Reorganize code into server/{api,grpc,shared} packages (#337)

* move api code to server/api
* move grpc server for agent communication to server/grpc
* move server.Config to server/config.go as it is used by both server/api and server/grpc
* move shared code used by server/api and server/grpc to server/shared

server/api/debug/debug.go

@@ -0,0 +1,84 @@
+// Copyright 2018 Drone.IO Inc.
+//
+// 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 debug
+
+import (
+	"net/http/pprof"
+
+	"github.com/gin-gonic/gin"
+)
+
+// IndexHandler will pass the call from /debug/pprof to pprof
+func IndexHandler() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		pprof.Index(c.Writer, c.Request)
+	}
+}
+
+// HeapHandler will pass the call from /debug/pprof/heap to pprof
+func HeapHandler() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		pprof.Handler("heap").ServeHTTP(c.Writer, c.Request)
+	}
+}
+
+// GoroutineHandler will pass the call from /debug/pprof/goroutine to pprof
+func GoroutineHandler() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		pprof.Handler("goroutine").ServeHTTP(c.Writer, c.Request)
+	}
+}
+
+// BlockHandler will pass the call from /debug/pprof/block to pprof
+func BlockHandler() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		pprof.Handler("block").ServeHTTP(c.Writer, c.Request)
+	}
+}
+
+// ThreadCreateHandler will pass the call from /debug/pprof/threadcreate to pprof
+func ThreadCreateHandler() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		pprof.Handler("threadcreate").ServeHTTP(c.Writer, c.Request)
+	}
+}
+
+// CmdlineHandler will pass the call from /debug/pprof/cmdline to pprof
+func CmdlineHandler() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		pprof.Cmdline(c.Writer, c.Request)
+	}
+}
+
+// ProfileHandler will pass the call from /debug/pprof/profile to pprof
+func ProfileHandler() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		pprof.Profile(c.Writer, c.Request)
+	}
+}
+
+// SymbolHandler will pass the call from /debug/pprof/symbol to pprof
+func SymbolHandler() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		pprof.Symbol(c.Writer, c.Request)
+	}
+}
+
+// TraceHandler will pass the call from /debug/pprof/trace to pprof
+func TraceHandler() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		pprof.Trace(c.Writer, c.Request)
+	}
+}