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Added debug option #16

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42 changes: 28 additions & 14 deletions snmp.go
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@ type WapSNMP struct {
timeout time.Duration // Timeout to use for all SNMP packets.
retries int // Number of times to retry an operation.
conn net.Conn // Cache the UDP connection in the object.
debug bool // Enable debugging information
}

// SNMPValue type to express an oid value pair.
Expand All @@ -37,14 +38,14 @@ func NewWapSNMP(target, community string, version SNMPVersion, timeout time.Dura
if err != nil {
return nil, fmt.Errorf(`error connecting to ("udp", "%s"): %s`, targetPort, err)
}
return &WapSNMP{target, community, version, timeout, retries, conn}, nil
return &WapSNMP{target, community, version, timeout, retries, conn, false}, nil
}

// NewWapSNMPOnConn creates a new WapSNMP object from an existing net.Conn.
//
// It does not check if the provided target is valid.
func NewWapSNMPOnConn(target, community string, version SNMPVersion, timeout time.Duration, retries int, conn net.Conn) *WapSNMP {
return &WapSNMP{target, community, version, timeout, retries, conn}
return &WapSNMP{target, community, version, timeout, retries, conn, false}
}

// RandomRequestID generates a valid SNMP request ID.
Expand All @@ -53,29 +54,37 @@ func RandomRequestID() int {
}

// poll sends a packet and wait for a response. Both operations can timeout, they're retried up to retries times.
func poll(conn net.Conn, toSend []byte, respondBuffer []byte, retries int, timeout time.Duration) (int, error) {
func poll(conn net.Conn, toSend []byte, respondBuffer []byte, retries int, timeout time.Duration, debug bool) (int, error) {
var err error
for i := 0; i < retries+1; i++ {
deadline := time.Now().Add(timeout)

if err = conn.SetWriteDeadline(deadline); err != nil {
log.Printf("Couldn't set write deadline. Retrying. Retry %d/%d\n", i, retries)
if debug {
log.Printf("Couldn't set write deadline. Retrying. Retry %d/%d\n", i, retries)
}
continue
}
if _, err = conn.Write(toSend); err != nil {
log.Printf("Couldn't write. Retrying. Retry %d/%d\n", i, retries)
if debug {
log.Printf("Couldn't write. Retrying. Retry %d/%d\n", i, retries)
}
continue
}

deadline = time.Now().Add(timeout)
if err = conn.SetReadDeadline(deadline); err != nil {
log.Printf("Couldn't set read deadline. Retrying. Retry %d/%d\n", i, retries)
if debug {
log.Printf("Couldn't set read deadline. Retrying. Retry %d/%d\n", i, retries)
}
continue
}

numRead := 0
if numRead, err = conn.Read(respondBuffer); err != nil {
log.Printf("Couldn't read. Retrying. Retry %d/%d\n", i, retries)
if debug {
log.Printf("Couldn't read. Retrying. Retry %d/%d\n", i, retries)
}
continue
}

Expand All @@ -84,6 +93,11 @@ func poll(conn net.Conn, toSend []byte, respondBuffer []byte, retries int, timeo
return 0, err
}

// Enable/Disalbe debugging
func (w *WapSNMP) Debug(debugOption bool) {
w.debug = debugOption
}

// Get sends an SNMP get request requesting the value for an oid.
func (w WapSNMP) Get(oid Oid) (interface{}, error) {
requestID := RandomRequestID()
Expand All @@ -96,7 +110,7 @@ func (w WapSNMP) Get(oid Oid) (interface{}, error) {
}

response := make([]byte, bufSize, bufSize)
numRead, err := poll(w.conn, req, response, w.retries, w.timeout)
numRead, err := poll(w.conn, req, response, w.retries, w.timeout, w.debug)
if err != nil {
return nil, err
}
Expand Down Expand Up @@ -130,7 +144,7 @@ func (w WapSNMP) GetMultiple(oids []Oid) (map[string]interface{}, error) {
}

response := make([]byte, bufSize, bufSize)
numRead, err := poll(w.conn, req, response, w.retries, w.timeout)
numRead, err := poll(w.conn, req, response, w.retries, w.timeout, w.debug)
if err != nil {
return nil, err
}
Expand Down Expand Up @@ -166,7 +180,7 @@ func (w WapSNMP) Set(oid Oid, value interface{}) (interface{}, error) {
}

response := make([]byte, bufSize, bufSize)
numRead, err := poll(w.conn, req, response, w.retries, w.timeout)
numRead, err := poll(w.conn, req, response, w.retries, w.timeout, w.debug)
if err != nil {
return nil, err
}
Expand Down Expand Up @@ -200,7 +214,7 @@ func (w WapSNMP) SetMultiple(toset map[string]interface{}) (map[string]interface
}

response := make([]byte, bufSize, bufSize)
numRead, err := poll(w.conn, req, response, w.retries, w.timeout)
numRead, err := poll(w.conn, req, response, w.retries, w.timeout, w.debug)
if err != nil {
return nil, err
}
Expand Down Expand Up @@ -236,7 +250,7 @@ func (w WapSNMP) GetNext(oid Oid) (*Oid, interface{}, error) {
}

response := make([]byte, bufSize)
numRead, err := poll(w.conn, req, response, w.retries, w.timeout)
numRead, err := poll(w.conn, req, response, w.retries, w.timeout, w.debug)
if err != nil {
return nil, nil, err
}
Expand Down Expand Up @@ -275,7 +289,7 @@ func (w WapSNMP) GetBulk(oid Oid, maxRepetitions int) (map[string]interface{}, e
}

response := make([]byte, bufSize, bufSize)
numRead, err := poll(w.conn, req, response, w.retries, w.timeout)
numRead, err := poll(w.conn, req, response, w.retries, w.timeout, w.debug)
if err != nil {
return nil, err
}
Expand Down Expand Up @@ -312,7 +326,7 @@ func (w WapSNMP) GetBulkArray(oid Oid, maxRepetitions int) ([]SNMPValue, error)
}

response := make([]byte, bufSize, bufSize)
numRead, err := poll(w.conn, req, response, w.retries, w.timeout)
numRead, err := poll(w.conn, req, response, w.retries, w.timeout, w.debug)
if err != nil {
return nil, err
}
Expand Down