summaryrefslogtreecommitdiffstats
path: root/aclk/aclk_query.c
blob: 3e2f88e468b589b681f11562f2749c46a9ab44eb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
// SPDX-License-Identifier: GPL-3.0-or-later

#include "aclk_query.h"
#include "aclk_stats.h"
#include "aclk_query_queue.h"
#include "aclk_tx_msgs.h"

#define ACLK_QUERY_THREAD_NAME "ACLK_Query"

#define WEB_HDR_ACCEPT_ENC "Accept-Encoding:"

pthread_cond_t query_cond_wait = PTHREAD_COND_INITIALIZER;
pthread_mutex_t query_lock_wait = PTHREAD_MUTEX_INITIALIZER;
#define QUERY_THREAD_LOCK pthread_mutex_lock(&query_lock_wait)
#define QUERY_THREAD_UNLOCK pthread_mutex_unlock(&query_lock_wait)

typedef struct aclk_query_handler {
    aclk_query_type_t type;
    char *name; // for logging purposes
    int(*fnc)(mqtt_wss_client client, aclk_query_t query);
} aclk_query_handler;

static int info_metadata(mqtt_wss_client client, aclk_query_t query)
{
    aclk_send_info_metadata(client,
        !query->data.metadata_info.initial_on_connect,
        query->data.metadata_info.host);
    return 0;
}

static int alarms_metadata(mqtt_wss_client client, aclk_query_t query)
{
    aclk_send_alarm_metadata(client,
        !query->data.metadata_info.initial_on_connect);
    return 0;
}

static usec_t aclk_web_api_v1_request(RRDHOST *host, struct web_client *w, char *url)
{
    usec_t t;

    t = now_monotonic_high_precision_usec();
    w->response.code = web_client_api_request_v1(host, w, url);
    t = now_monotonic_high_precision_usec() - t;

    if (aclk_stats_enabled) {
        ACLK_STATS_LOCK;
        aclk_metrics_per_sample.cloud_q_process_total += t;
        aclk_metrics_per_sample.cloud_q_process_count++;
        if (aclk_metrics_per_sample.cloud_q_process_max < t)
            aclk_metrics_per_sample.cloud_q_process_max = t;
        ACLK_STATS_UNLOCK;
    }

    return t;
}

static int http_api_v2(mqtt_wss_client client, aclk_query_t query)
{
    int retval = 0;
    usec_t t;
    BUFFER *local_buffer = NULL;

#ifdef NETDATA_WITH_ZLIB
    int z_ret;
    BUFFER *z_buffer = buffer_create(NETDATA_WEB_RESPONSE_INITIAL_SIZE);
    char *start, *end;
#endif

    struct web_client *w = (struct web_client *)callocz(1, sizeof(struct web_client));
    w->response.data = buffer_create(NETDATA_WEB_RESPONSE_INITIAL_SIZE);
    w->response.header = buffer_create(NETDATA_WEB_RESPONSE_HEADER_SIZE);
    w->response.header_output = buffer_create(NETDATA_WEB_RESPONSE_HEADER_SIZE);
    strcpy(w->origin, "*"); // Simulate web_client_create_on_fd()
    w->cookie1[0] = 0;      // Simulate web_client_create_on_fd()
    w->cookie2[0] = 0;      // Simulate web_client_create_on_fd()
    w->acl = 0x1f;

    char *mysep = strchr(query->data.http_api_v2.query, '?');
    if (mysep) {
        url_decode_r(w->decoded_query_string, mysep, NETDATA_WEB_REQUEST_URL_SIZE + 1);
        *mysep = '\0';
    } else
        url_decode_r(w->decoded_query_string, query->data.http_api_v2.query, NETDATA_WEB_REQUEST_URL_SIZE + 1);

    mysep = strrchr(query->data.http_api_v2.query, '/');

    // execute the query
    t = aclk_web_api_v1_request(localhost, w, mysep ? mysep + 1 : "noop");

