58 lines
1.6 KiB
V
58 lines
1.6 KiB
V
// This module defines the Context type, which carries deadlines, cancellation signals,
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// and other request-scoped values across API boundaries and between processes.
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// Based on: https://github.com/golang/go/tree/master/src/context
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// Last commit: https://github.com/golang/go/commit/52bf14e0e8bdcd73f1ddfb0c4a1d0200097d3ba2
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module context
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import time
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// A ValueContext carries a key-value pair. It implements Value for that key and
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// delegates all other calls to the embedded Context.
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pub struct ValueContext {
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key Key
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value Any
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mut:
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context Context
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}
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// with_value returns a copy of parent in which the value associated with key is
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// val.
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//
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// Use context Values only for request-scoped data that transits processes and
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// APIs, not for passing optional parameters to functions.
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//
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// The provided key must be comparable and should not be of type
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// string or any other built-in type to avoid collisions between
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// packages using context. Users of with_value should define their own
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// types for keys
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pub fn with_value(parent Context, key Key, value Any) Context {
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return &ValueContext{
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context: parent
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key: key
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value: value
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}
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}
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pub fn (ctx &ValueContext) deadline() ?time.Time {
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return ctx.context.deadline()
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}
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pub fn (mut ctx ValueContext) done() chan int {
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return ctx.context.done()
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}
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pub fn (mut ctx ValueContext) err() IError {
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return ctx.context.err()
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}
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pub fn (ctx &ValueContext) value(key Key) ?Any {
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if ctx.key == key {
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return ctx.value
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}
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return ctx.context.value(key)
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}
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pub fn (ctx &ValueContext) str() string {
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return context_name(ctx.context) + '.with_value'
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}
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