Added LogRoller parser and entity.

The errors and logs can now have log rolling if provided by the user.
The current customisable parameter of it are:
The maximal size of the file before rolling.
The maximal age/time of the file before rolling.
The number of backups to keep.

config/parse/dispenser.go

@@ -119,6 +119,11 @@ func (d *Dispenser) NextBlock() bool {
 	return true
 }
 
+func (d *Dispenser) IncrNest() {
+	d.nesting++
+	return
+}
+
 // Val gets the text of the current token. If there is no token
 // loaded, it returns empty string.
 func (d *Dispenser) Val() string {

config/setup/errors.go

@@ -11,7 +11,6 @@ import (
 	"github.com/hashicorp/go-syslog"
 	"github.com/mholt/caddy/middleware"
 	"github.com/mholt/caddy/middleware/errors"
-	"gopkg.in/natefinch/lumberjack.v2"
 )
 
 // Errors configures a new gzip middleware instance.
@@ -24,30 +23,35 @@ func Errors(c *Controller) (middleware.Middleware, error) {
 	// Open the log file for writing when the server starts
 	c.Startup = append(c.Startup, func() error {
 		var err error
-		var file io.Writer
+		var writer io.Writer
 
 		if handler.LogFile == "stdout" {
-			file = os.Stdout
+			writer = os.Stdout
 		} else if handler.LogFile == "stderr" {
-			file = os.Stderr
+			writer = os.Stderr
 		} else if handler.LogFile == "syslog" {
-			file, err = gsyslog.NewLogger(gsyslog.LOG_ERR, "LOCAL0", "caddy")
+			writer, err = gsyslog.NewLogger(gsyslog.LOG_ERR, "LOCAL0", "caddy")
 			if err != nil {
 				return err
 			}
 		} else if handler.LogFile != "" {
-			_, err = os.OpenFile(handler.LogFile, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0644)
+			var file *os.File
+			file, err = os.OpenFile(handler.LogFile, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0644)
 			if err != nil {
 				return err
 			}
-			file = &lumberjack.Logger{
-				Filename:   handler.LogFile,
-				MaxSize:    20,
-				MaxBackups: 10,
+			if handler.LogRoller != nil {
+				file.Close()
+
+				handler.LogRoller.Filename = handler.LogFile
+
+				writer = handler.LogRoller.GetLogWriter()
+			} else {
+				writer = file
 			}
 		}
 
-		handler.Log = log.New(file, "", 0)
+		handler.Log = log.New(writer, "", 0)
 		return nil
 	})
 
@@ -77,6 +81,16 @@ func errorsParse(c *Controller) (*errors.ErrorHandler, error) {
 
 			if what == "log" {
 				handler.LogFile = where
+				if c.NextArg() {
+					if c.Val() == "{" {
+						c.IncrNest()
+						logRoller, err := parseRoller(c)
+						if err != nil {
+							return hadBlock, err
+						}
+						handler.LogRoller = logRoller
+					}
+				}
 			} else {
 				// Error page; ensure it exists
 				where = path.Join(c.Root, where)
@@ -97,6 +111,10 @@ func errorsParse(c *Controller) (*errors.ErrorHandler, error) {
 	}
 
 	for c.Next() {
+		// weird hack to avoid having the handler values overwritten.
+		if c.Val() == "}" {
+			continue
+		}
 		// Configuration may be in a block
 		hadBlock, err := optionalBlock()
 		if err != nil {