#ifdef NETDATA_WITH_ZLIB
    // check if gzip encoding can and should be used
    if ((start = strstr((char *)query->data.http_api_v2.payload, WEB_HDR_ACCEPT_ENC))) {
        start += strlen(WEB_HDR_ACCEPT_ENC);
        end = strstr(start, "\x0D\x0A");
        start = strstr(start, "gzip");

        if (start && start < end) {
            w->response.zstream.zalloc = Z_NULL;
            w->response.zstream.zfree = Z_NULL;
            w->response.zstream.opaque = Z_NULL;
            if(deflateInit2(&w->response.zstream, web_gzip_level, Z_DEFLATED, 15 + 16, 8, web_gzip_strategy) == Z_OK) {
                w->response.zinitialized = 1;
                w->response.zoutput = 1;
            } else
                error("Failed to initialize zlib. Proceeding without compression.");
        }
    }

    if (w->response.data->len && w->response.zinitialized) {
        w->response.zstream.next_in = (Bytef *)w->response.data->buffer;
        w->response.zstream.avail_in = w->response.data->len;
        do {
            w->response.zstream.avail_out = NETDATA_WEB_RESPONSE_ZLIB_CHUNK_SIZE;
            w->response.zstream.next_out = w->response.zbuffer;
            z_ret = deflate(&w->response.zstream, Z_FINISH);
            if(z_ret < 0) {
                if(w->response.zstream.msg)
                    error("Error compressing body. ZLIB error: \"%s\"", w->response.zstream.msg);
                else
                    error("Unknown error during zlib compression.");
                retval = 1;
                goto cleanup;
            }
            int bytes_to_cpy = NETDATA_WEB_RESPONSE_ZLIB_CHUNK_SIZE - w->response.zstream.avail_out;
            buffer_need_bytes(z_buffer, bytes_to_cpy);
            memcpy(&z_buffer->buffer[z_buffer->len], w->response.zbuffer, bytes_to_cpy);
            z_buffer->len += bytes_to_cpy;
        } while(z_ret != Z_STREAM_END);
        // so that web_client_build_http_header
        // puts correct content lenght into header
        buffer_free(w->response.data);
        w->response.data = z_buffer;
        z_buffer = NULL;
    }
#endif

    now_realtime_timeval(&w->tv_ready);
    w->response.data->date = w->tv_ready.tv_sec;
    web_client_build_http_header(w);
    local_buffer = buffer_create(NETDATA_WEB_RESPONSE_INITIAL_SIZE);
    local_buffer->contenttype = CT_APPLICATION_JSON;

    buffer_strcat(local_buffer, w->response.header_output->buffer);

    if (w->response.data->len) {
#ifdef NETDATA_WITH_ZLIB
        if (w->response.zinitialized) {
            buffer_need_bytes(local_buffer, w->response.data->len);
            memcpy(&local_buffer->buffer[local_buffer->len], w->response.data->buffer, w->response.data->len);
            local_buffer->len += w->response.data->len;
        } else {
#endif
            buffer_strcat(local_buffer, w->response.data->buffer);
#ifdef NETDATA_WITH_ZLIB
        }
#endif
    }

    aclk_http_msg_v2(client, query->callback_topic, query->msg_id, t, query->created, w->response.code, local_buffer->buffer, local_buffer->len);

cleanup:
#ifdef NETDATA_WITH_ZLIB
    if(w->response.zinitialized)
        deflateEnd(&w->response.zstream);
    buffer_free(z_buffer);
#endif
    buffer_free(w->response.data);
    buffer_free(w->response.header);
    buffer_free(w->response.header_output);
    freez(w);
    buffer_free(local_buffer);
    return retval;
}

static int chart_query(mqtt_wss_client client, aclk_query_t query)
{
    aclk_chart_msg(client, query->data.chart_add_del.host, query->data.chart_add_del.chart_name);
    return 0;
}

