte('}')
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return buf.String(), unamb
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}
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return `"INVALID"`, true
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}
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// Signature returns the D-Bus signature of the underlying value of v.
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func (v Variant) Signature() Signature {
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return v.sig
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}
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// String returns the string representation of the underlying value of v as
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// described at https://developer.gnome.org/glib/stable/gvariant-text.html.
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func (v Variant) String() string {
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s, unamb := v.format()
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if !unamb {
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return "@" + v.sig.str + " " + s
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}
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return s
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}
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// Value returns the underlying value of v.
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func (v Variant) Value() interface{} {
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return v.value
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}
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// Store converts the variant into a native go type using the same
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// mechanism as the "Store" function.
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func (v Variant) Store(value interface{}) error {
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return storeInterfaces(v.value, value)
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}
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