config/setup/errors_test.go

@@ -0,0 +1,137 @@
+package setup
+
+import (
+	"testing"
+
+	"github.com/mholt/caddy/middleware"
+	"github.com/mholt/caddy/middleware/errors"
+)
+
+func TestErrors(t *testing.T) {
+
+	c := NewTestController(`errors`)
+
+	mid, err := Errors(c)
+
+	if err != nil {
+		t.Errorf("Expected no errors, got: %v", err)
+	}
+
+	if mid == nil {
+		t.Fatal("Expected middleware, was nil instead")
+	}
+
+	handler := mid(EmptyNext)
+	myHandler, ok := handler.(*errors.ErrorHandler)
+
+	if !ok {
+		t.Fatalf("Expected handler to be type ErrorHandler, got: %#v", handler)
+	}
+
+	if myHandler.LogFile != errors.DefaultLogFilename {
+		t.Errorf("Expected %s as the default LogFile", errors.DefaultLogFilename)
+	}
+	if myHandler.LogRoller != nil {
+		t.Errorf("Expected LogRoller to be nil, got: %v", *myHandler.LogRoller)
+	}
+	if !SameNext(myHandler.Next, EmptyNext) {
+		t.Error("'Next' field of handler was not set properly")
+	}
+}
+
+func TestErrorsParse(t *testing.T) {
+	tests := []struct {
+		inputErrorsRules     string
+		shouldErr            bool
+		expectedErrorHandler errors.ErrorHandler
+	}{
+		{`errors`, false, errors.ErrorHandler{
+			LogFile: errors.DefaultLogFilename,
+		}},
+		{`errors errors.txt`, false, errors.ErrorHandler{
+			LogFile: "errors.txt",
+		}},
+		{`errors { log errors.txt
+        404 404.html
+        500 500.html
+}`, false, errors.ErrorHandler{
+			LogFile: "errors.txt",
+			ErrorPages: map[int]string{
+				404: "404.html",
+				500: "500.html",
+			},
+		}},
+		{`errors { log errors.txt { size 2 age 10 keep 3 } }`, false, errors.ErrorHandler{
+			LogFile: "errors.txt",
+			LogRoller: &middleware.LogRoller{
+				MaxSize:    2,
+				MaxAge:     10,
+				MaxBackups: 3,
+			},
+		}},
+		{`errors { log errors.txt {
+            size 3
+            age 11
+            keep 5
+        }
+        404 404.html
+        503 503.html
+}`, false, errors.ErrorHandler{
+			LogFile: "errors.txt",
+			ErrorPages: map[int]string{
+				404: "404.html",
+				503: "503.html",
+			},
+			LogRoller: &middleware.LogRoller{
+				MaxSize:    3,
+				MaxAge:     11,
+				MaxBackups: 5,
+			},
+		}},
+	}
+	for i, test := range tests {
+		c := NewTestController(test.inputErrorsRules)
+		actualErrorsRule, err := errorsParse(c)
+
+		if err == nil && test.shouldErr {
+			t.Errorf("Test %d didn't error, but it should have", i)
+		} else if err != nil && !test.shouldErr {
+			t.Errorf("Test %d errored, but it shouldn't have; got '%v'", i, err)
+		}
+		if actualErrorsRule.LogFile != test.expectedErrorHandler.LogFile {
+			t.Errorf("Test %d expected LogFile to be  %s  , but got %s",
+				i, test.expectedErrorHandler.LogFile, actualErrorsRule.LogFile)
+		}
+		if actualErrorsRule.LogRoller != nil && test.expectedErrorHandler.LogRoller == nil || actualErrorsRule.LogRoller == nil && test.expectedErrorHandler.LogRoller != nil {
+			t.Fatalf("Test %d expected LogRoller to be %v, but got %v",
+				i, test.expectedErrorHandler.LogRoller, actualErrorsRule.LogRoller)
+		}
+		if len(actualErrorsRule.ErrorPages) != len(test.expectedErrorHandler.ErrorPages) {
+			t.Fatalf("Test %d expected %d no of Error pages, but got %d ",
+				i, len(test.expectedErrorHandler.ErrorPages), len(actualErrorsRule.ErrorPages))
+		}
+		if actualErrorsRule.LogRoller != nil && test.expectedErrorHandler.LogRoller != nil {
+			if actualErrorsRule.LogRoller.Filename != test.expectedErrorHandler.LogRoller.Filename {
+				t.Fatalf("Test %d expected LogRoller Filename to be %s, but got %s",
+					i, test.expectedErrorHandler.LogRoller.Filename, actualErrorsRule.LogRoller.Filename)
+			}
+			if actualErrorsRule.LogRoller.MaxAge != test.expectedErrorHandler.LogRoller.MaxAge {
+				t.Fatalf("Test %d expected LogRoller MaxAge to be %d, but got %d",
+					i, test.expectedErrorHandler.LogRoller.MaxAge, actualErrorsRule.LogRoller.MaxAge)
+			}
+			if actualErrorsRule.LogRoller.MaxBackups != test.expectedErrorHandler.LogRoller.MaxBackups {
+				t.Fatalf("Test %d expected LogRoller MaxBackups to be %d, but got %d",
+					i, test.expectedErrorHandler.LogRoller.MaxBackups, actualErrorsRule.LogRoller.MaxBackups)
+			}
+			if actualErrorsRule.LogRoller.MaxSize != test.expectedErrorHandler.LogRoller.MaxSize {
+				t.Fatalf("Test %d expected LogRoller MaxSize to be %d, but got %d",
+					i, test.expectedErrorHandler.LogRoller.MaxSize, actualErrorsRule.LogRoller.MaxSize)
+			}
+			if actualErrorsRule.LogRoller.LocalTime != test.expectedErrorHandler.LogRoller.LocalTime {
+				t.Fatalf("Test %d expected LogRoller LocalTime to be %t, but got %t",
+					i, test.expectedErrorHandler.LogRoller.LocalTime, actualErrorsRule.LogRoller.LocalTime)
+			}
+		}
+	}
+
+}

