details: http://hg.nginx.org/nginx/rev/0125b151c9a5
branches:
changeset: 6678:0125b151c9a5
user: Vladimir Homutov <vl@nginx.com>
date: Mon Sep 05 17:50:16 2016 +0300
description:
Stream: log module.

diffstat:

auto/modules | 2 +
src/stream/ngx_stream.h | 1 +
src/stream/ngx_stream_handler.c | 8 +
src/stream/ngx_stream_log_module.c | 1474 ++++++++++++++++++++++++++++++++++++
src/stream/ngx_stream_script.c | 67 +
src/stream/ngx_stream_script.h | 4 +
6 files changed, 1556 insertions(+), 0 deletions(-)

diffs (truncated from 1622 to 1000 lines):

diff -r c02290241cbe -r 0125b151c9a5 auto/modules
--- a/auto/modules Fri Sep 02 18:27:12 2016 +0300
+++ b/auto/modules Mon Sep 05 17:50:16 2016 +0300
@@ -971,6 +971,7 @@ if [ $STREAM != NO ]; then

ngx_module_name="ngx_stream_module \
ngx_stream_core_module \
+ ngx_stream_log_module \
ngx_stream_proxy_module \
ngx_stream_upstream_module"
ngx_module_incs="src/stream"
@@ -984,6 +985,7 @@ if [ $STREAM != NO ]; then
src/stream/ngx_stream_script.c \
src/stream/ngx_stream_handler.c \
src/stream/ngx_stream_core_module.c \
+ src/stream/ngx_stream_log_module.c \
src/stream/ngx_stream_proxy_module.c \
src/stream/ngx_stream_upstream.c \
src/stream/ngx_stream_upstream_round_robin.c"
diff -r c02290241cbe -r 0125b151c9a5 src/stream/ngx_stream.h
--- a/src/stream/ngx_stream.h Fri Sep 02 18:27:12 2016 +0300
+++ b/src/stream/ngx_stream.h Mon Sep 05 17:50:16 2016 +0300
@@ -121,6 +121,7 @@ typedef struct {

ngx_stream_access_pt limit_conn_handler;
ngx_stream_access_pt access_handler;
+ ngx_stream_access_pt access_log_handler;

ngx_hash_t variables_hash;

diff -r c02290241cbe -r 0125b151c9a5 src/stream/ngx_stream_handler.c
--- a/src/stream/ngx_stream_handler.c Fri Sep 02 18:27:12 2016 +0300
+++ b/src/stream/ngx_stream_handler.c Mon Sep 05 17:50:16 2016 +0300
@@ -311,11 +311,19 @@ ngx_stream_ssl_handshake_handler(ngx_con
void
ngx_stream_finalize_session(ngx_stream_session_t *s, ngx_uint_t rc)
{
+ ngx_stream_core_main_conf_t *cmcf;
+
ngx_log_debug1(NGX_LOG_DEBUG_STREAM, s->connection->log, 0,
"finalize stream session: %i", rc);

s->status = rc;

+ cmcf = ngx_stream_get_module_main_conf(s, ngx_stream_core_module);
+
+ if (cmcf->access_log_handler) {
+ (void) cmcf->access_log_handler(s);
+ }
+
ngx_stream_close_connection(s->connection);
}

diff -r c02290241cbe -r 0125b151c9a5 src/stream/ngx_stream_log_module.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/stream/ngx_stream_log_module.c Mon Sep 05 17:50:16 2016 +0300
@@ -0,0 +1,1474 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ * Copyright (C) Nginx, Inc.
