text: /*
   * Copyright (c) 2016-2019 Cisco and/or its affiliates.
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at:
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  #ifndef __included_uri_h__
  #define __included_uri_h__
  
  #include <vlibmemory/api.h>
  #include <svm/message_queue.h>
  #include <vnet/session/session_types.h>
  #include <vnet/tls/tls_test.h>
  #include <svm/fifo_segment.h>
  
  typedef struct certificate_
  {
    u32 *app_interests;		/* vec of application index asking for deletion cb */
    u32 cert_key_index;		/* index in cert & key pool */
    u8 *key;
    u8 *cert;
  } app_cert_key_pair_t;
  
  typedef struct session_cb_vft_
  {
    /** Notify server of new segment */
    int (*add_segment_callback) (u32 app_wrk_index, u64 segment_handle);
  
    /** Notify server of new segment */
    int (*del_segment_callback) (u32 app_wrk_index, u64 segment_handle);
  
    /** Notify server of newly accepted session */
    int (*session_accept_callback) (session_t * new_session);
  
    /** Connection request callback */
    int (*session_connected_callback) (u32 app_wrk_index, u32 opaque,
  				     session_t * s, session_error_t code);
  
    /** Notify app that session is closing */
    void (*session_disconnect_callback) (session_t * s);
  
    /** Notify app that transport is closed */
    void (*session_transport_closed_callback) (session_t * s);
  
    /** Notify app that session or transport are about to be removed */
    void (*session_cleanup_callback) (session_t * s, session_cleanup_ntf_t ntf);
  
    /** Notify app that session was reset */
    void (*session_reset_callback) (session_t * s);
  
    /** Notify app that session pool migration happened */
    void (*session_migrate_callback) (session_t * s, session_handle_t new_sh);
  
    /** Direct RX callback for built-in application */
    int (*builtin_app_rx_callback) (session_t * session);
  
    /** Direct TX callback for built-in application */
    int (*builtin_app_tx_callback) (session_t * session);
  
    /** Cert and key pair delete notification */
    int (*app_cert_key_pair_delete_callback) (app_cert_key_pair_t * ckpair);
  
    /** Delegate fifo-tuning-logic to application */
    int (*fifo_tuning_callback) (session_t * s, svm_fifo_t * f,
  			       session_ft_action_t act, u32 bytes);
  
  } session_cb_vft_t;
  
  #define foreach_app_init_args			\
    _(u32, api_client_index)			\
    _(u8 *, name)					\
    _(u64 *, options)				\
    _(u8 *, namespace_id)				\
    _(session_cb_vft_t *, session_cb_vft)		\
    _(u32, app_index)				\
  
  typedef struct _vnet_app_attach_args_t
  {
  #define _(_type, _name) _type _name;
    foreach_app_init_args
  #undef _
    ssvm_private_t * segment;
    svm_msg_q_t *app_evt_q;
    u64 segment_handle;
  } vnet_app_attach_args_t;
  
  typedef struct _vnet_app_detach_args_t
  {
    u32 app_index;
    u32 api_client_index;
  } vnet_app_detach_args_t;
  
  typedef struct _vnet_bind_args_t
  {
    union
    {
      session_endpoint_cfg_t sep_ext;
      session_endpoint_t sep;
      char *uri;
    };
  
    u32 app_index;
    u32 wrk_map_index;
  
    /*
     * Results
     */
    char *segment_name;
    u32 segment_name_length;
    u64 server_event_queue_address;
    u64 handle;
  } vnet_listen_args_t;
  
  typedef struct _vnet_unlisten_args_t
  {
    union
    {
      char *uri;
      u64 handle;			/**< Session handle */
    };
    u32 app_index;		/**< Owning application index */
    u32 wrk_map_index;		/**< App's local pool worker index */
  } vnet_unlisten_args_t;
  
  typedef struct _vnet_connect_args
  {
    union
    {
      session_endpoint_cfg_t sep_ext;
      session_endpoint_t sep;
      char *uri;
    };
    u32 app_index;
    u32 wrk_map_index;
    u32 api_context;
  
    session_handle_t session_handle;
  } vnet_connect_args_t;
  
  typedef struct _vnet_disconnect_args_t
  {
    session_handle_t handle;
    u32 app_index;
  } vnet_disconnect_args_t;
  
  typedef struct _vnet_application_add_tls_cert_args_t
  {
    u32 app_index;
    u8 *cert;
  } vnet_app_add_tls_cert_args_t;
  