config/setup/log.go

@@ -9,7 +9,6 @@ import (
 	"github.com/mholt/caddy/middleware"
 	caddylog "github.com/mholt/caddy/middleware/log"
 	"github.com/mholt/caddy/server"
-	"gopkg.in/natefinch/lumberjack.v2"
 )
 
 // Log sets up the logging middleware.
@@ -23,30 +22,33 @@ func Log(c *Controller) (middleware.Middleware, error) {
 	c.Startup = append(c.Startup, func() error {
 		for i := 0; i < len(rules); i++ {
 			var err error
-			var file io.Writer
+			var writer io.Writer
 
 			if rules[i].OutputFile == "stdout" {
-				file = os.Stdout
+				writer = os.Stdout
 			} else if rules[i].OutputFile == "stderr" {
-				file = os.Stderr
+				writer = os.Stderr
 			} else if rules[i].OutputFile == "syslog" {
-				file, err = gsyslog.NewLogger(gsyslog.LOG_INFO, "LOCAL0", "caddy")
+				writer, err = gsyslog.NewLogger(gsyslog.LOG_INFO, "LOCAL0", "caddy")
 				if err != nil {
 					return err
 				}
 			} else {
-				_, err = os.OpenFile(rules[i].OutputFile, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0644)
+				var file *os.File
+				file, err = os.OpenFile(rules[i].OutputFile, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0644)
 				if err != nil {
 					return err
 				}
-				file = &lumberjack.Logger{
-					Filename:   rules[i].OutputFile,
-					MaxSize:    20,
-					MaxBackups: 10,
+				if rules[i].Roller != nil {
+					file.Close()
+					rules[i].Roller.Filename = rules[i].OutputFile
+					writer = rules[i].Roller.GetLogWriter()
+				} else {
+					writer = file
 				}
 			}
 
-			rules[i].Log = log.New(file, "", 0)
+			rules[i].Log = log.New(writer, "", 0)
 		}
 
 		return nil
@@ -63,12 +65,33 @@ func logParse(c *Controller) ([]caddylog.Rule, error) {
 	for c.Next() {
 		args := c.RemainingArgs()
 
