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authorJonathan Tan <jonathantanmy@google.com>2019-01-16 19:28:13 (GMT)
committerJunio C Hamano <gitster@pobox.com>2019-01-17 19:25:07 (GMT)
commitfbd76cd450e6675cbd5d48da3c53fa446b776475 (patch)
tree61be5a085f296813ac98dc99353057140bbefd0f
parentbc2e795cea607e444a9f985b0dbed5a4d25921c8 (diff)
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sideband: reverse its dependency on pkt-line
A subsequent patch will teach struct packet_reader a new field that, if set, instructs it to interpret read data as multiplexed. This will create a dependency from pkt-line to sideband. To avoid a circular dependency, split recv_sideband() into 2 parts: the reading loop (left in recv_sideband()) and the processing of the contents (in demultiplex_sideband()), and move the former into pkt-line. This reverses the direction of dependency: sideband no longer depends on pkt-line, and pkt-line now depends on sideband. Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r--pkt-line.c23
-rw-r--r--pkt-line.h16
-rw-r--r--sideband.c173
-rw-r--r--sideband.h24
4 files changed, 141 insertions, 95 deletions
diff --git a/pkt-line.c b/pkt-line.c
index 9d3e402..321ff63 100644
--- a/pkt-line.c
+++ b/pkt-line.c
@@ -439,6 +439,29 @@ ssize_t read_packetized_to_strbuf(int fd_in, struct strbuf *sb_out)
return sb_out->len - orig_len;
}
+int recv_sideband(const char *me, int in_stream, int out)
+{
+ char buf[LARGE_PACKET_MAX + 1];
+ int len;
+ struct strbuf scratch = STRBUF_INIT;
+ enum sideband_type sideband_type;
+
+ while (1) {
+ len = packet_read(in_stream, NULL, NULL, buf, LARGE_PACKET_MAX,
+ 0);
+ if (!demultiplex_sideband(me, buf, len, &scratch,
+ &sideband_type))
+ continue;
+ switch (sideband_type) {
+ case SIDEBAND_PRIMARY:
+ write_or_die(out, buf + 1, len - 1);
+ break;
+ default: /* errors: message already written */
+ return sideband_type;
+ }
+ }
+}
+
/* Packet Reader Functions */
void packet_reader_init(struct packet_reader *reader, int fd,
char *src_buffer, size_t src_len,
diff --git a/pkt-line.h b/pkt-line.h
index 023ad29..a8e92a4 100644
--- a/pkt-line.h
+++ b/pkt-line.h
@@ -3,6 +3,7 @@
#include "git-compat-util.h"
#include "strbuf.h"
+#include "sideband.h"
/*
* Write a packetized stream, where each line is preceded by
@@ -120,6 +121,21 @@ char *packet_read_line_buf(char **src_buf, size_t *src_len, int *size);
*/
ssize_t read_packetized_to_strbuf(int fd_in, struct strbuf *sb_out);
+/*
+ * Receive multiplexed output stream over git native protocol.
+ * in_stream is the input stream from the remote, which carries data
+ * in pkt_line format with band designator. Demultiplex it into out
+ * and err and return error appropriately. Band #1 carries the
+ * primary payload. Things coming over band #2 is not necessarily
+ * error; they are usually informative message on the standard error
+ * stream, aka "verbose"). A message over band #3 is a signal that
+ * the remote died unexpectedly. A flush() concludes the stream.
+ *
+ * Returns SIDEBAND_FLUSH upon a normal conclusion, and SIDEBAND_PROTOCOL_ERROR
+ * or SIDEBAND_REMOTE_ERROR if an error occurred.
+ */
+int recv_sideband(const char *me, int in_stream, int out);
+
struct packet_reader {
/* source file descriptor */
int fd;
diff --git a/sideband.c b/sideband.c
index 368647a..e89d677 100644
--- a/sideband.c
+++ b/sideband.c
@@ -1,7 +1,6 @@
#include "cache.h"
#include "color.h"
#include "config.h"
-#include "pkt-line.h"
#include "sideband.h"
#include "help.h"
@@ -109,109 +108,99 @@ static void maybe_colorize_sideband(struct strbuf *dest, const char *src, int n)
}
-/*
- * Receive multiplexed output stream over git native protocol.
