mirror of https://github.com/pulumi/pulumi.git
102 lines
3.3 KiB
Go
102 lines
3.3 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 provider
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import (
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"context"
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"errors"
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"flag"
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"fmt"
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"time"
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"google.golang.org/grpc"
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"github.com/pulumi/pulumi/sdk/v3/go/common/util/cmdutil"
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"github.com/pulumi/pulumi/sdk/v3/go/common/util/logging"
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"github.com/pulumi/pulumi/sdk/v3/go/common/util/rpcutil"
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pulumirpc "github.com/pulumi/pulumi/sdk/v3/proto/go"
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)
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// Tracing is the optional command line flag passed to this provider for configuring a Zipkin-compatible tracing
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// endpoint
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var tracing string
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// Main is the typical entrypoint for a resource provider plugin. Using it isn't required but can cut down
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// significantly on the amount of boilerplate necessary to fire up a new resource provider.
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func Main(name string, provMaker func(*HostClient) (pulumirpc.ResourceProviderServer, error)) error {
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flag.StringVar(&tracing, "tracing", "", "Emit tracing to a Zipkin-compatible tracing endpoint")
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flag.Parse()
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// Initialize loggers before going any further.
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logging.InitLogging(false, 0, false)
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cmdutil.InitTracing(name, name, tracing)
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// Read the non-flags args and connect to the engine.
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var cancelChannel chan bool
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args := flag.Args()
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var host *HostClient
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if len(args) == 0 {
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// Start the provider in Attach mode
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} else if len(args) == 1 {
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var err error
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host, err = NewHostClient(args[0])
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if err != nil {
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return fmt.Errorf("fatal: could not connect to host RPC: %w", err)
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}
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// If we have a host cancel our cancellation context if it fails the healthcheck
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ctx, cancel := context.WithCancel(context.Background())
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// map the context Done channel to the rpcutil boolean cancel channel
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cancelChannel = make(chan bool)
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go func() {
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<-ctx.Done()
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close(cancelChannel)
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}()
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err = rpcutil.Healthcheck(ctx, args[0], 5*time.Minute, cancel)
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if err != nil {
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return fmt.Errorf("could not start health check host RPC server: %w", err)
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}
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} else {
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return errors.New("fatal: could not connect to host RPC; missing argument")
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}
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// Fire up a gRPC server, letting the kernel choose a free port for us.
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handle, err := rpcutil.ServeWithOptions(rpcutil.ServeOptions{
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Cancel: cancelChannel,
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Init: func(srv *grpc.Server) error {
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prov, proverr := provMaker(host)
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if proverr != nil {
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return fmt.Errorf("failed to create resource provider: %v", proverr)
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}
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pulumirpc.RegisterResourceProviderServer(srv, prov)
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return nil
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},
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Options: rpcutil.OpenTracingServerInterceptorOptions(nil),
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})
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if err != nil {
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return fmt.Errorf("fatal: %w", err)
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}
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// The resource provider protocol requires that we now write out the port we have chosen to listen on.
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fmt.Printf("%d\n", handle.Port)
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// Finally, wait for the server to stop serving.
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if err := <-handle.Done; err != nil {
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return fmt.Errorf("fatal: %w", err)
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}
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return nil
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}
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