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_stream.h>
+
+#if (NGX_ZLIB)
+#include <zlib.h>
+#endif
+
+
+typedef struct ngx_stream_log_op_s ngx_stream_log_op_t;
+
+typedef u_char *(*ngx_stream_log_op_run_pt) (ngx_stream_session_t *s,
+ u_char *buf, ngx_stream_log_op_t *op);
+
+typedef size_t (*ngx_stream_log_op_getlen_pt) (ngx_stream_session_t *s,
+ uintptr_t data);
+
+
+struct ngx_stream_log_op_s {
+ size_t len;
+ ngx_stream_log_op_getlen_pt getlen;
+ ngx_stream_log_op_run_pt run;
+ uintptr_t data;
+};
+
+
+typedef struct {
+ ngx_str_t name;
+ ngx_array_t *flushes;
+ ngx_array_t *ops; /* array of ngx_stream_log_op_t */
+} ngx_stream_log_fmt_t;
+
+
+typedef struct {
+ ngx_array_t formats; /* array of ngx_stream_log_fmt_t */
+} ngx_stream_log_main_conf_t;
+
+
+typedef struct {
+ u_char *start;
+ u_char *pos;
+ u_char *last;
+
+ ngx_event_t *event;
+ ngx_msec_t flush;
+ ngx_int_t gzip;
+} ngx_stream_log_buf_t;
+
+
+typedef struct {
+ ngx_array_t *lengths;
+ ngx_array_t *values;
+} ngx_stream_log_script_t;
+
+
+typedef struct {
+ ngx_open_file_t *file;
+ ngx_stream_log_script_t *script;
+ time_t disk_full_time;
+ time_t error_log_time;
+ ngx_syslog_peer_t *syslog_peer;
+ ngx_stream_log_fmt_t *format;
+ ngx_stream_complex_value_t *filter;
+} ngx_stream_log_t;
+
+
+typedef struct {
+ ngx_array_t *logs; /* array of ngx_stream_log_t */
+
+ ngx_open_file_cache_t *open_file_cache;
+ time_t open_file_cache_valid;
+ ngx_uint_t open_file_cache_min_uses;
+
+ ngx_uint_t off; /* unsigned off:1 */
+} ngx_stream_log_srv_conf_t;
+
+
+typedef struct {
+ ngx_str_t name;
+ size_t len;
+ ngx_stream_log_op_run_pt run;
+} ngx_stream_log_var_t;
+
+
+static void ngx_stream_log_write(ngx_stream_session_t *s, ngx_stream_log_t *log,
+ u_char *buf, size_t len);
+static ssize_t ngx_stream_log_script_write(ngx_stream_session_t *s,
+ ngx_stream_log_script_t *script, u_char **name, u_char *buf, size_t len);
+
+#if (NGX_ZLIB)
+static ssize_t ngx_stream_log_gzip(ngx_fd_t fd, u_char *buf, size_t len,
+ ngx_int_t level, ngx_log_t *log);
+
+static void *ngx_stream_log_gzip_alloc(void *opaque, u_int items, u_int size);
+static void ngx_stream_log_gzip_free(void *opaque, void *address);
+#endif
+
+static void ngx_stream_log_flush(ngx_open_file_t *file, ngx_log_t *log);
+static void ngx_stream_log_flush_handler(ngx_event_t *ev);
+
+static ngx_int_t ngx_stream_log_variable_compile(ngx_conf_t *cf,
+ ngx_stream_log_op_t *op, ngx_str_t *value);
+static size_t ngx_stream_log_variable_getlen(ngx_stream_session_t *s,
+ uintptr_t data);
+static u_char *ngx_stream_log_variable(ngx_stream_session_t *s, u_char *buf,
+ ngx_stream_log_op_t *op);
+static uintptr_t ngx_stream_log_escape(u_char *dst, u_char *src, size_t size);
+
+
+static void *ngx_stream_log_create_main_conf(ngx_conf_t *cf);
+static void *ngx_stream_log_create_srv_conf(ngx_conf_t *cf);
+static char *ngx_stream_log_merge_srv_conf(ngx_conf_t *cf, void *parent,
