f6e694c72b
This includes a few changes: * The repo name -- and hence the Go modules -- changes from pulumi-fabric to pulumi. * The Node.js SDK package changes from @pulumi/pulumi-fabric to just pulumi. * The CLI is renamed from lumi to pulumi.
123 lines
4.3 KiB
Go
123 lines
4.3 KiB
Go
// Copyright 2016-2017, Pulumi Corporation. All rights reserved.
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package plugin
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import (
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"github.com/golang/glog"
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"github.com/pulumi/pulumi/pkg/diag"
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"github.com/pulumi/pulumi/pkg/tokens"
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"github.com/pulumi/pulumi/pkg/util/contract"
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)
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// A Host hosts provider plugins and makes them easily accessible by package name.
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type Host interface {
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// ServerAddr returns the address at which the host's RPC interface may be found.
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ServerAddr() string
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// Log logs a global message, including errors and warnings.
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Log(sev diag.Severity, msg string)
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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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// LanguageRuntime fetches the language runtime plugin for a given language, lazily allocating if necessary. If
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// an implementation of this language runtime wasn't found, on an error occurs, a non-nil error is returned.
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LanguageRuntime(runtime string, monitorAddr string) (LanguageRuntime, 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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// NewDefaultHost implements the standard plugin logic, using the standard installation root to find them.
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func NewDefaultHost(ctx *Context) (Host, error) {
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host := &defaultHost{
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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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// Fire up a gRPC server to listen for requests. This acts as a RPC interface that plugins can use
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// to "phone home" in case there are things the host must do on behalf of the plugins (like log, etc).
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svr, err := newHostServer(host, ctx)
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if err != nil {
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return nil, err
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}
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host.server = svr
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return host, nil
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}
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type defaultHost 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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server *hostServer // the server's RPC machinery.
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}
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func (host *defaultHost) ServerAddr() string {
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return host.server.Address()
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}
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func (host *defaultHost) Log(sev diag.Severity, msg string) {
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host.ctx.Diag.Logf(sev, diag.Message(msg))
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}
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func (host *defaultHost) 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, host.ctx, name)
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if err == nil && plug != 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 *defaultHost) 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, host.ctx, pkg)
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if err == nil && plug != 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 *defaultHost) LanguageRuntime(runtime string, monitorAddr string) (LanguageRuntime, error) {
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// Always load a fresh language runtime, since each has a unique resource monitor session.
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return NewLanguageRuntime(host, host.ctx, runtime, monitorAddr)
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}
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func (host *defaultHost) 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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// Finally, shut down the host's gRPC server.
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return host.server.Cancel()
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}
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