1061 lines
29 KiB
C
1061 lines
29 KiB
C
/*
|
|
* Copyright (c) 2016 MariaDB Corporation Ab
|
|
*
|
|
* Use of this software is governed by the Business Source License included
|
|
* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
|
|
*
|
|
* Change Date: 2020-01-01
|
|
*
|
|
* On the date above, in accordance with the Business Source License, use
|
|
* of this software will be governed by version 2 or later of the General
|
|
* Public License.
|
|
*/
|
|
|
|
/**
|
|
* @file avro_client.c - contains code for the AVRO router to client communication
|
|
*
|
|
* @verbatim
|
|
* Revision History
|
|
*
|
|
* Date Who Description
|
|
* 10/03/2016 Massimiliano Pinto Initial implementation
|
|
* 11/03/2016 Massimiliano Pinto Addition of JSON output
|
|
*
|
|
* @endverbatim
|
|
*/
|
|
|
|
#include "avrorouter.h"
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <maxscale/service.h>
|
|
#include <maxscale/server.h>
|
|
#include <maxscale/router.h>
|
|
#include <maxscale/atomic.h>
|
|
#include <maxscale/spinlock.h>
|
|
#include <maxscale/dcb.h>
|
|
#include <maxscale/spinlock.h>
|
|
#include <maxscale/log_manager.h>
|
|
#include <maxscale/version.h>
|
|
#include <maxavro.h>
|
|
#include <maxscale/alloc.h>
|
|
|
|
extern char *blr_extract_column(GWBUF *buf, int col);
|
|
extern uint32_t extract_field(uint8_t *src, int bits);
|
|
|
|
/* AVRO */
|
|
static int avro_client_do_registration(AVRO_INSTANCE *, AVRO_CLIENT *, GWBUF *);
|
|
int avro_client_callback(DCB *dcb, DCB_REASON reason, void *data);
|
|
static void avro_client_process_command(AVRO_INSTANCE *router, AVRO_CLIENT *client, GWBUF *queue);
|
|
static bool avro_client_stream_data(AVRO_CLIENT *client);
|
|
void avro_notify_client(AVRO_CLIENT *client);
|
|
void poll_fake_write_event(DCB *dcb);
|
|
GWBUF* read_avro_json_schema(const char *avrofile, const char* dir);
|
|
GWBUF* read_avro_binary_schema(const char *avrofile, const char* dir);
|
|
const char* get_avrofile_name(const char *file_ptr, int data_len, char *dest);
|
|
|
|
/**
|
|
* Process a request packet from the slave server.
|
|
*
|
|
* @param router The router instance this defines the master for this replication chain
|
|
* @param client The client specific data
|
|
* @param queue The incoming request packet
|
|
* @return 1 on success, 0 on error or failure
|
|
*/
|
|
int
|
|
avro_client_handle_request(AVRO_INSTANCE *router, AVRO_CLIENT *client, GWBUF *queue)
|
|
{
|
|
int rval = 1;
|
|
|
|
switch (client->state)
|
|
{
|
|
case AVRO_CLIENT_ERRORED:
|
|
/* force disconnection */
|
|
return 0;
|
|
break;
|
|
case AVRO_CLIENT_UNREGISTERED:
|
|
if (avro_client_do_registration(router, client, queue) == 0)
|
|
{
|
|
client->state = AVRO_CLIENT_ERRORED;
|
|
dcb_printf(client->dcb, "ERR, code 12, msg: Registration failed\n");
|
|
/* force disconnection */
|
|
dcb_close(client->dcb);
|
|
rval = 0;
|
|
}
|
|
else
|
|
{
|
|
/* Send OK ack to client */
|
|
dcb_printf(client->dcb, "OK\n");
|
|
|
|
client->state = AVRO_CLIENT_REGISTERED;
|
|
MXS_INFO("%s: Client [%s] has completed REGISTRATION action",
|
|
client->dcb->service->name,
|
|
client->dcb->remote != NULL ? client->dcb->remote : "");
|
|
}
|
|
break;
|
|
case AVRO_CLIENT_REGISTERED:
|
|
case AVRO_CLIENT_REQUEST_DATA:
|
|
if (client->state == AVRO_CLIENT_REGISTERED)
|
|
{
|
|
client->state = AVRO_CLIENT_REQUEST_DATA;
|
|
}
|
|
|
|
/* Process command from client */
|
|
avro_client_process_command(router, client, queue);
|
|
|
|
break;
|
|
default:
|
|
client->state = AVRO_CLIENT_ERRORED;
