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gconfig.go
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gconfig.go
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// Mgmt
// Copyright (C) 2013-2018+ James Shubin and the project contributors
// Written by James Shubin <james@shubin.ca> and the project contributors
//
// This program 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 3 of the License, or
// (at your option) any later version.
//
// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
// Package yamlgraph provides the facilities for loading a graph from a yaml file.
package yamlgraph
import (
"errors"
"fmt"
"log"
"reflect"
"strings"
"github.com/purpleidea/mgmt/pgraph"
"github.com/purpleidea/mgmt/resources"
errwrap "github.com/pkg/errors"
"gopkg.in/yaml.v2"
)
type collectorResConfig struct {
Kind string `yaml:"kind"`
Pattern string `yaml:"pattern"` // XXX: not implemented
}
// Vertex is the data structure of a vertex.
type Vertex struct {
Kind string `yaml:"kind"`
Name string `yaml:"name"`
}
// Edge is the data structure of an edge.
type Edge struct {
Name string `yaml:"name"`
From Vertex `yaml:"from"`
To Vertex `yaml:"to"`
Notify bool `yaml:"notify"`
}
// Resources is the data structure of the set of resources.
type Resources struct {
// in alphabetical order
Augeas []*resources.AugeasRes `yaml:"augeas"`
AwsEc2 []*resources.AwsEc2Res `yaml:"aws:ec2"`
Exec []*resources.ExecRes `yaml:"exec"`
File []*resources.FileRes `yaml:"file"`
Graph []*resources.GraphRes `yaml:"graph"`
Group []*resources.GroupRes `yaml:"group"`
Hostname []*resources.HostnameRes `yaml:"hostname"`
KV []*resources.KVRes `yaml:"kv"`
Msg []*resources.MsgRes `yaml:"msg"`
Noop []*resources.NoopRes `yaml:"noop"`
Nspawn []*resources.NspawnRes `yaml:"nspawn"`
Password []*resources.PasswordRes `yaml:"password"`
Pkg []*resources.PkgRes `yaml:"pkg"`
Print []*resources.PrintRes `yaml:"print"`
Svc []*resources.SvcRes `yaml:"svc"`
Test []*resources.TestRes `yaml:"test"`
Timer []*resources.TimerRes `yaml:"timer"`
User []*resources.UserRes `yaml:"user"`
Virt []*resources.VirtRes `yaml:"virt"`
}
// GraphConfig is the data structure that describes a single graph to run.
type GraphConfig struct {
Graph string `yaml:"graph"`
Resources Resources `yaml:"resources"`
Collector []collectorResConfig `yaml:"collect"`
Edges []Edge `yaml:"edges"`
Comment string `yaml:"comment"`
Remote string `yaml:"remote"`
}
// Parse parses a data stream into the graph structure.
func (c *GraphConfig) Parse(data []byte) error {
if err := yaml.Unmarshal(data, c); err != nil {
return err
}
if c.Graph == "" {
return errors.New("graph config: invalid graph")
}
return nil
}
// NewGraphFromConfig transforms a GraphConfig struct into a new graph.
// FIXME: remove any possibly left over, now obsolete graph diff code from here!
func (c *GraphConfig) NewGraphFromConfig(hostname string, world resources.World, noop bool) (*pgraph.Graph, error) {
// hostname is the uuid for the host
var graph *pgraph.Graph // new graph to return
var err error
graph, err = pgraph.NewGraph("Graph") // give graph a default name
if err != nil {
return nil, errwrap.Wrapf(err, "could not run NewGraphFromConfig() properly")
}
var lookup = make(map[string]map[string]pgraph.Vertex)
//log.Printf("%+v", config) // debug
// TODO: if defined (somehow)...
graph.SetName(c.Graph) // set graph name
var keep []pgraph.Vertex // list of vertex which are the same in new graph
var resourceList []resources.Res // list of resources to export
// use reflection to avoid duplicating code... better options welcome!
value := reflect.Indirect(reflect.ValueOf(c.Resources))
vtype := value.Type()
for i := 0; i < vtype.NumField(); i++ { // number of fields in struct
name := vtype.Field(i).Name // string of field name
field := value.FieldByName(name)
iface := field.Interface() // interface type of value
slice := reflect.ValueOf(iface)
kind := strings.ToLower(name)
for j := 0; j < slice.Len(); j++ { // loop through resources of same kind
x := slice.Index(j).Interface()
res, ok := x.(resources.Res) // convert to Res type
if !ok {
return nil, fmt.Errorf("Config: Error: Can't convert: %v of type: %T to Res", x, x)
}
res.SetKind(kind) // cheap init
//if noop { // now done in mgmtmain
// res.Meta().Noop = noop
//}
if _, exists := lookup[kind]; !exists {
lookup[kind] = make(map[string]pgraph.Vertex)
}
// XXX: should we export based on a @@ prefix, or a metaparam
// like exported => true || exported => (host pattern)||(other pattern?)
