Added access log to server and modified mock-fts to use it

internal/server/server.go

@@ -6,6 +6,7 @@ import (
 	"crypto/tls"
 	"errors"
 	"fmt"
+	"log"
 	"log/slog"
 	"net"
 	"net/http"
@@ -17,6 +18,7 @@ import (
 	"github.com/pires/go-proxyproto"
 
 	"git.avsdev.uk/Go/job-search/internal/config"
+	"git.avsdev.uk/Go/job-search/internal/logging"
 	"git.avsdev.uk/Go/job-search/internal/middleware"
 	"git.avsdev.uk/Go/job-search/internal/util"
 	"git.avsdev.uk/Go/job-search/internal/websocket"
@@ -49,6 +51,16 @@ func WithLogger(logger *slog.Logger) Option {
 	}
 }
 
+// WithAccessLog makes the server write a line to logger for every request, in
+// the Combined Log Format (see logging.AccessLog), as well as the request
+// lines it logs with slog. The line is written when the request ends, and
+// covers requests that middleware refuses.
+func WithAccessLog(logger *log.Logger) Option {
+	return func(s *Server) {
+		s.accessLog = logger
+	}
+}
+
 // WithMiddleware appends middleware to a group. This is the generic hook
 // (auth, metrics, tracing, custom header rules, ...).
 func WithMiddleware(group Group, middlewares ...Middleware) Option {
@@ -82,10 +94,12 @@ type limiterHook struct {
 
 // Server is the application server.
 type Server struct {
-	conf     *config.JSCServer
-	log      *slog.Logger
-	hooks    map[Group][]Middleware
-	limiters map[Group]limiterHook
+	conf *config.JSCServer
+	log  *slog.Logger
+	// accessLog is where the access log is written, or nil for none.
+	accessLog *log.Logger
+	hooks     map[Group][]Middleware
+	limiters  map[Group]limiterHook
 
 	// trusted are the proxies whose forwarding headers are believed.
 	trusted []netip.Prefix
@@ -156,6 +170,9 @@ func New(conf *config.JSCServer, opts ...Option) (*Server, error) {
 		server.backgroundCancel()
 		return nil, err
 	}
+	if server.accessLog != nil {
+		server.handler = logging.AccessLog(server.accessLog, true, server.handler)
+	}
 
 	return server, nil
 }