|
|
rval = 0;
|
|
break;
|
|
}
|
|
|
|
gwbuf_free(queue);
|
|
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* Handle the REGISTRATION command
|
|
*
|
|
* @param dcb DCB with allocateid protocol
|
|
* @param data GWBUF with registration message
|
|
* @return 1 for successful registration 0 otherwise
|
|
*
|
|
*/
|
|
static int
|
|
avro_client_do_registration(AVRO_INSTANCE *router, AVRO_CLIENT *client, GWBUF *data)
|
|
{
|
|
const char reg_uuid[] = "REGISTER UUID=";
|
|
const int reg_uuid_len = strlen(reg_uuid);
|
|
int data_len = GWBUF_LENGTH(data) - reg_uuid_len;
|
|
char *request = (char*)GWBUF_DATA(data);
|
|
int ret = 0;
|
|
|
|
if (strstr(request, reg_uuid) != NULL)
|
|
{
|
|
char *sep_ptr;
|
|
int uuid_len = (data_len > CDC_UUID_LEN) ? CDC_UUID_LEN : data_len;
|
|
/* 36 +1 */
|
|
char uuid[uuid_len + 1];
|
|
memcpy(uuid, request + reg_uuid_len, uuid_len);
|
|
uuid[uuid_len] = '\0';
|
|
|
|
if ((sep_ptr = strchr(uuid, ',')) != NULL)
|
|
{
|
|
*sep_ptr = '\0';
|
|
}
|
|
if ((sep_ptr = strchr(uuid + strlen(uuid), ' ')) != NULL)
|
|
{
|
|
*sep_ptr = '\0';
|
|
}
|
|
if ((sep_ptr = strchr(uuid, ' ')) != NULL)
|
|
{
|
|
*sep_ptr = '\0';
|
|
}
|
|
|
|
if (strlen(uuid) < uuid_len)
|
|
{
|
|
data_len -= (uuid_len - strlen(uuid));
|
|
}
|
|
|
|
uuid_len = strlen(uuid);
|
|
|
|
client->uuid = MXS_STRDUP_A(uuid);
|
|
|
|
if (data_len > 0)
|
|
{
|
|
/* Check for CDC request type */
|
|
char *tmp_ptr = strstr(request + sizeof(reg_uuid) + uuid_len, "TYPE=");
|
|
if (tmp_ptr)
|
|
{
|
|
if (memcmp(tmp_ptr + 5, "AVRO", 4) == 0)
|
|
{
|
|
ret = 1;
|
|
client->state = AVRO_CLIENT_REGISTERED;
|
|
client->format = AVRO_FORMAT_AVRO;
|
|
}
|
|
else if (memcmp(tmp_ptr + 5, "JSON", 4) == 0)
|
|
{
|
|
ret = 1;
|
|
client->state = AVRO_CLIENT_REGISTERED;
|
|
client->format = AVRO_FORMAT_JSON;
|
|
}
|
|
else
|
|
{
|
|
fprintf(stderr, "Registration TYPE not supported, only AVRO\n");
|
|
}
|
|
}
|
|
else
|
|
{
|
|
fprintf(stderr, "TYPE not found in Registration\n");
|
|
}
|
|
}
|
|
else
|
|
{
|
|
fprintf(stderr, "Registration data_len = 0\n");
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* Extract the GTID the client requested
|
|
* @param gtid
|
|
* @param start
|
|
* @param end
|
|
*/
|
|
void extract_gtid_request(gtid_pos_t *gtid, const char *start, int len)
|
|
{
|
|
const char *ptr = start;
|
|
int read = 0;
|
|
|
|
while (ptr < start + len)
|
|
{
|
|
if (!isdigit(*ptr))
|
|
{
|
|
ptr++;
|
|
}
|
|
else
|
|
{
|
|
char *end;
|
|
switch (read)
|
|
{
|
|
case 0:
|
|
gtid->domain = strtol(ptr, &end, 10);
|
|
break;
|
|
case 1:
|
|
gtid->server_id = strtol(ptr, &end, 10);
|
|
break;
|
|
case 2:
|
|
gtid->seq = strtol(ptr, &end, 10);
|
|
break;
|
|
}
|
|
read++;
|
|
ptr = end;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Callback for GTID retrieval
|
|
* @param data User data
|
|
* @param ncolumns Number of columns
|
|
* @param values Row data
|
|
* @param names Field names
|
|
* @return 0 on success
|
|
*/
|
|
int gtid_query_cb(void* data, int ncolumns, char** values, char** names)
|
|
{
|
|
json_t *arr = (json_t*)data;
|
|
|
|
if (values[0])
|
|
{
|
|
json_array_append_new(arr, json_string(values[0]));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Callback for GTID retrieval
|
|
* @param data User data
|
|
* @param ncolumns Number of columns
|
|
* @param values Row data
|
|
* @param names Field names
|
|
* @return 0 on success
|
|
*/
|
|
int gtid_query_cb_plain(void* data, int ncolumns, char** values, char** names)
|
|
{
|
|