  typedef struct _vnet_application_add_tls_key_args_t
  {
    u32 app_index;
    u8 *key;
  } vnet_app_add_tls_key_args_t;
  
  typedef enum crypto_engine_type_
  {
    CRYPTO_ENGINE_NONE,
    CRYPTO_ENGINE_OPENSSL,
    CRYPTO_ENGINE_MBEDTLS,
    CRYPTO_ENGINE_VPP,
    CRYPTO_ENGINE_PICOTLS,
    CRYPTO_ENGINE_LAST = CRYPTO_ENGINE_PICOTLS,
  } crypto_engine_type_t;
  
  typedef struct _vnet_app_add_cert_key_pair_args_
  {
    u8 *cert;
    u8 *key;
    u32 index;
  } vnet_app_add_cert_key_pair_args_t;
  
  typedef struct crypto_ctx_
  {
    u32 ctx_index;		/**< index in crypto context pool */
    u32 n_subscribers;		/**< refcount of sessions using said context */
    u32 ckpair_index;		/**< certificate & key */
    u8 crypto_engine;
    void *data;			/**< protocol specific data */
  } crypto_context_t;
  
  /* Application attach options */
  typedef enum
  {
    APP_OPTIONS_FLAGS,
    APP_OPTIONS_EVT_QUEUE_SIZE,
    APP_OPTIONS_SEGMENT_SIZE,
    APP_OPTIONS_ADD_SEGMENT_SIZE,
    APP_OPTIONS_PRIVATE_SEGMENT_COUNT,
    APP_OPTIONS_RX_FIFO_SIZE,
    APP_OPTIONS_TX_FIFO_SIZE,
    APP_OPTIONS_PREALLOC_FIFO_PAIRS,
    APP_OPTIONS_PREALLOC_FIFO_HDRS,
    APP_OPTIONS_NAMESPACE,
    APP_OPTIONS_NAMESPACE_SECRET,
    APP_OPTIONS_PROXY_TRANSPORT,
    APP_OPTIONS_ACCEPT_COOKIE,
    APP_OPTIONS_TLS_ENGINE,
    APP_OPTIONS_MAX_FIFO_SIZE,
    APP_OPTIONS_HIGH_WATERMARK,
    APP_OPTIONS_LOW_WATERMARK,
    APP_OPTIONS_PCT_FIRST_ALLOC,
    APP_OPTIONS_N_OPTIONS
  } app_attach_options_index_t;
  
  #define foreach_app_options_flags				\
    _(ACCEPT_REDIRECT, "Use FIFO with redirects")			\
    _(ADD_SEGMENT, "Add segment and signal app if needed")	\
    _(IS_BUILTIN, "Application is builtin")			\
    _(IS_TRANSPORT_APP, "Application is a transport proto")	\
    _(IS_PROXY, "Application is proxying")			\
    _(USE_GLOBAL_SCOPE, "App can use global session scope")	\
    _(USE_LOCAL_SCOPE, "App can use local session scope")		\
    _(EVT_MQ_USE_EVENTFD, "Use eventfds for signaling")		\
  
  typedef enum _app_options
  {
  #define _(sym, str) APP_OPTIONS_##sym,
    foreach_app_options_flags
  #undef _
  } app_options_t;
  
  typedef enum _app_options_flags
  {
  #define _(sym, str) APP_OPTIONS_FLAGS_##sym = 1 << APP_OPTIONS_##sym,
    foreach_app_options_flags
  #undef _
  } app_options_flags_t;
  
  #define foreach_fd_type						\
    _(VPP_MQ_SEGMENT, "Fd for vpp's event mq segment")		\
    _(MEMFD_SEGMENT, "Fd for memfd segment")			\
    _(MQ_EVENTFD, "Event fd used by message queue")		\
    _(VPP_MQ_EVENTFD, "Event fd used by vpp's message queue")	\
  
  typedef enum session_fd_type_
  {
  #define _(sym, str) SESSION_FD_##sym,
    foreach_fd_type
  #undef _
    SESSION_N_FD_TYPE
  } session_fd_type_t;
  
  typedef enum session_fd_flag_
  {
  #define _(sym, str) SESSION_FD_F_##sym = 1 << SESSION_FD_##sym,
    foreach_fd_type
  #undef _
  } session_fd_flag_t;
  
  int parse_uri (char *uri, session_endpoint_cfg_t * sep);
  int vnet_bind_uri (vnet_listen_args_t *);
  int vnet_unbind_uri (vnet_unlisten_args_t * a);
  int vnet_connect_uri (vnet_connect_args_t * a);
  
