diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/Makefile | 45 | ||||
| -rw-r--r-- | src/TODO.org | 6 | ||||
| -rw-r--r-- | src/io.c | 59 | ||||
| -rw-r--r-- | src/io.h | 13 | ||||
| -rw-r--r-- | src/log.c | 60 | ||||
| -rw-r--r-- | src/log.h | 12 | ||||
| -rw-r--r-- | src/msg.c | 74 | ||||
| -rw-r--r-- | src/msg.h | 17 | ||||
| -rw-r--r-- | src/mysqlerl.app | 12 | ||||
| -rw-r--r-- | src/mysqlerl.c | 704 | ||||
| -rw-r--r-- | src/mysqlerl.erl | 251 | ||||
| -rw-r--r-- | src/mysqlerl.hrl | 9 | ||||
| -rw-r--r-- | src/mysqlerl_app.erl | 14 | ||||
| -rw-r--r-- | src/mysqlerl_connection.erl | 64 | ||||
| -rw-r--r-- | src/mysqlerl_connection_sup.erl | 31 | ||||
| -rw-r--r-- | src/mysqlerl_port.erl | 83 | ||||
| -rw-r--r-- | src/mysqlerl_port.hrl | 1 | ||||
| -rw-r--r-- | src/mysqlerl_port_sup.erl | 18 | ||||
| -rw-r--r-- | src/mysqlerl_sup.erl | 16 |
19 files changed, 1489 insertions, 0 deletions
diff --git a/src/Makefile b/src/Makefile new file mode 100644 index 0000000..4782487 --- /dev/null +++ b/src/Makefile @@ -0,0 +1,45 @@ +ERLPREFIX = /usr/local +ERLINTERFACE = erl_interface-3.7.6 +ERLINCS = -I$(ERLPREFIX)/lib/erlang/lib/$(ERLINTERFACE)/include +ERLLIBS = -L$(ERLPREFIX)/lib/erlang/lib/$(ERLINTERFACE)/lib \ + -lerl_interface -lei + +MYSQLPREFIX = /usr/local/mysql +MYSQLINCS = -I$(MYSQLPREFIX)/include +#MYSQLLIBS = -L$(MYSQLPREFIX)/lib -lmysqlclient +MYSQLLIBS = $(MYSQLPREFIX)/lib/libmysqlclient.a + +CFLAGS = -g -Wall -Werror $(MYSQLINCS) $(ERLINCS) +LDFLAGS = $(MYSQLLIBS) $(ERLLIBS) +EFLAGS = -W +debug_info + +PRIVDIR = ../priv +BEAMDIR = ../ebin + +BINS = $(PRIVDIR)/mysqlerl $(BEAMDIR)/mysqlerl.app +MYSQLERLOBJS = io.o log.o msg.o mysqlerl.o +BEAMS = mysqlerl.beam mysqlerl_app.beam mysqlerl_connection.beam \ + mysqlerl_connection_sup.beam mysqlerl_port.beam \ + mysqlerl_port_sup.beam mysqlerl_sup.beam + +all: $(PRIVDIR) $(BEAMDIR) $(BINS) + +clean: + rm -rf *.o *.beam + rm -rf $(BINS) $(MYSQLERLOBJS) $(BEAMS) $(BEAMDIR)/mysqlerl.app + +%.beam: %.erl + erlc $(EFLAGS) $< + +$(PRIVDIR)/mysqlerl: $(PRIVDIR) $(MYSQLERLOBJS) + $(CC) -o $@ $(MYSQLERLOBJS) $(LDFLAGS) + +$(BEAMDIR)/mysqlerl.app: $(BEAMDIR) $(BEAMS) + cp $(BEAMS) $(BEAMDIR) + cp mysqlerl.app $(BEAMDIR) + +$(PRIVDIR): + mkdir -p $(PRIVDIR) + +$(BEAMDIR): + mkdir -p $(BEAMDIR) diff --git a/src/TODO.org b/src/TODO.org new file mode 100644 index 0000000..636f47d --- /dev/null +++ b/src/TODO.org @@ -0,0 +1,6 @@ +* Support ODBC options where applicable. +* Test functions die (or don't) correctly when not connected to DB. +* Connection pooling with multiple databases. +I'm guessing that it doesn't work right now. Looks like +mysqlerl_connection_sup:connect starts a simple-one-for-one port, and +commands use :random_child to do dispatch. That's bad. diff --git a/src/io.c b/src/io.c new file mode 100644 index 0000000..dcc055f --- /dev/null +++ b/src/io.c @@ -0,0 +1,59 @@ +/* + * Copyright (C) 2008, Brian Cully <bjc@kublai.com> + */ + +#include "io.h" +#include "log.h" + +#include <errno.h> +#include <sys/types.h> +#include <sys/uio.h> +#include <unistd.h> + +int +restartable_read(unsigned char *buf, size_t buflen) +{ + ssize_t rc, readb; + + rc = 0; + READLOOP: + while (rc < buflen) { + readb = read(STDIN_FILENO, buf + rc, buflen - rc); + if (readb == -1) { + if (errno == EAGAIN || errno == EINTR) + goto READLOOP; + + return -1; + } else if (readb == 0) { + logmsg("ERROR: EOF trying to read additional %d bytes from " + "standard input", buflen - rc); + return -1; + } + + rc += readb; + } + + return rc; +} + +int +restartable_write(const unsigned char *buf, size_t buflen) +{ + ssize_t rc, wroteb; + + rc = 0; + WRITELOOP: + while (rc < buflen) { + wroteb = write(STDOUT_FILENO, buf + rc, buflen - rc); + if (wroteb == -1) { + if (errno == EAGAIN || errno == EINTR) + goto WRITELOOP; + + return -1; + } + + rc += wroteb; + } + + return rc; +} diff --git a/src/io.h b/src/io.h new file mode 100644 index 0000000..bf4e086 --- /dev/null +++ b/src/io.h @@ -0,0 +1,13 @@ +/* + * Copyright (C) 2008, Brian Cully <bjc@kublai.com> + */ + +#ifndef _IO_H +#define _IO_H + +#include <sys/types.h> + +int restartable_read(unsigned char *buf, size_t buflen); +int restartable_write(const unsigned char *buf, size_t buflen); + +#endif diff --git a/src/log.c b/src/log.c new file mode 100644 index 0000000..80aa755 --- /dev/null +++ b/src/log.c @@ -0,0 +1,60 @@ +/* + * Copyright (C) 2008, Brian Cully <bjc@kublai.com> + */ + +#include "log.h" + +#include <stdio.h> +#include <stdarg.h> +#include <time.h> +#include <unistd.h> + +const char *LOGPATH = "/tmp/mysqlerl.log"; +static FILE *logfile = NULL; + +void +openlog() +{ + logfile = fopen(LOGPATH, "a"); +} + +void +closelog() +{ + fclose(logfile); +} + +void +logmsg(const char *format, ...) +{ + FILE *out = logfile; + char timebuf[32] = "\0"; + struct tm now_tm; + time_t now_time; + va_list args; + + va_start(args, format); + + if (logfile == NULL) + out = stderr; + + if (time(&now_time) == (time_t)-1) { + (void)fprintf(out, "LOGERROR - Failed to fetch time: "); + } else { + (void)localtime_r(&now_time, &now_tm); + if (strftime(timebuf, sizeof(timebuf), "%Y%m%d %H:%M:%S ", &now_tm) == 0) { + (void)fprintf(out, "LOGERROR - Failed to parse time (now: %d): ", + (int)now_time); + } else { + (void)fprintf(out, "%s", timebuf); + } + } + (void)fprintf(out, "[%d]: ", getpid()); + (void)vfprintf(out, format, args); + (void)fprintf(out, "\n"); + + fflush(out); + + va_end(args); +} + diff --git a/src/log.h b/src/log.h new file mode 100644 index 0000000..ae9a9bd --- /dev/null +++ b/src/log.h @@ -0,0 +1,12 @@ +/* + * Copyright (C) 2008, Brian Cully <bjc@kublai.com> + */ + +#ifndef _LOG_H +#define _LOG_H + +void openlog(); +void closelog(); +void logmsg(const char *format, ...); + +#endif diff --git a/src/msg.c b/src/msg.c new file mode 100644 index 0000000..00a5a6a --- /dev/null +++ b/src/msg.c @@ -0,0 +1,74 @@ +/* + * Copyright (C) 2008, Brian Cully <bjc@kublai.com> + */ + +#include "msg.h" + +#include "io.h" +#include "log.h" + +#include <string.h> + +ETERM * +read_msg() +{ + ETERM *msg; + unsigned char *buf; + msglen_t len; + + logmsg("DEBUG: reading message length."); + if (restartable_read((unsigned char *)&len, sizeof(len)) == -1) { + logmsg("ERROR: couldn't read %d byte message prefix: %s.", + sizeof(len), strerror(errno)); + + exit(2); + } + + len = ntohl(len); + buf = (unsigned char *)malloc(len); + if (buf == NULL) { + logmsg("ERROR: Couldn't malloc %d bytes: %s.", len, + strerror(errno)); + + exit(2); + } + + logmsg("DEBUG: reading message body (len: %d).", len); + if (restartable_read(buf, len) == -1) { + logmsg("ERROR: couldn't read %d byte message: %s.", + len, strerror(errno)); + + free(buf); + exit(2); + } + + msg = erl_decode(buf); + free(buf); + + return msg; +} + +int +write_msg(ETERM *msg) +{ + unsigned char *buf; + msglen_t nlen, buflen; + + buflen = erl_term_len(msg); + buf = (unsigned char *)malloc(buflen); + erl_encode(msg, buf); + erl_free_term(msg); + + nlen = htonl(buflen); + if (restartable_write((unsigned char *)&nlen, sizeof(nlen)) == -1) { + free(buf); + return -1; + } + if (restartable_write(buf, buflen) == -1) { + free(buf); + return -1; + } + free(buf); + + return 0; +} diff --git a/src/msg.h b/src/msg.h new file mode 100644 index 0000000..6db2aa8 --- /dev/null +++ b/src/msg.h @@ -0,0 +1,17 @@ +/* + * Copyright (C) 2008, Brian Cully <bjc@kublai.com> + */ + +#ifndef _MSG_H +#define _MSG_H + +#include <erl_interface.h> +#include <ei.h> +#include <stdlib.h> + +typedef u_int32_t msglen_t; + +ETERM *read_msg(); +int write_msg(ETERM *msg); + +#endif diff --git a/src/mysqlerl.app b/src/mysqlerl.app new file mode 100644 index 0000000..5687463 --- /dev/null +++ b/src/mysqlerl.app @@ -0,0 +1,12 @@ +%% -*- Erlang -*- +%% Copyright (C) 2008, Brian Cully + +{application, mysqlerl, + [{description, "mysqlerl"}, + {vsn, "0"}, + {modules, [mysqlerl, mysqlerl_app, mysqlerl_connection_sup, + mysqlerl_connection, mysql_port_sup, mysql_port]}, + {registered, [mysqlerl, mysqlerl_app, mysqlerl_connection_sup]}, + {applications, [kernel, stdlib]}, + {env, []}, + {mod, {mysqlerl_app, []}}]}. diff --git a/src/mysqlerl.c b/src/mysqlerl.c new file mode 100644 index 0000000..020d9eb --- /dev/null +++ b/src/mysqlerl.c @@ -0,0 +1,704 @@ +/* + * MySQL port driver. + * + * Copyright (C) 2008, Brian Cully <bjc@kublai.com> + */ + +#include "io.h" +#include "log.h" +#include "msg.h" + +#include <errno.h> +#include <mysql.h> +#include <string.h> + +const int TRUTHY = 1; +const int FALSY = 0; + +const char *CONNECT_MSG = "sql_connect"; +const char *QUERY_MSG = "sql_query"; +const char *PARAM_QUERY_MSG = "sql_param_query"; +const char *SELECT_COUNT_MSG = "sql_select_count"; +const char *SELECT_MSG = "sql_select"; +const char *FIRST_MSG = "sql_first"; +const char *LAST_MSG = "sql_last"; +const char *NEXT_MSG = "sql_next"; +const char *PREV_MSG = "sql_prev"; + +const char *NULL_SQL = "null"; +const char *NUMERIC_SQL = "sql_numeric"; +const char *DECIMAL_SQL = "sql_decimal"; +const char *FLOAT_SQL = "sql_float"; +const char *CHAR_SQL = "sql_char"; +const char *VARCHAR_SQL = "sql_varchar"; +const char *TIMESTAMP_SQL = "sql_timestamp"; +const char *INTEGER_SQL = "sql_integer"; + +MYSQL dbh; +MYSQL_RES *results = NULL; +my_ulonglong resultoffset = 0, numrows = 0; + +void +set_mysql_results() +{ + if (results) + mysql_free_result(results); + results = mysql_store_result(&dbh); + + resultoffset = 0; + numrows = results ? mysql_num_rows(results) : 0; +} + +ETERM * +make_cols(MYSQL_FIELD *fields, unsigned int num_fields) +{ + ETERM **cols, *rc; + unsigned int i; + + cols = (ETERM **)malloc(num_fields * sizeof(ETERM *)); + if (cols == NULL) { + logmsg("ERROR: Couldn't allocate %d bytes for columns: %s", + strerror(errno)); + exit(3); + } + + for (i = 0; i < num_fields; i++) + cols[i] = erl_mk_string(fields[i].name); + + rc = erl_mk_list(cols, num_fields); + + for (i = 0; i < num_fields; i++) + erl_free_term(cols[i]); + free(cols); + + return