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|
package server
import (
"regexp"
"sync"
)
func init() {
newCmd(envGet, "env", "get")
newCmd(envSet, "env", "set")
newCmd(envDel, "env", "del")
newCmd(envShow, "env", "show")
}
type env struct {
m map[string]string
sync.Mutex
}
var isValidVarName = regexp.MustCompile("^[a-zA-Z][a-zA-Z0-9]*$").MatchString
func (e *env) get(key string) (string, bool) {
e.Lock()
defer e.Unlock()
v, ok := e.m[key]
return v, ok
}
func (e *env) set(key string, value string) {
e.Lock()
defer e.Unlock()
if e.m == nil {
e.m = make(map[string]string)
}
e.m[key] = value
}
func (e *env) del(key string) bool {
e.Lock()
defer e.Unlock()
if e.m == nil {
return false
}
if _, ok := e.m[key]; !ok {
return false
}
delete(e.m, key)
return true
}
func (e *env) each(f func (string, string) bool) {
e.Lock()
defer e.Unlock()
for k, v := range e.m {
if !f(k, v) {
break
}
}
}
func envGet(r *request) {
r.expect(1)
if v, ok := r.c.s.env.get(r.args[0]); ok {
r.Print(v)
} else {
r.Fatal("no such variable")
}
}
func envSet(r *request) {
r.expect(2)
if !isValidVarName(r.args[0]) {
r.Fatal("bad variable name")
}
r.c.s.env.set(r.args[0], r.args[1])
}
func envDel(r *request) {
r.expect(1)
if !r.c.s.env.del(r.args[0]) {
r.Fatal("no such variable")
}
}
func envShow(r *request) {
r.expect(0)
r.c.s.env.each(func (k string, v string) bool {
r.Println(k, v)
return true
})
}
|
