1/******************************************************************************
2 *
3 *  Copyright 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 "btif/include/btif_debug_conn.h"
24#include "osi/include/time.h"
25
26#define NUM_CONNECTION_EVENTS 16
27#define TEMP_BUFFER_SIZE 30
28
29typedef struct conn_event_t {
30  uint64_t ts;
31  btif_debug_conn_state_t state;
32  RawAddress bda;
33  tGATT_DISCONN_REASON disconnect_reason;
34} conn_event_t;
35
36static conn_event_t connection_events[NUM_CONNECTION_EVENTS];
37static uint8_t current_event = 0;
38
39static char* format_ts(const uint64_t ts, char* buffer, int len) {
40  const uint64_t ms = ts / 1000;
41  const time_t secs = ms / 1000;
42  struct tm* ptm = localtime(&secs);
43
44  char tempbuff[20];
45  strftime(tempbuff, sizeof(tempbuff), "%m-%d %H:%M:%S", ptm);
46  snprintf(buffer, len, "%s.%03u", tempbuff, (uint16_t)(ms % 1000));
47
48  return buffer;
49}
50
51static const 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) current_event = 0;
64}
65
66void btif_debug_conn_state(const RawAddress& bda,
67                           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 = time_gettimeofday_us();
73  evt->state = state;
74  evt->disconnect_reason = disconnect_reason;
75  evt->bda = bda;
76}
77
78void btif_debug_conn_dump(int fd) {
79  const uint8_t current_event_local =
80      current_event;  // Cache to avoid threading issues
81  uint8_t dump_event = current_event_local;
82  char ts_buffer[TEMP_BUFFER_SIZE] = {0};
83
84  dprintf(fd, "\nConnection Events:\n");
85  if (connection_events[dump_event].ts == 0) dprintf(fd, "  None\n");
86
87  while (connection_events[dump_event].ts) {
88    conn_event_t* evt = &connection_events[dump_event];
89    dprintf(fd, "  %s %s %s", format_ts(evt->ts, ts_buffer, sizeof(ts_buffer)),
90            format_state(evt->state), evt->bda.ToString().c_str());
91    if (evt->state == BTIF_DEBUG_DISCONNECTED)
92      dprintf(fd, " reason=%d", evt->disconnect_reason);
93    dprintf(fd, "\n");
94
95    // Go to previous event; wrap if needed
96    if (dump_event > 0)
97      --dump_event;
98    else
99      dump_event = NUM_CONNECTION_EVENTS - 1;
100
101    // Check if we dumped all events
102    if (dump_event == current_event_local) break;
103  }
104}
105