DCB *dcb = (DCB *)data;
|
|
if (values[0])
|
|
{
|
|
dcb_printf(dcb, "%s ", values[0]);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Add the tables involved in the latest transaction to a JSON object
|
|
*
|
|
* @param handle SQLite3 handle
|
|
* @param obj JSON object to add values to
|
|
* @param gtid GTID of the last transaction
|
|
*/
|
|
void add_used_tables(sqlite3 *handle, json_t* obj, gtid_pos_t* gtid)
|
|
{
|
|
char sql[AVRO_SQL_BUFFER_SIZE];
|
|
snprintf(sql, sizeof(sql), "SELECT table_name FROM "USED_TABLES_TABLE_NAME
|
|
" WHERE domain = %lu AND server_id = %lu AND sequence = %lu",
|
|
gtid->domain, gtid->server_id, gtid->seq);
|
|
|
|
char* errmsg;
|
|
json_t *arr = json_array();
|
|
|
|
if (sqlite3_exec(handle, sql, gtid_query_cb, arr,
|
|
&errmsg) != SQLITE_OK)
|
|
{
|
|
json_decref(arr);
|
|
MXS_ERROR("Failed to execute query: %s", errmsg);
|
|
}
|
|
else
|
|
{
|
|
json_object_set_new(obj, "tables", arr);
|
|
}
|
|
sqlite3_free(errmsg);
|
|
}
|
|
|
|
/**
|
|
* Get the tables involved in the latest transaction.
|
|
*
|
|
* Sqlite3 callback routine calls dcb_printf()
|
|
*
|
|
* @param router The AVRO router instance
|
|
* @param dcb The dcb to write data
|
|
*/
|
|
void avro_get_used_tables(AVRO_INSTANCE *router, DCB* dcb)
|
|
{
|
|
sqlite3 *handle = router->sqlite_handle;
|
|
char sql[AVRO_SQL_BUFFER_SIZE];
|
|
snprintf(sql, sizeof(sql), "SELECT table_name FROM "USED_TABLES_TABLE_NAME
|
|
" WHERE domain = %lu AND server_id = %lu AND sequence = %lu",
|
|
router->gtid.domain, router->gtid.server_id, router->gtid.seq);
|
|
|
|
char* errmsg;
|
|
|
|
/* call dcb_printf via callback */
|
|
if (sqlite3_exec(handle, sql, gtid_query_cb_plain, dcb,
|
|
&errmsg) != SQLITE_OK)
|
|
{
|
|
MXS_ERROR("Failed to execute query: %s", errmsg);
|
|
}
|
|
sqlite3_free(errmsg);
|
|
}
|
|
|
|
/**
|
|
* Callback for timestamp retrieval
|
|
*
|
|
* @param data User data
|
|
* @param ncolumns Number of columns
|
|
* @param values Row data
|
|
* @param names Field names
|
|
* @return 0 on success
|
|
*/
|
|
int timestamp_query_cb(void* data, int ncolumns, char** values, char** names)
|
|
{
|
|
long *val = (long*)data;
|
|
|
|
if (values[0])
|
|
{
|
|
*val = strtol(values[0], NULL, 10);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Add the GTID timestamp to a JSON object
|
|
*
|
|
* @param handle
|
|
* @param obj
|
|
* @param gtid
|
|
*/
|
|
void add_timestamp(sqlite3 *handle, json_t* obj, gtid_pos_t* gtid)
|
|
{
|
|
char sql[AVRO_SQL_BUFFER_SIZE];
|
|
snprintf(sql, sizeof(sql), "SELECT DISTINCT binlog_timestamp FROM "USED_TABLES_TABLE_NAME
|
|
" WHERE domain = %lu AND server_id = %lu AND sequence = %lu",
|
|
gtid->domain, gtid->server_id, gtid->seq);
|
|
|
|
char* errmsg;
|
|
long ts = 0;
|
|
|
|
if (sqlite3_exec(handle, sql, timestamp_query_cb, &ts,
|
|
&errmsg) == SQLITE_OK)
|
|
{
|
|
json_object_set_new(obj, "timestamp", json_integer(ts));
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Failed to execute query: %s", errmsg);
|
|
}
|
|
sqlite3_free(errmsg);
|
|
|
|
}
|
|
|
|
/**
|
|
* Send information about the current GTID being processed
|
|
* @param router Router instance
|
|
* @param dcb Client DCB
|
|
*/
|
|
void send_gtid_info(AVRO_INSTANCE *router, gtid_pos_t *gtid_pos, DCB *dcb)
|
|
{
|
|
json_t *obj = json_object();
|
|
|
|
if (obj)
|
|
{
|
|
char gtid[256];
|
|
snprintf(gtid, sizeof(gtid), "%lu-%lu-%lu", gtid_pos->domain,
|
|
gtid_pos->server_id, gtid_pos->seq);
|
|
json_object_set_new(obj, "GTID", json_string(gtid));
|
|
|
|
