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invoker-prefix.go
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/
invoker-prefix.go
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package srpc
// PrefixInvoker checks for and strips a set of prefixes from a Invoker.
type PrefixInvoker struct {
// inv is the underlying invoker
inv Invoker
// serviceIDPrefixes is the list of service id prefixes to match.
serviceIDPrefixes []string
}
// NewPrefixInvoker constructs a new PrefixInvoker.
//
// serviceIDPrefixes is the list of service id prefixes to match.
// strips the prefix before calling the underlying Invoke function.
// if none of the prefixes match, returns unimplemented.
// if empty: forwards all services w/o stripping any prefix.
func NewPrefixInvoker(inv Invoker, serviceIDPrefixes []string) *PrefixInvoker {
return &PrefixInvoker{
inv: inv,
serviceIDPrefixes: serviceIDPrefixes,
}
}
// InvokeMethod invokes the method matching the service & method ID.
// Returns false, nil if not found.
// If service string is empty, ignore it.
func (i *PrefixInvoker) InvokeMethod(serviceID, methodID string, strm Stream) (bool, error) {
if len(i.serviceIDPrefixes) != 0 {
strippedID, matchedPrefix := CheckStripPrefix(serviceID, i.serviceIDPrefixes)
if len(matchedPrefix) == 0 {
return false, nil
}
serviceID = strippedID
}
return i.inv.InvokeMethod(serviceID, methodID, strm)
}
// _ is a type assertion
var _ Invoker = ((*PrefixInvoker)(nil))