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rmc_sub_write.c
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/
rmc_sub_write.c
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// Copyright (C) 2018, Jaguar Land Rover
// This program is licensed under the terms and conditions of the
// Mozilla Public License, version 2.0. The full text of the
// Mozilla Public License is at https://www.mozilla.org/MPL/2.0/
//
// Author: Magnus Feuer (mfeuer1@jaguarlandrover.com)
#include "rmc_internal.h"
#include "rmc_log.h"
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <arpa/inet.h>
#include <assert.h>
// FIXME: If we see timed out (== lost) packets from subscribers, we should
// switch them to TCP for a period of time in order
// to use TCP's flow control until congestion has eased.
// =============
// SOCKET WRITE
// =============
int rmc_sub_write_interval_acknowledgement(rmc_sub_context_t* ctx,
rmc_connection_t* conn,
sub_pid_interval_t* interval)
{
ssize_t res = 0;
uint8_t *seg1 = 0;
uint32_t seg1_len = 0;
uint8_t *seg2 = 0;
uint32_t seg2_len = 0;
cmd_ack_interval_t ack = {
.first_pid = interval->first_pid,
.last_pid = interval->last_pid
};
uint32_t available = 0;
rmc_poll_action_t old_action = 0;
char group_addr[80];
char remote_addr[80];
if (!ctx || !conn || !interval)
return EINVAL;
if (conn->mode != RMC_CONNECTION_MODE_CONNECTED)
return ENOTCONN;
available = circ_buf_available(&conn->write_buf);
old_action = conn->action;
strcpy(group_addr, inet_ntoa( (struct in_addr) { .s_addr = htonl(ctx->mcast_group_addr) }));
strcpy(remote_addr, inet_ntoa( (struct in_addr) { .s_addr = htonl(conn->remote_address) }));
RMC_LOG_INDEX_COMMENT(conn->connection_index,
"interval[%lu:%lu] mcast[%s:%d] remote[%s:%d]",
interval->first_pid,
interval->last_pid,
group_addr,
ctx->mcast_port,
remote_addr,
conn->remote_port);
if (available < 1 + sizeof(ack)) {
RMC_LOG_INDEX_WARNING(conn->connection_index,
"Out of circ buf memory sending ack: interval[%lu:%lu] mcast[%s:%d] remote[%s:%d]",
interval->first_pid,
interval->last_pid,
group_addr,
ctx->mcast_port,
remote_addr,
conn->remote_port);
return ENOMEM;
}
// Allocate memory for command
res = circ_buf_alloc(&conn->write_buf, 1,
&seg1, &seg1_len,
&seg2, &seg2_len);
if (res) {
RMC_LOG_INDEX_ERROR(conn->connection_index,
"Out of circ buf memory setting up ack command: interval[%lu:%lu] mcast[%s:%d] remote[%s:%d]",
interval->first_pid,
interval->last_pid,
group_addr,
ctx->mcast_port,
remote_addr,
conn->remote_port);
return ENOMEM;
}
*seg1 = RMC_CMD_ACK_INTERVAL;
// Allocate memory for packet header
res = circ_buf_alloc(&conn->write_buf, sizeof(ack) ,
&seg1, &seg1_len,
&seg2, &seg2_len);
if (res) {
RMC_LOG_INDEX_ERROR(conn->connection_index,
"Out of circ buf memory setting up ack header: interval[%lu:%lu] mcast[%s:%d] remote[%s:%d]",
interval->first_pid,
interval->last_pid,
group_addr,
ctx->mcast_port,
remote_addr,
conn->remote_port);
return ENOMEM;
}
// Copy in packet header
memcpy(seg1, (uint8_t*) &ack, seg1_len);
if (seg2_len)
memcpy(seg2, ((uint8_t*) &ack) + seg1_len, seg2_len);
// We always want to read from the tcp socket.
