mirror of https://github.com/pulumi/pulumi.git
128 lines
3.9 KiB
Go
128 lines
3.9 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 plugin
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import (
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"context"
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"io/ioutil"
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"github.com/opentracing/opentracing-go"
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"github.com/pulumi/pulumi/sdk/v3/go/common/diag"
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"github.com/pulumi/pulumi/sdk/v3/go/common/diag/colors"
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"github.com/pulumi/pulumi/sdk/v3/go/common/util/rpcutil"
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)
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// Context is used to group related operations together so that
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// associated OS resources can be cached, shared, and reclaimed as
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// appropriate. It also carries shared plugin configuration.
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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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StatusDiag diag.Sink // the diagnostics sink to use for status messages.
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Host Host // the host that can be used to fetch providers.
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Pwd string // the working directory to spawn all plugins in.
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Root string // the root directory of the project.
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tracingSpan opentracing.Span // the OpenTracing span to parent requests within.
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cancelFuncs []context.CancelFunc
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baseContext context.Context
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}
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// NewContext allocates a new context with a given sink and host. Note
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// that the host is "owned" by this context from here forwards, such
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// that when the context's resources are reclaimed, so too are the
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// host's.
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func NewContext(d, statusD diag.Sink, host Host, cfg ConfigSource,
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pwd string, runtimeOptions map[string]interface{}, disableProviderPreview bool,
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parentSpan opentracing.Span) (*Context, error) {
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root := ""
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return NewContextWithRoot(d, statusD, host, cfg, pwd, root, runtimeOptions, disableProviderPreview, parentSpan)
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}
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// Variation of NewContext that also sets known project Root.
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func NewContextWithRoot(d, statusD diag.Sink, host Host, cfg ConfigSource,
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pwd, root string, runtimeOptions map[string]interface{}, disableProviderPreview bool,
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parentSpan opentracing.Span) (*Context, error) {
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if d == nil {
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d = diag.DefaultSink(ioutil.Discard, ioutil.Discard, diag.FormatOptions{Color: colors.Never})
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}
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if statusD == nil {
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statusD = diag.DefaultSink(ioutil.Discard, ioutil.Discard, diag.FormatOptions{Color: colors.Never})
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}
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ctx := &Context{
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Diag: d,
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StatusDiag: statusD,
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Host: host,
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Pwd: pwd,
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tracingSpan: parentSpan,
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}
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if host == nil {
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h, err := NewDefaultHost(ctx, cfg, runtimeOptions, disableProviderPreview)
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if err != nil {
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return nil, err
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}
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ctx.Host = h
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}
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return ctx, nil
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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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c := ctx.baseContext
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if c == nil {
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c = context.Background()
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}
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c = opentracing.ContextWithSpan(c, ctx.tracingSpan)
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c, cancel := context.WithCancel(c)
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ctx.cancelFuncs = append(ctx.cancelFuncs, cancel)
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return c
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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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defer func() {
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for _, cancel := range ctx.cancelFuncs {
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cancel()
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}
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}()
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if ctx.tracingSpan != nil {
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ctx.tracingSpan.Finish()
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}
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err := ctx.Host.Close()
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if err != nil && !rpcutil.IsBenignCloseErr(err) {
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return err
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}
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return nil
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}
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// WithCancelChannel registers a close channel which will close the returned Context when
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// the channel is closed.
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//
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// WARNING: Calling this function without ever closing `c` will leak go routines.
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func (ctx *Context) WithCancelChannel(c <-chan struct{}) *Context {
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copy := *ctx
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go func() {
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select {
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case _, _ = <-c:
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copy.Close()
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}
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}()
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return ©
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}
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