if !strings.HasPrefix(res.GetName(), "@@") { // not exported resource
fn := func(v pgraph.Vertex) (bool, error) {
return resources.VtoR(v).Compare(res), nil
}
v, err := graph.VertexMatchFn(fn)
if err != nil {
return nil, errwrap.Wrapf(err, "could not VertexMatchFn() resource")
}
if v == nil { // no match found
v = res // a standalone res can be a vertex
graph.AddVertex(v) // call standalone in case not part of an edge
}
lookup[kind][res.GetName()] = v // used for constructing edges
keep = append(keep, v) // append
} else if !noop { // do not export any resources if noop
// store for addition to backend storage...
res.SetName(res.GetName()[2:]) //slice off @@
resourceList = append(resourceList, res)
}
}
}
// store in backend (usually etcd)
if err := world.ResExport(resourceList); err != nil {
return nil, fmt.Errorf("Config: Could not export resources: %v", err)
}
// lookup from backend (usually etcd)
var hostnameFilter []string // empty to get from everyone
kindFilter := []string{}
for _, t := range c.Collector {
kind := strings.ToLower(t.Kind)
kindFilter = append(kindFilter, kind)
}
// do all the graph look ups in one single step, so that if the backend
// database changes, we don't have a partial state of affairs...
if len(kindFilter) > 0 { // if kindFilter is empty, don't need to do lookups!
var err error
resourceList, err = world.ResCollect(hostnameFilter, kindFilter)
if err != nil {
return nil, fmt.Errorf("Config: Could not collect resources: %v", err)
}
}
for _, res := range resourceList {
matched := false
// see if we find a collect pattern that matches
for _, t := range c.Collector {
kind := strings.ToLower(t.Kind)
// use t.Kind and optionally t.Pattern to collect from storage
log.Printf("Collect: %v; Pattern: %v", kind, t.Pattern)
// XXX: expand to more complex pattern matching here...
if res.GetKind() != kind {
continue
}
if matched {
// we've already matched this resource, should we match again?
log.Printf("Config: Warning: Matching %s again!", res)
}
matched = true
// collect resources but add the noop metaparam
//if noop { // now done in mgmtmain
// res.Meta().Noop = noop
//}
if t.Pattern != "" { // XXX: simplistic for now
res.CollectPattern(t.Pattern) // res.Dirname = t.Pattern
}
log.Printf("Collect: %s: collected!", res)
// XXX: similar to other resource add code:
if _, exists := lookup[kind]; !exists {
lookup[kind] = make(map[string]pgraph.Vertex)
}
fn := func(v pgraph.Vertex) (bool, error) {
return resources.VtoR(v).Compare(res), nil
}
v, err := graph.VertexMatchFn(fn)
if err != nil {
return nil, errwrap.Wrapf(err, "could not VertexMatchFn() resource")
}
if v == nil { // no match found
v = res // a standalone res can be a vertex
graph.AddVertex(v) // call standalone in case not part of an edge
}
lookup[kind][res.GetName()] = v // used for constructing edges
keep = append(keep, v) // append
//break // let's see if another resource even matches
}
}
for _, e := range c.Edges {
if _, ok := lookup[strings.ToLower(e.From.Kind)]; !ok {
return nil, fmt.Errorf("can't find 'from' kind: %s", e.From.Kind)
}
if _, ok := lookup[strings.ToLower(e.To.Kind)]; !ok {
return nil, fmt.Errorf("can't find 'to' kind: %s", e.To.Kind)
}
if _, ok := lookup[strings.ToLower(e.From.Kind)][e.From.Name]; !ok {
return nil, fmt.Errorf("can't find 'from' name: %s", e.From.Name)
}
if _, ok := lookup[strings.ToLower(e.To.Kind)][e.To.Name]; !ok {
return nil, fmt.Errorf("can't find 'to' name: %s", e.To.Name)
}
from := lookup[strings.ToLower(e.From.Kind)][e.From.Name]
to := lookup[strings.ToLower(e.To.Kind)][e.To.Name]
edge := &resources.Edge{
Name: e.Name,
Notify: e.Notify,
}
graph.AddEdge(from, to, edge)
}
return graph, nil
}
// ParseConfigFromFile takes a filename and returns the graph config structure.
func ParseConfigFromFile(data []byte) *GraphConfig {
var config GraphConfig
if err := config.Parse(data); err != nil {
log.Printf("Config: Error: ParseConfigFromFile: Parse: %v", err)
return nil
}
return &config
}