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caddy/server/server.go

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package server
import (
"errors"
"log"
"net/http"
"github.com/mholt/caddy/config"
"github.com/mholt/caddy/middleware"
)
// The default configuration file to load if none is specified
const DefaultConfigFile = "Caddyfile"
// servers maintains a registry of running servers, keyed by address.
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var servers = make(map[string]*Server)
// Server represents an instance of a server, which serves
// static content at a particular address (host and port).
type Server struct {
config config.Config
reqlog *log.Logger
errlog *log.Logger
fileServer http.Handler
stack http.HandlerFunc
}
// New creates a new Server and registers it with the list
// of servers created. Each server must have a unique host:port
// combination. This function does not start serving.
func New(conf config.Config) (*Server, error) {
addr := conf.Address()
// Unique address check
if _, exists := servers[addr]; exists {
return nil, errors.New("Address " + addr + " is already in use")
}
// Initialize
s := new(Server)
s.config = conf
// Register the server
servers[addr] = s
return s, nil
}
// Serve starts the server. It blocks until the server quits.
func (s *Server) Serve() error {
err := s.buildStack()
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if err != nil {
return err
}
if s.config.TLS.Enabled {
return http.ListenAndServeTLS(s.config.Address(), s.config.TLS.Certificate, s.config.TLS.Key, s)
} else {
return http.ListenAndServe(s.config.Address(), s)
}
}
// ServeHTTP is the entry point for each request to s.
func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
s.stack(w, r)
}
// Log writes a message to the server's configured error log,
// if there is one, or if there isn't, to the default stderr log.
func (s *Server) Log(v ...interface{}) {
if s.errlog != nil {
s.errlog.Println(v)
} else {
log.Println(v)
}
}
// buildStack builds the server's middleware stack based
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// on its config. This method should be called last before
// ListenAndServe begins.
func (s *Server) buildStack() error {
s.fileServer = http.FileServer(http.Dir(s.config.Root))
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for _, start := range s.config.Startup {
err := start()
if err != nil {
return err
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}
}
s.compile(s.config.Middleware)
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return nil
}
// compile is an elegant alternative to nesting middleware generator
// function calls like handler1(handler2(handler3(finalHandler))).
func (s *Server) compile(layers []middleware.Middleware) {
s.stack = s.fileServer.ServeHTTP // core app layer
for _, layer := range layers {
s.stack = layer(s.stack)
}
}