88 lines
2.8 KiB
Go
88 lines
2.8 KiB
Go
package rpc
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import (
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"fmt"
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"strings"
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"git.loafle.net/commons_go/rpc/protocol"
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cuc "git.loafle.net/commons_go/util/context"
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)
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type ServletHandlers struct {
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// The maximum number of pending messages in the queue.
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//
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// The number of pending requsts should exceed the expected number
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// of concurrent goroutines calling client's methods.
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// Otherwise a lot of ClientError.Overflow errors may appear.
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//
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// Default is DefaultPendingMessages.
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PendingMessages int
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codecs map[string]protocol.ServerCodec
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}
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func (sh *ServletHandlers) ServletContext(parent cuc.Context) ServletContext {
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return newServletContext(parent)
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}
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func (sh *ServletHandlers) Init(servletCTX ServletContext) error {
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return nil
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}
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func (sh *ServletHandlers) GetRequest(servletCTX ServletContext, codec protocol.ServerCodec, reader interface{}) (protocol.ServerRequestCodec, error) {
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return nil, fmt.Errorf("Servlet Handler: GetRequest is not implemented")
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}
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func (sh *ServletHandlers) Invoke(servletCTX ServletContext, requestCodec protocol.RegistryCodec) (result interface{}, err error) {
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return nil, fmt.Errorf("Servlet Handler: Invoke is not implemented")
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}
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func (sh *ServletHandlers) SendResponse(servletCTX ServletContext, requestCodec protocol.ServerRequestCodec, writer interface{}, result interface{}, err error) error {
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return fmt.Errorf("Servlet Handler: SendResponse is not implemented")
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}
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func (sh *ServletHandlers) SendNotification(servletCTX ServletContext, codec protocol.ServerCodec, writer interface{}, method string, args ...interface{}) error {
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return fmt.Errorf("Servlet Handler: SendNotification is not implemented")
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}
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func (sh *ServletHandlers) Destroy(servletCTX ServletContext) {
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// no op
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}
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// RegisterCodec adds a new codec to the server.
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//
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// Codecs are defined to process a given serialization scheme, e.g., JSON or
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// XML. A codec is chosen based on the "Content-Type" header from the request,
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// excluding the charset definition.
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func (sh *ServletHandlers) RegisterCodec(contentType string, codec protocol.ServerCodec) {
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if nil == sh.codecs {
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sh.codecs = make(map[string]protocol.ServerCodec)
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}
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sh.codecs[strings.ToLower(contentType)] = codec
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}
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func (sh *ServletHandlers) getCodec(contentType string) (protocol.ServerCodec, error) {
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var codec protocol.ServerCodec
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if contentType == "" && len(sh.codecs) == 1 {
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// If Content-Type is not set and only one codec has been registered,
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// then default to that codec.
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for _, c := range sh.codecs {
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codec = c
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}
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} else if codec = sh.codecs[strings.ToLower(contentType)]; codec == nil {
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return nil, fmt.Errorf("Unrecognized Content-Type: %s", contentType)
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}
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return codec, nil
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}
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func (sh *ServletHandlers) GetPendingMessages() int {
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return sh.PendingMessages
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}
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func (sh *ServletHandlers) Validate() {
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if 0 >= sh.PendingMessages {
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sh.PendingMessages = DefaultPendingMessages
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}
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}
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