// Copyright Joyent, Inc. and other Node contributors.
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// following conditions:
//
// The above copyright notice and this permission notice shall be included
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//
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#ifndef SRC_NODE_DTRACE_H_
#define SRC_NODE_DTRACE_H_

#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

#include "v8.h"

extern "C" {
/*
 * The following structures are passed directly to DTrace when probes are fired.
 * Translators in node.d translate these structures into the corresponding D
 * structures, taking care of dealing with the user process data model (32-bit
 * or 64-bit) and structure versions (see node_dtrace_http_server_request_t
 * below).
 */

typedef struct {
 int32_t fd;
 int32_t port;
 char* remote;
 int32_t buffered;
} node_dtrace_connection_t;

typedef struct {
 char* url;
 char* method;
} node_dtrace_http_client_request_t;

/*
 * The original version of this structure contained only a url and method, just
 * like the client request above. To add the new forwardedFor field, the
 * structure layout was changed to begin with an integer version. The
 * translator knows whether it's looking at an old- or new-version structure
 * based on whether the version field's value is a reasonable pointer (i.e.
 * address greater than 4K). No doubt this is filthy, but there's not much else
 * we can do, and it works reliably.
 *
 * This version of the structure also contains padding that should be zeroed out
 * by the consumer so that future versions of the translator can simply check if
 * a field is present by checking it against nullptr.
 */
typedef struct {
 union {
 uint32_t version;
 uintptr_t unused; /* for compat. with old 64-bit struct */
 } _un;
 char* url;
 char* method;
 char* forwardedFor;
 char* _pad[8];
} node_dtrace_http_server_request_t;

} // extern "C"

namespace node {

class Environment;

void InitDTrace(Environment* env);

} // namespace node

#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

#endif // SRC_NODE_DTRACE_H_