X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;ds=sidebyside;f=src%2Ftools%2Fsysdb%2Finput.c;h=898464af0b550118aa0367337a4e4b85460930c6;hb=b6c730c2d0cf400127da5ca96b51abd4ad335c0c;hp=e08ad5b40da52d63ce9b16ebda9e0916193b6db0;hpb=3cc3e3c36239c902263678100180c95c8263f7f8;p=sysdb.git

diff --git a/src/tools/sysdb/input.c b/src/tools/sysdb/input.c
index e08ad5b..898464a 100644
--- a/src/tools/sysdb/input.c
+++ b/src/tools/sysdb/input.c
@@ -25,6 +25,21 @@
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+/*
+ * This module implements the core of the command line tool. It handles all
+ * input from the user and the remote server, interacting with the scanner and
+ * command handling as needed.
+ *
+ * The main loop is managed by the flex scanner which parses the user input.
+ * It will call into this module (using sdb_input_readline()) whenever it
+ * needs further input to continue parsing. Whenever it finds a full query
+ * (terminated by a semicolon), it will hand the query back to this module
+ * (using sdb_input_exec_query()) which will then execute it.
+ *
+ * Most of the process life-time will be spend waiting for input. User input
+ * and (asynchronous) server replies are handled at the same time.
+ */
+
 #if HAVE_CONFIG_H
 #	include "config.h"
 #endif /* HAVE_CONFIG_H */
@@ -32,13 +47,21 @@
 #include "tools/sysdb/input.h"
 #include "tools/sysdb/command.h"
 
+#include "utils/error.h"
 #include "utils/strbuf.h"
 
+#include <errno.h>
+
+#include <sys/select.h>
+
 #include <stdio.h>
 #include <stdlib.h>
 
 #include <string.h>
 
+#include <termios.h>
+#include <unistd.h>
+
 #if HAVE_EDITLINE_READLINE_H
 #	include <editline/readline.h>
 #	if HAVE_EDITLINE_HISTORY_H
@@ -56,38 +79,145 @@
 #	endif
 #endif /* READLINEs */
 
+extern int yylex(void);
+
 /*
  * public variables
  */
 
 sdb_input_t *sysdb_input = NULL;
 
+/*
+ * private variables
+ */
+
+static struct termios orig_term_attrs;
+static bool have_orig_term_attrs;
+
 /*
  * private helper functions
  */
 
-static size_t
+static void
+reset_term_attrs(void)
+{
+	tcsetattr(STDIN_FILENO, TCSANOW, &orig_term_attrs);
+} /* reset_term_attrs */
+
+static void
+term_rawmode(void)
+{
+	struct termios attrs;
+
+	if (! have_orig_term_attrs) {
+		memset(&orig_term_attrs, 0, sizeof(orig_term_attrs));
+		tcgetattr(STDIN_FILENO, &orig_term_attrs);
+		atexit(reset_term_attrs);
+		have_orig_term_attrs = 1;
+	}
+
+	/* setup terminal to operate in non-canonical mode
+	 * and single character input */
+	memset(&attrs, 0, sizeof(attrs));
+	tcgetattr(STDIN_FILENO, &attrs);
+	attrs.c_lflag &= (tcflag_t)(~ICANON);
+	attrs.c_cc[VMIN] = 1;
+	tcsetattr(STDIN_FILENO, TCSANOW, &attrs);
+} /* term_rawmode */
+
+static void
+handle_input(char *line)
+{
+	if (! line) {
+		sysdb_input->eof = 1;
+		return;
+	}
+
+	sdb_strbuf_append(sysdb_input->input, "%s\n", line);
+	free(line);
+
+	if (sysdb_input->interactive)
+		rl_callback_handler_remove();
+} /* handle_input */
+
+/* wait for a new line of data to be available */
+static ssize_t
 input_readline(void)
 {
+	size_t len;
+
+	fd_set fds;
+	int client_fd;
+
 	const char *prompt = "sysdb=> ";
-	char *line;
 
-	size_t len;
+	len = sdb_strbuf_len(sysdb_input->input);
 
-	if (sysdb_input->query_len)
+	if (! sysdb_input->interactive) {
+		char *line = readline("");
+		handle_input(line);
+		return (ssize_t)(sdb_strbuf_len(sysdb_input->input) - len);
+	}
+
+	if (sysdb_input->have_input)
 		prompt = "sysdb-> ";
+	if (sdb_client_eof(sysdb_input->client))
+		prompt = "!-> ";
 
-	line = readline(prompt);
+	rl_callback_handler_install(prompt, handle_input);
+	client_fd = sdb_client_sockfd(sysdb_input->client);
+	while ((sdb_strbuf_len(sysdb_input->input) == len)
+			&& (! sysdb_input->eof)) {
+		bool connected = !sdb_client_eof(sysdb_input->client);
+		int max_fd, n;
 