// TODO: Store number of events in the database
|
|
json_object_set_new(obj, "events", json_integer(gtid_pos->event_num));
|
|
|
|
add_timestamp(router->sqlite_handle, obj, gtid_pos);
|
|
add_used_tables(router->sqlite_handle, obj, gtid_pos);
|
|
|
|
char *js = json_dumps(obj, 0);
|
|
size_t size = strlen(js);
|
|
GWBUF *buffer = gwbuf_alloc_and_load(size, js);
|
|
MXS_FREE(js);
|
|
dcb->func.write(dcb, buffer);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Check if a file exists in a directory
|
|
*
|
|
* @param dir Directory where the file is searched
|
|
* @param file File to search
|
|
* @return True if file exists
|
|
*/
|
|
bool file_in_dir(const char *dir, const char *file)
|
|
{
|
|
char path[PATH_MAX + 1];
|
|
|
|
snprintf(path, sizeof(path), "%s/%s", dir, file);
|
|
|
|
return access(path, F_OK) == 0;
|
|
}
|
|
|
|
/**
|
|
* Process command from client
|
|
*
|
|
* @param router The router instance
|
|
* @param client The specific client data
|
|
* @param data GWBUF with command
|
|
*
|
|
*/
|
|
static void
|
|
avro_client_process_command(AVRO_INSTANCE *router, AVRO_CLIENT *client, GWBUF *queue)
|
|
{
|
|
const char req_data[] = "REQUEST-DATA";
|
|
const char req_last_gtid[] = "QUERY-LAST-TRANSACTION";
|
|
const char req_gtid[] = "QUERY-TRANSACTION";
|
|
const size_t req_data_len = sizeof(req_data) - 1;
|
|
size_t buflen = gwbuf_length(queue);
|
|
uint8_t data[buflen + 1];
|
|
gwbuf_copy_data(queue, 0, buflen, data);
|
|
data[buflen] = '\0';
|
|
char *command_ptr = strstr((char *)data, req_data);
|
|
|
|
if (command_ptr != NULL)
|
|
{
|
|
char *file_ptr = command_ptr + req_data_len;
|
|
int data_len = GWBUF_LENGTH(queue) - req_data_len;
|
|
|
|
if (data_len > 1)
|
|
{
|
|
const char *gtid_ptr = get_avrofile_name(file_ptr, data_len, client->avro_binfile);
|
|
|
|
if (gtid_ptr)
|
|
{
|
|
client->requested_gtid = true;
|
|
extract_gtid_request(&client->gtid, gtid_ptr, data_len - (gtid_ptr - file_ptr));
|
|
memcpy(&client->gtid_start, &client->gtid, sizeof(client->gtid_start));
|
|
}
|
|
|
|
if (file_in_dir(router->avrodir, client->avro_binfile))
|
|
{
|
|
/* set callback routine for data sending */
|
|
dcb_add_callback(client->dcb, DCB_REASON_DRAINED, avro_client_callback, client);
|
|
|
|
/* Add fake event that will call the avro_client_callback() routine */
|
|
poll_fake_write_event(client->dcb);
|
|
}
|
|
else
|
|
{
|
|
dcb_printf(client->dcb, "ERR NO-FILE File '%s' not found.", client->avro_binfile);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
dcb_printf(client->dcb, "ERR REQUEST-DATA with no data");
|
|
}
|
|
}
|
|
/* Return last GTID info */
|
|
else if (strstr((char *)data, req_last_gtid))
|
|
{
|
|
send_gtid_info(router, &router->gtid, client->dcb);
|
|
}
|
|
/** Return requested GTID */
|
|
else if (strstr((char *)data, req_gtid))
|
|
{
|
|
gtid_pos_t gtid = {0, 0, 0, 0, 0};
|
|
extract_gtid_request(>id, (char*)data + sizeof(req_gtid),
|
|
GWBUF_LENGTH(queue) - sizeof(req_gtid));
|
|
send_gtid_info(router, >id, client->dcb);
|
|
}
|
|
else
|
|
{
|
|
GWBUF *reply = gwbuf_alloc(5);
|
|
memcpy(GWBUF_DATA(reply), "ECHO:", 5);
|
|
reply = gwbuf_append(reply, gwbuf_clone(queue));
|
|
client->dcb->func.write(client->dcb, reply);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Form the full Avro file name
|
|
*
|
|
* @param file_ptr Requested file
|
|
* @param data_len Length of string pointed by @p file_ptr
|
|
* @param dest Destination where the file name is stored. Must be at least
|
|
* @p data_len + 1 bytes.
