base: add temp_file

port: rework file

ortools/base/BUILD.bazel

@@ -634,6 +634,19 @@ cc_library(
     ],
 )
 
+cc_library(
+    name = "temp_file",
+    srcs = ["temp_file.cc"],
+    hdrs = ["temp_file.h"],
+    deps = [
+        ":base",
+        ":file",
+        "@abseil-cpp//absl/status",
+        "@abseil-cpp//absl/strings",
+        "@abseil-cpp//absl/time",
+    ],
+)
+
 cc_library(
     name = "temp_path",
     srcs = ["temp_path.cc"],

ortools/base/file.h

@@ -11,8 +11,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#ifndef OR_TOOLS_BASE_FILE_H_
+// emulates g3/file/base/file.h
-#define OR_TOOLS_BASE_FILE_H_
+#ifndef ORTOOLS_BASE_FILE_H_
+#define ORTOOLS_BASE_FILE_H_
 
 #include <cstddef>
 #include <cstdint>
@@ -145,4 +146,4 @@ absl::Status SetBinaryProto(absl::string_view file_name,
 
 }  // namespace file
 
-#endif  // OR_TOOLS_BASE_FILE_H_
+#endif  // ORTOOLS_BASE_FILE_H_

ortools/base/string_view_migration.h

@@ -11,8 +11,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#ifndef THIRD_PARTY_ORTOOLS_ORTOOLS_BASE_STRING_VIEW_MIGRATION_H_
+#ifndef ORTOOLS_BASE_STRING_VIEW_MIGRATION_H_
-#define THIRD_PARTY_ORTOOLS_ORTOOLS_BASE_STRING_VIEW_MIGRATION_H_
+#define ORTOOLS_BASE_STRING_VIEW_MIGRATION_H_
 
 #include <string>
 
@@ -31,4 +31,4 @@ inline std::string StringCopy(const std::string& str) { return str; }
 
 }  // namespace google::protobuf
 
-#endif  // THIRD_PARTY_ORTOOLS_ORTOOLS_BASE_STRING_VIEW_MIGRATION_H_
+#endif  // ORTOOLS_BASE_STRING_VIEW_MIGRATION_H_

ortools/base/temp_file.cc

@@ -0,0 +1,67 @@
+// Copyright 2010-2025 Google LLC
+// 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.
+
+#include "ortools/base/temp_file.h"
+
+#include <cstdint>
+#include <string>
+
+#include "absl/status/statusor.h"
+#include "absl/strings/str_format.h"
+#include "absl/strings/string_view.h"
+#include "absl/time/clock.h"
+#include "ortools/base/logging.h"
+
+#if !defined(__PORTABLE_PLATFORM__)
+#if !defined(_MSC_VER)
+#include <unistd.h>
+#endif
+#endif  // !defined(__PORTABLE_PLATFORM__)
+
+namespace file {
+
+::absl::StatusOr<std::string> MakeTempFilename(absl::string_view directory,
+                                               absl::string_view file_prefix) {
+  std::string filename;
+#if defined(__PORTABLE_PLATFORM__)
+  filename = "Temporary files are not implemented for this platform.";
+  LOG(ERROR) << filename;
+  return absl::UnavailableError(filename);
+#endif  // !defined(__PORTABLE_PLATFORM__)
+
+#if defined(__linux__)
+  int32_t tid = static_cast<int32_t>(pthread_self());
+#else   // defined(__linux__)
+  int32_t tid = 123;
+#endif  // defined(__linux__)
+#if !defined(_MSC_VER)
+  int32_t pid = static_cast<int32_t>(getpid());
+#else   // _MSC_VER
+  int32_t pid = 456;
+#endif  // _MSC_VER
+  int64_t now = absl::GetCurrentTimeNanos();
+
+  if (directory.empty()) {
+    directory = "/tmp";
+  }
+
+  if (file_prefix.empty()) {
+    file_prefix = "tempfile";
+  }
+
+  filename = absl::StrFormat("%s/%s-%x-%d-%llx", directory, file_prefix, tid,
+                             pid, now);
+  return filename;
+}
+
+}  // namespace file

