1/******************************************************************************
2 *
3 *  Copyright (C) 2015 Google Inc.
4 *
5 *  Licensed under the Apache License, Version 2.0 (the "License");
6 *  you may not use this file except in compliance with the License.
7 *  You may obtain a copy of the License at:
8 *
9 *  http://www.apache.org/licenses/LICENSE-2.0
10 *
11 *  Unless required by applicable law or agreed to in writing, software
12 *  distributed under the License is distributed on an "AS IS" BASIS,
13 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 *  See the License for the specific language governing permissions and
15 *  limitations under the License.
16 *
17 ******************************************************************************/
18
19#include <stdio.h>
20#include <string.h>
21#include <time.h>
22
23#include "btcore/include/bdaddr.h"
24#include "btif/include/btif_debug.h"
25#include "btif/include/btif_debug_conn.h"
26
27#define NUM_CONNECTION_EVENTS  16
28#define TEMP_BUFFER_SIZE       30
29
30typedef struct conn_event_t {
31  uint64_t ts;
32  btif_debug_conn_state_t state;
33  bt_bdaddr_t bda;
34  tGATT_DISCONN_REASON disconnect_reason;
35} conn_event_t;
36
37static conn_event_t connection_events[NUM_CONNECTION_EVENTS];
38static uint8_t current_event = 0;
39
40static char *format_ts(const uint64_t ts, char *buffer, int len) {
41  const uint64_t ms = ts / 1000;
42  const time_t secs = ms / 1000;
43  struct tm *ptm = localtime(&secs);
44
45  strftime(buffer, len, "%m-%d %H:%M:%S.%%03u", ptm);
46  snprintf(buffer, len, buffer, (uint16_t)(ms % 1000));
47
48  return buffer;
49}
50
51static char *format_state(const btif_debug_conn_state_t state) {
52  switch (state) {
53    case BTIF_DEBUG_CONNECTED:
54      return "CONNECTED   ";
55    case BTIF_DEBUG_DISCONNECTED:
56      return "DISCONNECTED";
57  }
58  return "UNKNOWN";
59}
60
61static void next_event() {
62  ++current_event;
63  if (current_event == NUM_CONNECTION_EVENTS)
64    current_event = 0;
65}
66
67void btif_debug_conn_state(const bt_bdaddr_t bda, const btif_debug_conn_state_t state,
68    const tGATT_DISCONN_REASON disconnect_reason) {
69  next_event();
70
71  conn_event_t *evt = &connection_events[current_event];
72  evt->ts = btif_debug_ts();
73  evt->state = state;
74  evt->disconnect_reason = disconnect_reason;
75  memcpy(&evt->bda, &bda, sizeof(bt_bdaddr_t));
76}
77
78void btif_debug_conn_dump(int fd) {
79  const uint8_t current_event_local = current_event; // Cache to avoid threading issues
80  uint8_t dump_event = current_event_local;
81  char ts_buffer[TEMP_BUFFER_SIZE] = {0};
82  char name_buffer[TEMP_BUFFER_SIZE] = {0};
83
84  dprintf(fd, "\nConnection Events:\n");
85  if (connection_events[dump_event].ts == 0)
86    dprintf(fd, "  None\n");
87
88  while (connection_events[dump_event].ts) {
89    conn_event_t *evt = &connection_events[dump_event];
90    dprintf(fd, "  %s %s %s",
91            format_ts(evt->ts, ts_buffer, sizeof(ts_buffer)),
92            format_state(evt->state),
93            bdaddr_to_string(&evt->bda, name_buffer, sizeof(name_buffer))
94        );
95    if (evt->state == BTIF_DEBUG_DISCONNECTED)
96      dprintf(fd, " reason=%d", evt->disconnect_reason);
97    dprintf(fd,"\n");
98
99    // Go to previous event; wrap if needed
100    if (dump_event > 0)
101      --dump_event;
102    else
103      dump_event = NUM_CONNECTION_EVENTS - 1;
104
105    // Check if we dumped all events
106    if (dump_event == current_event_local)
107      break;
108  }
109}
110