+ void *child);
+static char *ngx_stream_log_set_log(ngx_conf_t *cf, ngx_command_t *cmd,
+ void *conf);
+static char *ngx_stream_log_set_format(ngx_conf_t *cf, ngx_command_t *cmd,
+ void *conf);
+static char *ngx_stream_log_compile_format(ngx_conf_t *cf,
+ ngx_array_t *flushes, ngx_array_t *ops, ngx_array_t *args, ngx_uint_t s);
+static char *ngx_stream_log_open_file_cache(ngx_conf_t *cf, ngx_command_t *cmd,
+ void *conf);
+static ngx_int_t ngx_stream_log_init(ngx_conf_t *cf);
+
+
+static ngx_command_t ngx_stream_log_commands[] = {
+
+ { ngx_string("log_format"),
+ NGX_STREAM_MAIN_CONF|NGX_CONF_2MORE,
+ ngx_stream_log_set_format,
+ NGX_STREAM_MAIN_CONF_OFFSET,
+ 0,
+ NULL },
+
+ { ngx_string("access_log"),
+ NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_1MORE,
+ ngx_stream_log_set_log,
+ NGX_STREAM_SRV_CONF_OFFSET,
+ 0,
+ NULL },
+
+ { ngx_string("open_log_file_cache"),
+ NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1234,
+ ngx_stream_log_open_file_cache,
+ NGX_STREAM_SRV_CONF_OFFSET,
+ 0,
+ NULL },
+
+ ngx_null_command
+};
+
+
+static ngx_stream_module_t ngx_stream_log_module_ctx = {
+ NULL, /* preconfiguration */
+ ngx_stream_log_init, /* postconfiguration */
+
+ ngx_stream_log_create_main_conf, /* create main configuration */
+ NULL, /* init main configuration */
+
+ ngx_stream_log_create_srv_conf, /* create server configuration */
+ ngx_stream_log_merge_srv_conf /* merge server configuration */
+};
+
+
+ngx_module_t ngx_stream_log_module = {
+ NGX_MODULE_V1,
+ &ngx_stream_log_module_ctx, /* module context */
+ ngx_stream_log_commands, /* module directives */
+ NGX_STREAM_MODULE, /* module type */
+ NULL, /* init master */
+ NULL, /* init module */
+ NULL, /* init process */
+ NULL, /* init thread */
+ NULL, /* exit thread */
+ NULL, /* exit process */
+ NULL, /* exit master */
+ NGX_MODULE_V1_PADDING
+};
+
+
+static ngx_int_t
+ngx_stream_log_handler(ngx_stream_session_t *s)
+{
+ u_char *line, *p;
+ size_t len, size;
+ ssize_t n;
+ ngx_str_t val;
+ ngx_uint_t i, l;
+ ngx_stream_log_t *log;
+ ngx_stream_log_op_t *op;
+ ngx_stream_log_buf_t *buffer;
+ ngx_stream_log_srv_conf_t *lscf;
+
+ ngx_log_debug0(NGX_LOG_DEBUG_STREAM, s->connection->log, 0,
+ "stream log handler");
+
+ lscf = ngx_stream_get_module_srv_conf(s, ngx_stream_log_module);
+
+ if (lscf->off || lscf->logs == NULL) {
+ return NGX_OK;
+ }
+
+ log = lscf->logs->elts;
+ for (l = 0; l < lscf->logs->nelts; l++) {
+
+ if (log[l].filter) {
+ if (ngx_stream_complex_value(s, log[l].filter, &val) != NGX_OK) {
+ return NGX_ERROR;
+ }
+
+ if (val.len == 0 || (val.len == 1 && val.data[0] == '0')) {
+ continue;
+ }
+ }
+
+ if (ngx_time() == log[l].disk_full_time) {
+
+ /*
+ * on FreeBSD writing to a full filesystem with enabled softupdates
+ * may block process for much longer time than writing to non-full
+ * filesystem, so we skip writing to a log for one second