  int vnet_application_attach (vnet_app_attach_args_t * a);
  int vnet_application_detach (vnet_app_detach_args_t * a);
  int vnet_listen (vnet_listen_args_t * a);
  int vnet_connect (vnet_connect_args_t * a);
  int vnet_unlisten (vnet_unlisten_args_t * a);
  int vnet_disconnect_session (vnet_disconnect_args_t * a);
  
  clib_error_t *vnet_app_add_tls_cert (vnet_app_add_tls_cert_args_t * a);
  clib_error_t *vnet_app_add_tls_key (vnet_app_add_tls_key_args_t * a);
  int vnet_app_add_cert_key_pair (vnet_app_add_cert_key_pair_args_t * a);
  int vnet_app_del_cert_key_pair (u32 index);
  /** Ask for app cb on pair deletion */
  int vnet_app_add_cert_key_interest (u32 index, u32 app_index);
  
  typedef struct app_session_transport_
  {
    ip46_address_t rmt_ip;	/**< remote ip */
    ip46_address_t lcl_ip;	/**< local ip */
    u16 rmt_port;			/**< remote port (network order) */
    u16 lcl_port;			/**< local port (network order) */
    u8 is_ip4;			/**< set if uses ip4 networking */
  } app_session_transport_t;
  
  #define foreach_app_session_field					\
    _(svm_fifo_t, *rx_fifo)		/**< rx fifo */			\
    _(svm_fifo_t, *tx_fifo)		/**< tx fifo */			\
    _(session_type_t, session_type)	/**< session type */		\
    _(volatile u8, session_state)		/**< session state */		\
    _(u32, session_index)			/**< index in owning pool */	\
    _(app_session_transport_t, transport)	/**< transport info */		\
    _(svm_msg_q_t, *vpp_evt_q)		/**< vpp event queue  */	\
    _(u8, is_dgram)			/**< flag for dgram mode */	\
  
  typedef struct
  {
  #define _(type, name) type name;
    foreach_app_session_field
  #undef _
  } app_session_t;
  
  typedef struct session_listen_msg_
  {
    u32 client_index;
    u32 context;			/* Not needed but keeping it for compatibility with bapi */
    u32 wrk_index;
    u32 vrf;
    u16 port;
    u8 proto;
    u8 is_ip4;
    ip46_address_t ip;
    u32 ckpair_index;
    u8 crypto_engine;
    u8 flags;
  } __clib_packed session_listen_msg_t;
  
  STATIC_ASSERT (sizeof (session_listen_msg_t) <= SESSION_CTRL_MSG_MAX_SIZE,
  	       "msg too large");
  
  typedef struct session_listen_uri_msg_
  {
    u32 client_index;
    u32 context;
    u8 uri[56];
  } __clib_packed session_listen_uri_msg_t;
  
  STATIC_ASSERT (sizeof (session_listen_uri_msg_t) <= SESSION_CTRL_MSG_MAX_SIZE,
  	       "msg too large");
  
  typedef struct session_bound_msg_
  {
    u32 context;
    u64 handle;
    i32 retval;
    u8 lcl_is_ip4;
    u8 lcl_ip[16];
    u16 lcl_port;
    uword rx_fifo;
    uword tx_fifo;
    uword vpp_evt_q;
    u32 segment_size;
    u8 segment_name_length;
    u8 segment_name[128];
  } __clib_packed session_bound_msg_t;
  
  typedef struct session_unlisten_msg_
  {
    u32 client_index;
    u32 context;
    u32 wrk_index;
    session_handle_t handle;
  } __clib_packed session_unlisten_msg_t;
  
  typedef struct session_unlisten_reply_msg_
  {
    u32 context;
    u64 handle;
    i32 retval;
  } __clib_packed session_unlisten_reply_msg_t;
  
  typedef struct session_accepted_msg_
  {
    u32 context;
    u64 listener_handle;
    u64 handle;
    uword server_rx_fifo;
    uword server_tx_fifo;
    u64 segment_handle;
    uword vpp_event_queue_address;
    transport_endpoint_t rmt;
    u8 flags;
  } __clib_packed session_accepted_msg_t;
  
  typedef struct session_accepted_reply_msg_
  {
    u32 context;
    i32 retval;
    u64 handle;
  } __clib_packed session_accepted_reply_msg_t;
  
  typedef struct session_connect_msg_
  {
    u32 client_index;
    u32 context;
    u32 wrk_index;
    u32 vrf;
    u16 port;
    u16 lcl_port;
    u8 proto;
    u8 is_ip4;
    ip46_address_t ip;
    ip46_address_t lcl_ip;
    u8 hostname_len;
    u8 hostname[16];
    u64 parent_handle;
    u32 ckpair_index;
    u8 crypto_engine;
    u8 flags;
  } __clib_packed session_connect_msg_t;
  
