Merge pull request #14 from ahdekkers/main

Wait on gRPC readiness (#10)

README.md

@@ -49,6 +49,10 @@ Feel free to choose from any of the other releases though.
 $ wait-for http://your-service-here:8080/health https://another-service/
 ``` 
 
+### Waiting for gRPC services
+```shell script
+$ wait-for grpc-server:8092 other-grpc-server:9091
+```
 
 ### Preconfiguring services to connect to
 
@@ -71,6 +75,9 @@ wait-for:
   another-service:
     type: http
     target: https://another-one
+  grpcService:
+    type: grpc
+    target: localhost:9092
   snmp-service:
     type: tcp
     target: snmp-trap-dns:514

go.mod

@@ -6,8 +6,10 @@ require (
 	github.com/cucumber/godog v0.10.0
 	github.com/gofrs/uuid v3.3.0+incompatible // indirect
 	github.com/hashicorp/go-memdb v1.3.0 // indirect
+	github.com/phayes/freeport v0.0.0-20220201140144-74d24b5ae9f5
 	github.com/spf13/afero v1.4.1
-	github.com/stretchr/testify v1.6.1
+	github.com/stretchr/testify v1.7.0
 	golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9
+	google.golang.org/grpc v1.46.0
 	gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776
 )

go.sum

@@ -1,4 +1,17 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
 github.com/aslakhellesoy/gox v1.0.100/go.mod h1:AJl542QsKKG96COVsv0N74HHzVQgDIQPceVUh1aeU2M=
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+github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
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+github.com/cncf/xds/go v0.0.0-20211001041855-01bcc9b48dfe/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
+github.com/cncf/xds/go v0.0.0-20211011173535-cb28da3451f1/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
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@@ -10,11 +23,44 @@ github.com/cucumber/messages-go/v10 v10.0.3/go.mod h1:9jMZ2Y8ZxjLY6TG2+x344nt5rX
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+github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
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@@ -38,35 +84,103 @@ github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
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waitfor.go

@@ -1,12 +1,15 @@
 package waitfor
 
 import (
+	"context"
 	"fmt"
+	"google.golang.org/grpc/credentials/insecure"
 	"net"
 	"net/http"
 	"time"
 
 	"golang.org/x/sync/errgroup"
+	"google.golang.org/grpc"
 
 	"github.com/spf13/afero"
 )
@@ -23,6 +26,7 @@ var NullLogger = func(f string, a ...interface{}) {}
 var SupportedWaiters = map[string]WaiterFunc{
 	"http": HTTPWaiter,
 	"tcp":  TCPWaiter,
+	"grpc": GRPCWaiter,
 }
 
 // WaitOn implements waiting for many targets, using the location of config file provided with named targets to wait until
@@ -150,6 +154,23 @@ func HTTPWaiter(name string, target *TargetConfig) error {
 	return nil
 }
 
+func GRPCWaiter(name string, target *TargetConfig) error {
+	ctx, cancel := context.WithTimeout(context.TODO(), target.Timeout)
+	defer cancel()
+
+	dialOpts := []grpc.DialOption{
+		grpc.WithTransportCredentials(insecure.NewCredentials()),
+		grpc.WithBlock(),
+	}
+	conn, err := grpc.DialContext(ctx, target.Target, dialOpts...)
+	if err != nil {
+		return fmt.Errorf("could not connect to %s: %v", name, err)
+	}
+	defer conn.Close()
+
+	return nil
+}
+
 func isSuccess(code int) bool {
 	if code < 200 {
 		return false