This avoids unnecessary blocking inside pre/post-step callbacks if the reader on the other side of the event channel is slow. We do not use a buffered channel in the event pipe because it is empirically less likely that the goroutine reading from a buffered channel will be scheduled when new data is placed in the channel. In the case of our event system in which events will not be delivered to the service and display until the copying goroutine is scheduled, this can lead to unacceptable delay between the send of the original event and its output.
75 lines
2.5 KiB
Go
75 lines
2.5 KiB
Go
// Copyright 2016-2018, Pulumi Corporation.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// 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 engine
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import (
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"github.com/pulumi/pulumi/pkg/resource/deploy"
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"github.com/pulumi/pulumi/pkg/resource/plugin"
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"github.com/pulumi/pulumi/pkg/util/contract"
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"github.com/pulumi/pulumi/pkg/util/logging"
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"github.com/pulumi/pulumi/pkg/util/result"
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"github.com/pulumi/pulumi/pkg/workspace"
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)
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func Refresh(u UpdateInfo, ctx *Context, opts UpdateOptions, dryRun bool) (ResourceChanges, result.Result) {
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contract.Require(u != nil, "u")
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contract.Require(ctx != nil, "ctx")
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defer func() { ctx.Events <- cancelEvent() }()
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info, err := newPlanContext(u, "refresh", ctx.ParentSpan)
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if err != nil {
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return nil, result.FromError(err)
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}
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defer info.Close()
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emitter, err := makeEventEmitter(ctx.Events, u)
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if err != nil {
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return nil, result.FromError(err)
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}
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defer emitter.Close()
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// Force opts.Refresh to true.
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opts.Refresh = true
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return update(ctx, info, planOptions{
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UpdateOptions: opts,
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SourceFunc: newRefreshSource,
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Events: emitter,
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Diag: newEventSink(emitter, false),
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StatusDiag: newEventSink(emitter, true),
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isRefresh: true,
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}, dryRun)
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}
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func newRefreshSource(client deploy.BackendClient, opts planOptions, proj *workspace.Project, pwd, main string,
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target *deploy.Target, plugctx *plugin.Context, dryRun bool) (deploy.Source, error) {
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// Like Update, we need to gather the set of plugins necessary to refresh everything in the snapshot.
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// Unlike Update, we don't actually run the user's program so we only need the set of plugins described
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// in the snapshot.
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plugins, err := gatherPluginsFromSnapshot(plugctx, target)
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if err != nil {
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return nil, err
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}
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// Like Update, if we're missing plugins, attempt to download the missing plugins.
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if err := ensurePluginsAreInstalled(plugins); err != nil {
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logging.V(7).Infof("newRefreshSource(): failed to install missing plugins: %v", err)
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}
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// Just return an error source. Refresh doesn't use its source.
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return deploy.NewErrorSource(proj.Name), nil
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}
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