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config.go
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config.go
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// Copyright (C) 2024 Storj Labs, Inc.
// See LICENSE for copying information.
package nodeselection
import (
"bytes"
"os"
"strings"
"github.com/jtolio/mito"
"github.com/zeebo/errs"
"gopkg.in/yaml.v3"
"storj.io/common/storj"
)
// placementConfig is the representation of YAML based placement configuration.
type placementConfig struct {
// helpers which can be re-used later to simplify config
Templates map[string]string
// the placement definitions
Placements []placementDefinition
}
type placementDefinition struct {
ID storj.PlacementConstraint
Name string
Filter string
Invariant string
Selector string
}
// LoadConfig loads the placement yaml file and creates the Placement definitions.
func LoadConfig(configFile string) (PlacementDefinitions, error) {
placements := make(PlacementDefinitions)
cfg := &placementConfig{}
raw, err := os.ReadFile(configFile)
if err != nil {
return placements, errs.New("Couldn't load placement config from file %s: %v", configFile, err)
}
err = yaml.Unmarshal(raw, &cfg)
if err != nil {
return placements, errs.New("Couldn't parse placement config as YAML from file %s: %v", configFile, err)
}
templates := map[string]string{}
for k, v := range cfg.Templates {
value := v
for a, b := range cfg.Templates {
value = strings.ReplaceAll(value, "$"+a, b)
}
templates[k] = value
}
resolveTemplates := func(orig string) string {
val := orig
for k, v := range templates {
val = strings.ReplaceAll(val, "$"+k, v)
}
return val
}
for _, def := range cfg.Placements {
p := Placement{
ID: def.ID,
Name: def.Name,
}
filter := resolveTemplates(def.Filter)
p.NodeFilter, err = filterFromString(filter)
if err != nil {
return placements, errs.New("Filter definition '%s' of placement %d is invalid: %v", filter, def.ID, err)
}
invariant := resolveTemplates(def.Invariant)
p.Invariant, err = invariantFromString(invariant)
if err != nil {
return placements, errs.New("Invariant definition '%s' of placement %d is invalid: %v", invariant, def.ID, err)
}
selector := resolveTemplates(def.Selector)
p.Selector, err = selectorFromString(selector)
if err != nil {
return placements, errs.New("Selector definition '%s' of placement %d is invalid: %v", selector, def.ID, err)
}
placements[def.ID] = p
}
return placements, nil
}
func filterFromString(expr string) (NodeFilter, error) {
if expr == "" {
expr = "all()"
}
env := map[any]any{
"country": func(countries ...string) (NodeFilter, error) {
return NewCountryFilterFromString(countries)
},
"all": func(filters ...NodeFilter) (NodeFilters, error) {
res := NodeFilters{}
for _, filter := range filters {
res = append(res, filter)
}
return res, nil
},
mito.OpAnd: func(env map[any]any, a, b any) (any, error) {
filter1, ok1 := a.(NodeFilter)
filter2, ok2 := b.(NodeFilter)
if !ok1 || !ok2 {
return nil, ErrPlacement.New("&& is supported only between NodeFilter instances")
}
res := NodeFilters{filter1, filter2}
return res, nil
},
mito.OpOr: func(env map[any]any, a, b any) (any, error) {
filter1, ok1 := a.(NodeFilter)
filter2, ok2 := b.(NodeFilter)
if !ok1 || !ok2 {
return nil, errs.New("OR is supported only between NodeFilter instances")
}
return OrFilter{filter1, filter2}, nil
},
"tag": func(nodeIDstr string, key string, value any) (NodeFilters, error) {
nodeID, err := storj.NodeIDFromString(nodeIDstr)
if err != nil {
return nil, err
}
var rawValue []byte
match := bytes.Equal
switch v := value.(type) {
case string:
rawValue = []byte(v)
case []byte:
rawValue = v
case stringNotMatch:
match = func(a, b []byte) bool {
return !bytes.Equal(a, b)
}
rawValue = []byte(v)
default:
return nil, ErrPlacement.New("3rd argument of tag() should be string or []byte")
}
res := NodeFilters{
NewTagFilter(nodeID, key, rawValue, match),
}
return res, nil
},
"exclude": func(filter NodeFilter) (NodeFilter, error) {
return NewExcludeFilter(filter), nil
},
"empty": func() string {
return ""
},
"notEmpty": func() any {
return stringNotMatch("")
},
}
filter, err := mito.Eval(expr, env)
if err != nil {
return nil, errs.New("Invalid filter definition '%s', %v", expr, err)
}
return filter.(NodeFilter), nil
}
func selectorFromString(expr string) (NodeSelectorInit, error) {
if expr == "" {
expr = "random()"
}
env := map[any]any{
"attribute": func(attribute string) (NodeSelectorInit, error) {
attr, err := CreateNodeAttribute(attribute)
if err != nil {
return nil, err
}
return AttributeGroupSelector(attr), nil
},
"random": func() (NodeSelectorInit, error) {
return RandomSelector(), nil
},
"unvetted": func(newNodeRatio float64, def NodeSelectorInit) (NodeSelectorInit, error) {
return UnvettedSelector(newNodeRatio, def), nil
},
}
selector, err := mito.Eval(expr, env)
if err != nil {
return nil, errs.New("Invalid selector definition '%s', %v", expr, err)
}
return selector.(NodeSelectorInit), nil
}
func invariantFromString(expr string) (Invariant, error) {
if expr == "" {
return AllGood(), nil
}
env := map[any]any{
"maxcontrol": func(attribute string, max int64) (Invariant, error) {
attr, err := CreateNodeAttribute(attribute)
if err != nil {
return nil, err
}
return ClumpingByAttribute(attr, int(max)), nil
},
}
filter, err := mito.Eval(expr, env)
if err != nil {
return nil, errs.New("Invalid invariant definition '%s', %v", expr, err)
}
return filter.(Invariant), nil
}