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remote: Replace builtin semaphore type with common util lib

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Refactor code to use the new fancy lib!
This commit is contained in:
James Shubin
2017-02-26 20:50:05 -05:00
parent d8e19cd79a
commit 646a576358
1 changed files with 12 additions and 34 deletions
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46
remote/remote.go
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@@ -63,6 +63,7 @@ import (
cv "github.com/purpleidea/mgmt/converger"
"github.com/purpleidea/mgmt/util"
"github.com/purpleidea/mgmt/util/semaphore"
"github.com/purpleidea/mgmt/yamlgraph"
multierr "github.com/hashicorp/go-multierror"
@@ -698,16 +699,16 @@ type Remotes struct {
converger cv.Converger
convergerCb func(func(map[string]bool) error) (func(), error)
wg sync.WaitGroup // keep track of each running SSH connection
lock sync.Mutex // mutex for access to sshmap
sshmap map[string]*SSH // map to each SSH struct with the remote as the key
exiting bool // flag to let us know if we're exiting
exitChan chan struct{} // closes when we should exit
semaphore Semaphore // counting semaphore to limit concurrent connections
hostnames []string // list of hostnames we've seen so far
cuid cv.UID // convergerUID for the remote itself
cuids map[string]cv.UID // map to each SSH struct with the remote as the key
callbackCancelFunc func() // stored callback function cancel function
wg sync.WaitGroup // keep track of each running SSH connection
lock sync.Mutex // mutex for access to sshmap
sshmap map[string]*SSH // map to each SSH struct with the remote as the key
exiting bool // flag to let us know if we're exiting
exitChan chan struct{} // closes when we should exit
semaphore *semaphore.Semaphore // counting semaphore to limit concurrent connections
hostnames []string // list of hostnames we've seen so far
cuid cv.UID // convergerUID for the remote itself
cuids map[string]cv.UID // map to each SSH struct with the remote as the key
callbackCancelFunc func() // stored callback function cancel function
flags Flags // constant runtime values
}
@@ -730,7 +731,7 @@ func NewRemotes(clientURLs, remoteURLs []string, noop bool, remotes []string, fi
convergerCb: convergerCb,
sshmap: make(map[string]*SSH),
exitChan: make(chan struct{}),
semaphore: NewSemaphore(int(cConns)),
semaphore: semaphore.NewSemaphore(int(cConns)),
hostnames: make([]string, len(remotes)),
cuids: make(map[string]cv.UID),
flags: flags,
@@ -1078,29 +1079,6 @@ func cleanURL(s string) string {
return u.Host
}
// Semaphore is a counting semaphore.
type Semaphore chan struct{}
// NewSemaphore creates a new semaphore.
func NewSemaphore(size int) Semaphore {
return make(Semaphore, size)
}
// P acquires n resources.
func (s Semaphore) P(n int) {
e := struct{}{}
for i := 0; i < n; i++ {
s <- e // acquire one
}
}
// V releases n resources.
func (s Semaphore) V(n int) {
for i := 0; i < n; i++ {
<-s // release one
}
}
// combinedWriter mimics what the ssh.CombinedOutput command does.
type combinedWriter struct {
b bytes.Buffer