|
|
*/
|
|
const char* get_avrofile_name(const char *file_ptr, int data_len, char *dest)
|
|
{
|
|
while (isspace(*file_ptr))
|
|
{
|
|
file_ptr++;
|
|
data_len--;
|
|
}
|
|
|
|
char avro_file[data_len + 1];
|
|
memcpy(avro_file, file_ptr, data_len);
|
|
avro_file[data_len] = '\0';
|
|
|
|
char *cmd_sep = strchr(avro_file, ' ');
|
|
const char *rval = NULL;
|
|
|
|
if (cmd_sep)
|
|
{
|
|
*cmd_sep++ = '\0';
|
|
rval = file_ptr + (cmd_sep - avro_file);
|
|
ss_dassert(rval < file_ptr + data_len);
|
|
}
|
|
|
|
/** Exact file version specified */
|
|
if ((cmd_sep = strchr(avro_file, '.')) && (cmd_sep = strchr(cmd_sep + 1, '.')) &&
|
|
strlen(cmd_sep + 1) > 0)
|
|
{
|
|
snprintf(dest, AVRO_MAX_FILENAME_LEN, "%s.avro", avro_file);
|
|
}
|
|
/** No version specified, send all files */
|
|
else
|
|
{
|
|
snprintf(dest, AVRO_MAX_FILENAME_LEN, "%s.000001.avro", avro_file);
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
static int send_row(DCB *dcb, json_t* row)
|
|
{
|
|
char *json = json_dumps(row, JSON_PRESERVE_ORDER);
|
|
size_t len = strlen(json);
|
|
GWBUF *buf = gwbuf_alloc(len + 1);
|
|
int rc = 0;
|
|
|
|
if (json && buf)
|
|
{
|
|
uint8_t *data = GWBUF_DATA(buf);
|
|
memcpy(data, json, len);
|
|
data[len] = '\n';
|
|
rc = dcb->func.write(dcb, buf);
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Failed to dump JSON value.");
|
|
rc = 0;
|
|
}
|
|
MXS_FREE(json);
|
|
return rc;
|
|
}
|
|
|
|
static void set_current_gtid(AVRO_CLIENT *client, json_t *row)
|
|
{
|
|
json_t *obj = json_object_get(row, avro_sequence);
|
|
ss_dassert(json_is_integer(obj));
|
|
client->gtid.seq = json_integer_value(obj);
|
|
|
|
obj = json_object_get(row, avro_server_id);
|
|
ss_dassert(json_is_integer(obj));
|
|
client->gtid.server_id = json_integer_value(obj);
|
|
|
|
obj = json_object_get(row, avro_domain);
|
|
ss_dassert(json_is_integer(obj));
|
|
client->gtid.domain = json_integer_value(obj);
|
|
}
|
|
|
|
/**
|
|
* @brief Stream Avro data in JSON format
|
|
*
|
|
* @param file File to stream from
|
|
* @param dcb DCB to stream to
|
|
* @return True if more data is readable, false if all data was sent
|
|
*/
|
|
static bool stream_json(AVRO_CLIENT *client)
|
|
{
|
|
int bytes = 0;
|
|
MAXAVRO_FILE *file = client->file_handle;
|
|
DCB *dcb = client->dcb;
|
|
|
|
do
|
|
{
|
|
json_t *row;
|
|
int rc = 1;
|
|
while (rc > 0 && (row = maxavro_record_read_json(file)))
|
|
{
|
|
rc = send_row(dcb, row);
|
|
set_current_gtid(client, row);
|
|
json_decref(row);
|
|
}
|
|
bytes += file->buffer_size;
|
|
}
|
|
while (maxavro_next_block(file) && bytes < AVRO_DATA_BURST_SIZE);
|
|
|
|
return bytes >= AVRO_DATA_BURST_SIZE;
|
|
}
|
|
|
|
/**
|
|
* @brief Stream Avro data in native Avro format
|
|
*
|
|
* @param file File to stream from
|
|
* @param dcb DCB to stream to
|
|
* @return True if streaming was successful, false if an error occurred
|
|
*/
|
|
static bool stream_binary(AVRO_CLIENT *client)
|
|
{
|
|
GWBUF *buffer;
|
|
uint64_t bytes = 0;
|
|
int rc = 1;
|
|
MAXAVRO_FILE *file = client->file_handle;
|
|
DCB *dcb = client->dcb;
|
|
|
|
while (rc > 0 && bytes < AVRO_DATA_BURST_SIZE)
|
|
{
|
|
bytes += file->buffer_size;
|
|
if ((buffer = maxavro_record_read_binary(file)))
|
|
{
|
|
rc = dcb->func.write(dcb, buffer);
|
|
}
|
|
else
|
|
{
|
|
rc = 0;
|
|
}
|
|