rc; +} + +ETERM * +make_row(MYSQL_ROW row, unsigned long *lengths, unsigned int num_fields) +{ + ETERM **rowtup, *rc; + unsigned int i; + + rowtup = (ETERM **)malloc(num_fields * sizeof(ETERM *)); + if (rowtup == NULL) { + logmsg("ERROR: Couldn't allocate %d bytes for row: %s", + strerror(errno)); + exit(3); + } + + for (i = 0; i < num_fields; i++) { + if (row[i]) + rowtup[i] = erl_mk_estring(row[i], lengths[i]); + else + rowtup[i] = erl_mk_atom("null"); + } + + rc = erl_mk_tuple(rowtup, num_fields); + if (rc == NULL) { + logmsg("ERROR: couldn't allocate %d-tuple", num_fields); + exit(3); + } + + for (i = 0; i < num_fields; i++) + erl_free_term(rowtup[i]); + free(rowtup); + + return rc; +} + +ETERM * +make_rows(unsigned int num_rows, unsigned int num_fields) +{ + ETERM **rows, *rc; + unsigned int i; + + rows = (ETERM **)malloc(num_rows * sizeof(ETERM *)); + if (rows == NULL) { + logmsg("ERROR: Couldn't allocate %d bytes for rows: %s", + strerror(errno)); + exit(3); + } + + for (i = 0; i < num_rows; i++) { + ETERM *rt; + unsigned long *lengths; + MYSQL_ROW row; + + row = mysql_fetch_row(results); + resultoffset++; + lengths = mysql_fetch_lengths(results); + + rt = make_row(row, lengths, num_fields); + rows[i] = erl_format("~w", rt); + erl_free_term(rt); + } + + rc = erl_mk_list(rows, num_rows); + + for (i = 0; i < num_rows; i++) + erl_free_term(rows[i]); + free(rows); + + return rc; +} + +ETERM * +handle_mysql_result() +{ + MYSQL_FIELD *fields; + ETERM *ecols, *erows, *resp; + unsigned int num_fields; + + num_fields = mysql_num_fields(results); + fields = mysql_fetch_fields(results); + + ecols = make_cols(fields, num_fields); + erows = make_rows(numrows, num_fields); + + resp = erl_format("{selected, ~w, ~w}", ecols, erows); + + erl_free_term(ecols); + erl_free_term(erows); + + return resp; +} + +void +handle_connect(ETERM *msg) +{ + ETERM *resp, *tmp; + char *host, *db_name, *user, *passwd; + int port; + + tmp = erl_element(2, msg); + host = erl_iolist_to_string(tmp); + erl_free_term(tmp); + + tmp = erl_element(3, msg); + port = ERL_INT_VALUE(tmp); + erl_free_term(tmp); + + tmp = erl_element(4, msg); + db_name = erl_iolist_to_string(tmp); + erl_free_term(tmp); + + tmp = erl_element(5, msg); + user = erl_iolist_to_string(tmp); + erl_free_term(tmp); + + tmp = erl_element(6, msg); + passwd = erl_iolist_to_string(tmp); + erl_free_term(tmp); + + /* TODO: handle options, passed in next. */ + + logmsg("INFO: Connecting to %s on %s:%d as %s", db_name, host, port, user); + if (mysql_real_connect(&dbh, host, user, passwd, + db_name, port, NULL, 0) == NULL) { + logmsg("ERROR: Failed to connect to database %s as %s: %s.", + db_name, user, mysql_error(&dbh)); + exit(2); + } + + resp = erl_format("ok"); + write_msg(resp); + erl_free_term(resp); +} + +void +handle_query(ETERM *cmd) +{ + ETERM *query, *resp; + char *q; + + query = erl_element(2, cmd); + q = erl_iolist_to_string(query); + erl_free_term(query); + + logmsg("DEBUG: got query msg: %s.", q); + if (mysql_query(&dbh, q)) { + resp = erl_format("{error, {mysql_error, ~i, ~s}}", + mysql_errno(&dbh), mysql_error(&dbh)); + } else { + set_mysql_results(); + if (results) { + resp = handle_mysql_result(); + set_mysql_results(); + } else { + if (mysql_field_count(&dbh) == 0) + resp = erl_format("{updated, ~i}", mysql_affected_rows(&dbh)); + else + resp = erl_format("{error, {mysql_error, ~i, ~s}}", + mysql_errno(&dbh), mysql_error(&dbh)); + } + } + erl_free(q); + + write_msg(resp); + erl_free_term(resp); +} + +/* + * http://dev.mysql.com/doc/refman/5.1/en/mysql-stmt-execute.html + * + * 6 > odbc:param_query(Ref, + * "INSERT INTO EMPLOYEE (NR, FIRSTNAME, " + * "LASTNAME, GENDER) VALUES(?, ?, ?, ?)", + * [{sql_integer,[2,3,4,5,6,7,8]}, + * {{sql_varchar, 20}, + * ["John", "Monica", "Ross", "Rachel", + * "Piper", "Prue", "Louise"]}, + * {{sql_varchar, 20}, + * ["Doe","Geller","Geller", "Green", + * "Halliwell", "Halliwell", "Lane"]}, + * {{sql_char, 1}, ["M","F","M","F","T","F","F"]}]). + * {updated, 7} + */ +void +handle_param_query(ETERM *msg) +{ + ETERM *query, *params, *p, *tmp, *resp; + MYSQL_STMT *sth; + MYSQL_BIND *bind; + char *q; + int param_count, i; + + query = erl_element(2, msg); + q = erl_iolist_to_string(query); + erl_free_term(query); + + params = erl_element(3, msg); + erl_free_term(params); + + logmsg("DEBUG: got param query msg: %s.", q); + + sth = mysql_stmt_init(&dbh); + if (mysql_stmt_prepare(sth, q, strlen(q))) { + resp = erl_format("{error, {mysql_error, ~i, ~s}}", + mysql_errno(&dbh), mysql_error(&dbh)); + } else { + param_count = mysql_stmt_param_count(sth); + if (param_count != erl_length(params)) { + resp = erl_format("{error, {mysql_error, -1, [expected_params, %d, got_params, %d]}}", param_count, erl_length(params)); + } else { + bind = malloc(param_count * sizeof(MYSQL_BIND)); + if (bind == NULL) { + logmsg("ERROR: Couldn't allocate %d bytes for bind params.", + param_count * sizeof(MYSQL_BIND)); + exit(3); + } + memset(bind, 