+ */
+
+ continue;
+ }
+
+ ngx_stream_script_flush_no_cacheable_variables(s,
+ log[l].format->flushes);
+
+ len = 0;
+ op = log[l].format->ops->elts;
+ for (i = 0; i < log[l].format->ops->nelts; i++) {
+ if (op[i].len == 0) {
+ len += op[i].getlen(s, op[i].data);
+
+ } else {
+ len += op[i].len;
+ }
+ }
+
+ if (log[l].syslog_peer) {
+
+ /* length of syslog's PRI and HEADER message parts */
+ len += sizeof("<255>Jan 01 00:00:00 ") - 1
+ + ngx_cycle->hostname.len + 1
+ + log[l].syslog_peer->tag.len + 2;
+
+ goto alloc_line;
+ }
+
+ len += NGX_LINEFEED_SIZE;
+
+ buffer = log[l].file ? log[l].file->data : NULL;
+
+ if (buffer) {
+
+ if (len > (size_t) (buffer->last - buffer->pos)) {
+
+ ngx_stream_log_write(s, &log[l], buffer->start,
+ buffer->pos - buffer->start);
+
+ buffer->pos = buffer->start;
+ }
+
+ if (len <= (size_t) (buffer->last - buffer->pos)) {
+
+ p = buffer->pos;
+
+ if (buffer->event && p == buffer->start) {
+ ngx_add_timer(buffer->event, buffer->flush);
+ }
+
+ for (i = 0; i < log[l].format->ops->nelts; i++) {
+ p = op[i].run(s, p, &op[i]);
+ }
+
+ ngx_linefeed(p);
+
+ buffer->pos = p;
+
+ continue;
+ }
+
+ if (buffer->event && buffer->event->timer_set) {
+ ngx_del_timer(buffer->event);
+ }
+ }
+
+ alloc_line:
+
+ line = ngx_pnalloc(s->connection->pool, len);
+ if (line == NULL) {
+ return NGX_ERROR;
+ }
+
+ p = line;
+
+ if (log[l].syslog_peer) {
+ p = ngx_syslog_add_header(log[l].syslog_peer, line);
+ }
+
+ for (i = 0; i < log[l].format->ops->nelts; i++) {
+ p = op[i].run(s, p, &op[i]);
+ }
+
+ if (log[l].syslog_peer) {
+
+ size = p - line;
+
+ n = ngx_syslog_send(log[l].syslog_peer, line, size);
+
+ if (n < 0) {
+ ngx_log_error(NGX_LOG_WARN, s->connection->log, 0,
+ "send() to syslog failed");
+
+ } else if ((size_t) n != size) {
+ ngx_log_error(NGX_LOG_WARN, s->connection->log, 0,
+ "send() to syslog has written only %z of %uz",
+ n, size);
+ }
+
+ continue;
+ }
+
+ ngx_linefeed(p);
+
+ ngx_stream_log_write(s, &log[l], line, p - line);
+ }
+
+ return NGX_OK;
+}
+
+
+static void
+ngx_stream_log_write(ngx_stream_session_t *s, ngx_stream_log_t *log,
+ u_char *buf, size_t len)
+{
+ u_char *name;
+ time_t now;
+ ssize_t n;
+ ngx_err_t err;
+#if (NGX_ZLIB)
+ ngx_stream_log_buf_t *buffer;
+#endif
+
+ if (log->script == NULL) {
+ name = log->file->name.data;
+
+#if (NGX_ZLIB)
+ buffer = log->file->data;
+
+ if (buffer && buffer->gzip) {
+ n = ngx_stream_log_gzip(log->file->fd, buf, len, buffer->gzip,
+ s->connection->log);
+ } else {
+ n = ngx_write_fd(log->file->fd, buf, len);
+ }
+#else
+ n = ngx_write_fd(log->file->fd, buf, len);
+#endif
+
+ } else {
+ name = NULL;
+ n = ngx_stream_log_script_write(s, log->script, &name, buf, len);
+ }
+
+ if (n == (ssize_t) len) {
+ return;
+ }
+
+ now = ngx_time();
+
+ if (n == -1) {
+ err = ngx_errno;
+
+ if (err == NGX_ENOSPC) {
+ log->disk_full_time = now;
+ }
+
+ if (now - log->error_log_time > 59) {
