GNUNET_PSYC_CHANNEL_RESTRICTED_HISTORY = 1 << 1
};
+
/**
* PSYC channel policies.
*/
/**
* Request from slave to master.
*/
- GNUNET_PSYC_MESSAGE_REQUEST = 1 << 1
+ GNUNET_PSYC_MESSAGE_REQUEST = 1 << 1,
+
+ /**
+ * Message can be delivered out of order.
+ */
+ GNUNET_PSYC_MESSAGE_ORDER_ANY = 1 << 2
+};
+
+
+/**
+ * Values for the @a state_delta field of GNUNET_PSYC_MessageHeader.
+ */
+enum GNUNET_PSYC_StateDeltaValues
+{
+ GNUNET_PSYC_STATE_RESET = 0,
+
+ GNUNET_PSYC_STATE_NOT_MODIFIED = UINT64_MAX
};
+
GNUNET_NETWORK_STRUCT_BEGIN
/**
* Header of a PSYC message.
+ *
+ * Only present when receiving a message.
*/
struct GNUNET_PSYC_MessageHeader
{
/**
* Number of the message this message part belongs to.
+ * Monotonically increasing from 1.
*/
uint64_t message_id GNUNET_PACKED;
*/
uint32_t flags GNUNET_PACKED;
+ /**
+ * Number of message IDs since the last message that contained state
+ * operations. @see enum GNUNET_PSYC_StateDeltaValues
+ */
+ uint64_t state_delta GNUNET_PACKED;
+
/* Followed by NUL-terminated method name. */
};
GNUNET_NETWORK_STRUCT_END
+
#define GNUNET_PSYC_MODIFIER_MAX_PAYLOAD \
GNUNET_MULTICAST_FRAGMENT_MAX_PAYLOAD \
- sizeof (struct GNUNET_PSYC_MessageModifier)
GNUNET_MULTICAST_FRAGMENT_MAX_PAYLOAD \
- sizeof (struct GNUNET_MessageHeader)
+
/**
* Handle that identifies a join request.
*
/**
* Method called from PSYC upon receiving part of a message.
*
- * @param cls Closure.
- * @param msg Message part, one of the following types:
+ * @param cls Closure.
+ * @param message_id Sequence number of the message.
+ * @param flags OR'ed GNUNET_PSYC_MessageFlags
+ * @param msg Message part, one of the following types:
* - GNUNET_MESSAGE_TYPE_PSYC_MESSAGE_HEADER
* - GNUNET_MESSAGE_TYPE_PSYC_MESSAGE_METHOD
* - GNUNET_MESSAGE_TYPE_PSYC_MESSAGE_MODIFIER
/**
* Method called from PSYC upon receiving a join request.
*
- * @param cls Closure.
- * @param slave requesting to join.
- * @param method_name Method name in the join request.
- * @param variable_count Number of elements in the @a variables array.
- * @param variables Transient variables for the join request.
- * @param data Data stream given to the method (might not be zero-terminated
- * if data is binary).
- * @param data_size Number of bytes in @a data.
- * @param jh Join handle to use with GNUNET_PSYC_join_decision()
+ * @param cls Closure.
+ * @param slave_key Public key of the slave requesting join.
+ * @param join_msg Join message sent along with the request.
+ * @param jh Join handle to use with GNUNET_PSYC_join_decision()
*/
typedef void
-(*GNUNET_PSYC_JoinCallback) (void *cls,
- const struct GNUNET_CRYPTO_EddsaPublicKey
- *slave_key,
- const char *method_name,
- size_t variable_count,
- const struct GNUNET_ENV_Modifier *variables,
- const void *data,
- size_t data_size,
- struct GNUNET_PSYC_JoinHandle *jh);
+(*GNUNET_PSYC_JoinRequestCallback) (void *cls,
+ const struct
+ GNUNET_CRYPTO_EddsaPublicKey *slave_key,
+ const struct
+ GNUNET_PSYC_MessageHeader *join_msg,
+ struct GNUNET_PSYC_JoinHandle *jh);
/**
* Must be called once and only once in response to an invocation of the
* #GNUNET_PSYC_JoinCallback.
*
- * @param jh Join request handle.
- * @param is_admitted #GNUNET_YES if joining is approved,
- * #GNUNET_NO if it is disapproved.
- * @param relay_count Number of relays given.
- * @param relays Array of suggested peers that might be useful relays to use
+ * @param jh Join request handle.
+ * @param is_admitted #GNUNET_YES if the join is approved,
+ * #GNUNET_NO if it is disapproved,
+ * #GNUNET_SYSERR if we cannot answer the request.