+		var logRoller *middleware.LogRoller
+		if c.NextBlock() {
+			if c.Val() == "rotate" {
+				if c.NextArg() {
+					if c.Val() == "{" {
+						var err error
+						logRoller, err = parseRoller(c)
+						if err != nil {
+							return nil, err
+						}
+						// This part doesn't allow having something after the rotate block
+						if c.Next() {
+							if c.Val() != "}" {
+								return nil, c.ArgErr()
+							}
+						}
+					}
+				}
+			}
+		}
 		if len(args) == 0 {
 			// Nothing specified; use defaults
 			rules = append(rules, caddylog.Rule{
 				PathScope:  "/",
 				OutputFile: caddylog.DefaultLogFilename,
 				Format:     caddylog.DefaultLogFormat,
+				Roller:     logRoller,
 			})
 		} else if len(args) == 1 {
 			// Only an output file specified
@@ -76,6 +99,7 @@ func logParse(c *Controller) ([]caddylog.Rule, error) {
 				PathScope:  "/",
 				OutputFile: args[0],
 				Format:     caddylog.DefaultLogFormat,
+				Roller:     logRoller,
 			})
 		} else {
 			// Path scope, output file, and maybe a format specified
@@ -97,6 +121,7 @@ func logParse(c *Controller) ([]caddylog.Rule, error) {
 				PathScope:  args[0],
 				OutputFile: args[1],
 				Format:     format,
+				Roller:     logRoller,
 			})
 		}
 	}

config/setup/log_test.go

@@ -3,6 +3,7 @@ package setup
 import (
 	"testing"
 
+	"github.com/mholt/caddy/middleware"
 	caddylog "github.com/mholt/caddy/middleware/log"
 )
 
@@ -36,6 +37,9 @@ func TestLog(t *testing.T) {
 	if myHandler.Rules[0].Format != caddylog.DefaultLogFormat {
 		t.Errorf("Expected %s as the default Log Format", caddylog.DefaultLogFormat)
 	}
+	if myHandler.Rules[0].Roller != nil {
+		t.Errorf("Expected Roller to be nil, got: %v", *myHandler.Rules[0].Roller)
+	}
 	if !SameNext(myHandler.Next, EmptyNext) {
 		t.Error("'Next' field of handler was not set properly")
 	}
@@ -78,7 +82,7 @@ func TestLogParse(t *testing.T) {
 			OutputFile: "accesslog.txt",
 			Format:     caddylog.CombinedLogFormat,
 		}}},
-		{`log /api1 log.txt 
+		{`log /api1 log.txt
 		  log /api2 accesslog.txt {combined}`, false, []caddylog.Rule{{
 			PathScope:  "/api1",
 			OutputFile: "log.txt",
@@ -98,6 +102,16 @@ func TestLogParse(t *testing.T) {
 			OutputFile: "log.txt",
 			Format:     "{when}",
 		}}},
+		{`log access.log { rotate { size 2 age 10 keep 3 } }`, false, []caddylog.Rule{{
+			PathScope:  "/",
+			OutputFile: "access.log",
+			Format:     caddylog.DefaultLogFormat,
+			Roller: &middleware.LogRoller{
+				MaxSize:    2,
+				MaxAge:     10,
+				MaxBackups: 3,
+			},
+		}}},
 	}
 	for i, test := range tests {
 		c := NewTestController(test.inputLogRules)
@@ -128,6 +142,32 @@ func TestLogParse(t *testing.T) {
 				t.Errorf("Test %d expected %dth LogRule Format to be  %s  , but got %s",
 					i, j, test.expectedLogRules[j].Format, actualLogRule.Format)
 			}
+			if actualLogRule.Roller != nil && test.expectedLogRules[j].Roller == nil || actualLogRule.Roller == nil && test.expectedLogRules[j].Roller != nil {
+				t.Fatalf("Test %d expected %dth LogRule Roller to be %v, but got %v",
+					i, j, test.expectedLogRules[j].Roller, actualLogRule.Roller)
+			}
+			if actualLogRule.Roller != nil && test.expectedLogRules[j].Roller != nil {
+				if actualLogRule.Roller.Filename != test.expectedLogRules[j].Roller.Filename {
+					t.Fatalf("Test %d expected %dth LogRule Roller Filename to be %s, but got %s",
+						i, j, test.expectedLogRules[j].Roller.Filename, actualLogRule.Roller.Filename)
+				}
+				if actualLogRule.Roller.MaxAge != test.expectedLogRules[j].Roller.MaxAge {
+					t.Fatalf("Test %d expected %dth LogRule Roller MaxAge to be %d, but got %d",
+						i, j, test.expectedLogRules[j].Roller.MaxAge, actualLogRule.Roller.MaxAge)
+				}
+				if actualLogRule.Roller.MaxBackups != test.expectedLogRules[j].Roller.MaxBackups {
+					t.Fatalf("Test %d expected %dth LogRule Roller MaxBackups to be %d, but got %d",
+						i, j, test.expectedLogRules[j].Roller.MaxBackups, actualLogRule.Roller.MaxBackups)
+				}
+				if actualLogRule.Roller.MaxSize != test.expectedLogRules[j].Roller.MaxSize {
+					t.Fatalf("Test %d expected %dth LogRule Roller MaxSize to be %d, but got %d",
+						i, j, test.expectedLogRules[j].Roller.MaxSize, actualLogRule.Roller.MaxSize)
+				}
+				if actualLogRule.Roller.LocalTime != test.expectedLogRules[j].Roller.LocalTime {
+					t.Fatalf("Test %d expected %dth LogRule Roller LocalTime to be %t, but got %t",
+						i, j, test.expectedLogRules[j].Roller.LocalTime, actualLogRule.Roller.LocalTime)
+				}
+			}
 		}
 	}
 

