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ngx_http_upstream_log_module.c
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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
* Copyright (C) Hanada
*/
#include "ngx_http_upstream_log_module.h"
#if (NGX_ZLIB)
#include <zlib.h>
#endif
/*
* Types defined in this file was completely copy from ngx_http_log_module,
* if them changes in the future, please update codes here.
*/
typedef struct ngx_http_log_op_s ngx_http_log_op_t;
typedef u_char *(*ngx_http_log_op_run_pt) (ngx_http_request_t *r, u_char *buf,
ngx_http_log_op_t *op);
typedef size_t (*ngx_http_log_op_getlen_pt) (ngx_http_request_t *r,
uintptr_t data);
struct ngx_http_log_op_s {
size_t len;
ngx_http_log_op_getlen_pt getlen;
ngx_http_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_http_log_op_t */
} ngx_http_log_fmt_t;
typedef struct {
ngx_array_t formats; /* array of ngx_http_log_fmt_t */
ngx_uint_t combined_used; /* unsigned combined_used:1 */
} ngx_http_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_http_log_buf_t;
typedef struct {
ngx_array_t *lengths;
ngx_array_t *values;
} ngx_http_log_script_t;
typedef struct {
ngx_open_file_t *file;
ngx_http_log_script_t *script;
time_t disk_full_time;
time_t error_log_time;
ngx_syslog_peer_t *syslog_peer;
ngx_http_log_fmt_t *format;
ngx_http_complex_value_t *filter;
#if (NGX_HTTP_EXT)
ngx_uint_t negative;
#endif
} ngx_http_log_t;
typedef struct {
ngx_array_t *logs; /* array of ngx_http_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_flag_t escape_non_ascii;
ngx_uint_t off; /* unsigned off:1 */
} ngx_http_log_loc_conf_t;
/* Only this struct is defined by this module */
typedef struct {
ngx_array_t *logs; /* array of ngx_http_log_t */
ngx_uint_t off; /* unsigned off:1 */
} ngx_http_upstream_log_loc_conf_t;
extern ngx_module_t ngx_http_log_module;
static void ngx_http_upstream_log_write(ngx_http_request_t *r, ngx_http_log_t *log,
u_char *buf, size_t len);
static ssize_t ngx_http_upstream_log_script_write(ngx_http_request_t *r,
ngx_http_log_script_t *script, u_char **name, u_char *buf, size_t len);
#if (NGX_ZLIB)
static ssize_t ngx_http_upstream_log_gzip(ngx_fd_t fd, u_char *buf, size_t len,
ngx_int_t level, ngx_log_t *log);
static void *ngx_http_upstream_log_gzip_alloc(void *opaque, u_int items, u_int size);
static void ngx_http_upstream_log_gzip_free(void *opaque, void *address);
#endif
static void ngx_http_upstream_log_flush(ngx_open_file_t *file, ngx_log_t *log);
static void ngx_http_upstream_log_flush_handler(ngx_event_t *ev);
static void *ngx_http_upstream_log_create_loc_conf(ngx_conf_t *cf);
static char *ngx_http_upstream_log_merge_loc_conf(ngx_conf_t *cf, void *parent,
void *child);
static char *ngx_http_upstream_log_set_log(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static ngx_command_t ngx_http_upstream_log_commands[] = {
{ ngx_string("upstream_log"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
|NGX_HTTP_LMT_CONF|NGX_CONF_1MORE,
ngx_http_upstream_log_set_log,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_http_upstream_log_module_ctx = {
NULL, /* preconfiguration */
NULL, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_upstream_log_create_loc_conf, /* create location configuration */
ngx_http_upstream_log_merge_loc_conf /* merge location configuration */
};
ngx_module_t ngx_http_upstream_log_module = {
NGX_MODULE_V1,
&ngx_http_upstream_log_module_ctx, /* module context */
ngx_http_upstream_log_commands, /* module directives */
NGX_HTTP_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
};
ngx_int_t ngx_http_upstream_log_handler(ngx_http_request_t *r) {
u_char *line, *p;
size_t len, size;
ssize_t n;
ngx_str_t val;