  STATIC_ASSERT (sizeof (session_connect_msg_t) <= SESSION_CTRL_MSG_MAX_SIZE,
  	       "msg too large");
  
  typedef struct session_connect_uri_msg_
  {
    u32 client_index;
    u32 context;
    u8 uri[56];
  } __clib_packed session_connect_uri_msg_t;
  
  STATIC_ASSERT (sizeof (session_connect_uri_msg_t) <=
  	       SESSION_CTRL_MSG_MAX_SIZE, "msg too large");
  
  typedef struct session_connected_msg_
  {
    u32 context;
    i32 retval;
    u64 handle;
    uword server_rx_fifo;
    uword server_tx_fifo;
    u64 segment_handle;
    uword ct_rx_fifo;
    uword ct_tx_fifo;
    u64 ct_segment_handle;
    uword vpp_event_queue_address;
    u32 segment_size;
    u8 segment_name_length;
    u8 segment_name[64];
    transport_endpoint_t lcl;
  } __clib_packed session_connected_msg_t;
  
  typedef struct session_disconnect_msg_
  {
    u32 client_index;
    u32 context;
    session_handle_t handle;
  } __clib_packed session_disconnect_msg_t;
  
  typedef struct session_disconnected_msg_
  {
    u32 client_index;
    u32 context;
    u64 handle;
  } __clib_packed session_disconnected_msg_t;
  
  typedef struct session_disconnected_reply_msg_
  {
    u32 context;
    i32 retval;
    u64 handle;
  } __clib_packed session_disconnected_reply_msg_t;
  
  typedef struct session_reset_msg_
  {
    u32 client_index;
    u32 context;
    u64 handle;
  } __clib_packed session_reset_msg_t;
  
  typedef struct session_reset_reply_msg_
  {
    u32 context;
    i32 retval;
    u64 handle;
  } __clib_packed session_reset_reply_msg_t;
  
  typedef struct session_req_worker_update_msg_
  {
    u64 session_handle;
  } __clib_packed session_req_worker_update_msg_t;
  
  /* NOTE: using u16 for wrk indices because message needs to fit in 18B */
  typedef struct session_worker_update_msg_
  {
    u32 client_index;
    u16 wrk_index;
    u16 req_wrk_index;
    u64 handle;
  } __clib_packed session_worker_update_msg_t;
  
  typedef struct session_worker_update_reply_msg_
  {
    u64 handle;
    uword rx_fifo;
    uword tx_fifo;
    u64 segment_handle;
  } __clib_packed session_worker_update_reply_msg_t;
  
  typedef struct session_app_detach_msg_
  {
    u32 client_index;
    u32 context;
  } session_app_detach_msg_t;
  
  typedef struct app_map_another_segment_msg_
  {
    u32 client_index;
    u32 context;
    u8 fd_flags;
    u32 segment_size;
    u8 segment_name[128];
    u64 segment_handle;
  } session_app_add_segment_msg_t;
  
  typedef struct app_unmap_segment_msg_
  {
    u32 client_index;
    u32 context;
    u64 segment_handle;
  } session_app_del_segment_msg_t;
  
  typedef struct session_migrate_msg_
  {
    uword vpp_evt_q;
    session_handle_t handle;
    session_handle_t new_handle;
    u32 vpp_thread_index;
  } __clib_packed session_migrated_msg_t;
  
  typedef struct session_cleanup_msg_
  {
    session_handle_t handle;
    u8 type;
  } __clib_packed session_cleanup_msg_t;
  
  typedef struct session_app_wrk_rpc_msg_
  {
    u32 client_index;	/**< app client index */
    u32 wrk_index;	/**< dst worker index */
    u8 data[64];		/**< rpc data */
  } __clib_packed session_app_wrk_rpc_msg_t;
  
  typedef struct app_session_event_
  {
    svm_msg_q_msg_t msg;
    session_event_t *evt;
  } __clib_packed app_session_evt_t;
  
