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package slinkwatch
// This file is part of slinkwatch.
//
// slinkwatch is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// slinkwatch is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with slinkwatch; if not, write to the Free Software Foundation,
// Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
import (
"bytes"
"math"
"runtime"
"text/template"
yaml "gopkg.in/yaml.v2"
)
// InterfaceInfo contains basic information about a specific interface entry.
type InterfaceInfo struct {
Threads int
ClusterID int
ExtraOptions map[string]string
}
// ActiveSet contains descriptions of the currently connected interfaces.
type ActiveSet struct {
Config *Config
Ifaces map[string]InterfaceInfo
}
// MakeActiveSet returns a new empty ActiveSet.
func MakeActiveSet(config *Config) *ActiveSet {
return &ActiveSet{
Config: config,
Ifaces: make(map[string]InterfaceInfo),
}
}
// Reset clears the interfaces associated with an ActiveSet.
func (a *ActiveSet) Reset() {
a.Ifaces = make(map[string]InterfaceInfo)
}
// String returns a string representation of an ActiveSet, listing its
// interfaces.
func (a *ActiveSet) String() string {
out := ""
i := 0
if len(a.Ifaces) == 0 {
return "<empty>"
}
for k := range a.Ifaces {
out += k
if i != len(a.Ifaces)-1 {
out += "/"
i++
}
}
return out
}
// Add adds an interface to a given ActiveSet.
func (a *ActiveSet) Add(iface string) {
if _, ok := a.Config.Ifaces[iface]; ok {
a.Ifaces[iface] = InterfaceInfo{}
}
// from here we can assume that we only handle the intersection of the
// configured interfaces and the observed interfaces
}
// Len returns the number of interfaces in the active set.
func (a *ActiveSet) Len() int {
return len(a.Ifaces)
}
// ToYAML returns the YAML representation of an ActiveSet, given a template and
// a configuration with thread weights.
func (a *ActiveSet) ToYAML(tmpl *template.Template, config *Config) (string, error) {
threads := runtime.NumCPU()
totalweight := 0
for intf := range a.Ifaces {
totalweight += config.Ifaces[intf].ThreadWeight
}
for intf := range a.Ifaces {
a.Ifaces[intf] = InterfaceInfo{
Threads: int(math.Ceil(float64(threads) * (float64(config.Ifaces[intf].ThreadWeight) / float64(totalweight)))),
ClusterID: config.Ifaces[intf].ClusterID,
ExtraOptions: config.Ifaces[intf].ExtraOptions,
}
}
buf := new(bytes.Buffer)
err := tmpl.Execute(buf, a.Ifaces)
if err != nil {
return "", err
}
var t interface{}
err = yaml.Unmarshal(buf.Bytes(), &t)
if err != nil {
return "", err
}
return buf.String(), nil
}
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