126 lines
2.4 KiB
Go
126 lines
2.4 KiB
Go
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package fs
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import (
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"fmt"
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"os"
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"strings"
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"time"
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)
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type Flag string
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func cat(f []Flag) string {
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var list []string
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for _, el := range f {
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list = append(list, string(el))
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}
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return strings.Join(list, "")
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}
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const (
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Seen Flag = "S"
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Answered = "R"
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Flagged = "F"
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Deleted = "T"
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Draft = "D"
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)
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// MailFile holds the information needed to format the name of the file
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// containing a single email. The format is:
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// `<%d_%d.%d.%s>,U=<%d>,FMD5=<%s>:2,<FLAGS>`
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// (logical groups being enclosed by angle brackets) where:
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// - `<%d_%d.%d.%s>` is the concatenation of:
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// * system unix timestamp of arrival time of the message
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// * a progressive number to distinguish messages arrived at once
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// * pid of the current process
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// * hostname of the local machine
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// - `,U=<%d>` holds the UID of the message as decided by the server
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// - `,FMD5=<%s>:2` holds the md5sum of the name of the current mailbox
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// - `,<FLAGS>` carries the flags active on the message
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type MailFile struct {
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timestamp time.Time
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progressive int
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pid int
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hostname string
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uid int
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md5 string
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flags []Flag
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}
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func (m *MailFile) SetUid(uid int) {
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m.uid = uid
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}
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func (m *MailFile) SetMd5(md5 string) {
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m.md5 = md5
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}
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func (m *MailFile) SetFlags(flags []Flag) {
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m.flags = flags
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}
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func (m *MailFile) String() string {
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return fmt.Sprintf(
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"%d_%d.%d.%s,U=%d,FMD5=%s:2,%s",
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m.timestamp.Unix(),
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m.progressive,
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m.pid,
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m.hostname,
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m.uid,
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m.md5,
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cat(m.flags),
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)
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}
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type MailFileRequest struct {
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respCh chan MailFile
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}
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func NewMailFileRequest() MailFileRequest {
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ch := make(chan MailFile)
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return MailFileRequest{respCh: ch}
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}
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func (r MailFileRequest) Response() MailFile {
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return <-r.respCh
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}
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func NewOracle() chan MailFileRequest {
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r := realClock{}
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return newOracle(r)
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}
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func newOracle(c clock) chan MailFileRequest {
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reqCh := make(chan MailFileRequest, 10)
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go spawnOracle(reqCh, c)
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return reqCh
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}
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func spawnOracle(reqCh <-chan MailFileRequest, c clock) {
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count := 0
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C := c.Ticker().getC()
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pid := os.Getpid()
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hostname, err := os.Hostname()
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if err != nil {
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hostname = "MISSING"
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}
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for {
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select {
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case <-C:
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count = 0
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case req := <-reqCh:
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req.respCh <- MailFile{
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timestamp: c.Now(),
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progressive: count,
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pid: pid,
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hostname: hostname,
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}
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count += 1
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}
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}
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}
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type MailDir struct {
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basePath string
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}
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