}
|
|
|
|
return bytes >= AVRO_DATA_BURST_SIZE;
|
|
}
|
|
|
|
static int sqlite_cb(void* data, int rows, char** values, char** names)
|
|
{
|
|
for (int i = 0; i < rows; i++)
|
|
{
|
|
if (values[i])
|
|
{
|
|
*((long*)data) = strtol(values[i], NULL, 10);
|
|
return 0;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const char select_template[] = "SELECT max(position) FROM gtid WHERE domain=%lu "
|
|
"AND server_id=%lu AND sequence <= %lu AND avrofile=\"%s\";";
|
|
|
|
static bool seek_to_index_pos(AVRO_CLIENT *client, MAXAVRO_FILE* file)
|
|
{
|
|
char *name = strrchr(client->file_handle->filename, '/');
|
|
ss_dassert(name);
|
|
name++;
|
|
|
|
char sql[sizeof(select_template) + NAME_MAX + 80];
|
|
snprintf(sql, sizeof(sql), select_template, client->gtid.domain,
|
|
client->gtid.server_id, client->gtid.seq, name);
|
|
|
|
long offset = -1;
|
|
char *errmsg = NULL;
|
|
bool rval = false;
|
|
|
|
if (sqlite3_exec(client->sqlite_handle, sql, sqlite_cb, &offset, &errmsg) == SQLITE_OK)
|
|
{
|
|
rval = true;
|
|
if (offset > 0 && !maxavro_record_set_pos(file, offset))
|
|
{
|
|
rval = false;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Failed to query index position for GTID %lu-%lu-%lu: %s",
|
|
client->gtid.domain, client->gtid.server_id, client->gtid.seq, errmsg);
|
|
}
|
|
sqlite3_free(errmsg);
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
*
|
|
* @param client
|
|
* @param file
|
|
*/
|
|
static bool seek_to_gtid(AVRO_CLIENT *client, MAXAVRO_FILE* file)
|
|
{
|
|
bool seeking = true;
|
|
|
|
do
|
|
{
|
|
json_t *row;
|
|
while ((row = maxavro_record_read_json(file)))
|
|
{
|
|
json_t *obj = json_object_get(row, avro_sequence);
|
|
ss_dassert(json_is_integer(obj));
|
|
uint64_t value = json_integer_value(obj);
|
|
|
|
/** If a larger GTID is found, use that */
|
|
if (value >= client->gtid.seq)
|
|
{
|
|
obj = json_object_get(row, avro_server_id);
|
|
ss_dassert(json_is_integer(obj));
|
|
value = json_integer_value(obj);
|
|
|
|
if (value == client->gtid.server_id)
|
|
{
|
|
obj = json_object_get(row, avro_domain);
|
|
ss_dassert(json_is_integer(obj));
|
|
value = json_integer_value(obj);
|
|
|
|
if (value == client->gtid.domain)
|
|
{
|
|
MXS_INFO("Found GTID %lu-%lu-%lu for %s@%s",
|
|
client->gtid.domain, client->gtid.server_id,
|
|
client->gtid.seq, client->dcb->user, client->dcb->remote);
|
|
seeking = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
/** We'll send the first found row immediately since we have already
|
|
* read the row into memory */
|
|
if (!seeking)
|
|
{
|
|
send_row(client->dcb, row);
|
|
}
|
|
|
|
json_decref(row);
|
|
}
|
|
}
|
|
while (seeking && maxavro_next_block(file));
|
|
|
|
return !seeking;
|
|
}
|
|
|
|
/**
|
|
* Print JSON output from selected AVRO file
|
|
*
|
|
* @param router The router instance
|
|
* @param client The specific client data
|
|
* @param avro_file The requested AVRO file
|
|
* @return True if more data needs to be read
|
|
*/
|
|
static bool avro_client_stream_data(AVRO_CLIENT *client)
|
|
{
|
|
bool read_more = false;
|
|
AVRO_INSTANCE *router = client->router;
|
|
|
|
if (strnlen(client->avro_binfile, 1))
|
|
{
|
|
char filename[PATH_MAX + 1];
|
|
snprintf(filename, PATH_MAX, "%s/%s", router->avrodir, client->avro_binfile);
|
|
|
|
bool ok = true;
|
|
|
|
