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ctx.go
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ctx.go
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/*
Current request context data.
`kong.ctx.shared`:
A table that has the lifetime of the current request and is shared between
all plugins. It can be used to share data between several plugins in a given
request.
Values inserted in this table by a plugin will be visible by all other
plugins. One must use caution when interacting with its values, as a naming
conflict could result in the overwrite of data.
Usage:
// Two plugins A and B, if plugin A has a higher priority than B's
// (it executes before B), and plugin A is a Go plugin:
// plugin A PluginA.go
func (conf Config) Access(kong *pdk.PDK) {
err := kong.Ctx.SetShared("foo", "hello world")
if err != nil {
kong.Log.Err(err)
return
}
}
// plugin B handler.lua
function plugin_b_handler:access(conf)
kong.log(kong.ctx.shared.foo) // "hello world"
end
*/
package ctx
import (
"github.com/Kong/go-pdk/bridge"
"github.com/Kong/go-pdk/server/kong_plugin_protocol"
"google.golang.org/protobuf/types/known/structpb"
)
// Holds this module's functions. Accessible as `kong.Ctx`
type Ctx struct {
bridge.PdkBridge
}
// kong.Ctx.SetShared() sets a value in the `kong.ctx.shared` request context table.
func (c Ctx) SetShared(k string, value interface{}) error {
v, err := structpb.NewValue(value)
if err != nil {
return err
}
return c.Ask(`kong.ctx.shared.set`, &kong_plugin_protocol.KV{K: k, V: v}, nil)
}
// kong.Ctx.GetSharedAny() returns a value from the `kong.ctx.shared` request context table.
func (c Ctx) GetSharedAny(k string) (interface{}, error) {
return c.AskValue(`kong.ctx.shared.get`, bridge.WrapString(k))
}
// kong.Ctx.GetSharedString() returns a string value from the `kong.ctx.shared` request context table.
func (c Ctx) GetSharedString(k string) (string, error) {
v, err := c.GetSharedAny(k)
if err != nil {
return "", err
}
s, ok := v.(string)
if ok {
return s, nil
}
return "", bridge.ReturnTypeError("string")
}
// kong.Ctx.GetSharedFloat() returns a float value from the `kong.ctx.shared` request context table.
func (c Ctx) GetSharedFloat(k string) (float64, error) {
v, err := c.GetSharedAny(k)
if err != nil {
return 0, err
}
f, ok := v.(float64)
if ok {
return f, nil
}
return 0, bridge.ReturnTypeError("number")
}