- * in_stream is the input stream from the remote, which carries data
- * in pkt_line format with band designator. Demultiplex it into out
- * and err and return error appropriately. Band #1 carries the
- * primary payload. Things coming over band #2 is not necessarily
- * error; they are usually informative message on the standard error
- * stream, aka "verbose"). A message over band #3 is a signal that
- * the remote died unexpectedly. A flush() concludes the stream.
- */
-
#define DISPLAY_PREFIX "remote: "
#define ANSI_SUFFIX "\033[K"
#define DUMB_SUFFIX " "
-int recv_sideband(const char *me, int in_stream, int out)
+int demultiplex_sideband(const char *me, char *buf, int len,
+ struct strbuf *scratch,
+ enum sideband_type *sideband_type)
{
- const char *suffix;
- char buf[LARGE_PACKET_MAX + 1];
- struct strbuf outbuf = STRBUF_INIT;
- int retval = 0;
-
- if (isatty(2) && !is_terminal_dumb())
- suffix = ANSI_SUFFIX;
- else
- suffix = DUMB_SUFFIX;
-
- while (!retval) {
- const char *b, *brk;
- int band, len;
- len = packet_read(in_stream, NULL, NULL, buf, LARGE_PACKET_MAX, 0);
- if (len == 0)
- break;
- if (len < 1) {
- strbuf_addf(&outbuf,
- "%s%s: protocol error: no band designator",
- outbuf.len ? "\n" : "", me);
- retval = SIDEBAND_PROTOCOL_ERROR;
- break;
- }
- band = buf[0] & 0xff;
- buf[len] = '\0';
- len--;
- switch (band) {
- case 3:
- strbuf_addf(&outbuf, "%s%s", outbuf.len ? "\n" : "",
- DISPLAY_PREFIX);
- maybe_colorize_sideband(&outbuf, buf + 1, len);
-
- retval = SIDEBAND_REMOTE_ERROR;
- break;
- case 2:
- b = buf + 1;
-
- /*
- * Append a suffix to each nonempty line to clear the
- * end of the screen line.
- *
- * The output is accumulated in a buffer and
- * each line is printed to stderr using
- * write(2) to ensure inter-process atomicity.
- */
- while ((brk = strpbrk(b, "\n\r"))) {
- int linelen = brk - b;
-
- if (!outbuf.len)
- strbuf_addstr(&outbuf, DISPLAY_PREFIX);
- if (linelen > 0) {
- maybe_colorize_sideband(&outbuf, b, linelen);
- strbuf_addstr(&outbuf, suffix);
- }
-
- strbuf_addch(&outbuf, *brk);
- xwrite(2, outbuf.buf, outbuf.len);
- strbuf_reset(&outbuf);
-
- b = brk + 1;
- }
+ static const char *suffix;
+ const char *b, *brk;
+ int band;
+
+ if (!suffix) {
+ if (isatty(2) && !is_terminal_dumb())
+ suffix = ANSI_SUFFIX;
+ else
+ suffix = DUMB_SUFFIX;
+ }
- if (*b) {
- strbuf_addstr(&outbuf, outbuf.len ?
- "" : DISPLAY_PREFIX);
- maybe_colorize_sideband(&outbuf, b, strlen(b));
+ if (len == 0) {
+ *sideband_type = SIDEBAND_FLUSH;
+ goto cleanup;
+ }
+ if (len < 1) {
+ strbuf_addf(scratch,
+ "%s%s: protocol error: no band designator",
+ scratch->len ? "\n" : "", me);
+ *sideband_type = SIDEBAND_PROTOCOL_ERROR;
+ goto cleanup;
+ }
+ band = buf[0] & 0xff;
+ buf[len] = '\0';
+ len--;
+ switch (band) {
+ case 3:
+ strbuf_addf(scratch, "%s%s", scratch->len ? "\n" : "",
+ DISPLAY_PREFIX);
+ maybe_colorize_sideband(scratch, buf + 1, len);
+
+ *sideband_type = SIDEBAND_REMOTE_ERROR;
+ break;
+ case 2:
+ b = buf + 1;
+
+ /*
+ * Append a suffix to each nonempty line to clear the
+ * end of the screen line.
