command: when generating envoy bootstrap configs to stdout do not mix informational logs into the json (#9980)

Fixes #9921

.changelog/9980.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+command: when generating envoy bootstrap configs to stdout do not mix informational logs into the json
+```

command/connect/envoy/envoy.go

@@ -4,7 +4,6 @@ import (
 	"errors"
 	"flag"
 	"fmt"
-	"io"
 	"net"
 	"os"
 	"os/exec"
@@ -24,17 +23,7 @@ import (
 )
 
 func New(ui cli.Ui) *cmd {
-	ui = &cli.PrefixedUi{
+	c := &cmd{UI: ui}
-		OutputPrefix: "==> ",
-		InfoPrefix:   "    ",
-		ErrorPrefix:  "==> ",
-		Ui:           ui,
-	}
-
-	c := &cmd{
-		UI:        ui,
-		directOut: os.Stdout,
-	}
 	c.init()
 	return c
 }
@@ -47,9 +36,6 @@ type cmd struct {
 	http   *flags.HTTPFlags
 	help   string
 	client *api.Client
-	// DirectOut defaults to os.stdout but is a property to allow capture during
-	// tests to have more useful output.
-	directOut io.Writer
 
 	// flags
 	meshGateway           bool
@@ -380,7 +366,11 @@ func (c *cmd) run(args []string) int {
 			return 1
 		}
 
-		c.UI.Output(fmt.Sprintf("Registered service: %s", svc.Name))
+		if !c.bootstrap {
+			// We need stdout to be reserved exclusively for the JSON blob, so
+			// we omit logging this to Info which also writes to stdout.
+			c.UI.Info(fmt.Sprintf("Registered service: %s", svc.Name))
+		}
 	}
 
 	// Generate config
@@ -392,7 +382,7 @@ func (c *cmd) run(args []string) int {
 
 	if c.bootstrap {
 		// Just output it and we are done
-		c.directOut.Write(bootstrapJson)
+		c.UI.Output(string(bootstrapJson))
 		return 0
 	}
 
@@ -578,7 +568,6 @@ func (c *cmd) grpcAddress(httpCfg *api.Config) (GRPC, error) {
 			// This is the dev mode default and recommended production setting if
 			// enabled.
 			port = 8502
-			c.UI.Info(fmt.Sprintf("Defaulting to grpc port = %d", port))
 		}
 		addr = fmt.Sprintf("localhost:%v", port)
 	}

command/connect/envoy/envoy_test.go

@@ -1,7 +1,6 @@
 package envoy
 
 import (
-	"bytes"
 	"encoding/json"
 	"flag"
 	"io/ioutil"
@@ -15,12 +14,13 @@ import (
 
 	"github.com/stretchr/testify/assert"
 
+	"github.com/mitchellh/cli"
+	"github.com/stretchr/testify/require"
+
 	"github.com/hashicorp/consul/agent"
 	"github.com/hashicorp/consul/agent/xds"
 	"github.com/hashicorp/consul/api"
 	"github.com/hashicorp/consul/sdk/testutil"
-	"github.com/mitchellh/cli"
-	"github.com/stretchr/testify/require"
 )
 
 var update = flag.Bool("update", false, "update golden files")
@@ -874,11 +874,6 @@ func TestGenerateConfig(t *testing.T) {
 			// explicitly set the client to one which can connect to the httptest.Server
 			c.client = client
 
-			var outBuf bytes.Buffer
-			// Capture output since it clutters test output and we can assert on what
-			// was actually printed this way.
-			c.directOut = &outBuf
-
 			// Run the command
 			myFlags := copyAndReplaceAll(tc.Flags, "@@TEMPDIR@@", testDirPrefix)
 			args := append([]string{"-bootstrap"}, myFlags...)
@@ -899,7 +894,7 @@ func TestGenerateConfig(t *testing.T) {
 			require.NoError(err) // Error cases should have returned above
 			require.Equal(&tc.WantArgs, got)
 
-			actual := outBuf.Bytes()
+			actual := ui.OutputWriter.Bytes()
 
 			// If we got the arg handling write, verify output
 			golden := filepath.Join("testdata", tc.Name+".golden")

command/connect/envoy/testdata/CONSUL_HTTP_ADDR-with-https-scheme-enables-tls.golden

@@ -190,3 +190,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/access-log-path.golden

@@ -177,3 +177,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/defaults.golden

@@ -177,3 +177,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/existing-ca-file.golden

@@ -190,3 +190,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/existing-ca-path.golden

@@ -190,3 +190,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/extra_-multiple.golden

@@ -199,3 +199,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/extra_-single.golden

@@ -190,3 +190,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/grpc-addr-config.golden

@@ -177,3 +177,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/grpc-addr-env.golden

@@ -177,3 +177,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/grpc-addr-flag.golden

@@ -177,3 +177,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/grpc-addr-unix.golden

@@ -176,3 +176,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/ingress-gateway-address-specified.golden

@@ -263,3 +263,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/ingress-gateway-no-auto-register.golden

@@ -263,3 +263,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/ingress-gateway-register-with-service-and-proxy-id.golden

@@ -263,3 +263,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/ingress-gateway-register-with-service-without-proxy-id.golden

@@ -263,3 +263,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/ingress-gateway.golden

@@ -263,3 +263,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/prometheus-metrics.golden

@@ -263,3 +263,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/stats-config-override.golden

@@ -75,3 +75,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/token-arg.golden

@@ -177,3 +177,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/token-env.golden

@@ -177,3 +177,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/token-file-arg.golden

@@ -177,3 +177,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/token-file-env.golden

@@ -177,3 +177,4 @@
     }
   }
 }
+

command/connect/envoy/testdata/zipkin-tracing-config.golden

@@ -210,3 +210,4 @@
     }
   }
 }
+