100 lines
3.6 KiB
Go
100 lines
3.6 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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"github.com/golang/glog"
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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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// A ProviderHost hosts provider plugins and makes them easily accessible by package name.
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type ProviderHost interface {
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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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Analyzer(nm tokens.QName) (Analyzer, error)
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// Provider fetches the provider for a given package, lazily allocating it if necessary. If a provider for this
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// package could not be found, or an error occurs while creating it, a non-nil error is returned.
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Provider(pkg tokens.Package) (Provider, error)
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// Close reclaims any resources associated with the host.
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Close() error
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}
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// NewDefaultProviderHost implements the standard plugin logic, using the standard installation root to find them.
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func NewDefaultProviderHost(ctx *Context) ProviderHost {
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return &defaultProviderHost{
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ctx: ctx,
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analyzers: make(map[tokens.QName]Analyzer),
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providers: make(map[tokens.Package]Provider),
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}
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}
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type defaultProviderHost struct {
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ctx *Context // the shared context for this host.
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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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}
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func (host *defaultProviderHost) 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 := host.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(host.ctx, name)
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if err == nil {
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host.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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func (host *defaultProviderHost) 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 := host.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(host.ctx, pkg)
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if err == nil {
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host.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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func (host *defaultProviderHost) Close() error {
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// Close all plugins.
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for _, plugin := range host.analyzers {
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if err := plugin.Close(); err != nil {
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glog.Infof("Error closing '%v' analyzer plugin during shutdown; ignoring: %v", plugin.Name(), err)
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}
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}
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for _, plugin := range host.providers {
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if err := plugin.Close(); err != nil {
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glog.Infof("Error closing '%v' provider plugin during shutdown; ignoring: %v", plugin.Pkg(), err)
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}
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}
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// Empty out all maps.
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host.analyzers = make(map[tokens.QName]Analyzer)
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host.providers = make(map[tokens.Package]Provider)
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return nil
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}
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