// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef LIB_SVC_SVC_H_
#define LIB_SVC_SVC_H_

#include <lib/async/dispatcher.h>
#include <zircon/compiler.h>
#include <zircon/types.h>

__BEGIN_CDECLS

typedef void(svc_connector_t)(void* context, const char* service_name,
                              zx_handle_t service_request);

typedef struct svc_dir svc_dir_t;

__EXPORT zx_status_t svc_dir_create(async_dispatcher_t* dispatcher,
                                    zx_handle_t directory_request,
                                    svc_dir_t** out_result);

// Adds a service named |service_name| to the given |dir|.
//
// If |type| is non-NULL, the service will be published in a directory whose
// name matches the |type|. If |type| is NULL, the service will be published in
// the root directory.
//
// The most commonly used values for |type| are "public", "debug", and "ctrl".
// Services published under "public" are made available to clients via
// |fuchsia.sys.Lancher#CreateComponent|. The "debug" serivices are exposed via
// the hub. The "ctrl" services are used by the core platform to communicate
// with your program.
//
// When a client requests the service, |handler| will be called on the async_t
// passed to |svc_dir_create|. The |context| will be passed to |handler| as its
// first argument.
//
// This may fail in two ways. If an entry with the given
// |service_name| already exists, this returns
// ZX_ERR_ALREADY_EXISTS. If the provided |service_name| is invalid,
// ZX_ERR_INVALID_ARGS is returned. Otherwise, this returns ZX_OK.
__EXPORT zx_status_t svc_dir_add_service(svc_dir_t* dir, const char* type,
                                         const char* service_name,
                                         void* context,
                                         svc_connector_t* handler);

// Removes the service named |service_name| of type |type| from the
// given |dir|. This reports a failure if the entry does not exist, by
// returning ZX_ERR_NOT_FOUND. Otherwise, the service entry is
// removed, and ZX_OK is returned.
__EXPORT zx_status_t svc_dir_remove_service(svc_dir_t* dir, const char* type,
                                            const char* service_name);

// Destroy the provided directory. This currently cannot fail, and
// returns ZX_OK.
__EXPORT zx_status_t svc_dir_destroy(svc_dir_t* dir);

__END_CDECLS

#endif  // LIB_SVC_SVC_H_