59 lines
1.7 KiB
Go
59 lines
1.7 KiB
Go
// Copyright 2016-2017, Pulumi Corporation. All rights reserved.
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package provider
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import (
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"flag"
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"fmt"
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"github.com/pkg/errors"
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"github.com/pulumi/pulumi-fabric/pkg/util/cmdutil"
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"github.com/pulumi/pulumi-fabric/pkg/util/rpcutil"
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lumirpc "github.com/pulumi/pulumi-fabric/sdk/proto/go"
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"google.golang.org/grpc"
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)
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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(provMaker func(*HostClient) (lumirpc.ResourceProviderServer, error)) error {
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// Initialize loggers before going any further.
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cmdutil.InitLogging(false, 0, false)
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// Read the non-flags args and connect to the engine.
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flag.Parse()
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args := flag.Args()
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if len(args) == 0 {
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return errors.New("fatal: could not connect to host RPC; missing argument")
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}
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host, err := NewHostClient(args[0])
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if err != nil {
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return errors.Errorf("fatal: could not connect to host RPC: %v", err)
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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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port, done, err := rpcutil.Serve(0, nil, []func(*grpc.Server) error{
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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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lumirpc.RegisterResourceProviderServer(srv, prov)
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return nil
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},
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})
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if err != nil {
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return errors.Errorf("fatal: %v", 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", port)
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// Finally, wait for the server to stop serving.
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if err := <-done; err != nil {
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return errors.Errorf("fatal: %v", err)
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}
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return nil
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}
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