+ * @param relay_count Number of relays given.
+ * @param relays Array of suggested peers that might be useful relays to use
* when joining the multicast group (essentially a list of peers that
* are already part of the multicast group and might thus be willing
* to help with routing). If empty, only this local peer (which must
* be the multicast origin) is a good candidate for building the
* multicast tree. Note that it is unnecessary to specify our own
* peer identity in this array.
- * @param method_name Method name for the message transmitted with the response.
- * @param env Environment containing transient variables for the message,
- * or NULL.
- * @param data Data of the message.
- * @param data_size Size of @a data.
+ * @param join_resp Application-dependent join response message to send along
+ * with the decision.
+ *
+ * @return #GNUNET_OK on success,
+ * #GNUNET_SYSERR if @a join_resp is too large.
*/
-void
+int
GNUNET_PSYC_join_decision (struct GNUNET_PSYC_JoinHandle *jh,
int is_admitted,
uint32_t relay_count,
const struct GNUNET_PeerIdentity *relays,
- const char *method_name,
- const struct GNUNET_ENV_Environment *env,
- const void *data,
- size_t data_size);
+ const struct GNUNET_PSYC_MessageHeader *join_resp);
/**
* Function called after the channel master started.
*
* @param cls Closure.
- * @param last_message_id Last message ID sent to the channel.
+ * @param max_message_id Last message ID sent to the channel.
*/
typedef void
(*GNUNET_PSYC_MasterStartCallback) (void *cls, uint64_t max_message_id);
* or part messages, the respective methods must call other PSYC functions to
* inform PSYC about the meaning of the respective events.
*
- * @param cfg Configuration to use (to connect to PSYC service).
- * @param channel_key ECC key that will be used to sign messages for this
+ * @param cfg Configuration to use (to connect to PSYC service).
+ * @param channel_key ECC key that will be used to sign messages for this
* PSYC session. The public key is used to identify the PSYC channel.
* Note that end-users will usually not use the private key directly, but
* rather look it up in GNS for places managed by other users, or select
* a file with the private key(s) when setting up their own channels
* FIXME: we'll likely want to use NOT the p521 curve here, but a cheaper
* one in the future.
- * @param policy Channel policy specifying join and history restrictions.
+ * @param policy Channel policy specifying join and history restrictions.
* Used to automate join decisions.
- * @param message_cb Function to invoke on message parts received from slaves.
- * @param join_cb Function to invoke when a peer wants to join.
- * @param master_started_cb Function to invoke after the channel master started.
- * @param cls Closure for @a method and @a join_cb.
+ * @param master_start_cb Function to invoke after the channel master started.
+ * @param join_request_cb Function to invoke when a slave wants to join.
+ * @param message_cb Function to invoke on message parts sent to the channel
+ * and received from slaves
+ * @param cls Closure for @a method and @a join_cb.
+ *
* @return Handle for the channel master, NULL on error.
*/
struct GNUNET_PSYC_Master *
GNUNET_PSYC_master_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
const struct GNUNET_CRYPTO_EddsaPrivateKey *channel_key,
enum GNUNET_PSYC_Policy policy,
+ GNUNET_PSYC_MasterStartCallback master_start_cb,
+ GNUNET_PSYC_JoinRequestCallback join_request_cb,
GNUNET_PSYC_MessageCallback message_cb,
- GNUNET_PSYC_JoinCallback join_cb,
- GNUNET_PSYC_MasterStartCallback master_started_cb,
void *cls);
* Only needed during the first call to this callback at the beginning
* of the modifier. In case of subsequent calls asking for value
* continuations @a oper is set to #NULL.
- * @param[out] value_size Where to write the full size of the value.
+ * @param[out] full_value_size Where to write the full size of the value.
* Only needed during the first call to this callback at the beginning
* of the modifier. In case of subsequent calls asking for value
* continuations @a value_size is set to #NULL.
uint16_t *data_size,
void *data,
uint8_t *oper,
- uint32_t *value_size);
+ uint32_t *full_value_size);
/**
* Flags for transmitting messages to a channel by the master.
enum GNUNET_PSYC_MasterTransmitFlags
{
GNUNET_PSYC_MASTER_TRANSMIT_NONE = 0,
+
/**
* Whether this message should reset the channel state,
* i.e. remove all previously stored state variables.
*/
- GNUNET_PSYC_MASTER_TRANSMIT_RESET_STATE = 1 << 0,
+
+ GNUNET_PSYC_MASTER_TRANSMIT_STATE_RESET = 1 << 0,
/**
- * Whether we need to increment the group generation counter after
- * transmitting this message.
