Add -k option which specifies the number of log entries to keep. Along with

-s, this allows varnishlog to be used to extract part of a log file, or
partition a log file into smaller sections.


git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@2575 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishlog/varnishlog.1

@@ -28,7 +28,7 @@
 .\"
 .\" $Id$
 .\"
-.Dd March 8, 2008
+.Dd March 9, 2008
 .Dt VARNISHLOG 1
 .Os
 .Sh NAME
@@ -44,6 +44,7 @@
 .Op Fl d
 .Op Fl I Ar regex
 .Op Fl i Ar tag
+.Op Fl k Ar keep
 .Op Fl n Ar varnish_name
 .Op Fl o
 .Op Fl P Ar file
@@ -108,6 +109,10 @@ If neither
 nor
 .Fl i
 is specified, all log entries are included.
+.It Fl k Ar num
+Only show the first
+.Nm num
+log records.
 .It Fl n
 Specifies the name of the
 .Nm varnishd

include/varnishapi.h

@@ -44,8 +44,8 @@ int base64_decode(char *d, unsigned dlen, const char *s);
 typedef int vsl_handler(void *priv, enum shmlogtag tag, unsigned fd, unsigned len, unsigned spec, const char *ptr);
 #define VSL_S_CLIENT	(1 << 0)
 #define VSL_S_BACKEND	(1 << 1)
-#define VSL_ARGS	"bCcdI:i:r:s:X:x:"
-#define VSL_USAGE	"[-bCcd] [-i tag] [-I regexp] [-r file] [-s skip] [-X regexp] [-x tag]"
+#define VSL_ARGS	"bCcdI:i:k:r:s:X:x:"
+#define VSL_USAGE	"[-bCcd] [-i tag] [-I regexp] [-k keep] [-r file] [-s skip] [-X regexp] [-x tag]"
 vsl_handler VSL_H_Print;
 struct VSL_data;
 struct VSL_data *VSL_New(void);

lib/libvarnishapi/shmlog.c

@@ -87,6 +87,7 @@ struct VSL_data {
 	regex_t			*regexcl;
 
 	unsigned long		skip;
+	unsigned long		keep;
 };
 
 #ifndef MAP_HASSEMAPHORE
@@ -297,6 +298,9 @@ VSL_NextLog(struct VSL_data *vd, unsigned char **pp)
 		if (vd->skip) {
 			--vd->skip;
 			continue;
+		} else if (vd->keep) {
+			if (--vd->keep == 0)
+				return (0);
 		}
 		if (vd->map[p[SHMLOG_TAG]] & M_SELECT) {
 			*pp = p;
@@ -501,6 +505,25 @@ vsl_s_arg(struct VSL_data *vd, const char *opt)
 	}
 	return (1);
 }
+/*--------------------------------------------------------------------*/
+
+static int
+vsl_k_arg(struct VSL_data *vd, const char *opt)
+{
+	char *end;
+
+	CHECK_OBJ_NOTNULL(vd, VSL_MAGIC);
+	if (*opt == '\0') {
+		fprintf(stderr, "number required for -k\n");
+		return (-1);
+	}
+	vd->keep = strtoul(opt, &end, 10);
+	if (*end != '\0') {
+		fprintf(stderr, "invalid number for -k\n");
+		return (-1);
+	}
+	return (1);
+}
 
 /*--------------------------------------------------------------------*/
 
@@ -518,6 +541,7 @@ VSL_Arg(struct VSL_data *vd, int arg, const char *opt)
 	case 'I': case 'X': return (vsl_IX_arg(vd, opt, arg));
 	case 'C': vd->regflags = REG_ICASE; return (1);
 	case 's': return (vsl_s_arg(vd, opt));
+	case 'k': return (vsl_k_arg(vd, opt));
 	default:
 		return (0);
 	}