+ *
+ * The output is accumulated in a buffer and
+ * each line is printed to stderr using
+ * write(2) to ensure inter-process atomicity.
+ */
+ while ((brk = strpbrk(b, "\n\r"))) {
+ int linelen = brk - b;
+
+ if (!scratch->len)
+ strbuf_addstr(scratch, DISPLAY_PREFIX);
+ if (linelen > 0) {
+ maybe_colorize_sideband(scratch, b, linelen);
+ strbuf_addstr(scratch, suffix);
}
- break;
- case 1:
- write_or_die(out, buf + 1, len);
- break;
- default:
- strbuf_addf(&outbuf, "%s%s: protocol error: bad band #%d",
- outbuf.len ? "\n" : "", me, band);
- retval = SIDEBAND_PROTOCOL_ERROR;
- break;
+
+ strbuf_addch(scratch, *brk);
+ xwrite(2, scratch->buf, scratch->len);
+ strbuf_reset(scratch);
+
+ b = brk + 1;
+ }
+
+ if (*b) {
+ strbuf_addstr(scratch, scratch->len ?
+ "" : DISPLAY_PREFIX);
+ maybe_colorize_sideband(scratch, b, strlen(b));
}
+ return 0;
+ case 1:
+ *sideband_type = SIDEBAND_PRIMARY;
+ break;
+ default:
+ strbuf_addf(scratch, "%s%s: protocol error: bad band #%d",
+ scratch->len ? "\n" : "", me, band);
+ *sideband_type = SIDEBAND_PROTOCOL_ERROR;
+ break;
}
- if (outbuf.len) {
- strbuf_addch(&outbuf, '\n');
- xwrite(2, outbuf.buf, outbuf.len);
+cleanup:
+ if (scratch->len) {
+ strbuf_addch(scratch, '\n');
+ xwrite(2, scratch->buf, scratch->len);
}
- strbuf_release(&outbuf);
- return retval;
+ strbuf_release(scratch);
+ return 1;
}
/*
diff --git a/sideband.h b/sideband.h
index 7a8146f..2c4f021 100644
--- a/sideband.h
+++ b/sideband.h
@@ -1,10 +1,28 @@
#ifndef SIDEBAND_H
#define SIDEBAND_H
-#define SIDEBAND_PROTOCOL_ERROR -2
-#define SIDEBAND_REMOTE_ERROR -1
+enum sideband_type {
+ SIDEBAND_PROTOCOL_ERROR = -2,
+ SIDEBAND_REMOTE_ERROR = -1,
+ SIDEBAND_FLUSH = 0,
+ SIDEBAND_PRIMARY = 1
+};
+
+/*
+ * Inspects a multiplexed packet read from the remote. If this packet is a
+ * progress packet and thus should not be processed by the caller, returns 0.
+ * Otherwise, returns 1, releases scratch, and sets sideband_type.
+ *
+ * If this packet is SIDEBAND_PROTOCOL_ERROR, SIDEBAND_REMOTE_ERROR, or a
+ * progress packet, also prints a message to stderr.
+ *
+ * scratch must be a struct strbuf allocated by the caller. It is used to store
+ * progress messages split across multiple packets.
+ */
+int demultiplex_sideband(const char *me, char *buf, int len,
+ struct strbuf *scratch,
+ enum sideband_type *sideband_type);
-int recv_sideband(const char *me, int in_stream, int out);
void send_sideband(int fd, int band, const char *data, ssize_t sz, int packet_max);
#endif