use AddError everywhere (#2372)

plugins/inputs/httpjson/httpjson.go

@@ -1,7 +1,6 @@
 package httpjson
 
 import (
-	"errors"
 	"fmt"
 	"io/ioutil"
 	"net/http"
@@ -145,31 +144,17 @@ func (h *HttpJson) Gather(acc telegraf.Accumulator) error {
 		h.client.SetHTTPClient(client)
 	}
 
-	errorChannel := make(chan error, len(h.Servers))
-
 	for _, server := range h.Servers {
 		wg.Add(1)
 		go func(server string) {
 			defer wg.Done()
-			if err := h.gatherServer(acc, server); err != nil {
-				errorChannel <- err
-			}
+			acc.AddError(h.gatherServer(acc, server))
 		}(server)
 	}
 
 	wg.Wait()
-	close(errorChannel)
 
-	// Get all errors and return them as one giant error
-	errorStrings := []string{}
-	for err := range errorChannel {
-		errorStrings = append(errorStrings, err.Error())
-	}
-
-	if len(errorStrings) == 0 {
-		return nil
-	}
-	return errors.New(strings.Join(errorStrings, "\n"))
+	return nil
 }
 
 // Gathers data from a particular server

plugins/inputs/httpjson/httpjson_test.go

@@ -210,7 +210,7 @@ func TestHttpJson200(t *testing.T) {
 
 	for _, service := range httpjson {
 		var acc testutil.Accumulator
-		err := service.Gather(&acc)
+		err := acc.GatherError(service.Gather)
 		require.NoError(t, err)
 		assert.Equal(t, 12, acc.NFields())
 		// Set responsetime
@@ -245,7 +245,7 @@ func TestHttpJsonGET_URL(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	err := a.Gather(&acc)
+	err := acc.GatherError(a.Gather)
 	require.NoError(t, err)
 
 	// remove response_time from gathered fields because it's non-deterministic
@@ -318,7 +318,7 @@ func TestHttpJsonGET(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	err := a.Gather(&acc)
+	err := acc.GatherError(a.Gather)
 	require.NoError(t, err)
 
 	// remove response_time from gathered fields because it's non-deterministic
@@ -392,7 +392,7 @@ func TestHttpJsonPOST(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	err := a.Gather(&acc)
+	err := acc.GatherError(a.Gather)
 	require.NoError(t, err)
 
 	// remove response_time from gathered fields because it's non-deterministic
@@ -448,9 +448,9 @@ func TestHttpJson500(t *testing.T) {
 	httpjson := genMockHttpJson(validJSON, 500)
 
 	var acc testutil.Accumulator
-	err := httpjson[0].Gather(&acc)
+	err := acc.GatherError(httpjson[0].Gather)
 
-	assert.NotNil(t, err)
+	assert.Error(t, err)
 	assert.Equal(t, 0, acc.NFields())
 }
 
@@ -460,9 +460,9 @@ func TestHttpJsonBadMethod(t *testing.T) {
 	httpjson[0].Method = "NOT_A_REAL_METHOD"
 
 	var acc testutil.Accumulator
-	err := httpjson[0].Gather(&acc)
+	err := acc.GatherError(httpjson[0].Gather)
 
-	assert.NotNil(t, err)
+	assert.Error(t, err)
 	assert.Equal(t, 0, acc.NFields())
 }
 
@@ -471,9 +471,9 @@ func TestHttpJsonBadJson(t *testing.T) {
 	httpjson := genMockHttpJson(invalidJSON, 200)
 
 	var acc testutil.Accumulator
-	err := httpjson[0].Gather(&acc)
+	err := acc.GatherError(httpjson[0].Gather)
 
-	assert.NotNil(t, err)
+	assert.Error(t, err)
 	assert.Equal(t, 0, acc.NFields())
 }
 
@@ -482,9 +482,9 @@ func TestHttpJsonEmptyResponse(t *testing.T) {
 	httpjson := genMockHttpJson(empty, 200)
 
 	var acc testutil.Accumulator
-	err := httpjson[0].Gather(&acc)
+	err := acc.GatherError(httpjson[0].Gather)
 
-	assert.NotNil(t, err)
+	assert.Error(t, err)
 	assert.Equal(t, 0, acc.NFields())
 }
 
@@ -495,7 +495,7 @@ func TestHttpJson200Tags(t *testing.T) {
 	for _, service := range httpjson {
 		if service.Name == "other_webapp" {
 			var acc testutil.Accumulator
-			err := service.Gather(&acc)
+			err := acc.GatherError(service.Gather)
 			// Set responsetime
 			for _, p := range acc.Metrics {
 				p.Fields["response_time"] = 1.0
@@ -533,7 +533,7 @@ func TestHttpJsonArray200Tags(t *testing.T) {
 	for _, service := range httpjson {
 		if service.Name == "other_webapp" {
 			var acc testutil.Accumulator
-			err := service.Gather(&acc)
+			err := acc.GatherError(service.Gather)
 			// Set responsetime
 			for _, p := range acc.Metrics {
 				p.Fields["response_time"] = 1.0