static int alarm_state_update_query(mqtt_wss_client client, aclk_query_t query)
{
    aclk_alarm_state_msg(client, query->data.alarm_update);
    // aclk_alarm_state_msg frees the json object including the header it generates
    query->data.alarm_update = NULL;
    return 0;
}

aclk_query_handler aclk_query_handlers[] = {
    { .type = HTTP_API_V2,        .name = "http api request v2", .fnc = http_api_v2              },
    { .type = ALARM_STATE_UPDATE, .name = "alarm state update",  .fnc = alarm_state_update_query },
    { .type = METADATA_INFO,      .name = "info metadata",       .fnc = info_metadata            },
    { .type = METADATA_ALARMS,    .name = "alarms metadata",     .fnc = alarms_metadata          },
    { .type = CHART_NEW,          .name = "chart new",           .fnc = chart_query              },
    { .type = CHART_DEL,          .name = "chart delete",        .fnc = info_metadata            },
    { .type = UNKNOWN,            .name = NULL,                  .fnc = NULL                     }
};


static void aclk_query_process_msg(struct aclk_query_thread *info, aclk_query_t query)
{
    for (int i = 0; aclk_query_handlers[i].type != UNKNOWN; i++) {
        if (aclk_query_handlers[i].type == query->type) {
            debug(D_ACLK, "Processing Queued Message of type: \"%s\"", aclk_query_handlers[i].name);
            aclk_query_handlers[i].fnc(info->client, query);
            aclk_query_free(query);
            if (aclk_stats_enabled) {
                ACLK_STATS_LOCK;
                aclk_metrics_per_sample.queries_dispatched++;
                aclk_queries_per_thread[info->idx]++;
                ACLK_STATS_UNLOCK;
            }
            return;
        }
    }
    fatal("Unknown query in query queue. %u", query->type);
}

/* Processes messages from queue. Compete for work with other threads
 */
int aclk_query_process_msgs(struct aclk_query_thread *info)
{
    aclk_query_t query;
    while ((query = aclk_queue_pop()))
        aclk_query_process_msg(info, query);

    return 0;
}

/**
 * Main query processing thread
 */
void *aclk_query_main_thread(void *ptr)
{
    struct aclk_query_thread *info = ptr;
    while (!netdata_exit) {
        aclk_query_process_msgs(info);

        QUERY_THREAD_LOCK;

        if (unlikely(pthread_cond_wait(&query_cond_wait, &query_lock_wait)))
            sleep_usec(USEC_PER_SEC * 1);

        QUERY_THREAD_UNLOCK;
    }
    return NULL;
}

#define TASK_LEN_MAX 16
void aclk_query_threads_start(struct aclk_query_threads *query_threads, mqtt_wss_client client)
{
    info("Starting %d query threads.", query_threads->count);

    char thread_name[TASK_LEN_MAX];
    query_threads->thread_list = callocz(query_threads->count, sizeof(struct aclk_query_thread));
    for (int i = 0; i < query_threads->count; i++) {
        query_threads->thread_list[i].idx = i; //thread needs to know its index for statistics

        if(unlikely(snprintf(thread_name, TASK_LEN_MAX, "%s_%d", ACLK_QUERY_THREAD_NAME, i) < 0))
            error("snprintf encoding error");
        netdata_thread_create(
            &query_threads->thread_list[i].thread, thread_name, NETDATA_THREAD_OPTION_JOINABLE, aclk_query_main_thread,
            &query_threads->thread_list[i]);

        query_threads->thread_list[i].client = client;
    }
}

void aclk_query_threads_cleanup(struct aclk_query_threads *query_threads)
{
    if (query_threads && query_threads->thread_list) {
        for (int i = 0; i < query_threads->count; i++) {
            netdata_thread_join(query_threads->thread_list[i].thread, NULL);
        }
        freez(query_threads->thread_list);
    }
    aclk_queue_lock();
    aclk_queue_flush();
}