9969286224
This giant patch makes some much needed improvements to the code base. * The engine has been rewritten and lives within engine/graph/ * All of the common interfaces and code now live in engine/ * All of the resources are in one package called engine/resources/ * The Res API can use different "traits" from engine/traits/ * The Res API has been simplified to hide many of the old internals * The Watch & Process loops were previously inverted, but is now fixed * The likelihood of package cycles has been reduced drastically * And much, much more... Unfortunately, some code had to be temporarily removed. The remote code had to be taken out, as did the prometheus code. We hope to have these back in new forms as soon as possible.
122 lines
3.8 KiB
Go
122 lines
3.8 KiB
Go
// Mgmt
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// Copyright (C) 2013-2018+ James Shubin and the project contributors
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// Written by James Shubin <james@shubin.ca> and the project contributors
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package engine
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import (
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"fmt"
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)
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// EdgeableRes is the interface a resource must implement to support automatic
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// edges. Both the vertices involved in an edge need to implement this for it to
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// be able to work.
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type EdgeableRes interface {
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Res // implement everything in Res but add the additional requirements
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// AutoEdgeMeta lets you get or set meta params for the automatic edges
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// trait.
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AutoEdgeMeta() *AutoEdgeMeta
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// UIDs includes all params to make a unique identification of this
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// object.
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UIDs() []ResUID // most resources only return one
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// AutoEdges returns a struct that implements the AutoEdge interface.
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// This interface can be used to generate automatic edges to other
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// resources.
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AutoEdges() (AutoEdge, error)
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}
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// AutoEdgeMeta provides some parameters specific to automatic edges.
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// TODO: currently this only supports disabling the feature per-resource, but in
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// the future you could conceivably have some small pattern to control it better
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type AutoEdgeMeta struct {
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// Disabled specifies that automatic edges should be disabled for this
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// resource.
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Disabled bool
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}
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// Cmp compares two AutoEdgeMeta structs and determines if they're equivalent.
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func (obj *AutoEdgeMeta) Cmp(aem *AutoEdgeMeta) error {
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if obj.Disabled != aem.Disabled {
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return fmt.Errorf("values for Disabled are different")
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}
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return nil
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}
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// The AutoEdge interface is used to implement the autoedges feature.
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type AutoEdge interface {
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Next() []ResUID // call to get list of edges to add
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Test([]bool) bool // call until false
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}
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// ResUID is a unique identifier for a resource, namely it's name, and the kind ("type").
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type ResUID interface {
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fmt.Stringer // String() string
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GetName() string
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GetKind() string
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IFF(ResUID) bool
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IsReversed() bool // true means this resource happens before the generator
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}
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// The BaseUID struct is used to provide a unique resource identifier.
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type BaseUID struct {
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Name string // name and kind are the values of where this is coming from
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Kind string
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Reversed *bool // piggyback edge information here
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}
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// GetName returns the name of the resource UID.
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func (obj *BaseUID) GetName() string {
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return obj.Name
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}
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// GetKind returns the kind of the resource UID.
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func (obj *BaseUID) GetKind() string {
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return obj.Kind
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}
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// String returns the canonical string representation for a resource UID.
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func (obj *BaseUID) String() string {
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return fmt.Sprintf("%s[%s]", obj.GetKind(), obj.GetName())
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}
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// IFF looks at two UID's and if and only if they are equivalent, returns true.
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// If they are not equivalent, it returns false.
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// Most resources will want to override this method, since it does the important
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// work of actually discerning if two resources are identical in function.
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func (obj *BaseUID) IFF(uid ResUID) bool {
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res, ok := uid.(*BaseUID)
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if !ok {
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return false
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}
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return obj.Name == res.Name
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}
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// IsReversed is part of the ResUID interface, and true means this resource
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// happens before the generator.
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func (obj *BaseUID) IsReversed() bool {
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if obj.Reversed == nil {
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panic("programming error!")
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}
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return *obj.Reversed
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}
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