ngx_uint_t i, l;
ngx_http_log_t *log;
ngx_http_log_op_t *op;
ngx_http_log_buf_t *buffer;
ngx_http_upstream_log_loc_conf_t *ulcf;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http upstream log handler");
ulcf = ngx_http_get_module_loc_conf(r, ngx_http_upstream_log_module);
if (ulcf->off || !ulcf->logs) {
return NGX_OK;
}
log = ulcf->logs->elts;
for (l = 0; l < ulcf->logs->nelts; l++) {
if (log[l].filter) {
if (ngx_http_complex_value(r, log[l].filter, &val) != NGX_OK) {
return NGX_ERROR;
}
if (val.len == 0 || (val.len == 1 && val.data[0] == '0')) {
#if (NGX_HTTP_EXT)
if (!log[l].negative) {
continue;
}
} else {
if (log[l].negative) {
continue;
}
#else
continue;
#endif
}
}
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_http_script_flush_no_cacheable_variables(r, 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(r, 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_http_upstream_log_write(r, &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(r, 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(r->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(r, 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, r->connection->log, 0,
"send() to syslog failed");
} else if ((size_t) n != size) {
ngx_log_error(NGX_LOG_WARN, r->connection->log, 0,
"send() to syslog has written only %z of %uz",
n, size);
}
continue;
}
ngx_linefeed(p);
ngx_http_upstream_log_write(r, &log[l], line, p - line);
}
return NGX_OK;
}
static void
ngx_http_upstream_log_write(ngx_http_request_t *r, ngx_http_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_http_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_http_upstream_log_gzip(log->file->fd, buf, len, buffer->gzip,
r->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_http_upstream_log_script_write(r, 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, r->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, r->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_http_upstream_log_script_write(ngx_http_request_t *r, ngx_http_log_script_t *script,
u_char **name, u_char *buf, size_t len)
{
size_t root;
ssize_t n;
ngx_str_t log, path;
ngx_open_file_info_t of;
ngx_http_log_loc_conf_t *llcf;
ngx_http_core_loc_conf_t *clcf;
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
if (!r->root_tested) {
/* test root directory existence */
if (ngx_http_map_uri_to_path(r, &path, &root, 0) == NULL) {
/* simulate successful logging */
return len;
}
path.data[root] = '\0';
ngx_memzero(&of, sizeof(ngx_open_file_info_t));
of.valid = clcf->open_file_cache_valid;
of.min_uses = clcf->open_file_cache_min_uses;
of.test_dir = 1;
of.test_only = 1;
of.errors = clcf->open_file_cache_errors;
of.events = clcf->open_file_cache_events;
if (ngx_http_set_disable_symlinks(r, clcf, &path, &of) != NGX_OK) {
/* simulate successful logging */
return len;
}
if (ngx_open_cached_file(clcf->open_file_cache, &path, &of, r->pool)
!= NGX_OK)
{
if (of.err == 0) {
/* simulate successful logging */
return len;
}
ngx_log_error(NGX_LOG_ERR, r->connection->log, of.err,
"testing \"%s\" existence failed", path.data);
/* simulate successful logging */
return len;
}
if (!of.is_dir) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, NGX_ENOTDIR,
"testing \"%s\" existence failed", path.data);
/* simulate successful logging */
return len;
}
}
if (ngx_http_script_run(r, &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_HTTP, r->connection->log, 0,
"http upstream log \"%s\"", log.data);
llcf = ngx_http_get_module_loc_conf(r, ngx_http_log_module);
ngx_memzero(&of, sizeof(ngx_open_file_info_t));
of.log = 1;
of.valid = llcf->open_file_cache_valid;
of.min_uses = llcf->open_file_cache_min_uses;
of.directio = NGX_OPEN_FILE_DIRECTIO_OFF;
