/*
Given a thing (field value in a struct), set the thing with the element in the map (key)
the map value to the proper type.
*/
func set_value(thing reflect.Value, kind reflect.Kind, key string, tag_id string, pfx string, annon bool, m map[string]string) {
if !thing.CanAddr() { // prevent stack dump
return
}
switch kind {
default:
fmt.Fprintf(os.Stderr, "transform.mts: tagged sturct member cannot be converted from map: tag=%s kind=%v\n", key, thing.Kind())
case reflect.String:
thing.SetString(m[key])
case reflect.Ptr:
p := thing.Elem() // get the pointer value; allows us to suss the type
if !p.IsValid() { // ptr is nill in the struct so we must allocate a pointer to 0 so it can be changed below
thing.Set(reflect.New(thing.Type().Elem()))
p = thing.Elem()
}
switch p.Kind() {
case reflect.String:
s := m[key] // copy it and then point to the copy
thing.Set(reflect.ValueOf(&s))
case reflect.Int:
i := clike.Atoi(m[key]) // convert to integer and then point at the value
thing.Set(reflect.ValueOf(&i))
case reflect.Int64:
i := clike.Atoi64(m[key])
thing.Set(reflect.ValueOf(&i))
case reflect.Int32:
i := clike.Atoi32(m[key])
thing.Set(reflect.ValueOf(&i))
case reflect.Int16:
i := clike.Atoi16(m[key])
thing.Set(reflect.ValueOf(&i))
case reflect.Int8:
i := int8(clike.Atoi16(m[key]))
thing.Set(reflect.ValueOf(&i))
case reflect.Uint:
ui := clike.Atou(m[key])
thing.Set(reflect.ValueOf(&ui))
case reflect.Uint64:
ui := clike.Atou64(m[key])
thing.Set(reflect.ValueOf(&ui))
case reflect.Uint32:
ui := clike.Atou32(m[key])
thing.Set(reflect.ValueOf(&ui))
case reflect.Uint16:
ui := clike.Atou16(m[key])
thing.Set(reflect.ValueOf(&ui))
case reflect.Uint8:
ui := uint8(clike.Atou16(m[key]))
thing.Set(reflect.ValueOf(&ui))
case reflect.Float64:
fv := clike.Atof(m[key])
thing.Set(reflect.ValueOf(&fv))
case reflect.Float32:
fv := float32(clike.Atof(m[key]))
thing.Set(reflect.ValueOf(&fv))
case reflect.Bool:
b := m[key] == "true" || m[key] == "True" || m[key] == "TRUE"
thing.Set(reflect.ValueOf(&b))
case reflect.Struct:
map_to_struct(m, p, p.Type(), tag_id, pfx) // recurse to process
}
case reflect.Int, reflect.Int64, reflect.Int32, reflect.Int16, reflect.Int8:
thing.SetInt(clike.Atoi64(m[key]))
case reflect.Uint, reflect.Uint64, reflect.Uint32, reflect.Uint16, reflect.Uint8:
thing.SetUint(uint64(clike.Atoi64(m[key])))
case reflect.Float64, reflect.Float32:
thing.SetFloat(clike.Atof(m[key]))
case reflect.Bool:
thing.SetBool(m[key] == "true")
case reflect.Map:
new_map := reflect.MakeMap(thing.Type()) // create the map
thing.Set(new_map) // put it in the struct
idx := key + "/" // now populate the map
ilen := len(idx)
for k, _ := range m { // we could keep a separate list of keys, but for now this should do
if strings.HasPrefix(k, key) {
tokens := strings.Split(k[ilen:], "/")
map_key := reflect.ValueOf(tokens[0]) // map key is everything past the tag to the next slant
map_ele_type := new_map.Type().Elem() // the type of the element that the map references
mthing := reflect.New(map_ele_type).Elem() // new returns pointer, so dereference with Elem() (value not type!)
set_value(mthing, mthing.Kind(), idx+tokens[0], tag_id, idx+tokens[0]+"/", false, m) // put the value into the map thing
new_map.SetMapIndex(map_key, mthing) // put it into the map (order IS important; add to map after recursion)
//fmt.Fprintf( os.Stderr, "saving: %s thing-type=%s mthing=%s\n", map_key, thing.Type(), mthing )
}
}
case reflect.Slice:
c := clike.Atoi(m[key+".cap"])
l := clike.Atoi(m[key+".len"])
thing.Set(reflect.MakeSlice(thing.Type(), l, c)) // create a new slice with the same len/cap that it had
for j := 0; j < l; j++ {
idx := fmt.Sprintf("%s/%d", key, j)
set_value(thing.Index(j), thing.Type().Elem().Kind(), idx, tag_id, idx+"/", false, m) // populate each value of the slice up to len
}
case reflect.Struct:
if annon {
map_to_struct(m, thing, thing.Type(), tag_id, key) // anon structs share namespace, so prefix is the same
} else {
map_to_struct(m, thing, thing.Type(), tag_id, pfx) // dive to get the substruct adding a level to the prefix
}
}
}
/*
the main go routine to act on messages sent to our channel. We expect messages from the
reservation manager, and from a tickler that causes us to evaluate the need to resize
ovs queues.
