tests(helpers): target grpc service makefile

Add a makefile to grpc target service and simplify test helper.

spec/fixtures/grpc/Makefile

@@ -0,0 +1,20 @@
+ALL= targetservice/targetservice.pb.go targetservice/targetservice_grpc.pb.go target
+
+all: $(ALL)
+
+.PHONY: go
+
+clean:
+	rm -rf $(ALL)
+
+go:
+	go mod tidy && go mod download all
+
+target: go targetservice/targetservice.pb.go targetservice/targetservice_grpc.pb.go target.go
+	go build -o $@
+
+targetservice/targetservice.pb.go: proto/targetservice.proto
+	protoc -I proto/ --go_out=. --go-grpc_out=. proto/targetservice.proto
+
+targetservice/targetservice_grpc.pb.go: proto/targetservice.proto
+	protoc -I proto/ --go_out=. --go-grpc_out=. proto/targetservice.proto

spec/internal/grpc.lua

@@ -6,33 +6,12 @@ local resty_signal = require("resty.signal")
 local CONSTANTS = require("spec.internal.constants")
 
 
-local function isnewer(path_a, path_b)
-  if not pl_path.exists(path_a) then
-    return true
-  end
-  if not pl_path.exists(path_b) then
-    return false
-  end
-  return assert(pl_path.getmtime(path_b)) > assert(pl_path.getmtime(path_a))
-end
-
-
 local function make(workdir, specs)
   workdir = pl_path.normpath(workdir or pl_path.currentdir())
 
   for _, spec in ipairs(specs) do
-    local targetpath = pl_path.join(workdir, spec.target)
-    for _, src in ipairs(spec.src) do
-      local srcpath = pl_path.join(workdir, src)
-      if isnewer(targetpath, srcpath) then
-        local ok, _, stderr = shell.run(string.format("cd %s; %s", workdir, spec.cmd), nil, 0)
-        assert(ok, stderr)
-        if isnewer(targetpath, srcpath) then
-          error(string.format("couldn't make %q newer than %q", targetpath, srcpath))
-        end
-        break
-      end
-    end
+    local ok, _, stderr = shell.run(string.format("cd %s; %s", workdir, spec.cmd), nil, 0)
+    assert(ok, stderr)
   end
 
   return true
@@ -46,19 +25,7 @@ local function start_grpc_target()
   local ngx_pipe = require("ngx.pipe")
   assert(make(CONSTANTS.GRPC_TARGET_SRC_PATH, {
     {
-      target = "targetservice/targetservice.pb.go",
-      src    = { "../targetservice.proto" },
-      cmd    = "protoc --go_out=. --go-grpc_out=. -I ../ ../targetservice.proto",
-    },
-    {
-      target = "targetservice/targetservice_grpc.pb.go",
-      src    = { "../targetservice.proto" },
-      cmd    = "protoc --go_out=. --go-grpc_out=. -I ../ ../targetservice.proto",
-    },
-    {
-      target = "target",
-      src    = { "grpc-target.go", "targetservice/targetservice.pb.go", "targetservice/targetservice_grpc.pb.go" },
-      cmd    = "go mod tidy && go mod download all && go build",
+      cmd    = "make clean && make all",
     },
   }))
   grpc_target_proc = assert(ngx_pipe.spawn({ CONSTANTS.GRPC_TARGET_SRC_PATH .. "/target" }, {