  static inline void
  app_alloc_ctrl_evt_to_vpp (svm_msg_q_t * mq, app_session_evt_t * app_evt,
  			   u8 evt_type)
  {
    svm_msg_q_lock_and_alloc_msg_w_ring (mq,
  				       SESSION_MQ_CTRL_EVT_RING,
  				       SVM_Q_WAIT, &app_evt->msg);
    app_evt->evt = svm_msg_q_msg_data (mq, &app_evt->msg);
    clib_memset (app_evt->evt, 0, sizeof (*app_evt->evt));
    app_evt->evt->event_type = evt_type;
  }
  
  static inline void
  app_send_ctrl_evt_to_vpp (svm_msg_q_t * mq, app_session_evt_t * app_evt)
  {
    svm_msg_q_add_and_unlock (mq, &app_evt->msg);
  }
  
  /**
   * Send fifo io event to vpp worker thread
   *
   * Because there may be multiple writers to one of vpp's queues, this
   * protects message allocation and enqueueing.
   *
   * @param mq		vpp message queue
   * @param f		fifo for which the event is sent
   * @param evt_type	type of event
   * @param noblock	flag to indicate is request is blocking or not
   * @return		0 if success, negative integer otherwise
   */
  static inline int
  app_send_io_evt_to_vpp (svm_msg_q_t * mq, u32 session_index, u8 evt_type,
  			u8 noblock)
  {
    session_event_t *evt;
    svm_msg_q_msg_t msg;
  
    if (noblock)
      {
        if (svm_msg_q_try_lock (mq))
  	return -1;
        if (PREDICT_FALSE (svm_msg_q_ring_is_full (mq, SESSION_MQ_IO_EVT_RING)))
  	{
  	  svm_msg_q_unlock (mq);
  	  return -2;
  	}
        msg = svm_msg_q_alloc_msg_w_ring (mq, SESSION_MQ_IO_EVT_RING);
        evt = (session_event_t *) svm_msg_q_msg_data (mq, &msg);
        evt->session_index = session_index;
        evt->event_type = evt_type;
        svm_msg_q_add_and_unlock (mq, &msg);
        return 0;
      }
    else
      {
        svm_msg_q_lock (mq);
        while (svm_msg_q_ring_is_full (mq, SESSION_MQ_IO_EVT_RING)
  	     || svm_msg_q_is_full (mq))
  	svm_msg_q_wait (mq);
        msg = svm_msg_q_alloc_msg_w_ring (mq, SESSION_MQ_IO_EVT_RING);
        evt = (session_event_t *) svm_msg_q_msg_data (mq, &msg);
        evt->session_index = session_index;
        evt->event_type = evt_type;
        svm_msg_q_add_and_unlock (mq, &msg);
        return 0;
      }
  }
  
  always_inline int
  app_send_dgram_raw (svm_fifo_t * f, app_session_transport_t * at,
  		    svm_msg_q_t * vpp_evt_q, u8 * data, u32 len, u8 evt_type,
  		    u8 do_evt, u8 noblock)
  {
    u32 max_enqueue, actual_write;
    session_dgram_hdr_t hdr;
    int rv;
  
    max_enqueue = svm_fifo_max_enqueue_prod (f);
    if (max_enqueue < (sizeof (session_dgram_hdr_t) + len))
      return 0;
  
    max_enqueue -= sizeof (session_dgram_hdr_t);
    actual_write = clib_min (len, max_enqueue);
    hdr.data_length = actual_write;
    hdr.data_offset = 0;
    clib_memcpy_fast (&hdr.rmt_ip, &at->rmt_ip, sizeof (ip46_address_t));
    hdr.is_ip4 = at->is_ip4;
    hdr.rmt_port = at->rmt_port;
    clib_memcpy_fast (&hdr.lcl_ip, &at->lcl_ip, sizeof (ip46_address_t));
    hdr.lcl_port = at->lcl_port;
    rv = svm_fifo_enqueue (f, sizeof (hdr), (u8 *) & hdr);
    ASSERT (rv == sizeof (hdr));
  
    rv = svm_fifo_enqueue (f, actual_write, data);
    if (do_evt)
      {
        if (rv > 0 && svm_fifo_set_event (f))
  	app_send_io_evt_to_vpp (vpp_evt_q, f->master_session_index, evt_type,
  				noblock);
      }
    ASSERT (rv);
    return rv;
  }
  