+ * Whether this message contains any state modifiers.
*/
- GNUNET_PSYC_MASTER_TRANSMIT_INC_GROUP_GEN = 1 << 1,
+ GNUNET_PSYC_MASTER_TRANSMIT_STATE_MODIFY = 1 << 1,
/**
* Add PSYC header variable with the hash of the current channel state.
*/
- GNUNET_PSYC_MASTER_TRANSMIT_ADD_STATE_HASH = 1 << 2
+ GNUNET_PSYC_MASTER_TRANSMIT_STATE_HASH = 1 << 2,
+
+ /**
+ * Whether we need to increment the group generation counter after
+ * transmitting this message.
+ */
+ GNUNET_PSYC_MASTER_TRANSMIT_INC_GROUP_GEN = 1 << 3
};
/**
- * Function called after the slave joined.
+ * Function called after the slave connected to the PSYC service.
*
* @param cls Closure.
* @param max_message_id Last message ID sent to the channel.
*/
typedef void
-(*GNUNET_PSYC_SlaveJoinCallback) (void *cls, uint64_t max_message_id);
+(*GNUNET_PSYC_SlaveConnectCallback) (void *cls, uint64_t max_message_id);
+
+
+/**
+ * Method called to inform about the decision in response to a join request.
+ *
+ * If @a is_admitted is not #GNUNET_YES, then sending messages to the channel is
+ * not possible, but earlier history can be still queried.
+ *
+ * @param cls Closure.
+ * @param is_admitted #GNUNET_YES or #GNUNET_NO or #GNUNET_SYSERR
+ * @param join_msg Application-dependent join message from the origin.
+ */
+typedef void
+(*GNUNET_PSYC_JoinDecisionCallback) (void *cls,
+ int is_admitted,
+ const struct
+ GNUNET_PSYC_MessageHeader *join_msg);
/**
* notification on failure (as the channel may simply take days to approve,
* and disapproval is simply being ignored).
*
- * @param cfg Configuration to use.
- * @param channel_key ECC public key that identifies the channel we wish to join.
- * @param slave_key ECC private-public key pair that identifies the slave, and
+ * @param cfg Configuration to use.
+ * @param channel_key ECC public key that identifies the channel we wish to join.
+ * @param slave_key ECC private-public key pair that identifies the slave, and
* used by multicast to sign the join request and subsequent unicast
* requests sent to the master.
- * @param origin Peer identity of the origin.
- * @param relay_count Number of peers in the @a relays array.
- * @param relays Peer identities of members of the multicast group, which serve
+ * @param origin Peer identity of the origin.
+ * @param relay_count Number of peers in the @a relays array.
+ * @param relays Peer identities of members of the multicast group, which serve
* as relays and used to join the group at.
- * @param message_cb Function to invoke on message parts received from the
+ * @param message_cb Function to invoke on message parts received from the
* channel, typically at least contains method handlers for @e join and
* @e part.
- * @param join_cb function invoked once we have joined with the current
- * message ID of the channel
- * @param slave_joined_cb Function to invoke when a peer wants to join.
- * @param cls Closure for @a message_cb and @a slave_joined_cb.
- * @param method_name Method name for the join request.
- * @param env Environment containing transient variables for the request, or NULL.
- * @param data Payload for the join message.
- * @param data_size Number of bytes in @a data.
+ * @param slave_connect_cb Function invoked once we have connected to the
+ * PSYC service.
+ * @param join_decision_cb Function invoked once we have received a join
+ * decision.
+ * @param cls Closure for @a message_cb and @a slave_joined_cb.
+ * @param method_name Method name for the join request.
+ * @param env Environment containing transient variables for the request, or NULL.
+ * @param data Payload for the join message.
+ * @param data_size Number of bytes in @a data.
+ *
* @return Handle for the slave, NULL on error.
*/
struct GNUNET_PSYC_Slave *
uint32_t relay_count,
const struct GNUNET_PeerIdentity *relays,
GNUNET_PSYC_MessageCallback message_cb,
- GNUNET_PSYC_JoinCallback join_cb,
- GNUNET_PSYC_SlaveJoinCallback slave_joined_cb,
+ GNUNET_PSYC_SlaveConnectCallback slave_connect_cb,
+ GNUNET_PSYC_JoinDecisionCallback join_decision_cb,
void *cls,
const char *method_name,
const struct GNUNET_ENV_Environment *env,