DSCP values: Dscp values range from 0-64 decimal, but when described on or by
flow-mods are shifted two bits to the left. The send flow mod function will
do the needed shifting so all values outside of that one funciton should assume/use
decimal values in the range of 0-64.
*/
func Fq_mgr(my_chan chan *ipc.Chmsg, sdn_host *string) {
var (
uri_prefix string = ""
msg *ipc.Chmsg
data []interface{} // generic list of data on some requests
fdata *Fq_req // flow-mod request data
qcheck_freq int64 = 5
hcheck_freq int64 = 180
host_list *string // current set of openstack real hosts
ip2mac map[string]*string // translation from ip address to mac
switch_hosts *string // from config file and overrides openstack list if given (mostly testing)
ssq_cmd *string // command string used to set switch queues (from config file)
send_all bool = false // send all flow-mods; false means send just ingress/egress and not intermediate switch f-mods
alt_table int = DEF_ALT_TABLE // meta data marking table
phost_suffix *string = nil // physical host suffix added to each host name in the list from openstack (config)
//max_link_used int64 = 0 // the current maximum link utilisation
)
fq_sheep = bleater.Mk_bleater(0, os.Stderr) // allocate our bleater and attach it to the master
fq_sheep.Set_prefix("fq_mgr")
tegu_sheep.Add_child(fq_sheep) // we become a child so that if the master vol is adjusted we'll react too
// -------------- pick up config file data if there --------------------------------
if *sdn_host == "" { // not supplied on command line, pull from config
if sdn_host = cfg_data["default"]["sdn_host"]; sdn_host == nil { // no default; when not in config, then it's turned off and we send to agent
sdn_host = &empty_str
}
}
if cfg_data["default"]["queue_type"] != nil {
if *cfg_data["default"]["queue_type"] == "endpoint" {
send_all = false
} else {
send_all = true
}
}
if p := cfg_data["default"]["alttable"]; p != nil { // this is the base; we use alt_table to alt_table + (n-1) when we need more than 1 table
alt_table = clike.Atoi(*p)
}
if cfg_data["fqmgr"] != nil { // pick up things in our specific setion
if dp := cfg_data["fqmgr"]["ssq_cmd"]; dp != nil { // set switch queue command
ssq_cmd = dp
}
/*
if p := cfg_data["fqmgr"]["default_dscp"]; p != nil { // this is a single value and should not be confused with the dscp list in the default section of the config
dscp = clike.Atoi( *p )
}
*/
if p := cfg_data["fqmgr"]["queue_check"]; p != nil { // queue check frequency from the control file
qcheck_freq = clike.Atoi64(*p)
if qcheck_freq < 5 {
qcheck_freq = 5
}
}
if p := cfg_data["fqmgr"]["host_check"]; p != nil { // frequency of checking for new _real_ hosts from openstack
hcheck_freq = clike.Atoi64(*p)
if hcheck_freq < 30 {
hcheck_freq = 30
}
}
if p := cfg_data["fqmgr"]["switch_hosts"]; p != nil {
switch_hosts = p
}
if p := cfg_data["fqmgr"]["verbose"]; p != nil {
fq_sheep.Set_level(uint(clike.Atoi(*p)))
}
if p := cfg_data["fqmgr"]["phost_suffix"]; p != nil { // suffix added to physical host strings for agent commands
if *p != "" {
phost_suffix = p
fq_sheep.Baa(1, "physical host names will be suffixed with: %s", *phost_suffix)
}
}
}
// ----- end config file munging ---------------------------------------------------
//tklr.Add_spot( qcheck_freq, my_chan, REQ_SETQUEUES, nil, ipc.FOREVER ); // tickle us every few seconds to adjust the ovs queues if needed
if switch_hosts == nil {
tklr.Add_spot(2, my_chan, REQ_CHOSTLIST, nil, 1) // tickle once, very soon after starting, to get a host list
tklr.Add_spot(hcheck_freq, my_chan, REQ_CHOSTLIST, nil, ipc.FOREVER) // tickles us every once in a while to update host list
fq_sheep.Baa(2, "host list will be requested from openstack every %ds", hcheck_freq)
} else {
host_list = switch_hosts
fq_sheep.Baa(0, "static host list from config used for setting OVS queues: %s", *host_list)
}
if sdn_host != nil && *sdn_host != "" {
uri_prefix = fmt.Sprintf("http://%s", *sdn_host)
}