  always_inline int
  app_send_dgram (app_session_t * s, u8 * data, u32 len, u8 noblock)
  {
    return app_send_dgram_raw (s->tx_fifo, &s->transport, s->vpp_evt_q, data,
  			     len, SESSION_IO_EVT_TX, 1 /* do_evt */ ,
  			     noblock);
  }
  
  always_inline int
  app_send_stream_raw (svm_fifo_t * f, svm_msg_q_t * vpp_evt_q, u8 * data,
  		     u32 len, u8 evt_type, u8 do_evt, u8 noblock)
  {
    int rv;
  
    rv = svm_fifo_enqueue (f, len, data);
    if (do_evt)
      {
        if (rv > 0 && svm_fifo_set_event (f))
  	app_send_io_evt_to_vpp (vpp_evt_q, f->master_session_index, evt_type,
  				noblock);
      }
    return rv;
  }
  
  always_inline int
  app_send_stream (app_session_t * s, u8 * data, u32 len, u8 noblock)
  {
    return app_send_stream_raw (s->tx_fifo, s->vpp_evt_q, data, len,
  			      SESSION_IO_EVT_TX, 1 /* do_evt */ , noblock);
  }
  
  always_inline int
  app_send (app_session_t * s, u8 * data, u32 len, u8 noblock)
  {
    if (s->is_dgram)
      return app_send_dgram (s, data, len, noblock);
    return app_send_stream (s, data, len, noblock);
  }
  
  always_inline int
  app_recv_dgram_raw (svm_fifo_t * f, u8 * buf, u32 len,
  		    app_session_transport_t * at, u8 clear_evt, u8 peek)
  {
    session_dgram_pre_hdr_t ph;
    u32 max_deq;
    int rv;
  
    max_deq = svm_fifo_max_dequeue_cons (f);
    if (max_deq <= sizeof (session_dgram_hdr_t))
      {
        if (clear_evt)
  	svm_fifo_unset_event (f);
        return 0;
      }
  
    if (clear_evt)
      svm_fifo_unset_event (f);
  
    svm_fifo_peek (f, 0, sizeof (ph), (u8 *) & ph);
    ASSERT (ph.data_length >= ph.data_offset);
  
    /* Check if we have the full dgram */
    if (max_deq < (ph.data_length + SESSION_CONN_HDR_LEN)
        && len >= ph.data_length)
      return 0;
  
    svm_fifo_peek (f, sizeof (ph), sizeof (*at), (u8 *) at);
    len = clib_min (len, ph.data_length - ph.data_offset);
    rv = svm_fifo_peek (f, ph.data_offset + SESSION_CONN_HDR_LEN, len, buf);
    if (peek)
      return rv;
  
    /* Discards data that did not fit in buffer */
    svm_fifo_dequeue_drop (f, ph.data_length + SESSION_CONN_HDR_LEN);
  
    return rv;
  }
  
  always_inline int
  app_recv_dgram (app_session_t * s, u8 * buf, u32 len)
  {
    return app_recv_dgram_raw (s->rx_fifo, buf, len, &s->transport, 1, 0);
  }
  
  always_inline int
  app_recv_stream_raw (svm_fifo_t * f, u8 * buf, u32 len, u8 clear_evt, u8 peek)
  {
    if (clear_evt)
      svm_fifo_unset_event (f);
  
    if (peek)
      return svm_fifo_peek (f, 0, len, buf);
  
    return svm_fifo_dequeue (f, len, buf);
  }
  
  always_inline int
  app_recv_stream (app_session_t * s, u8 * buf, u32 len)
  {
    return app_recv_stream_raw (s->rx_fifo, buf, len, 1, 0);
  }
  
  always_inline int
  app_recv (app_session_t * s, u8 * data, u32 len)
  {
    if (s->is_dgram)
      return app_recv_dgram (s, data, len);
    return app_recv_stream (s, data, len);
  }
  
  /* *INDENT-OFF* */
  static char *session_error_str[] = {
  #define _(sym, str) str,
      foreach_session_error
  #undef _
  };
  /* *INDENT-ON* */
  
  static inline u8 *
  format_session_error (u8 * s, va_list * args)
  {
    session_error_t error = va_arg (*args, session_error_t);
    if (-error >= 0 && -error < SESSION_N_ERRORS)
      s = format (s, "%s", session_error_str[-error]);
    else
      s = format (s, "invalid session err %u", -error);
    return s;
  }
  #endif /* __included_uri_h__ */
  
  /*
   * fd.io coding-style-patch-verification: ON
   *
   * Local Variables:
   * eval: (c-set-style "gnu")
   * End:
   */
  