ortools/base/temp_file.h

@@ -0,0 +1,38 @@
+// Copyright 2010-2025 Google LLC
+// 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.
+
+// emulates g3/file/util/temp_file.h
+#ifndef ORTOOLS_BASE_TEMP_FILE_H_
+#define ORTOOLS_BASE_TEMP_FILE_H_
+
+#include <string>
+
+#include "absl/status/statusor.h"
+#include "absl/strings/string_view.h"
+
+namespace file {
+
+// The following functions return a temporary-looking filename.
+// Note that the pattern of the generated filenames is subject to change.
+
+// Returns a unique filename in 'directory' (which can be followed or not by a
+// "/"). Unique filenames begin with the given file_prefix followed by a unique
+// string.
+// If 'directory' is empty a local scratch directory is selected.
+// If 'file_prefix' is empty a default prefix is used.
+::absl::StatusOr<std::string> MakeTempFilename(absl::string_view directory,
+                                               absl::string_view file_prefix);
+
+}  // namespace file
+
+#endif  // ORTOOLS_BASE_TEMP_FILE_H_

ortools/base/temp_path.h

@@ -11,8 +11,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#ifndef OR_TOOLS_BASE_TEMP_PATH_H_
+// emulates g3/file/util/temp_path.h
-#define OR_TOOLS_BASE_TEMP_PATH_H_
+#ifndef ORTOOLS_BASE_TEMP_PATH_H_
+#define ORTOOLS_BASE_TEMP_PATH_H_
 
 #include <string>
 
@@ -59,4 +60,4 @@ class TempPath {
 
 namespace file {}  // namespace file
 
-#endif  // OR_TOOLS_BASE_TEMP_PATH_H_
+#endif  // ORTOOLS_BASE_TEMP_PATH_H_

ortools/port/file.cc

@@ -16,6 +16,7 @@
 #include <string>
 
 #include "absl/status/status.h"
+#include "absl/strings/string_view.h"
 #include "ortools/base/logging.h"
 
 #if !defined(__PORTABLE_PLATFORM__)
@@ -25,7 +26,6 @@
 
 #include "absl/strings/str_format.h"
 #include "absl/time/clock.h"
-#include "ortools/base/file.h"
 #include "ortools/base/helpers.h"
 #include "ortools/base/options.h"
 #endif  // !defined(__PORTABLE_PLATFORM__)
@@ -52,29 +52,6 @@ namespace operations_research {
 #endif  // !defined(__PORTABLE_PLATFORM__)
 }
 
-bool PortableTemporaryFile(const char* directory_prefix,
-                           std::string* filename_out) {
-#if defined(__PORTABLE_PLATFORM__)
-  LOG(ERROR) << "Temporary files are not implemented for this platform.";
-  return false;
-#else  // defined(__PORTABLE_PLATFORM__)
-#if defined(__linux)
-  int32_t tid = static_cast<int32_t>(pthread_self());
-#else   // defined(__linux__)
-  int32_t tid = 123;
-#endif  // defined(__linux__)
-#if !defined(_MSC_VER)
-  int32_t pid = static_cast<int32_t>(getpid());
-#else   // _MSC_VER
-  int32_t pid = 456;
-#endif  // _MSC_VER
-  int64_t now = absl::GetCurrentTimeNanos();
-  std::string filename =
-      absl::StrFormat("/tmp/parameters-tempfile-%x-%d-%llx", tid, pid, now);
-  return true;
-#endif  // !defined(__PORTABLE_PLATFORM__)
-}
-
 ::absl::Status PortableDeleteFile(absl::string_view file_name) {
 #if defined(__PORTABLE_PLATFORM__)
   return absl::Status(absl::StatusCode::kUnimplemented,

ortools/port/file.h

@@ -29,10 +29,6 @@ namespace operations_research {
 
 ::absl::Status PortableDeleteFile(absl::string_view file_name);
 
-// Returns true if successful.  Outputs temp file to filename.
-bool PortableTemporaryFile(const char* directory_prefix,
-                           std::string* filename_out);
-
 }  // namespace operations_research
 
 #endif  // OR_TOOLS_PORT_FILE_H_