conn->action |= RMC_POLLWRITE;
if (ctx->conn_vec.poll_modify)
(*ctx->conn_vec.poll_modify)(ctx->user_data,
conn->descriptor,
conn->connection_index,
old_action,
conn->action);
return 0;
}
int rmc_sub_write_control_message(rmc_sub_context_t* ctx,
rmc_connection_t* conn,
void* payload,
payload_len_t payload_len)
{
ssize_t res = 0;
uint8_t *seg1 = 0;
uint32_t seg1_len = 0;
uint8_t *seg2 = 0;
uint32_t seg2_len = 0;
cmd_control_message_t msg = {
.payload_len = payload_len,
};
uint32_t available = 0;
rmc_poll_action_t old_action = 0;
if (!ctx || !conn || !payload || !payload_len)
return EINVAL;
if (conn->mode != RMC_CONNECTION_MODE_CONNECTED) {
RMC_LOG_INDEX_WARNING(conn->connection_index, "Socket not connected. [%d] Cannot write control message.",
conn->mode);
return ENOTCONN;
}
available = circ_buf_available(&conn->write_buf);
if (available < 1 + sizeof(cmd_control_message_t) + payload_len + 1) {
RMC_LOG_INDEX_WARNING(conn->connection_index, "Out of circ buf memory sending ctl message");
return ENOMEM;
}
old_action = conn->action;
// Allocate memory for command
res = circ_buf_alloc(&conn->write_buf, 1,
&seg1, &seg1_len,
&seg2, &seg2_len);
if (res) {
RMC_LOG_INDEX_ERROR(conn->connection_index,
"Out of circ buf memory setting up ctl message cmd command");
return ENOMEM;
}
*seg1 = RMC_CMD_CONTROL_MESSAGE;
// Allocate memory for packet header
res = circ_buf_alloc(&conn->write_buf, sizeof(msg) ,
&seg1, &seg1_len,
&seg2, &seg2_len);
if (res) {
RMC_LOG_INDEX_ERROR(conn->connection_index,
"Out of circ buf memory setting up ctl message cmd header");
return ENOMEM;
}
// Copy in packet header
memcpy(seg1, (uint8_t*) &msg, seg1_len);
if (seg2_len)
memcpy(seg2, ((uint8_t*) &msg) + seg1_len, seg2_len);
// Allocate memory for payload
res = circ_buf_alloc(&conn->write_buf, payload_len ,
&seg1, &seg1_len,
&seg2, &seg2_len);
if (res) {
RMC_LOG_INDEX_ERROR(conn->connection_index,
"Out of circ buf memory setting up ctl message payload");
return ENOMEM;
}
// Copy in packet header
memcpy(seg1, (uint8_t*) payload, seg1_len);
if (seg2_len)
memcpy(seg2, ((uint8_t*) &payload) + seg1_len, seg2_len);
// We always want to read from the tcp socket.
conn->action |= RMC_POLLWRITE;
if (ctx->conn_vec.poll_modify)
(*ctx->conn_vec.poll_modify)(ctx->user_data,
conn->descriptor,
conn->connection_index,
old_action,
conn->action);
RMC_LOG_INDEX_DEBUG(conn->connection_index, "Sent %d bytes as control message to publisher.", payload_len);
return 0;
}
int rmc_sub_write_control_message_by_address(rmc_sub_context_t* ctx,
uint32_t remote_address,
uint16_t remote_port,
void* payload,
payload_len_t payload_len)
{
rmc_connection_t* conn = 0;
if (!ctx || !payload || !payload_len)
return EINVAL;
conn = rmc_conn_find_by_address(&ctx->conn_vec, remote_address, remote_port);
if (!conn || conn->mode != RMC_CONNECTION_MODE_CONNECTED)
return ENOTCONN;
return rmc_sub_write_control_message(ctx, conn, payload, payload_len);
}
int rmc_sub_write_control_message_by_node_id(rmc_sub_context_t* ctx,
rmc_node_id_t node_id,
void* payload,
payload_len_t payload_len)
{
rmc_connection_t* conn = 0;
if (!ctx || !payload || !payload_len)
return EINVAL;
conn = rmc_conn_find_by_node_id(&ctx->conn_vec, node_id);
if (!conn || conn->mode != RMC_CONNECTION_MODE_CONNECTED)
return ENOTCONN;
return rmc_sub_write_control_message(ctx, conn, payload, payload_len);
}
int rmc_sub_write(rmc_sub_context_t* ctx, rmc_index_t s_ind, uint8_t* op_res)
{
int res = 0;
uint32_t bytes_left_after = 0;
rmc_poll_action_t old_action;
rmc_connection_t* conn = 0;
assert(ctx);
conn = rmc_conn_find_by_index(&ctx->conn_vec, s_ind);
// Is s_ind within our connection vector?
if (!conn) {
if (op_res)
*op_res = RMC_ERROR;
return ENOTCONN;
}
// Is this socket in the process of being connected
if (conn->mode == RMC_CONNECTION_MODE_CONNECTING) {
if (op_res)
*op_res = RMC_COMPLETE_CONNECTION;
sub_init_publisher(&ctx->publishers[s_ind]);
res = rmc_conn_complete_connection(&ctx->conn_vec, conn);
if (res) {
RMC_LOG_INDEX_INFO(s_ind, "Failed to complete connection: %s", strerror(errno));
rmc_conn_close_connection(&ctx->conn_vec, conn->connection_index);
return res;
}
if (ctx->subscription_complete_cb) {
RMC_LOG_INDEX_DEBUG(s_ind, "Invoking subscription complete callback");
(*ctx->subscription_complete_cb)(ctx, conn->remote_address, conn->remote_port, conn->node_id);
}
return 0;
}
old_action = conn->action;
// Do we have any data to write?
if (circ_buf_in_use(&conn->write_buf) == 0) {
if (op_res)
*op_res = RMC_ERROR;
return ENODATA;
}
if (op_res)
*op_res = RMC_WRITE_TCP;
res = rmc_conn_process_tcp_write(conn, &bytes_left_after);
if (bytes_left_after == 0)
conn->action &= ~RMC_POLLWRITE;
else
conn->action |= RMC_POLLWRITE;
if (ctx->conn_vec.poll_modify)
(*ctx->conn_vec.poll_modify)(ctx->user_data,
conn->descriptor,
s_ind,
old_action,
conn->action);
// Did we encounter an error.
if (res && op_res)
*op_res = RMC_ERROR;
return res;
}