spinlock_acquire(&client->file_lock);
|
|
if (client->file_handle == NULL &&
|
|
(client->file_handle = maxavro_file_open(filename)) == NULL)
|
|
{
|
|
ok = false;
|
|
}
|
|
spinlock_release(&client->file_lock);
|
|
|
|
if (ok)
|
|
{
|
|
switch (client->format)
|
|
{
|
|
case AVRO_FORMAT_JSON:
|
|
/** Currently only JSON format supports seeking to a GTID */
|
|
if (client->requested_gtid &&
|
|
seek_to_index_pos(client, client->file_handle) &&
|
|
seek_to_gtid(client, client->file_handle))
|
|
{
|
|
client->requested_gtid = false;
|
|
}
|
|
|
|
read_more = stream_json(client);
|
|
break;
|
|
|
|
case AVRO_FORMAT_AVRO:
|
|
read_more = stream_binary(client);
|
|
break;
|
|
|
|
default:
|
|
MXS_ERROR("Unexpected format: %d", client->format);
|
|
break;
|
|
}
|
|
|
|
|
|
if (maxavro_get_error(client->file_handle) != MAXAVRO_ERR_NONE)
|
|
{
|
|
MXS_ERROR("Reading Avro file failed with error '%s'.",
|
|
maxavro_get_error_string(client->file_handle));
|
|
}
|
|
|
|
/* update client struct */
|
|
memcpy(&client->avro_file, client->file_handle, sizeof(client->avro_file));
|
|
|
|
/* may be just use client->avro_file->records_read and remove this var */
|
|
client->last_sent_pos = client->avro_file.records_read;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
fprintf(stderr, "No file specified\n");
|
|
dcb_printf(client->dcb, "ERR avro file not specified");
|
|
}
|
|
|
|
return read_more;
|
|
}
|
|
|
|
GWBUF* read_avro_json_schema(const char *avrofile, const char* dir)
|
|
{
|
|
GWBUF* rval = NULL;
|
|
const char *suffix = strrchr(avrofile, '.');
|
|
|
|
if (suffix)
|
|
{
|
|
char buffer[PATH_MAX + 1];
|
|
snprintf(buffer, sizeof(buffer), "%s/%.*s.avsc", dir, (int)(suffix - avrofile),
|
|
avrofile);
|
|
FILE *file = fopen(buffer, "rb");
|
|
|
|
if (file)
|
|
{
|
|
int nread;
|
|
while ((nread = fread(buffer, 1, sizeof(buffer) - 1, file)) > 0)
|
|
{
|
|
while (isspace(buffer[nread - 1]))
|
|
{
|
|
nread--;
|
|
}
|
|
|
|
buffer[nread++] = '\n';
|
|
|
|
GWBUF * newbuf = gwbuf_alloc_and_load(nread, buffer);
|
|
|
|
if (newbuf)
|
|
{
|
|
rval = gwbuf_append(rval, newbuf);
|
|
}
|
|
}
|
|
|
|
fclose(file);
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Failed to open file '%s': %d, %s", buffer, errno,
|
|
mxs_strerror(errno));
|
|
}
|
|
}
|
|
return rval;
|
|
}
|
|
|
|
GWBUF* read_avro_binary_schema(const char *avrofile, const char* dir)
|
|
{
|
|
GWBUF* rval = NULL;
|
|
char buffer[PATH_MAX + 1];
|
|
snprintf(buffer, sizeof(buffer), "%s/%s", dir, avrofile);
|
|
MAXAVRO_FILE *file = maxavro_file_open(buffer);
|
|
|
|
if (file)
|
|
{
|
|
rval = maxavro_file_binary_header(file);
|
|
maxavro_file_close(file);
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Failed to open file '%s'.", buffer);
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* Rotate to a new Avro file
|
|
* @param client Avro client session
|
|
* @param fullname Absolute path to the file to rotate to
|
|
*/
|
|
static void rotate_avro_file(AVRO_CLIENT *client, char *fullname)
|
|
{
|
|
char *filename = strrchr(fullname, '/') + 1;
|
|
size_t len = strlen(filename);
|
|
if (len > AVRO_MAX_FILENAME_LEN)
|
|
{
|
|
// TODO: This function is in need of a return value. It would
|
|
// TODO: be better to abort if the name is too long and also
|
|
// TODO: if the opening of the file fails.
