src: move version metadata into node_metadata{.h, .cc}

This patch moves the computation of version metadata from node.cc
into node_metadata{.h, .cc}, and creates a macro that can be
used to iterate over the available version keys (v8, uv, .etc).
This makes the code clearer as now we no longer need to add
all the headers in node.cc just to compute the versions, and
makes it easier to reuse the version definitions.

PR-URL: https://github.com/nodejs/node/pull/24774
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

1 files changed, 57 insertions, 0 deletions

diff --git a/src/node_metadata.h b/src/node_metadata.h
new file mode 100644
index 0000000000..0f32fcf21d
--- /dev/null
+++ b/src/node_metadata.h
@@ -0,0 +1,57 @@
+#ifndef SRC_NODE_METADATA_H_
+#define SRC_NODE_METADATA_H_
+
+#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
+#include <string>
+
+namespace node {
+
+#define NODE_VERSIONS_KEYS_BASE(V)                                             \
+  V(node)                                                                      \
+  V(v8)                                                                        \
+  V(uv)                                                                        \
+  V(zlib)                                                                      \
+  V(ares)                                                                      \
+  V(modules)                                                                   \
+  V(nghttp2)                                                                   \
+  V(napi)
+
+#ifdef NODE_EXPERIMENTAL_HTTP
+#define NODE_VERSIONS_KEY_HTTP(V) V(llhttp)
+#else /* !NODE_EXPERIMENTAL_HTTP */
+#define NODE_VERSIONS_KEY_HTTP(V) V(http_parser)
+#endif /* NODE_EXPERIMENTAL_HTTP */
+
+#if HAVE_OPENSSL
+#define NODE_VERSIONS_KEY_CRYPTO(V) V(openssl)
+#else
+#define NODE_VERSIONS_KEY_CRYPTO(V)
+#endif
+
+#define NODE_VERSIONS_KEYS(V)                                                  \
+  NODE_VERSIONS_KEYS_BASE(V)                                                   \
+  NODE_VERSIONS_KEY_HTTP(V)                                                    \
+  NODE_VERSIONS_KEY_CRYPTO(V)
+
+class Metadata {
+ public:
+  struct Versions {
+    Versions();
+#define V(key) std::string key;
+    NODE_VERSIONS_KEYS(V)
+#undef V
+  };
+
+  Versions versions;
+};
+
+// Per-process global
+namespace per_process {
+extern Metadata metadata;
+}
+
+}  // namespace node
+
+#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+#endif  // SRC_NODE_METADATA_H_