-	if (! line)
-		return 0;
+		/* XXX: some versions of libedit don't properly reset the terminal in
+		 * rl_callback_read_char(); detect those versions */
+		term_rawmode();
 
-	len = strlen(line) + 1;
+		FD_ZERO(&fds);
+		FD_SET(STDIN_FILENO, &fds);
+		max_fd = STDIN_FILENO;
 
-	sdb_strbuf_append(sysdb_input->input, line);
-	sdb_strbuf_append(sysdb_input->input, "\n");
-	free(line);
-	return len;
+		if (connected) {
+			FD_SET(client_fd, &fds);
+			if (client_fd > max_fd)
+				max_fd = client_fd;
+		}
+
+		n = select(max_fd + 1, &fds, NULL, NULL, /* timeout = */ NULL);
+		if (n < 0)
+			return (ssize_t)n;
+		else if (! n)
+			continue;
+
+		/* handle user input with highest priority */
+		if (FD_ISSET(STDIN_FILENO, &fds)) {
+			rl_callback_read_char();
+			continue;
+		}
+
+		if ((! connected) || (! FD_ISSET(client_fd, &fds)))
+			continue;
+
+		/* some response / error message from the server pending */
+		/* XXX: clear current line */
+		printf("\n");
+		sdb_command_print_reply(sysdb_input->client);
+
+		if (sdb_client_eof(sysdb_input->client)) {
+			rl_callback_handler_remove();
+			/* XXX */
+			printf("Remote side closed the connection.\n");
+			/* return EOF -> restart scanner */
+			return 0;
+		}
+		else
+			rl_forced_update_display();
+	}
+
+	/* new data available */
+	return (ssize_t)(sdb_strbuf_len(sysdb_input->input) - len);
 } /* input_readline */
 
 /*
@@ -99,11 +229,24 @@ sdb_input_init(sdb_input_t *input)
 {
 	/* register input handler */
 	sysdb_input = input;
+
+	input->interactive = isatty(STDIN_FILENO) != 0;
+	errno = 0;
+	if (input->interactive)
+		term_rawmode();
 	return 0;
 } /* sdb_input_init */
 
+int
+sdb_input_mainloop(void)
+{
+	while (! sysdb_input->eof)
+		yylex();
+	return 0;
+} /* sdb_input_mainloop */
+
 ssize_t
-sdb_input_readline(char *buf, int *n_chars, size_t max_chars)
+sdb_input_readline(char *buf, size_t *n_chars, size_t max_chars)
 {
 	const char *data;
 	size_t len;
@@ -111,12 +254,12 @@ sdb_input_readline(char *buf, int *n_chars, size_t max_chars)
 	len = sdb_strbuf_len(sysdb_input->input) - sysdb_input->tokenizer_pos;
 
 	if (! len) {
-		size_t n = input_readline();
-		if (! n) {
+		ssize_t n = input_readline();
+		if (n <= 0) {
 			*n_chars = 0; /* YY_NULL */
-			return 0;
+			return n;
 		}
-		len += n;
+		len += (size_t)n;
 	}
 
 	len = (len < max_chars) ? len : max_chars;
@@ -130,26 +273,46 @@ sdb_input_readline(char *buf, int *n_chars, size_t max_chars)
 } /* sdb_input_readline */
 
 int
-sdb_input_exec_query()
+sdb_input_exec_query(void)
 {
-	char *query = sdb_command_exec(sysdb_input);
+	char *query = NULL;
 
-	HIST_ENTRY *current_hist;
-	const char *hist_line = NULL;
+	HIST_ENTRY *hist;
+	const char *prev = NULL;
 
+	if (! sysdb_input->have_input) {
+		/* empty line */
+		if (sdb_client_eof(sysdb_input->client))
+			sdb_input_reconnect();
+		return 0;
+	}
+
+	query = sdb_command_exec(sysdb_input);
 	if (! query)
 		return -1;
 
-	current_hist = current_history();
-	if (current_hist)
-		hist_line = current_hist->line;
+	hist = history_get(history_length);
+	if (hist)
+		prev = hist->line;
 
 	if (*query != ' ')
-		if ((! hist_line) || strcmp(hist_line, query))
+		if ((! prev) || strcmp(prev, query))
 			add_history(query);
 	free(query);
 	return 0;
 } /* sdb_input_exec_query */
 
+int
+sdb_input_reconnect(void)
+{
+	sdb_client_close(sysdb_input->client);
+	if (sdb_client_connect(sysdb_input->client, sysdb_input->user)) {
+		printf("Failed to reconnect to SysDBd.\n");
+		return -1;
+	}
+	printf("Successfully reconnected to SysDBd.\n");
+	return 0;
+} /* sdb_input_reconnect */
+
 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */