107 lines
3.9 KiB
Go
107 lines
3.9 KiB
Go
// Licensed to Pulumi Corporation ("Pulumi") under one or more
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// contributor license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright ownership.
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// Pulumi licenses this file to You under the Apache License, Version 2.0
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// (the "License"); you may not use this file except in compliance with
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// the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package resource
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import (
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"context"
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"github.com/golang/glog"
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"github.com/pulumi/lumi/pkg/diag"
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"github.com/pulumi/lumi/pkg/eval/rt"
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"github.com/pulumi/lumi/pkg/tokens"
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"github.com/pulumi/lumi/pkg/util/contract"
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)
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// Context is used to group related operations together so that associated OS resources can be cached, shared, and
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// reclaimed as appropriate.
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type Context struct {
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Diag diag.Sink // the diagnostics sink to use for messages.
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Analyzers map[tokens.QName]Analyzer // a cache of analyzer plugins and their processes.
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Providers map[tokens.Package]Provider // a cache of provider plugins and their processes.
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ObjRes objectResourceMap // the resources held inside of this snapshot.
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ObjURN objectURNMap // a convenient lookup map for object to urn.
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URNRes urnResourceMap // a convenient lookup map for urn to resource.
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URNOldIDs urnIDMap // a convenient lookup map for urns to old IDs.
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}
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type objectURNMap map[*rt.Object]URN
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type objectResourceMap map[*rt.Object]Resource
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type urnResourceMap map[URN]Resource
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type urnIDMap map[URN]ID
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func NewContext(d diag.Sink) *Context {
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return &Context{
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Diag: d,
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Analyzers: make(map[tokens.QName]Analyzer),
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Providers: make(map[tokens.Package]Provider),
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ObjRes: make(objectResourceMap),
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ObjURN: make(objectURNMap),
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URNRes: make(urnResourceMap),
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URNOldIDs: make(urnIDMap),
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}
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}
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// Analyzer fetches the analyzer with a given name, possibly lazily allocating the plugins for it. If an analyzer
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// could not be found, or an error occurred while creating it, a non-nil error is returned.
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func (ctx *Context) Analyzer(name tokens.QName) (Analyzer, error) {
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// First see if we already loaded this plugin.
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if plug, has := ctx.Analyzers[name]; has {
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contract.Assert(plug != nil)
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return plug, nil
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}
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// If not, try to load and bind to a plugin.
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plug, err := NewAnalyzer(ctx, name)
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if err == nil {
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ctx.Analyzers[name] = plug // memoize the result.
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}
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return plug, err
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}
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// Provider fetches the provider for a given resource, possibly lazily allocating the plugins for it. If a provider
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// could not be found, or an error occurred while creating it, a non-nil error is returned.
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func (ctx *Context) Provider(pkg tokens.Package) (Provider, error) {
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// First see if we already loaded this plugin.
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if plug, has := ctx.Providers[pkg]; has {
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contract.Assert(plug != nil)
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return plug, nil
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}
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// If not, try to load and bind to a plugin.
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plug, err := NewProvider(ctx, pkg)
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if err == nil {
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ctx.Providers[pkg] = plug // memoize the result.
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}
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return plug, err
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}
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// Request allocates a request sub-context.
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func (ctx *Context) Request() context.Context {
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// TODO: support cancellation.
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return context.TODO()
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}
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// Close reclaims all resources associated with this context.
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func (ctx *Context) Close() error {
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for _, plugin := range ctx.Providers {
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if err := plugin.Close(); err != nil {
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glog.Infof("Error closing '%v' plugin during shutdown; ignoring: %v", plugin.Pkg(), err)
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}
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}
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ctx.Providers = make(map[tokens.Package]Provider) // empty out the plugin map
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return nil
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}
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