if (ngx_http_set_disable_symlinks(r, clcf, &log, &of) != NGX_OK) {
/* simulate successful logging */
return len;
}
if (ngx_open_cached_file(llcf->open_file_cache, &log, &of, r->pool)
!= NGX_OK)
{
if (of.err == 0) {
/* simulate successful logging */
return len;
}
ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
"%s \"%s\" failed", of.failed, log.data);
/* simulate successful logging */
return len;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http upstream log #%d", of.fd);
n = ngx_write_fd(of.fd, buf, len);
return n;
}
#if (NGX_ZLIB)
static ssize_t
ngx_http_upstream_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_http_upstream_log_gzip_alloc;
zstream.zfree = ngx_http_upstream_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_HTTP, 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_HTTP, 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_http_upstream_log_gzip_alloc(void *opaque, u_int items, u_int size)
{
ngx_pool_t *pool = opaque;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pool->log, 0,
"gzip alloc: n:%ud s:%ud", items, size);
return ngx_palloc(pool, items * size);
}
static void
ngx_http_upstream_log_gzip_free(void *opaque, void *address)
{
#if 0
ngx_pool_t *pool = opaque;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pool->log, 0, "gzip free: %p", address);
#endif
}
#endif
static void
ngx_http_upstream_log_flush(ngx_open_file_t *file, ngx_log_t *log)
{
size_t len;
ssize_t n;
ngx_http_log_buf_t *buffer;
buffer = file->data;
len = buffer->pos - buffer->start;
if (len == 0) {
return;
}
#if (NGX_ZLIB)
if (buffer->gzip) {
n = ngx_http_upstream_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_http_upstream_log_flush_handler(ngx_event_t *ev)
{
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, 0,
"http upstream log buffer flush handler");
ngx_http_upstream_log_flush(ev->data, ev->log);
}
static void *
ngx_http_upstream_log_create_loc_conf(ngx_conf_t *cf)
{
ngx_http_upstream_log_loc_conf_t *conf;
conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_log_loc_conf_t));
if (conf == NULL) {
return NULL;
}
return conf;
}
static char *
ngx_http_upstream_log_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
{
ngx_http_upstream_log_loc_conf_t *prev = parent;
ngx_http_upstream_log_loc_conf_t *conf = child;
if (conf->logs || conf->off) {
return NGX_CONF_OK;
}
conf->logs = prev->logs;
conf->off = prev->off;
return NGX_CONF_OK;
}
static char *
ngx_http_upstream_log_set_log(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_upstream_log_loc_conf_t *ulcf = conf;
ssize_t size;
ngx_int_t gzip;
ngx_uint_t i, n;
ngx_msec_t flush;
ngx_str_t *value, name, s;
ngx_http_log_t *log;
ngx_syslog_peer_t *peer;
ngx_http_log_buf_t *buffer;
ngx_http_log_fmt_t *fmt;
ngx_http_log_main_conf_t *lmcf;
ngx_http_script_compile_t sc;
ngx_http_compile_complex_value_t ccv;
value = cf->args->elts;
if (ngx_strcmp(value[1].data, "off") == 0) {
ulcf->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 (ulcf->logs == NULL) {
ulcf->logs = ngx_array_create(cf->pool, 2, sizeof(ngx_http_log_t));
if (ulcf->logs == NULL) {
return NGX_CONF_ERROR;
}
}
log = ngx_array_push(ulcf->logs);
if (log == NULL) {
return NGX_CONF_ERROR;
}
ngx_memzero(log, sizeof(ngx_http_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_http_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;
}
} else {
if (ngx_conf_full_name(cf->cycle, &value[1], 0) != NGX_OK) {
return NGX_CONF_ERROR;
}
log->script = ngx_pcalloc(cf->pool, sizeof(ngx_http_log_script_t));
if (log->script == NULL) {
return NGX_CONF_ERROR;
}
ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));
sc.cf = cf;
sc.source = &value[1];
sc.lengths = &log->script->lengths;