0, param_count * sizeof(MYSQL_BIND)); + + for (i = 0, tmp = params; + (p = erl_hd(tmp)) != NULL && i < 1000; + i++, tmp = erl_tl(tmp)) { + ETERM *type, *value; + + type = erl_element(1, p); + value = erl_element(2, p); + + if (ERL_IS_TUPLE(type)) { + ETERM *t_type, *t_size; + char *t; + + t_size = erl_element(2, type); + bind[i].buffer_length = ERL_INT_VALUE(t_size); + erl_free_term(t_size); + + t_type = erl_element(1, type); + t = (char *)ERL_ATOM_PTR(t_type); + bind[i].length = malloc(sizeof(unsigned long)); + if (strncmp(t, NUMERIC_SQL, strlen(NUMERIC_SQL)) == 0) { + int val; + + bind[i].buffer_type = MYSQL_TYPE_LONG; + *bind[i].length = bind[i].buffer_length * sizeof(int); + bind[i].buffer = malloc(*bind[i].length); + memset(bind[i].buffer, 0, *bind[i].length); + + val = ERL_INT_VALUE(value); + memcpy(bind[i].buffer, &val, *bind[i].length); + } else if (strncmp(t, DECIMAL_SQL, strlen(DECIMAL_SQL)) == 0) { + char *val; + + bind[i].buffer_type = MYSQL_TYPE_STRING; + *bind[i].length = bind[i].buffer_length * sizeof(char *); + bind[i].buffer = malloc(*bind[i].length); + memset(bind[i].buffer, 0, *bind[i].length); + + val = erl_iolist_to_string(value); + if (val) { + memcpy(bind[i].buffer, val, *bind[i].length); + free(val); + } + } else if (strncmp(t, FLOAT_SQL, strlen(FLOAT_SQL)) == 0) { + float val; + + bind[i].buffer_type = MYSQL_TYPE_FLOAT; + *bind[i].length = bind[i].buffer_length * sizeof(float); + bind[i].buffer = malloc(*bind[i].length); + memset(bind[i].buffer, 0, *bind[i].length); + + val = ERL_FLOAT_VALUE(value); + memcpy(bind[i].buffer, &val, *bind[i].length); + } else if (strncmp(t, CHAR_SQL, strlen(CHAR_SQL)) == 0) { + char *val; + + bind[i].buffer_type = MYSQL_TYPE_STRING; + *bind[i].length = bind[i].buffer_length * sizeof(char *); + bind[i].buffer = malloc(*bind[i].length); + memset(bind[i].buffer, 0, *bind[i].length); + + val = erl_iolist_to_string(value); + if (val) { + memcpy(bind[i].buffer, val, *bind[i].length); + free(val); + } + } else if (strncmp(t, VARCHAR_SQL, strlen(VARCHAR_SQL)) == 0) { + char *val; + + bind[i].buffer_type = MYSQL_TYPE_BLOB; + *bind[i].length = bind[i].buffer_length * sizeof(char *); + bind[i].buffer = malloc(*bind[i].length); + memset(bind[i].buffer, 0, *bind[i].length); + + val = erl_iolist_to_string(value); + if (val) { + memcpy(bind[i].buffer, val, *bind[i].length); + free(val); + } + } else { + logmsg("ERROR: Unknown sized type: {%s, %d}", t, + bind[i].buffer_length); + exit(3); + } + erl_free_term(t_type); + } else { + char *t; + + t = (char *)ERL_ATOM_PTR(type); + if (strncmp(t, TIMESTAMP_SQL, strlen(TIMESTAMP_SQL)) == 0) { + bind[i].buffer_type = MYSQL_TYPE_TIMESTAMP; + *bind[i].length = sizeof(MYSQL_TIME); + bind[i].buffer = malloc(*bind[i].length); + memset(bind[i].buffer, 0, *bind[i].length); + + memcpy(bind[i].buffer, value, *bind[i].length); + } else if (strncmp(t, INTEGER_SQL, strlen(INTEGER_SQL)) == 0) { + int val; + + bind[i].buffer_type = MYSQL_TYPE_LONG; + *bind[i].length = sizeof(int); + bind[i].buffer = malloc(*bind[i].length); + memset(bind[i].buffer, 0, *bind[i].length); + + val = ERL_INT_VALUE(value); + memcpy(bind[i].buffer, &val, *bind[i].length); + } else { + logmsg("ERROR: Unknown type: %s", t); + exit(3); + } + } + + bind[i].is_null = malloc(sizeof(int)); + if (ERL_IS_ATOM(value) + && strncmp((char *)ERL_ATOM_PTR(value), + NULL_SQL, strlen(NULL_SQL)) == 0) + memcpy(bind[i].is_null, &TRUTHY, sizeof(int)); + else + memcpy(bind[i].is_null, &FALSY, sizeof(int)); + + erl_free_term(value); + erl_free_term(type); + } + erl_free_term(params); + + if (mysql_stmt_bind_param(sth, bind)) { + resp = erl_format("{error, {mysql_error, ~i, ~s}}", + mysql_errno(&dbh), mysql_error(&dbh)); + } else { + if (mysql_stmt_execute(sth)) { + resp = erl_format("{error, {mysql_error, ~i, ~s}}", + mysql_errno(&dbh), mysql_error(&dbh)); + } else { + set_mysql_results(); + if (results) { + resp = handle_mysql_result(); + set_mysql_results(); + } else { + if (mysql_field_count(&dbh) == 0) + resp = erl_format("{updated, ~i}", mysql_affected_rows(&dbh)); + else + resp = erl_format("{error, {mysql_error, ~i, ~s}}", + mysql_errno(&dbh), mysql_error(&dbh)); + } + } + } + + for (i = 0; i < param_count; i++) { + free(bind[i].buffer); + free(bind[i].is_null); + } + free(bind); + } + } + erl_free(q); + + mysql_stmt_close(sth); + + write_msg(resp); + erl_free_term(resp); +} + +void +handle_select_count(ETERM *msg) +{ + ETERM *query, *resp; + char *q; + + query = erl_element(2, msg); + q = erl_iolist_to_string(query); + erl_free_term(query); + + logmsg("DEBUG: got select count msg: %s.", q); + if (mysql_query(&dbh, q)) { + resp = erl_format("{error, {mysql_error, ~i, ~s}}", + mysql_errno(&dbh), mysql_error(&dbh)); + } else { + set_mysql_results(); + if (results) { + resp = erl_format("{ok, ~i}", numrows); + } else { + if (mysql_field_count(&dbh) == 0) + resp = erl_format("{ok, ~i}", mysql_affected_rows(&dbh)); + else + resp = erl_format("{error, {mysql_error, ~i, ~s}}", + mysql_errno(&dbh), mysql_error(&dbh)); + } + } + erl_free(q); + + write_msg(resp); + erl_free_term(resp); +} + +void +handle_select(ETERM *msg) +{ + MYSQL_FIELD *fields; + ETERM *epos, *enum_items, *ecols, *erows, *resp; + my_ulonglong pos, num_items; + unsigned int num_fields; + + epos = erl_element(2, msg); + enum_items = erl_element(3, msg); + pos = ERL_INT_UVALUE(epos); + num_items = ERL_INT_UVALUE(enum_items); + erl_free_term(enum_items); + erl_free_term(epos); + + logmsg("DEBUG: got select pos: %d, n: %d.", erl_size(msg), pos, num_items); + if (results == NULL) { + logmsg("ERROR: select message w/o cursor."); + exit(2); + } + + num_fields = mysql_num_fields(results); + fields = mysql_fetch_fields(results); + if (resultoffset > 0) + resultoffset = pos - 1; + if (num_items > numrows - resultoffset) + num_items = numrows - resultoffset; + mysql_data_seek(results, resultoffset); + + ecols = make_cols(fields, num_fields); + erows = make_rows(num_items, num_fields); + resp = erl_format("{selected, ~w, ~w}", ecols, erows); + erl_free_term(erows); + + erl_free_term(ecols); + write_msg(resp); + erl_free_term(resp); +} + +void +handle_first(ETERM *msg) +{ + MYSQL_FIELD *fields; + ETERM *ecols, *erows, *resp; + unsigned int num_fields; + + logmsg("DEBUG: got first msg."); + if (results == NULL) { + logmsg("ERROR: got first message w/o cursor."); + exit(2); + } + + num_fields = mysql_num_fields(results); + fields = mysql_fetch_fields(results); + resultoffset = 0; + mysql_data_seek(results, resultoffset); + + ecols = make_cols(fields, num_fields); + erows = make_rows(1, num_fields); + resp = erl_format("{selected, ~w, ~w}", ecols, erows); + erl_free_term(erows); + + erl_free_term(ecols); + write_msg(resp); + erl_free_term(resp); +} + +void +handle_last(ETERM *msg) +{ + MYSQL_FIELD *fields; + ETERM *ecols, *erows, *resp; + unsigned int num_fields; + + logmsg("DEBUG: got last msg."); + if (results == NULL) { + logmsg("ERROR: got last message w/o cursor."); + exit(2); + } + + num_fields = mysql_num_fields(results); + fields = mysql_fetch_fields(results); + resultoffset = numrows - 1; + mysql_data_seek(results, resultoffset); + + ecols = make_cols(fields, num_fields); + erows = make_rows(1, num_fields); + resp = erl_format("{selected, ~w, ~w}", ecols, erows); + erl_free_term(erows); + + erl_free_term(ecols); + write_msg(resp); + erl_free_term(resp); +} + +void +handle_next(ETERM *msg) +{ + MYSQL_FIELD *fields; + ETERM *ecols, *erows, *resp; + unsigned int num_fields; + + logmsg("DEBUG: got next msg."); + if (results == NULL) { + logmsg("ERROR: got next message w/o cursor."); + exit(2); + } + + num_fields = mysql_num_fields(results); + fields = mysql_fetch_fields(results); + + ecols = make_cols(fields, num_fields); + logmsg("resultoffset: %d, num_rows: %d", resultoffset, numrows); + if (resultoffset == numrows) { + resp = erl_format("{selected, ~w, []}", ecols); + } else { + erows = make_rows(1, num_fields); + resp = erl_format("{selected, ~w, ~w}", ecols, erows); + erl_free_term(erows); + } + + erl_free_term(ecols); + write_msg(resp); + erl_free_term(resp); +} + +void +handle_prev(ETERM *msg) +{ + MYSQL_FIELD *fields; + ETERM *ecols, *erows, *resp; + unsigned int num_fields; + + logmsg("DEBUG: got prev msg."); + if (results == NULL) { + logmsg("ERROR: got prev message w/o cursor."); + exit(2); + } + + num_fields = mysql_num_fields(results); + fields = mysql_fetch_fields(results); + + ecols = make_cols(fields, num_fields); + logmsg("resultoffset: %d, num_rows: %d", resultoffset, numrows); + if (resultoffset == 0) { + resp = erl_format("{selected, ~w, []}", ecols); + } else { + resultoffset = resultoffset - 1; + mysql_data_seek(results, resultoffset); + erows = make_rows(1, num_fields); + + /* Rewind to position at the point we returned. */ + resultoffset = resultoffset - 1; + mysql_data_seek(results, resultoffset); + resp = erl_format("{selected, ~w, ~w}", ecols, erows); + erl_free_term(erows); + } + + erl_free_term(ecols); + write_msg(resp); + erl_free_term(resp); +} + +void +dispatch_db_cmd(ETERM *msg) +{ + ETERM *tag; + char *tag_name; + + tag = erl_element(1, msg); + tag_name = (char *)ERL_ATOM_PTR(tag); + if (strncmp(tag_name, CONNECT_MSG, strlen(CONNECT_MSG)) == 0) + handle_connect(msg); + else if (strncmp(tag_name, QUERY_MSG, strlen(QUERY_MSG)) == 0) + handle_query(msg); + else if (strncmp(tag_name, PARAM_QUERY_MSG, strlen(PARAM_QUERY_MSG)) == 0) + handle_param_query(msg); + else if (strncmp(tag_name, SELECT_COUNT_MSG, strlen(SELECT_COUNT_MSG)) == 0) + handle_select_count(msg); + else if (strncmp(tag_name, SELECT_MSG, strlen(SELECT_MSG)) == 0) + handle_select(msg); + else if (strncmp(tag_name, FIRST_MSG, strlen(FIRST_MSG)) == 0) + handle_first(msg); + else if (strncmp(tag_name, LAST_MSG, strlen(LAST_MSG)) == 0) + handle_last(msg); + else if (strncmp(tag_name, NEXT_MSG, strlen(NEXT_MSG)) == 0) + handle_next(msg); + else if (strncmp(tag_name, PREV_MSG, strlen(PREV_MSG)) == 0) + handle_prev(msg); + else { + logmsg("WARNING: message type %s unknown.", (char *)ERL_ATOM_PTR(tag)); + erl_free_term(tag); + exit(3); + } + + erl_free_term(tag); +} + +int +main(int argc, char *argv[]) +{ + ETERM *msg; + + openlog(); + logmsg("INFO: starting up."); + erl_init(NULL, 0); + + mysql_init(&dbh); + while ((msg = read_msg()) != NULL) { + dispatch_db_cmd(msg); + erl_free_term(msg); + } + mysql_close(&dbh); + + logmsg("INFO: shutting down."); + closelog(); + + return 0; +} diff --git a/src/mysqlerl.erl b/src/mysqlerl.erl new file mode 100644 index 0000000..946e9c5 --- /dev/null +++ b/src/mysqlerl.erl @@ -0,0 +1,251 @@ +%% Modeled from ODBC +%% http://www.erlang.org/doc/apps/odbc/ + +-module(mysqlerl). +-author('bjc@kublai.com'). + +-include("mysqlerl.hrl"). + +-export([convert_type/1]). + +-export([test_start/0, test_msg/0, test_query/0, test_param_query/0]). + +-export([start/0, start/1, stop/0, commit/2, commit/3, + connect/6, disconnect/1, describe_table/2, + describe_table/3, first/1, first/2, + last/1, last/2, next/1, next/2, prev/1, + prev/2, select_count/2, select_count/3, + select/3, select/4, param_query/3, param_query/4, + sql_query/2, sql_query/3]). + +-define(CONFIG, "/Users/bjc/tmp/test-server.cfg"). + +test_start() -> + {ok, [{Host, Port, DB, User, Pass, Options}]} = file:consult(?CONFIG), + mysqlerl:connect(Host, Port, DB, User, Pass, Options). + +test_msg() -> + commit(mysqlerl_connection_sup:random_child(), + rollback, 2000). + +test_query() -> + sql_query(mysqlerl_connection_sup:random_child(), + "SELECT COUNT(*) FROM user", 2000). + +test_param_query() -> + %% This should really be an update or something, since that's how + %% it'll be used. + param_query(mysqlerl_connection_sup:random_child(), + "SELECT * FROM user WHERE username=?", + [{{sql_varchar, 20}, "bjc"}]). + +start() -> + start(temporary). + +%% Arguments: +%% Type = permanent | transient | temporary +%% +%% Returns: +%% ok | {error, Reason} +start(Type) -> + application:start(sasl), + application:start(mysqlerl, Type). + +stop() -> + application:stop(mysqlerl). + +commit(Ref, CommitMode) -> + commit(Ref, CommitMode, infinity). + +%% Arguments: +%% Ref = connection_reference() +%% Timeout = time_out() +%% CommitMode = commit | rollback +%% Reason = not_an_explicit_commit_connection | +%% process_not_owner_of_odbc_connection | +%% common_reason() +%% ok | {error, Reason} +commit(Ref, commit, Timeout) -> + case sql_query(Ref, "COMMIT", Timeout) of + {num_rows, _} -> ok; + Other -> Other + end; +commit(Ref, rollback, Timeout) -> + case sql_query(Ref, "ROLLBACK", Timeout) of + {num_rows, _} -> ok; + Other -> Other + end. + +%% Arguments: +%% Host = string() +%% Port = integer() +%% Database = string() +%% User = string() +%% Password = string() +%% Options = list() +%% +%% Returns: +%% {ok, Ref} | {error, Reason} +%% Ref = connection_reference() +connect(Host, Port, Database, User, Password, Options) -> + mysqlerl_connection_sup:connect(Host, Port, Database, + User, Password, Options). + +%% Arguments: +%% Ref = connection_reference() +%% +%% Returns: +%% ok | {error, Reason} +disconnect(Ref) -> + mysqlerl_connection:stop(Ref). + +describe_table(Ref, Table) -> + describe_table(Ref, Table, infinity). + +%% Arguments: +%% Ref = connection_reference() +%% Table = string() +%% Timeout = time_out() +%% +%% Returns: +%% {ok, Description} | {error, Reason} +%% Description = [{col_name(), odbc_data_type()}] +describe_table(Ref, Table, Timeout) -> + Q = ["DESCRIBE ", Table], + {selected, _, Rows} = sql_query(Ref, Q, Timeout), + Description = [{Name, convert_type(T)} || {Name, T, _, _, _, _} <- Rows], + {ok, Description}. + +first(Ref) -> + first(Ref, infinity). + +%% Arguments: +%% Ref = connection_reference() +%% Timeout = time_out() +%% Returns: +%% {selected, ColNames, Rows} | {error, Reason} +%% Rows = rows() +first(Ref, Timeout) -> + conn_fwd(Ref, #sql_first{}, Timeout). + +last(Ref) -> + last(Ref, infinity). + +%% Arguments: +%% Ref = connection_reference() +%% Timeout = time_out() +%% Returns: +%% {selected, ColNames, Rows} | {error, Reason} +%% Rows = rows() +last(Ref, Timeout) -> + conn_fwd(Ref, #sql_last{}, Timeout). + +next(Ref) -> + next(Ref, infinity). + +%% Arguments: +%% Ref = connection_reference() +%% Timeout = time_out() +%% Returns: +%% {selected, ColNames, Rows} | {error, Reason} +%% Rows = rows() +next(Ref, Timeout) -> + conn_fwd(Ref, #sql_next{}, Timeout). + +prev(Ref) -> + prev(Ref, infinity). + +%% Arguments: +%% Ref = connection_reference() +%% Timeout = time_out() +%% Returns: +%% {selected, ColNames, Rows} | {error, Reason} +%% Rows = rows() +prev(Ref, Timeout) -> + conn_fwd(Ref, #sql_prev{}, Timeout). + +select_count(Ref, SQLQuery) -> + select_count(Ref, SQLQuery, infinity). + +%% Arguments: +%% Ref = connection_reference() +%% SQLQuery = string() +%% Timeout = time_out() +%% Returns: +%% {ok, NrRows} | {error, Reason} +%% NrRows = n_rows() +select_count(Ref, SQLQuery, Timeout) -> + conn_fwd(Ref, #sql_select_count{q = SQLQuery}, Timeout). + +select(Ref, Pos, N) -> + select(Ref, Pos, N, infinity). + +%% Arguments: +%% Ref = connection_reference() +%% Pos = integer() +%% Timeout = time_out() +%% Returns: +%% {selected, ColNames, Rows} | {error, Reason} +%% Rows = rows() +select(Ref, Pos, N, Timeout) -> + conn_fwd(Ref, #sql_select{pos = Pos, n = N}, Timeout). + +param_query(Ref, SQLQuery, Params) -> + param_query(Ref, SQLQuery, Params, infinity). + +%% Arguments: +%% Ref = connection_reference() +%% SQLQuery = string() +%% Params = [{odbc_data_type(), [value()]}] +%% Timeout = time_out() +%% Returns: +%% {selected, ColNames, Rows} | {error, Reason} +%% Rows = rows() +param_query(Ref, SQLQuery, Params, Timeout) -> + conn_fwd(Ref, #sql_param_query{q = SQLQuery, params = Params}, Timeout). + +sql_query(Ref, SQLQuery) -> + sql_query(Ref, SQLQuery, infinity). + +%% Arguments: +%% Ref = connection_reference() +%% SQLQuery = string() +%% Timeout = time_out() +%% Returns: +%% {selected, ColNames, Rows} | {error, Reason} +%% Rows = rows() +sql_query(Ref, SQLQuery, Timeout) -> + conn_fwd(Ref, #sql_query{q = SQLQuery}, Timeout). + +conn_fwd(Ref, Msg, Timeout) -> + gen_server:call(Ref, {Msg, Timeout}, infinity). + +%% Convert type needs some love! Cover all bases here instead of +%% fudging. +convert_type("timestamp") -> + sql_timestamp; +convert_type("int") -> + sql_integer; +convert_type("int(" ++ Rest) -> + Size = find_data_size(Rest), + {sql_numeric, list_to_integer(Size)}; +convert_type("decimal(" ++ Rest) -> + Size = find_data_size(Rest), + {sql_decimal, list_to_integer(Size)}; +convert_type("float(" ++ Rest) -> + Size = find_data_size(Rest), + {sql_float, list_to_float(Size)}; +convert_type("char(" ++ Rest) -> + Size = find_data_size(Rest), + {sql_char, list_to_integer(Size)}; +convert_type("varchar(" ++ Rest) -> + Size = find_data_size(Rest), + {sql_varchar, list_to_integer(Size)}. + +find_data_size(Str) -> + find_data_size(Str, []). + +find_data_size([$) | _Rest], Accum) -> + lists:reverse(Accum); +find_data_size([H | T], Accum) -> + find_data_size(T, [H | Accum]). diff --git a/src/mysqlerl.hrl b/src/mysqlerl.hrl new file mode 100644 index 0000000..99e674f --- /dev/null +++ b/src/mysqlerl.hrl @@ -0,0 +1,9 @@ +-record(sql_connect, {host, port, database, user, password, options}). +-record(sql_query, {q}). +-record(sql_param_query, {q, params}). +-record(sql_select_count, {q}). +-record(sql_select, {pos, n}). +-record(sql_first, {}). +-record(sql_last, {}). +-record(sql_next, {}). +-record(sql_prev, {}). diff --git a/src/mysqlerl_app.erl b/src/mysqlerl_app.erl new file mode 100644 index 0000000..cdb8ade --- /dev/null +++ b/src/mysqlerl_app.erl @@ -0,0 +1,14 @@ +-module(mysqlerl_app). +-author('bjc@kublai.com'). + +-behavior(application). + +%% Behavior callbacks. +-export([start/2, stop/1]). + +start(normal, []) -> + register(?MODULE, self()), + mysqlerl_sup:start_link(). + +stop([]) -> + ok. diff --git a/src/mysqlerl_connection.erl b/src/mysqlerl_connection.erl new file mode 100644 index 0000000..1a3d900 --- /dev/null +++ b/src/mysqlerl_connection.erl @@ -0,0 +1,64 @@ +-module(mysqlerl_connection). +-author('bjc@kublai.com'). + +-include("mysqlerl.hrl"). +-include("mysqlerl_port.hrl"). + +-behavior(gen_server). + +-export([start_link/7, stop/1]). + +-export([init/1, terminate/2, code_change/3, + handle_call/3, handle_cast/2, handle_info/2]). + +-record(state, {sup, owner}). + +start_link(Owner, Host, Port, Database, User, Password, Options) -> + gen_server:start_link(?MODULE, [Owner, Host, Port, Database, + User, Password, Options], []). + +stop(Pid) -> + gen_server:call(Pid, stop). + +init([Owner, Host, Port, Database, User, Password, Options]) -> + process_flag(trap_exit, true), + link(Owner), + {ok, Sup} = mysqlerl_port_sup:start_link(helper(), Host, Port, Database, + User, Password, Options), + {ok, #state{sup = Sup, owner = Owner}}. + +terminate(Reason, _State) -> + io:format("DEBUG: connection got terminate: ~p~n", [Reason]), + ok. + +code_change(_OldVsn, State, _Extra) -> + {ok, State}. + +handle_call(Request, From, #state{owner = Owner} = State) + when Owner /= element(1, From) -> + error_logger:warning_msg("Request from ~p (owner: ~p): ~p", + [element(1, From), Owner, Request]), + {reply, {error, process_not_owner_of_odbc_connection}, State}; +handle_call(stop, _From, State) -> + {stop, normal, State}; +handle_call(Request, _From, State) -> + {reply, gen_server:call(port_ref(State#state.sup), + #req{request = Request}, infinity), State}. + +handle_cast(_Request, State) -> + {noreply, State}. + +handle_info({'EXIT', Pid, _Reason}, #state{owner = Pid} = State) -> + io:format("DEBUG: owner ~p shut down.