+ ngx_log_error(NGX_LOG_ALERT, s->connection->log, err,
+ ngx_write_fd_n " to \"%s\" failed", name);
+
+ log->error_log_time = now;
+ }
+
+ return;
+ }
+
+ if (now - log->error_log_time > 59) {
+ ngx_log_error(NGX_LOG_ALERT, s->connection->log, 0,
+ ngx_write_fd_n " to \"%s\" was incomplete: %z of %uz",
+ name, n, len);
+
+ log->error_log_time = now;
+ }
+}
+
+
+static ssize_t
+ngx_stream_log_script_write(ngx_stream_session_t *s,
+ ngx_stream_log_script_t *script, u_char **name, u_char *buf, size_t len)
+{
+ ssize_t n;
+ ngx_str_t log;
+ ngx_open_file_info_t of;
+ ngx_stream_log_srv_conf_t *lscf;
+
+ if (ngx_stream_script_run(s, &log, script->lengths->elts, 1,
+ script->values->elts)
+ == NULL)
+ {
+ /* simulate successful logging */
+ return len;
+ }
+
+ log.data[log.len - 1] = '\0';
+ *name = log.data;
+
+ ngx_log_debug1(NGX_LOG_DEBUG_STREAM, s->connection->log, 0,
+ "stream log \"%s\"", log.data);
+
+ lscf = ngx_stream_get_module_srv_conf(s, ngx_stream_log_module);
+
+ ngx_memzero(&of, sizeof(ngx_open_file_info_t));
+
+ of.log = 1;
+ of.valid = lscf->open_file_cache_valid;
+ of.min_uses = lscf->open_file_cache_min_uses;
+ of.directio = NGX_OPEN_FILE_DIRECTIO_OFF;
+
+ if (ngx_open_cached_file(lscf->open_file_cache, &log, &of,
+ s->connection->pool)
+ != NGX_OK)
+ {
+ ngx_log_error(NGX_LOG_CRIT, s->connection->log, ngx_errno,
+ "%s \"%s\" failed", of.failed, log.data);
+ /* simulate successful logging */
+ return len;
+ }
+
+ ngx_log_debug1(NGX_LOG_DEBUG_STREAM, s->connection->log, 0,
+ "stream log #%d", of.fd);
+
+ n = ngx_write_fd(of.fd, buf, len);
+
+ return n;
+}
+
+
+#if (NGX_ZLIB)
+
+static ssize_t
+ngx_stream_log_gzip(ngx_fd_t fd, u_char *buf, size_t len, ngx_int_t level,
+ ngx_log_t *log)
+{
+ int rc, wbits, memlevel;
+ u_char *out;
+ size_t size;
+ ssize_t n;
+ z_stream zstream;
+ ngx_err_t err;
+ ngx_pool_t *pool;
+
+ wbits = MAX_WBITS;
+ memlevel = MAX_MEM_LEVEL - 1;
+
+ while ((ssize_t) len < ((1 << (wbits - 1)) - 262)) {
+ wbits--;
+ memlevel--;
+ }
+
+ /*
+ * This is a formula from deflateBound() for conservative upper bound of
+ * compressed data plus 18 bytes of gzip wrapper.
+ */
+
+ size = len + ((len + 7) >> 3) + ((len + 63) >> 6) + 5 + 18;
+
+ ngx_memzero(&zstream, sizeof(z_stream));
+
+ pool = ngx_create_pool(256, log);
+ if (pool == NULL) {
+ /* simulate successful logging */
+ return len;
+ }
+
+ pool->log = log;
+
+ zstream.zalloc = ngx_stream_log_gzip_alloc;
+ zstream.zfree = ngx_stream_log_gzip_free;
+ zstream.opaque = pool;
+
+ out = ngx_pnalloc(pool, size);
+ if (out == NULL) {
+ goto done;
+ }
+
+ zstream.next_in = buf;
+ zstream.avail_in = len;
+ zstream.next_out = out;
+ zstream.avail_out = size;
+
+ rc = deflateInit2(&zstream, (int) level, Z_DEFLATED, wbits + 16, memlevel,
+ Z_DEFAULT_STRATEGY);
+
+ if (rc != Z_OK) {
+ ngx_log_error(NGX_LOG_ALERT, log, 0, "deflateInit2() failed: %d", rc);
+ goto done;
+ }
+
