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main.go
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main.go
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// Copyright 2016-2018, Pulumi Corporation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package provider
import (
"flag"
"fmt"
"github.com/pkg/errors"
"google.golang.org/grpc"
"github.com/pulumi/pulumi/pkg/util/cmdutil"
"github.com/pulumi/pulumi/pkg/util/logging"
"github.com/pulumi/pulumi/pkg/util/rpcutil"
pulumirpc "github.com/pulumi/pulumi/sdk/proto/go"
)
// Tracing is the optional command line flag passed to this provider for configuring a Zipkin-compatible tracing
// endpoint
var tracing string
// Main is the typical entrypoint for a resource provider plugin. Using it isn't required but can cut down
// significantly on the amount of boilerplate necessary to fire up a new resource provider.
func Main(name string, provMaker func(*HostClient) (pulumirpc.ResourceProviderServer, error)) error {
flag.StringVar(&tracing, "tracing", "", "Emit tracing to a Zipkin-compatible tracing endpoint")
flag.Parse()
// Initialize loggers before going any further.
logging.InitLogging(false, 0, false)
cmdutil.InitTracing(name, name, tracing)
// Read the non-flags args and connect to the engine.
args := flag.Args()
if len(args) == 0 {
return errors.New("fatal: could not connect to host RPC; missing argument")
}
host, err := NewHostClient(args[0])
if err != nil {
return errors.Errorf("fatal: could not connect to host RPC: %v", err)
}
// Fire up a gRPC server, letting the kernel choose a free port for us.
port, done, err := rpcutil.Serve(0, nil, []func(*grpc.Server) error{
func(srv *grpc.Server) error {
prov, proverr := provMaker(host)
if proverr != nil {
return fmt.Errorf("failed to create resource provider: %v", proverr)
}
pulumirpc.RegisterResourceProviderServer(srv, prov)
return nil
},
})
if err != nil {
return errors.Errorf("fatal: %v", err)
}
// The resource provider protocol requires that we now write out the port we have chosen to listen on.
fmt.Printf("%d\n", port)
// Finally, wait for the server to stop serving.
if err := <-done; err != nil {
return errors.Errorf("fatal: %v", err)
}
return nil
}