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-rw-r--r--src/mysqlerl.c704
1 files changed, 704 insertions, 0 deletions
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;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-19 06:33:34 +0000