+ ngx_log_debug4(NGX_LOG_DEBUG_STREAM, log, 0,
+ "deflate in: ni:%p no:%p ai:%ud ao:%ud",
+ zstream.next_in, zstream.next_out,
+ zstream.avail_in, zstream.avail_out);
+
+ rc = deflate(&zstream, Z_FINISH);
+
+ if (rc != Z_STREAM_END) {
+ ngx_log_error(NGX_LOG_ALERT, log, 0,
+ "deflate(Z_FINISH) failed: %d", rc);
+ goto done;
+ }
+
+ ngx_log_debug5(NGX_LOG_DEBUG_STREAM, log, 0,
+ "deflate out: ni:%p no:%p ai:%ud ao:%ud rc:%d",
+ zstream.next_in, zstream.next_out,
+ zstream.avail_in, zstream.avail_out,
+ rc);
+
+ size -= zstream.avail_out;
+
+ rc = deflateEnd(&zstream);
+
+ if (rc != Z_OK) {
+ ngx_log_error(NGX_LOG_ALERT, log, 0, "deflateEnd() failed: %d", rc);
+ goto done;
+ }
+
+ n = ngx_write_fd(fd, out, size);
+
+ if (n != (ssize_t) size) {
+ err = (n == -1) ? ngx_errno : 0;
+
+ ngx_destroy_pool(pool);
+
+ ngx_set_errno(err);
+ return -1;
+ }
+
+done:
+
+ ngx_destroy_pool(pool);
+
+ /* simulate successful logging */
+ return len;
+}
+
+
+static void *
+ngx_stream_log_gzip_alloc(void *opaque, u_int items, u_int size)
+{
+ ngx_pool_t *pool = opaque;
+
+ ngx_log_debug2(NGX_LOG_DEBUG_STREAM, pool->log, 0,
+ "gzip alloc: n:%ud s:%ud", items, size);
+
+ return ngx_palloc(pool, items * size);
+}
+
+
+static void
+ngx_stream_log_gzip_free(void *opaque, void *address)
+{
+#if 0
+ ngx_pool_t *pool = opaque;
+
+ ngx_log_debug1(NGX_LOG_DEBUG_STREAM, pool->log, 0,
+ "gzip free: %p", address);
+#endif
+}
+
+#endif
+
+
+static void
+ngx_stream_log_flush(ngx_open_file_t *file, ngx_log_t *log)
+{
+ size_t len;
+ ssize_t n;
+ ngx_stream_log_buf_t *buffer;
+
+ buffer = file->data;
+
+ len = buffer->pos - buffer->start;
+
+ if (len == 0) {
+ return;
+ }
+
+#if (NGX_ZLIB)
+ if (buffer->gzip) {
+ n = ngx_stream_log_gzip(file->fd, buffer->start, len, buffer->gzip,
+ log);
+ } else {
+ n = ngx_write_fd(file->fd, buffer->start, len);
+ }
+#else
+ n = ngx_write_fd(file->fd, buffer->start, len);
+#endif
+
+ if (n == -1) {
+ ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
+ ngx_write_fd_n " to \"%s\" failed",
+ file->name.data);
+
+ } else if ((size_t) n != len) {
+ ngx_log_error(NGX_LOG_ALERT, log, 0,
+ ngx_write_fd_n " to \"%s\" was incomplete: %z of %uz",
+ file->name.data, n, len);
+ }
+
+ buffer->pos = buffer->start;
+
+ if (buffer->event && buffer->event->timer_set) {
+ ngx_del_timer(buffer->event);
+ }
+}
+
+
+static void
+ngx_stream_log_flush_handler(ngx_event_t *ev)
+{
+ ngx_open_file_t *file;
+ ngx_stream_log_buf_t *buffer;
+
+ ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, 0,
+ "stream log buffer flush handler");
+
+ if (ev->timedout) {
+ ngx_stream_log_flush(ev->data, ev->log);
+ return;
+ }
+
+ /* cancel the flush timer for graceful shutdown */
+
+ file = ev->data;
+ buffer = file->data;
+
+ buffer->event = NULL;
+}
+
+
+static u_char *
+ngx_stream_log_copy_short(ngx_stream_session_t *s, u_char *buf,
+ ngx_stream_log_op_t *op)
+{
+ size_t len;
