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// ical/fs serves a directory of .ics files as a 9p file system.
//
// It does not fetch anything. A subscribed calendar is a file somebody
// else wrote -- pim/fetch(1), a svc entry, an editor -- which is why a
// local calendar and a subscribed one are the same thing here. Writing
// a file and poking ctl is the whole interface for keeping it current.
//
// It is one backend behind pim/lib/cal, which owns the tree. Files on
// disk are read-only as far as scheduling goes: there is nowhere to PUT
// and no METHOD:REQUEST to reply to, so this backend reports "read" and
// nothing above it has to guess.
package main
import (
"flag"
"fmt"
"os"
"path/filepath"
"sort"
"strings"
"sync"
"time"
"pim/lib/cal"
)
func fatal(format string, a ...interface{}) {
cal.Warnf(format, a...)
os.Exit(1)
}
// backend reads a directory of .ics files.
type backend struct {
c *Cal // nil when serving -d alone
dir string
poll time.Duration
mu sync.Mutex
evs []*cal.Event
sig string // what the directory looked like when last loaded
last time.Time
err string
}
func (b *backend) Name() string {
if b.c != nil {
return b.c.Name
}
return "calendar"
}
// A published feed can only be read. See pim/doc/design.md.
func (b *backend) Caps() string { return "read" }
// Me is whose calendar this is, from the config. It makes partstat
// readable -- you can see where you stand -- without making it
// writable, because nothing here can deliver a reply.
func (b *backend) Me() []string {
if b.c == nil {
return nil
}
return b.c.Me
}
// Refresh is how often to re-stat the directory. Whoever writes the
// files should poke ctl instead; this only catches a hand edit.
func (b *backend) Refresh() time.Duration { return b.poll }
func (b *backend) Status() (time.Time, string) {
b.mu.Lock()
defer b.mu.Unlock()
return b.last, b.err
}
func (b *backend) Describe() string {
s := fmt.Sprintf("dir %s\n", b.dir)
if b.c != nil && len(b.c.Me) > 0 {
s += "me " + joinComma(b.c.Me) + "\n"
}
return s
}
// Sync reloads if the directory has changed. Name, size and mtime are
// enough to notice: a rewrite that keeps all three identical is a
// rewrite of identical content.
func (b *backend) Sync() (bool, error) {
sig, err := dirsig(b.dir)
b.note(time.Now(), err)
if err != nil {
return false, err
}
b.mu.Lock()
same := sig == b.sig && b.evs != nil
b.mu.Unlock()
if same {
return false, nil
}
evs, err := cal.LoadDir(b.dir)
if err != nil {
return false, err
}
b.mu.Lock()
b.evs, b.sig = evs, sig
b.mu.Unlock()
return true, nil
}
// dirsig summarises every .ics in dir.
func dirsig(dir string) (string, error) {
names, err := filepath.Glob(filepath.Join(dir, "*.ics"))
if err != nil {
return "", err
}
sort.Strings(names)
var b strings.Builder
for _, n := range names {
fi, err := os.Stat(n)
if err != nil {
continue
}
fmt.Fprintf(&b, "%s:%d:%d\n", n, fi.Size(), fi.ModTime().UnixNano())
}
return b.String(), nil
}
func (b *backend) Events() ([]*cal.Event, error) {
b.mu.Lock()
evs := b.evs
b.mu.Unlock()
if evs != nil {
return evs, nil
}
evs, err := cal.LoadDir(b.dir)
if err != nil {
return nil, err
}
b.mu.Lock()
b.evs = evs
b.mu.Unlock()
return evs, nil
}
func (b *backend) note(t time.Time, err error) {
b.mu.Lock()
defer b.mu.Unlock()
b.last = t
if err != nil {
b.err = err.Error()
} else {
b.err = ""
}
}
func joinComma(a []string) string {
s := ""
for i, x := range a {
if i > 0 {
s += ","
}
s += x
}
return s
}
func main() {
cal.Argv0 = "ical/fs"
var (
dir = flag.String("d", ".", "directory of .ics files")
name = flag.String("s", "", "service name to post in /srv (default ical.$user.$pid)")
days = flag.Int("w", 400, "expansion window in days")
dry = flag.Bool("n", false, "load and report, do not serve")
conf = flag.String("c", "", "calendar config (default $home/lib/pim)")
which = flag.String("N", "", "which calendar in the config to serve")
poll = flag.Duration("r", 0, "re-stat the directory this often (0: only on ctl refresh)")
)
flag.Usage = func() {
fmt.Fprintf(os.Stderr,
"usage: ical/fs [-n] [-c config] [-N name] [-d dir] [-s srv] [-w days] [-r poll]\n")
os.Exit(2)
}
flag.Parse()
user := os.Getenv("user")
if user == "" {
user = "glenda"
}
if *name == "" {
// as rio(1) and plumb(1) name theirs, so several may run at once
*name = fmt.Sprintf("ical.%s.%d", user, os.Getpid())
}
path := *conf
if path == "" {
path = filepath.Join(os.Getenv("home"), "lib", "pim")
if _, err := os.Stat(path); err != nil {
path = "" // no config is fine: -d alone works
}
}
// One server serves one calendar; several calendars means several
// servers, each mounted at its own name under /mnt/pim/calendars.
be := &backend{dir: *dir, poll: *poll}
if *which != "" {
// a name even without a config: -o still wants to be called
// something other than "calendar" under calendars/
be.c = &Cal{Name: *which}
}
if path != "" {
cals, err := readConfig(path, *dir)
if err != nil {
fatal("%v", err)
}
if be.c, err = pick(cals, *which); err != nil {
fatal("%v", err)
}
}
s := cal.New(be, cal.Config{
User: user, Srv: *name, Conf: path,
Window: time.Duration(*days) * 24 * time.Hour,
})
if *dry {
if err := s.Report(); err != nil {
fatal("%v", err)
}
return
}
if err := s.Serve(); err != nil {
fatal("%v", err)
}
}
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