|
|
MXS_ERROR("Filename %s of length %lu is longer than maximum allowed "
|
|
"length %d. Trailing data will be cut.",
|
|
filename, len, AVRO_MAX_FILENAME_LEN);
|
|
len = AVRO_MAX_FILENAME_LEN;
|
|
}
|
|
strncpy(client->avro_binfile, filename, len);
|
|
client->avro_binfile[len] = 0;
|
|
client->last_sent_pos = 0;
|
|
|
|
spinlock_acquire(&client->file_lock);
|
|
maxavro_file_close(client->file_handle);
|
|
|
|
if ((client->file_handle = maxavro_file_open(fullname)) == NULL)
|
|
{
|
|
MXS_ERROR("Failed to open file: %s", filename);
|
|
}
|
|
else
|
|
{
|
|
MXS_INFO("Rotated '%s'@'%s' to file: %s", client->dcb->user,
|
|
client->dcb->remote, fullname);
|
|
}
|
|
|
|
spinlock_release(&client->file_lock);
|
|
}
|
|
|
|
/**
|
|
* Print the name of the next Avro file
|
|
* @param file Current filename
|
|
* @param dir Directory where the files exist
|
|
* @param dest Destination where the full path to the file is printed
|
|
* @param len Size of @p dest
|
|
*/
|
|
static void print_next_filename(const char *file, const char *dir, char *dest, size_t len)
|
|
{
|
|
char buffer[strlen(file) + 1];
|
|
strcpy(buffer, file);
|
|
char *ptr = strrchr(buffer, '.');
|
|
|
|
if (ptr)
|
|
{
|
|
ptr--;
|
|
while (ptr > buffer && *(ptr) != '.')
|
|
{
|
|
ptr--;
|
|
}
|
|
|
|
int filenum = strtol(ptr + 1, NULL, 10);
|
|
*ptr = '\0';
|
|
snprintf(dest, len, "%s/%s.%06d.avro",
|
|
dir, buffer, filenum + 1);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief The client callback for sending data
|
|
*
|
|
* @param dcb Client DCB
|
|
* @param reason Why the callback was called
|
|
* @param userdata Data provided when the callback was added
|
|
* @return Always 0
|
|
*/
|
|
int avro_client_callback(DCB *dcb, DCB_REASON reason, void *userdata)
|
|
{
|
|
if (reason == DCB_REASON_DRAINED)
|
|
{
|
|
AVRO_CLIENT *client = (AVRO_CLIENT*)userdata;
|
|
|
|
spinlock_acquire(&client->catch_lock);
|
|
if (client->cstate & AVRO_CS_BUSY)
|
|
{
|
|
spinlock_release(&client->catch_lock);
|
|
return 0;
|
|
}
|
|
|
|
client->cstate |= AVRO_CS_BUSY;
|
|
spinlock_release(&client->catch_lock);
|
|
|
|
if (client->last_sent_pos == 0)
|
|
{
|
|
/** Send the schema of the current file */
|
|
GWBUF *schema = NULL;
|
|
|
|
switch (client->format)
|
|
{
|
|
case AVRO_FORMAT_JSON:
|
|
schema = read_avro_json_schema(client->avro_binfile, client->router->avrodir);
|
|
break;
|
|
|
|
case AVRO_FORMAT_AVRO:
|
|
schema = read_avro_binary_schema(client->avro_binfile, client->router->avrodir);
|
|
break;
|
|
|
|
default:
|
|
MXS_ERROR("Unknown client format: %d", client->format);
|
|
}
|
|
|
|
if (schema)
|
|
{
|
|
client->dcb->func.write(client->dcb, schema);
|
|
}
|
|
}
|
|
|
|
/** Stream the data to the client */
|
|
bool read_more = avro_client_stream_data(client);
|
|
|
|
char filename[PATH_MAX + 1];
|
|
print_next_filename(client->avro_binfile, client->router->avrodir,
|
|
filename, sizeof(filename));
|
|
|
|
bool next_file;
|
|
/** If the next file is available, send it to the client */
|
|
if ((next_file = (access(filename, R_OK) == 0)))
|
|
{
|
|
rotate_avro_file(client, filename);
|
|
}
|
|
|
|
spinlock_acquire(&client->catch_lock);
|
|
client->cstate &= ~AVRO_CS_BUSY;
|
|
client->cstate |= AVRO_WAIT_DATA;
|
|
|
|
if (next_file || read_more)
|
|
{
|
|
#ifdef SS_DEBUG
|
|
if (read_more)
|
|
{
|
|
MXS_DEBUG("Burst limit hit, need to read more data.");
|
|
}
|
|
#endif
|
|
avro_notify_client(client);
|
|
}
|
|
spinlock_release(&client->catch_lock);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* @brief Notify a client that new data is available
|
|
*
|
|
* The client catch_lock must be held when calling this function.
|
|
*
|
|
* @param client Client to notify
|
|
*/
|
|
void avro_notify_client(AVRO_CLIENT *client)
|
|
{
|
|
/* Add fake event that will call the avro_client_callback() routine */
|
|
poll_fake_write_event(client->dcb);
|
|
client->cstate &= ~AVRO_WAIT_DATA;
|
|
}
|