+ uintptr_t data;
+
+ len = op->len;
+ data = op->data;
+
+ while (len--) {
+ *buf++ = (u_char) (data & 0xff);
+ data >>= 8;
+ }
+
+ return buf;
+}
+
+
+static u_char *
+ngx_stream_log_copy_long(ngx_stream_session_t *s, u_char *buf,
+ ngx_stream_log_op_t *op)
+{
+ return ngx_cpymem(buf, (u_char *) op->data, op->len);
+}
+
+
+static ngx_int_t
+ngx_stream_log_variable_compile(ngx_conf_t *cf, ngx_stream_log_op_t *op,
+ ngx_str_t *value)
+{
+ ngx_int_t index;
+
+ index = ngx_stream_get_variable_index(cf, value);
+ if (index == NGX_ERROR) {
+ return NGX_ERROR;
+ }
+
+ op->len = 0;
+ op->getlen = ngx_stream_log_variable_getlen;
+ op->run = ngx_stream_log_variable;
+ op->data = index;
+
+ return NGX_OK;
+}
+
+
+static size_t
+ngx_stream_log_variable_getlen(ngx_stream_session_t *s, uintptr_t data)
+{
+ uintptr_t len;
+ ngx_stream_variable_value_t *value;
+
+ value = ngx_stream_get_indexed_variable(s, data);
+
+ if (value == NULL || value->not_found) {
+ return 1;
+ }
+
+ len = ngx_stream_log_escape(NULL, value->data, value->len);
+
+ value->escape = len ? 1 : 0;
+
+ return value->len + len * 3;
+}
+
+
+static u_char *
+ngx_stream_log_variable(ngx_stream_session_t *s, u_char *buf,
+ ngx_stream_log_op_t *op)
+{
+ ngx_stream_variable_value_t *value;
+
+ value = ngx_stream_get_indexed_variable(s, op->data);
+
+ if (value == NULL || value->not_found) {
+ *buf = '-';
+ return buf + 1;
+ }
+
+ if (value->escape == 0) {
+ return ngx_cpymem(buf, value->data, value->len);
+
+ } else {
+ return (u_char *) ngx_stream_log_escape(buf, value->data, value->len);
+ }
+}
+
+
+static uintptr_t
+ngx_stream_log_escape(u_char *dst, u_char *src, size_t size)
+{
+ ngx_uint_t n;
+ static u_char hex[] = "0123456789ABCDEF";
+
+ static uint32_t escape[] = {
+ 0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
+
+ /* ?>=< ;:98 7654 3210 /.-, +*)( '&%$ #"! */
+ 0x00000004, /* 0000 0000 0000 0000 0000 0000 0000 0100 */
+
+ /* _^]\ [ZYX WVUT SRQP ONML KJIH GFED CBA@ */
+ 0x10000000, /* 0001 0000 0000 0000 0000 0000 0000 0000 */
+
+ /* ~}| {zyx wvut srqp onml kjih gfed cba` */
+ 0x80000000, /* 1000 0000 0000 0000 0000 0000 0000 0000 */
+
+ 0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
+ 0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
+ 0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
+ 0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
+ };
+
+
+ if (dst == NULL) {
+
+ /* find the number of the characters to be escaped */
+
+ n = 0;
+
+ while (size) {
+ if (escape[*src >> 5] & (1U << (*src & 0x1f))) {
+ n++;
+ }
+ src++;
+ size--;
+ }
+
+ return (uintptr_t) n;
+ }
+
+ while (size) {
+ if (escape[*src >> 5] & (1U << (*src & 0x1f))) {
+ *dst++ = '\\';
+ *dst++ = 'x';
+ *dst++ = hex[*src >> 4];
+ *dst++ = hex[*src & 0xf];
+ src++;
+
+ } else {
+ *dst++ = *src++;
+ }
+ size--;
+ }
+
+ return (uintptr_t) dst;
+}
+
+
+static void *
+ngx_stream_log_create_main_conf(ngx_conf_t *cf)
