[server/kit] Adding log "format" functions that mimic appengine/log (…

…#229)

* tidying up example deps

* adding log*f funcs for the kit server

* variable firx

* adding more test logging

* DRY-ing things up a tad

server/kit/kitserver_test.go

@@ -155,7 +155,10 @@ func (s *server) Middleware(e endpoint.Endpoint) endpoint.Endpoint {
 		res, err := e(ctx, r)
 		if err != nil {
 			kit.LogWarning(ctx, "error found in middleware")
+			kit.LogWarningf(ctx, "error found in middleware: %v", err)
 			kit.LogErrorMsg(ctx, err, "the actual error")
+			kit.LogErrorf(ctx, "the actual error: %v", err)
+			kit.LogDebugf(ctx, "debug: error in middleware: %v", err)
 		}
 		return res, err
 	})
@@ -223,6 +226,7 @@ var testCat = &Cat{Breed: "American Shorthair", Name: "Ziggy", Age: 12}
 // shared business layer
 func (s *server) getCatByName(ctx context.Context, _ interface{}) (interface{}, error) {
 	kit.Logger(ctx).Log("message", "getting ziggy")
+	kit.Logf(ctx, "responding with ziggy: %#v", testCat)
 	return testCat, nil
 }
 

server/kit/log.go

@@ -2,6 +2,7 @@ package kit
 
 import (
 	"context"
+	"fmt"
 	"os"
 
 	"github.com/NYTimes/gizmo/observe"
@@ -104,23 +105,58 @@ func LogMsg(ctx context.Context, message string) error {
 	return level.Info(Logger(ctx)).Log("message", message)
 }
 
+// Logf will format the given string with the arguments then log to the server logger
+// with the key "message" along with all the common request headers or gRPC metadata.
+// Arguments are handlered in the manner of fmt.Printf.
+// This message will have an "info" log level associated with it.
+func Logf(ctx context.Context, format string, v ...interface{}) error {
+	return LogMsg(ctx, fmt.Sprintf(format, v...))
+}
+
 // LogDebug will log the given message to the server logger
 // with the key "message" along with all the common request headers or gRPC metadata.
 // This message will have a "debug" log level associated with it.
 func LogDebug(ctx context.Context, message string) error {
 	return level.Debug(Logger(ctx)).Log("message", message)
 }
 
+// LogDebugf will format the given string with the arguments then log to the server
+// logger with the key "message" along with all the common request headers or gRPC
+// metadata.
+// Arguments are handlered in the manner of fmt.Printf.
+// This message will have a "debug" log level associated with it.
+func LogDebugf(ctx context.Context, format string, v ...interface{}) error {
+	return LogDebug(ctx, fmt.Sprintf(format, v...))
+}
+
 // LogWarning will log the given message to the server logger
 // with the key "message" along with all the common request headers or gRPC metadata.
 // This message will have a "warn" log level associated with it.
 func LogWarning(ctx context.Context, message string) error {
 	return level.Warn(Logger(ctx)).Log("message", message)
 }
 
+// LogWarningf will the format given string with the arguments then log to the server
+// logger with the key "message" along with all the common request headers or gRPC
+// metadata.
+// Arguments are handlered in the manner of fmt.Printf.
+// This message will have a "warn" log level associated with it.
+func LogWarningf(ctx context.Context, format string, v ...interface{}) error {
+	return LogWarning(ctx, fmt.Sprintf(format, v...))
+}
+
 // LogErrorMsg will log the given error under the key "error", the given message under
 // the key "message" along with all the common request headers or gRPC metadata.
 // This message will have an "error" log level associated with it.
 func LogErrorMsg(ctx context.Context, err error, message string) error {
 	return level.Error(Logger(ctx)).Log("error", err, "message", message)
 }
+
+// LogErrorf will format the given string with the arguments then log to the server
+// logger with the key "message" along with all the common request headers or gRPC
+// metadata.
+// Arguments are handlered in the manner of fmt.Printf.
+// This message will have a "warn" log level associated with it.
+func LogErrorf(ctx context.Context, format string, v ...interface{}) error {
+	return level.Error(Logger(ctx)).Log("message", fmt.Sprintf(format, v...))
+}