sc.values = &log->script->values;
sc.variables = n;
sc.complete_lengths = 1;
sc.complete_values = 1;
if (ngx_http_script_compile(&sc) != NGX_OK) {
return NGX_CONF_ERROR;
}
}
process_formats:
if (cf->args->nelts >= 3) {
name = value[2];
if (ngx_strcmp(name.data, "combined") == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"upstream log can't use format \"%V\"", &name);
}
} else {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"upstream log format is required but not set");
}
lmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_log_module);
fmt = lmcf->formats.elts;
for (i = 0; i < lmcf->formats.nelts; i++) {
if (fmt[i].name.len == name.len
&& ngx_strcasecmp(fmt[i].name.data, name.data) == 0)
{
log->format = &fmt[i];
break;
}
}
if (log->format == NULL) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"unknown log format \"%V\"", &name);
return NGX_CONF_ERROR;
}
size = 0;
flush = 0;
gzip = 0;
for (i = 3; i < cf->args->nelts; i++) {
if (ngx_strncmp(value[i].data, "buffer=", 7) == 0) {
s.len = value[i].len - 7;
s.data = value[i].data + 7;
size = ngx_parse_size(&s);
if (size == NGX_ERROR || size == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid buffer size \"%V\"", &s);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp(value[i].data, "flush=", 6) == 0) {
s.len = value[i].len - 6;
s.data = value[i].data + 6;
flush = ngx_parse_time(&s, 0);
if (flush == (ngx_msec_t) NGX_ERROR || flush == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid flush time \"%V\"", &s);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp(value[i].data, "gzip", 4) == 0
&& (value[i].len == 4 || value[i].data[4] == '='))
{
#if (NGX_ZLIB)
if (size == 0) {
size = 64 * 1024;
}
if (value[i].len == 4) {
gzip = Z_BEST_SPEED;
continue;
}
s.len = value[i].len - 5;
s.data = value[i].data + 5;
gzip = ngx_atoi(s.data, s.len);
if (gzip < 1 || gzip > 9) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid compression level \"%V\"", &s);
return NGX_CONF_ERROR;
}
continue;
#else
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"nginx was built without zlib support");
return NGX_CONF_ERROR;
#endif
}
#if (NGX_HTTP_EXT)
if (ngx_strncmp(value[i].data, "if=", 3) == 0
|| ngx_strncmp(value[i].data, "if!=", 4) == 0)
{
if (ngx_strncmp(value[i].data, "if=", 3) == 0) {
s.len = value[i].len - 3;
s.data = value[i].data + 3;
} else {
s.len = value[i].len - 4;
s.data = value[i].data + 4;
log->negative = 1;
}
#else
if (ngx_strncmp(value[i].data, "if=", 3) == 0) {
s.len = value[i].len - 3;
s.data = value[i].data + 3;
#endif
ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
ccv.cf = cf;
ccv.value = &s;
ccv.complex_value = ngx_palloc(cf->pool,
sizeof(ngx_http_complex_value_t));
if (ccv.complex_value == NULL) {
return NGX_CONF_ERROR;
}
if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
return NGX_CONF_ERROR;
}
log->filter = ccv.complex_value;
continue;
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid parameter \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
if (flush && size == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"no buffer is defined for access_log \"%V\"",
&value[1]);
return NGX_CONF_ERROR;
}
if (size) {
if (log->script) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"buffered logs cannot have variables in name");
return NGX_CONF_ERROR;
}
if (log->syslog_peer) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"logs to syslog cannot be buffered");
return NGX_CONF_ERROR;
}
if (log->file->data) {
buffer = log->file->data;
if (buffer->last - buffer->start != size
|| buffer->flush != flush
|| buffer->gzip != gzip)
{
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"access_log \"%V\" already defined "