fq_sheep.Baa(1, "flowmod-queue manager is running, sdn host: %s", *sdn_host)
for {
msg = <-my_chan // wait for next message
msg.State = nil // default to all OK
fq_sheep.Baa(3, "processing message: %d", msg.Msg_type)
switch msg.Msg_type {
case REQ_GEN_FMOD: // generic fmod; just pass it along w/o any special handling
if msg.Req_data != nil {
fdata = msg.Req_data.(*Fq_req) // pointer at struct with all of our expected goodies
send_gfmod_agent(fdata, ip2mac, host_list, phost_suffix)
}
case REQ_BWOW_RESERVE: // oneway bandwidth flow-mod generation
msg.Response_ch = nil // nothing goes back from this
fdata = msg.Req_data.(*Fq_req) // pointer at struct with all of the expected goodies
send_bwow_fmods(fdata, ip2mac, phost_suffix)
case REQ_BW_RESERVE: // bandwidth endpoint flow-mod creation; single agent script creates all needed fmods
fdata = msg.Req_data.(*Fq_req) // pointer at struct with all of the expected goodies
send_bw_fmods(fdata, ip2mac, phost_suffix)
msg.Response_ch = nil // nothing goes back from this
case REQ_IE_RESERVE: // proactive ingress/egress reservation flowmod (this is likely deprecated as of 3/21/2015 -- resmgr invokes the bw_fmods script via agent)
fdata = msg.Req_data.(*Fq_req) // user view of what the flow-mod should be
if uri_prefix != "" { // an sdn controller -- skoogi -- is enabled
msg.State = gizmos.SK_ie_flowmod(&uri_prefix, *fdata.Match.Ip1, *fdata.Match.Ip2, fdata.Expiry, fdata.Espq.Queuenum, fdata.Espq.Switch, fdata.Espq.Port)
if msg.State == nil { // no error, no response to requestor
fq_sheep.Baa(2, "proactive reserve successfully sent: uri=%s h1=%s h2=%s exp=%d qnum=%d swid=%s port=%d dscp=%d",
uri_prefix, fdata.Match.Ip1, fdata.Match.Ip2, fdata.Expiry, fdata.Espq.Queuenum, fdata.Espq.Switch, fdata.Espq.Port)
msg.Response_ch = nil
} else {
// do we need to suss out the id and mark it failed, or set a timer on it, so as not to flood reqmgr with errors?
fq_sheep.Baa(1, "ERR: proactive reserve failed: uri=%s h1=%s h2=%s exp=%d qnum=%d swid=%s port=%d [TGUFQM008]",
uri_prefix, fdata.Match.Ip1, fdata.Match.Ip2, fdata.Expiry, fdata.Espq.Queuenum, fdata.Espq.Switch, fdata.Espq.Port)
}
} else {
// q-lite now generates one flowmod in each direction because of the ITONS requirements
if send_all || fdata.Espq.Queuenum > 1 { // if sending all fmods, or this has a non-intermediate queue
cdata := fdata.Clone() // copy so we can alter w/o affecting sender's copy
if cdata.Espq.Port == -128 { // we'll assume in this case that the switch given is the host name and we need to set the switch to br-int
swid := "br-int"
cdata.Swid = &swid
}
if cdata.Resub == nil {
resub_list := "" // resub to alternate table to set a meta mark, then to table 0 to hit openstack junk
if cdata.Single_switch || fdata.Dir_in { // must use the base table for inbound traffic OR same switch traffic (bug 2015/1/26)
resub_list = fmt.Sprintf("%d 0", alt_table) // base alt_table is for 'local' traffic (trafic that doesn't go through br-rl
} else {
resub_list = fmt.Sprintf("%d 0", alt_table+1) // base+1 is for OUTBOUND only traffic that must go through the rate limiting bridge
}
cdata.Resub = &resub_list
}
meta := "0x00/0x07" // match-value/mask; match only when meta neither of our two bits, nor the agent bit (0x04) are set
cdata.Match.Meta = &meta
if fdata.Dir_in { // inbound to this switch we need to revert dscp from our settings to the 'origianal' settings
if cdata.Single_switch {
cdata.Match.Dscp = -1 // there is no match if both on same switch
send_gfmod_agent(cdata, ip2mac, host_list, phost_suffix)
} else {
cdata.Match.Dscp = cdata.Dscp // match the dscp that was added on ingress
if !cdata.Dscp_koe { // dropping the value on exit
cdata.Action.Dscp = 0 // set action to turn it off, otherwise we let it ride (no overt action)
}
send_gfmod_agent(cdata, ip2mac, host_list, phost_suffix)
}
} else { // outbound from this switch set the dscp value specified on the reservation
cdata.Match.Dscp = -1 // on outbound there is no dscp match, ensure this is off
