wcfs: client: Adjust to be forward-compatible with upcoming pygolang changes

Don't use golang::* namespaces to avoid clashes with pygolang adding
something in there and getting compilation error due to conflict, when
e.g. nexedi/pygolang!17 lands.

-> use xgolang:: as top-level namespace for what was previously living
in golang:: shipped in wendelin.core.

Inside that xgolang:: namespace don't use the same package names that
might be used inside golang:: in pygolang. This avoids ambiguation and
compile error in the future on e.g. os::AfterFork - is `using namespace
golang` and `using namespace xgolang` were both activated.

-> Prefix all namespaces inside xgolang:: also with "x".

bigfile/file_zodb.cpp

-// Copyright (C) 2019-2021  Nexedi SA and Contributors.
+// Copyright (C) 2019-2022  Nexedi SA and Contributors.
 //                          Kirill Smelkov <kirr@nexedi.com>
 //
 // This program is free software: you can Use, Study, Modify and Redistribute
@@ -27,6 +27,8 @@
 #include "bigfile/_file_zodb.h"
 #include <ccan/container_of/container_of.h>
 
+using namespace xgolang;
+
 static int zfile_mmap_setup_read(VMA *vma, BigFile *file, blk_t blk, size_t blklen) {
     _ZBigFile* _zfile = container_of(file, _ZBigFile, __pyx_base.file);
 
@@ -39,7 +41,7 @@ static int zfile_mmap_setup_read(VMA *vma, BigFile *file, blk_t blk, size_t blkl
 
     tie(mmap, err) = fileh->mmap(blk, blklen, vma);
     if (err != nil) {
-        log::Errorf("%s", v(err)); // XXX no way to return error details to virtmem
+        xlog::Errorf("%s", v(err)); // XXX no way to return error details to virtmem
         return -1;
     }
 
@@ -56,7 +58,7 @@ static int zfile_remmap_blk_read(VMA *vma, BigFile *file, blk_t blk) {
     error err;
     err = mmap->remmap_blk(blk);
     if (err != nil) {
-        log::Errorf("%s", v(err)); // XXX no way to return error details to virtmem
+        xlog::Errorf("%s", v(err)); // XXX no way to return error details to virtmem
         return -1;
     }
 
@@ -74,7 +76,7 @@ static int zfile_munmap(VMA *vma, BigFile *file) {
     error err;
     err = mmap->unmap();
     if (err != nil) {
-        log::Errorf("%s", v(err)); // XXX no way to return error details to virtmem
+        xlog::Errorf("%s", v(err)); // XXX no way to return error details to virtmem
         return -1;
     }
 

wcfs/client/wcfs.cpp

@@ -229,7 +229,7 @@ using std::min;
 using std::max;
 using std::vector;
 
-namespace ioutil = io::ioutil;
+namespace ioutil = xgolang::io::ioutil;
 
 
 #define TRACE 0

wcfs/client/wcfs.h

-// Copyright (C) 2018-2021  Nexedi SA and Contributors.
+// Copyright (C) 2018-2022  Nexedi SA and Contributors.
 //                          Kirill Smelkov <kirr@nexedi.com>
 //
 // This program is free software: you can Use, Study, Modify and Redistribute
@@ -118,6 +118,10 @@ struct VMA;
 namespace wcfs {
 
 using namespace golang;
+namespace os        = xgolang::xos;
+namespace mm        = xgolang::xmm;
+namespace xstrconv  = xgolang::xstrconv;
+namespace log       = xgolang::xlog;
 using cxx::dict;
 using cxx::set;
 using std::tuple;

wcfs/client/wcfs_misc.cpp

@@ -36,11 +36,13 @@ using namespace golang;
 #include <algorithm>
 #include <memory>
 
-// golang::
-namespace golang {
+// xgolang::
+namespace xgolang {
 
-// os::
-namespace os {
+// xos::
+namespace xos {
+
+namespace io = golang::io;
 
 global<error> ErrClosed = errors::New("file already closed");
 
@@ -196,16 +198,16 @@ static string _sysErrString(int syserr) {
     return string(estr);
 }
 
-}   // os::
+}   // xos::
 
 
-// mm::
-namespace mm {
+// xmm::
+namespace xmm {
 
 // map memory-maps f.fd[offset +size) somewhere into memory.
 // prot  is PROT_* from mmap(2).
 // flags is MAP_*  from mmap(2); MAP_FIXED must not be used.
-tuple<uint8_t*, error> map(int prot, int flags, os::File f, off_t offset, size_t size) {
+tuple<uint8_t*, error> map(int prot, int flags, xos::File f, off_t offset, size_t size) {
     void *addr;
 
     if (flags & MAP_FIXED)
@@ -213,7 +215,7 @@ tuple<uint8_t*, error> map(int prot, int flags, os::File f, off_t offset, size_t
 
     addr = ::mmap(nil, size, prot, flags, f->_sysfd(), offset);
     if (addr == MAP_FAILED)
-        return make_tuple(nil, os::_pathError("mmap", f->Name(), errno));
+        return make_tuple(nil, xos::_pathError("mmap", f->Name(), errno));
 