~n", [Pid]), + {stop, normal, State}. + +helper() -> + case code:priv_dir(mysqlerl) of + PrivDir when is_list(PrivDir) -> ok; + {error, bad_name} -> PrivDir = filename:join(["..", "priv"]) + end, + filename:join([PrivDir, "mysqlerl"]). + +port_ref(Sup) -> + [{mysqlerl_port, Ref, worker, _}] = supervisor:which_children(Sup), + Ref. diff --git a/src/mysqlerl_connection_sup.erl b/src/mysqlerl_connection_sup.erl new file mode 100644 index 0000000..6e1632a --- /dev/null +++ b/src/mysqlerl_connection_sup.erl @@ -0,0 +1,31 @@ +-module(mysqlerl_connection_sup). +-author('bjc@kublai.com'). + +-behavior(supervisor). + +-export([random_child/0]). +-export([start_link/0, connect/6]). + +-export([init/1]). + +start_link() -> + supervisor:start_link({local, ?MODULE}, ?MODULE, []). + +connect(Host, Port, Database, User, Password, Options) -> + supervisor:start_child(?MODULE, [self(), Host, Port, Database, + User, Password, Options]). + +random_child() -> + case get_pids() of + [] -> {error, no_connections}; + Pids -> lists:nth(erlang:phash(now(), length(Pids)), Pids) + end. + +init([]) -> + Connection = {undefined, {mysqlerl_connection, start_link, []}, + transient, 5, worker, [mysqlerl_connection]}, + {ok, {{simple_one_for_one, 10, 5}, + [Connection]}}. + +get_pids() -> + [Pid || {_Id, Pid, _Type, _Modules} <- supervisor:which_children(?MODULE)]. diff --git a/src/mysqlerl_port.erl b/src/mysqlerl_port.erl new file mode 100644 index 0000000..74fe177 --- /dev/null +++ b/src/mysqlerl_port.erl @@ -0,0 +1,83 @@ +-module(mysqlerl_port). +-author('bjc@kublai.com'). + +-include("mysqlerl.hrl"). +-include("mysqlerl_port.hrl"). + +-behavior(gen_server). + +-export([start_link/7]). +-export([init/1, terminate/2, code_change/3, + handle_call/3, handle_cast/2, handle_info/2]). + +-define(CONNECT_TIMEOUT, 30000). + +-record(state, {ref}). +-record(port_closed, {reason}). + +start_link(Cmd, Host, Port, Database, User, Password, Options) -> + gen_server:start_link(?MODULE, + [Cmd, Host, Port, Database, User, Password, Options], + []). + +init([Cmd, Host, Port, Database, User, Password, Options]) -> + process_flag(trap_exit, true), + Ref = open_port({spawn, Cmd}, [{packet, 4}, binary]), + {data, ok} = send_port_cmd(Ref, #sql_connect{host = Host, + port = Port, + database = Database, + user = User, + password = Password, + options = Options}, + ?CONNECT_TIMEOUT), + {ok, #state{ref = Ref}}. + +terminate(#port_closed{reason = Reason}, #state{ref = Ref}) -> + io:format("DEBUG: mysqlerl connection ~p shutting down (~p).~n", + [Ref, Reason]), + ok; +terminate(Reason, State) -> + catch port_close(State#state.ref), + io:format("DEBUG: mysqlerl_port got terminate: ~p~n", [Reason]), + ok. + +code_change(_OldVsn, State, _Extra) -> + {ok, State}. + +handle_call(#req{request = {Request, Timeout}}, From, + #state{ref = Ref} = State) -> + case send_port_cmd(Ref, Request, Timeout) of + {data, Res} -> + {reply, Res, State}; + {'EXIT', Ref, Reason} -> + gen_server:reply(From, {error, connection_closed}), + {stop, #port_closed{reason = Reason}, State}; + timeout -> + gen_server:reply(From, timeout), + {stop, timeout, State}; + Other -> + error_logger:warning_msg("Got unknown query response: ~p~n", + [Other]), + gen_server:reply(From, {error, connection_closed}), + {stop, {unknownreply, Other}, State} + end. + + +handle_cast(_Request, State) -> + {noreply, State}. + +handle_info({'EXIT', Ref, Reason}, #state{ref = Ref} = State) -> + io:format("DEBUG: Port ~p closed on ~p.~n", [Ref, State]), + {stop, #port_closed{reason = Reason}, State}. + + +send_port_cmd(Ref, Request, Timeout) -> + io:format("DEBUG: Sending request: ~p~n", [Request]), + port_command(Ref, term_to_binary(Request)), + receive + {Ref, {data, Res}} -> + {data, binary_to_term(Res)}; + Other -> Other + after Timeout -> + timeout + end. diff --git a/src/mysqlerl_port.hrl b/src/mysqlerl_port.hrl new file mode 100644 index 0000000..a7a3300 --- /dev/null +++ b/src/mysqlerl_port.hrl @@ -0,0 +1 @@ +-record(req, {request}). diff --git a/src/mysqlerl_port_sup.erl b/src/mysqlerl_port_sup.erl new file mode 100644 index 0000000..3053cdc --- /dev/null +++ b/src/mysqlerl_port_sup.erl @@ -0,0 +1,18 @@ +-module(mysqlerl_port_sup). +-author('bjc@kublai.com'). + +-behavior(supervisor). + +-export([start_link/7]). +-export([init/1]). + +start_link(Cmd, Host, Port, Database, User, Password, Options) -> + supervisor:start_link(?MODULE, [Cmd, Host, Port, Database, + User, Password, Options]). + +init([Cmd, Host, Port, Database, User, Password, Options]) -> + Ref = {mysqlerl_port, {mysqlerl_port, start_link, + [Cmd, Host, Port, Database, + User, Password, Options]}, + transient, 5, worker, [mysqlerl_port]}, + {ok, {{one_for_one, 10, 5}, [Ref]}}. diff --git a/src/mysqlerl_sup.erl b/src/mysqlerl_sup.erl new file mode 100644 index 0000000..1ebfbf2 --- /dev/null +++ b/src/mysqlerl_sup.erl @@ -0,0 +1,16 @@ +-module(mysqlerl_sup). +-author('bjc@kublai.com'). + +-behavior(supervisor). + +-export([start_link/0, init/1]). + +start_link() -> + supervisor:start_link({local, ?MODULE}, ?MODULE, []). + +init([]) -> + ConnectionSup = {mysqlerl_connection_sup, + {mysqlerl_connection_sup, start_link, []}, + permanent, infinity, supervisor, + [mysqlerl_connection_sup]}, + {ok, {{one_for_one, 10, 5}, [ConnectionSup]}}. |