if cdata.Single_switch {
send_gfmod_agent(cdata, ip2mac, host_list, phost_suffix) // in single switch mode there is no dscp value needed
} else {
cdata.Action.Dscp = cdata.Dscp // otherwise set the value and send
send_gfmod_agent(cdata, ip2mac, host_list, phost_suffix)
}
}
}
msg.Response_ch = nil
}
case REQ_ST_RESERVE: // reservation fmods for traffic steering
msg.Response_ch = nil // for now, nothing goes back
if msg.Req_data != nil {
fq_data := msg.Req_data.(*Fq_req) // request data
if uri_prefix != "" { // an sdn controller -- skoogi -- is enabled (not supported)
fq_sheep.Baa(0, "ERR: steering reservations are not supported with skoogi (SDNC); no flow-mods pushed")
} else {
send_stfmod_agent(fq_data, ip2mac, host_list)
}
} else {
fq_sheep.Baa(0, "CRI: missing data on st-reserve request to fq-mgr")
}
case REQ_SK_RESERVE: // send a reservation to skoogi
data = msg.Req_data.([]interface{}) // msg data expected to be array of interface: h1, h2, expiry, queue h1/2 must be IP addresses
if uri_prefix != "" {
fq_sheep.Baa(2, "msg to reserve: %s %s %s %d %d", uri_prefix, data[0].(string), data[1].(string), data[2].(int64), data[3].(int))
msg.State = gizmos.SK_reserve(&uri_prefix, data[0].(string), data[1].(string), data[2].(int64), data[3].(int))
} else {
fq_sheep.Baa(1, "reservation not sent, no sdn-host defined: %s %s %s %d %d", uri_prefix, data[0].(string), data[1].(string), data[2].(int64), data[3].(int))
}
case REQ_SETQUEUES: // request from reservation manager which indicates something changed and queues need to be reset
qlist := msg.Req_data.([]interface{})[0].([]string)
if ssq_cmd != nil {
adjust_queues(qlist, ssq_cmd, host_list) // if writing to a file and driving a local script
} else {
adjust_queues_agent(qlist, host_list, phost_suffix) // if sending json to an agent
}
case REQ_CHOSTLIST: // this is tricky as it comes from tickler as a request, and from osifmgr as a response, be careful!
msg.Response_ch = nil // regardless of source, we should not reply to this request
if msg.State != nil || msg.Response_data != nil { // response from ostack if with list or error
if msg.Response_data.(*string) != nil {
hls := strings.TrimLeft(*(msg.Response_data.(*string)), " \t") // ditch leading whitespace
hl := &hls
if *hl != "" {
host_list = hl // ok to use it
if phost_suffix != nil {
fq_sheep.Baa(2, "host list from osif before suffix added: %s", *host_list)
host_list = add_phost_suffix(host_list, phost_suffix) // in some cases ostack sends foo, but we really need to use foo-suffix (sigh)
}
send_hlist_agent(host_list) // send to agent_manager
fq_sheep.Baa(2, "host list received from osif: %s", *host_list)
} else {
fq_sheep.Baa(1, "host list received from osif was discarded: ()")
}
} else {
fq_sheep.Baa(0, "WRN: no data from openstack; expected host list string [TGUFQM009]")
}
} else {
req_hosts(my_chan, fq_sheep) // send requests to osif for data
}
case REQ_IP2MACMAP: // a new map from osif
if msg.Req_data != nil {
newmap := msg.Req_data.(map[string]*string)
if len(newmap) > 0 {
ip2mac = newmap // safe to replace
fq_sheep.Baa(2, "ip2mac translation received from osif: %d elements", len(ip2mac))
} else {
if ip2mac != nil {
fq_sheep.Baa(2, "ip2mac translation received from osif: 0 elements -- kept old table with %d elements", len(ip2mac))
} else {
fq_sheep.Baa(2, "ip2mac translation received from osif: 0 elements -- no existing table to keep")
}
}
} else {
fq_sheep.Baa(0, "WRN: no data from osif (nil map); expected ip2mac translation map [TGUFQM010]")
}
msg.State = nil // state is always good
default:
fq_sheep.Baa(1, "unknown request: %d", msg.Msg_type)
msg.Response_data = nil
if msg.Response_ch != nil {
msg.State = fmt.Errorf("unknown request (%d)", msg.Msg_type)
}
}
fq_sheep.Baa(3, "processing message complete: %d", msg.Msg_type)
if msg.Response_ch != nil { // if a reqponse channel was provided
fq_sheep.Baa(3, "sending response: %d", msg.Msg_type)
msg.Response_ch <- msg // send our result back to the requestor
}
}
}