openresty/patches/nginx-1.17.1-intercept_error_log.patch

diff --git a/src/core/ngx_cycle.h b/src/core/ngx_cycle.h
index c51b7ff..4c335b9 100644
--- a/src/core/ngx_cycle.h
+++ b/src/core/ngx_cycle.h
@@ -22,9 +22,14 @@
 #define NGX_DEBUG_POINTS_ABORT  2
 
 
+#define HAVE_INTERCEPT_ERROR_LOG_PATCH
+
+
 typedef struct ngx_shm_zone_s  ngx_shm_zone_t;
 
 typedef ngx_int_t (*ngx_shm_zone_init_pt) (ngx_shm_zone_t *zone, void *data);
+typedef ngx_int_t (*ngx_log_intercept_pt) (ngx_log_t *log, ngx_uint_t level,
+    u_char *buf, size_t len);
 
 struct ngx_shm_zone_s {
     void                     *data;
@@ -75,6 +80,10 @@ struct ngx_cycle_s {
     ngx_str_t                 prefix;
     ngx_str_t                 lock_file;
     ngx_str_t                 hostname;
+
+    ngx_log_intercept_pt      intercept_error_log_handler;
+    void                     *intercept_error_log_data;
+    unsigned                  entered_logger;    /* :1 */
 };
 
 
diff --git a/src/core/ngx_log.c b/src/core/ngx_log.c
index 8e9408d..ed9b11b 100644
--- a/src/core/ngx_log.c
+++ b/src/core/ngx_log.c
@@ -112,6 +112,8 @@ ngx_log_error_core(ngx_uint_t level, ngx_log_t *log, ngx_err_t err,
     ngx_uint_t   wrote_stderr, debug_connection;
     u_char       errstr[NGX_MAX_ERROR_STR];
 
+    ngx_log_intercept_pt    log_intercept = NULL;
+
     last = errstr + NGX_MAX_ERROR_STR;
 
     p = ngx_cpymem(errstr, ngx_cached_err_log_time.data,
@@ -153,6 +155,16 @@ ngx_log_error_core(ngx_uint_t level, ngx_log_t *log, ngx_err_t err,
         p = last - NGX_LINEFEED_SIZE;
     }
 
+    if (ngx_cycle) {
+        log_intercept = ngx_cycle->intercept_error_log_handler;
+    }
+
+    if (log_intercept && !ngx_cycle->entered_logger) {
+        ngx_cycle->entered_logger = 1;
+        log_intercept(log, level, errstr, p - errstr);
+        ngx_cycle->entered_logger = 0;
+    }
+
     ngx_linefeed(p);
 
     wrote_stderr = 0;