config/setup/roller.go

@@ -0,0 +1,39 @@
+package setup
+
+import (
+	"strconv"
+
+	"github.com/mholt/caddy/middleware"
+)
+
+func parseRoller(c *Controller) (*middleware.LogRoller, error) {
+	var size, age, keep int
+	// This is kind of a hack to support nested blocks:
+	// As we are already in a block: either log or errors,
+	// c.nesting > 0 but, as soon as c meets a }, it thinks
+	// the block is over and return false for c.NextBlock.
+	for c.NextBlock() {
+		what := c.Val()
+		if !c.NextArg() {
+			return nil, c.ArgErr()
+		}
+		value := c.Val()
+		var err error
+		switch what {
+		case "size":
+			size, err = strconv.Atoi(value)
+		case "age":
+			age, err = strconv.Atoi(value)
+		case "keep":
+			keep, err = strconv.Atoi(value)
+		}
+		if err != nil {
+			return nil, err
+		}
+	}
+	return &middleware.LogRoller{
+		MaxSize:    size,
+		MaxAge:     age,
+		MaxBackups: keep,
+	}, nil
+}

middleware/errors/errors.go

@@ -20,6 +20,7 @@ type ErrorHandler struct {
 	ErrorPages map[int]string // map of status code to filename
 	LogFile    string
 	Log        *log.Logger
+	LogRoller  *middleware.LogRoller
 }
 
 func (h ErrorHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {

middleware/log/log.go

@@ -47,6 +47,7 @@ type Rule struct {
 	OutputFile string
 	Format     string
 	Log        *log.Logger
+	Roller     *middleware.LogRoller
 }
 
 const (

middleware/roller.go

@@ -0,0 +1,25 @@
+package middleware
+
+import (
+	"io"
+
+	"gopkg.in/natefinch/lumberjack.v2"
+)
+
+type LogRoller struct {
+	Filename   string
+	MaxSize    int
+	MaxAge     int
+	MaxBackups int
+	LocalTime  bool
+}
+
+func (l LogRoller) GetLogWriter() io.Writer {
+	return &lumberjack.Logger{
+		Filename:   l.Filename,
+		MaxSize:    l.MaxSize,
+		MaxAge:     l.MaxAge,
+		MaxBackups: l.MaxBackups,
+		LocalTime:  l.LocalTime,
+	}
+}