     return make_tuple((uint8_t*)addr, nil);
 }
@@ -221,12 +223,12 @@ tuple<uint8_t*, error> map(int prot, int flags, os::File f, off_t offset, size_t
 // map_into memory-maps f.fd[offset +size) into [addr +size).
 // prot  is PROT_* from mmap(2).
 // flags is MAP_*  from mmap(2); MAP_FIXED is added automatically.
-error map_into(void *addr, size_t size, int prot, int flags, os::File f, off_t offset) {
+error map_into(void *addr, size_t size, int prot, int flags, xos::File f, off_t offset) {
     void *addr2;
 
     addr2 = ::mmap(addr, size, prot, MAP_FIXED | flags, f->_sysfd(), offset);
     if (addr2 == MAP_FAILED)
-        return os::_pathError("mmap", f->Name(), errno);
+        return xos::_pathError("mmap", f->Name(), errno);
     if (addr2 != addr)
         panic("mmap(addr, MAP_FIXED): returned !addr");
     return nil;
@@ -236,11 +238,11 @@ error map_into(void *addr, size_t size, int prot, int flags, os::File f, off_t o
 error unmap(void *addr, size_t size) {
     int err = ::munmap(addr, size);
     if (err != 0)
-        return os::_pathError("munmap", "<memory>", errno);
+        return xos::_pathError("munmap", "<memory>", errno);
     return nil;
 }
 
-}   // mm::
+}   // xmm::
 
 
 // io::ioutil::
@@ -249,10 +251,10 @@ namespace ioutil {
 
 tuple<string, error> ReadFile(const string& path) {
     // errctx is ok as returned by all calls.
-    os::File f;
-    error    err;
+    xos::File f;
+    error     err;
 
-    tie(f, err) = os::Open(path);
+    tie(f, err) = xos::Open(path);
     if (err != nil)
         return make_tuple("", err);
 
@@ -264,7 +266,7 @@ tuple<string, error> ReadFile(const string& path) {
         tie(n, err) = f->Read(&buf[0], buf.size());
         data.append(&buf[0], n);
         if (err != nil) {
-            if (err == io::EOF_)
+            if (err == golang::io::EOF_)
                 err = nil;
             break;
         }
@@ -318,7 +320,7 @@ tuple<uint64_t, error> parseUint(const string& s) {
 }   // xstrconv::
 
 
-}   // golang::
+}   // xgolang::
 
 
 // xerr::
@@ -354,9 +356,9 @@ error Contextf::operator() (error err) const {
 #include <sys/types.h>
 #include <sys/syscall.h>
 
-// golang::log::
-namespace golang {
-namespace log {
+// xgolang::xlog::
+namespace xgolang {
+namespace xlog {
 
 void __Logf(const char *file, int line, char level, const char *format, ...) {
     double t = time::now();
@@ -385,7 +387,7 @@ void __Logf(const char *file, int line, char level, const char *format, ...) {
     funlockfile(stderr);
 }
 
-}}  // golang::log::
+}}  // xgolang::xlog::
 
 
 // wcfs::

wcfs/client/wcfs_misc.h

@@ -55,11 +55,11 @@ using std::vector;
 #include <sys/stat.h>
 #include <fcntl.h>
 
-// golang::
-namespace golang {
+// xgolang::
+namespace xgolang {
 
-// os::
-namespace os {
+// xos::
+namespace xos {
 
 extern global<error> ErrClosed;
 
@@ -126,15 +126,15 @@ void RegisterAfterFork(IAfterFork obj);
 // It is noop if obj was not registered.
 void UnregisterAfterFork(IAfterFork obj);
 
-}   // os::
+}   // xos::
 
-// mm::
-namespace mm {
-    tuple<uint8_t*, error> map(int prot, int flags, os::File f, off_t offset, size_t size);
-    error map_into(void *addr, size_t size, int prot, int flags, os::File f, off_t offset);
+// xmm::
+namespace xmm {
+    tuple<uint8_t*, error> map(int prot, int flags, xos::File f, off_t offset, size_t size);
+    error map_into(void *addr, size_t size, int prot, int flags, xos::File f, off_t offset);
     error unmap(void *addr, size_t size);
 
-}   // mm::
+}   // xmm::
 
 
 // io::ioutil::
@@ -157,8 +157,8 @@ tuple<uint64_t, error> parseUint(const string& s);
 
 }   // xstrconv::
 
-// log::
-namespace log {
+// xlog::
+namespace xlog {
 
 #define Debugf(format, ...) __Logf(__FILE__, __LINE__, 'D', format, ##__VA_ARGS__)
 #define Infof(format, ...)  __Logf(__FILE__, __LINE__, 'I', format, ##__VA_ARGS__)
@@ -167,9 +167,9 @@ namespace log {
 #define Fatalf(format, ...) __Logf(__FILE__, __LINE__, 'F', format, ##__VA_ARGS__)
 void __Logf(const char *file, int line, char level, const char *format, ...);
 
-}   // log::
+}   // xlog::
 
-}   // golang::
+}   // xgolang::
 
 
 // zodb::