+{
+ ngx_stream_log_main_conf_t *conf;
+
+ conf = ngx_pcalloc(cf->pool, sizeof(ngx_stream_log_main_conf_t));
+ if (conf == NULL) {
+ return NULL;
+ }
+
+ if (ngx_array_init(&conf->formats, cf->pool, 4,
+ sizeof(ngx_stream_log_fmt_t))
+ != NGX_OK)
+ {
+ return NULL;
+ }
+
+ return conf;
+}
+
+
+static void *
+ngx_stream_log_create_srv_conf(ngx_conf_t *cf)
+{
+ ngx_stream_log_srv_conf_t *conf;
+
+ conf = ngx_pcalloc(cf->pool, sizeof(ngx_stream_log_srv_conf_t));
+ if (conf == NULL) {
+ return NULL;
+ }
+
+ conf->open_file_cache = NGX_CONF_UNSET_PTR;
+
+ return conf;
+}
+
+
+static char *
+ngx_stream_log_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
+{
+ ngx_stream_log_srv_conf_t *prev = parent;
+ ngx_stream_log_srv_conf_t *conf = child;
+
+ if (conf->open_file_cache == NGX_CONF_UNSET_PTR) {
+
+ conf->open_file_cache = prev->open_file_cache;
+ conf->open_file_cache_valid = prev->open_file_cache_valid;
+ conf->open_file_cache_min_uses = prev->open_file_cache_min_uses;
+
+ if (conf->open_file_cache == NGX_CONF_UNSET_PTR) {
+ conf->open_file_cache = NULL;
+ }
+ }
+
+ if (conf->logs || conf->off) {
+ return NGX_CONF_OK;
+ }
+
+ conf->logs = prev->logs;
+ conf->off = prev->off;
+
+ return NGX_CONF_OK;
+}
+
+
+static char *
+ngx_stream_log_set_log(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
+{
+ ngx_stream_log_srv_conf_t *lscf = conf;
+
+ ssize_t size;
+ ngx_int_t gzip;
+ ngx_uint_t i, n;
+ ngx_msec_t flush;
+ ngx_str_t *value, name, s;
+ ngx_stream_log_t *log;
+ ngx_syslog_peer_t *peer;
+ ngx_stream_log_buf_t *buffer;
+ ngx_stream_log_fmt_t *fmt;
+ ngx_stream_script_compile_t sc;
+ ngx_stream_log_main_conf_t *lmcf;
+ ngx_stream_compile_complex_value_t ccv;
+
+ value = cf->args->elts;
+
+ if (ngx_strcmp(value[1].data, "off") == 0) {
+ lscf->off = 1;
+ if (cf->args->nelts == 2) {
+ return NGX_CONF_OK;
+ }
+
+ ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+ "invalid parameter \"%V\"", &value[2]);
+ return NGX_CONF_ERROR;
+ }
+
+ if (lscf->logs == NULL) {
+ lscf->logs = ngx_array_create(cf->pool, 2, sizeof(ngx_stream_log_t));
+ if (lscf->logs == NULL) {
+ return NGX_CONF_ERROR;
+ }
+ }
+
+ lmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_log_module);
+
+ log = ngx_array_push(lscf->logs);
+ if (log == NULL) {
+ return NGX_CONF_ERROR;
+ }
+
+ ngx_memzero(log, sizeof(ngx_stream_log_t));
+
+
+ if (ngx_strncmp(value[1].data, "syslog:", 7) == 0) {
+
+ peer = ngx_pcalloc(cf->pool, sizeof(ngx_syslog_peer_t));
+ if (peer == NULL) {
+ return NGX_CONF_ERROR;
+ }
+
+ if (ngx_syslog_process_conf(cf, peer) != NGX_CONF_OK) {
+ return NGX_CONF_ERROR;
+ }
+
+ log->syslog_peer = peer;
+
+ goto process_formats;
+ }
+
+ n = ngx_stream_script_variables_count(&value[1]);
+
+ if (n == 0) {
+ log->file = ngx_conf_open_file(cf->cycle, &value[1]);
+ if (log->file == NULL) {
+ return NGX_CONF_ERROR;

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