[libvirt] [PATCH] Add support for YAJL version 2 API/ABI

Version 2.0.0 or yajl changed API. It is fairly trivial for us to cope with both APIs in libvirt, so adapt. * configure.ac: Probe for yajl2 API * src/util/json.c: Conditional support for yajl2 API --- configure.ac | 8 ++++++++ src/util/json.c | 44 +++++++++++++++++++++++++++++++++++++++----- 2 files changed, 47 insertions(+), 5 deletions(-) diff --git a/configure.ac b/configure.ac index 7c68bca..dc87347 100644 --- a/configure.ac +++ b/configure.ac @@ -878,6 +878,7 @@ AC_ARG_WITH([yajl], YAJL_CFLAGS= YAJL_LIBS= +with_yajl2=no if test "x$with_yajl" != "xno"; then if test "x$with_yajl" != "xyes" && test "x$with_yajl" != "xcheck"; then YAJL_CFLAGS="-I$with_yajl/include" @@ -898,6 +899,9 @@ if test "x$with_yajl" != "xno"; then AC_CHECK_LIB([yajl], [yajl_parse],[ YAJL_LIBS="$YAJL_LIBS -lyajl" with_yajl=yes + AC_CHECK_LIB([yajl], [yajl_tree_parse],[ + with_yajl2=yes + ],[]) ],[ if test "x$with_yajl" = "xcheck" ; then with_yajl=no @@ -914,6 +918,10 @@ if test "x$with_yajl" != "xno"; then AC_DEFINE_UNQUOTED([HAVE_YAJL], 1, [whether YAJL is available for JSON parsing/formatting]) fi + if test "x$with_yajl2" = "xyes" ; then + AC_DEFINE_UNQUOTED([HAVE_YAJL2], 1, + [whether YAJL has API version 2]) + fi fi AM_CONDITIONAL([HAVE_YAJL], [test "x$with_yajl" = "xyes"]) AC_SUBST([YAJL_CFLAGS]) diff --git a/src/util/json.c b/src/util/json.c index 0daeae9..80dbca4 100644 --- a/src/util/json.c +++ b/src/util/json.c @@ -709,7 +709,12 @@ static int virJSONParserHandleBoolean(void * ctx, int boolean_) static int virJSONParserHandleNumber(void * ctx, const char * s, - unsigned int l) +#ifdef HAVE_YAJL2 + size_t l +#else + unsigned int l +#endif + ) { virJSONParserPtr parser = ctx; char *str = strndup(s, l); @@ -735,7 +740,12 @@ static int virJSONParserHandleNumber(void * ctx, static int virJSONParserHandleString(void * ctx, const unsigned char * stringVal, - unsigned int stringLen) +#ifdef HAVE_YAJL2 + size_t stringLen +#else + unsigned int stringLen +#endif + ) { virJSONParserPtr parser = ctx; virJSONValuePtr value = virJSONValueNewStringLen((const char *)stringVal, @@ -756,7 +766,12 @@ static int virJSONParserHandleString(void * ctx, static int virJSONParserHandleMapKey(void * ctx, const unsigned char * stringVal, - unsigned int stringLen) +#ifdef HAVE_YAJL2 + size_t stringLen +#else + unsigned int stringLen +#endif + ) { virJSONParserPtr parser = ctx; virJSONParserStatePtr state; @@ -894,14 +909,22 @@ static const yajl_callbacks parserCallbacks = { /* XXX add an incremental streaming parser - yajl trivially supports it */ virJSONValuePtr virJSONValueFromString(const char *jsonstring) { - yajl_parser_config cfg = { 1, 1 }; yajl_handle hand; virJSONParser parser = { NULL, NULL, 0 }; virJSONValuePtr ret = NULL; +#ifndef HAVE_YAJL2 + yajl_parser_config cfg = { 1, 1 }; +#endif VIR_DEBUG("string=%s", jsonstring); +#ifdef HAVE_YAJL2 + hand = yajl_alloc(&parserCallbacks, NULL, &parser); + yajl_config(hand, yajl_allow_comments, 1); + yajl_config(hand, yajl_dont_validate_strings, 0); +#else hand = yajl_alloc(&parserCallbacks, &cfg, NULL, &parser); +#endif if (yajl_parse(hand, (const unsigned char *)jsonstring, @@ -1002,15 +1025,26 @@ static int virJSONValueToStringOne(virJSONValuePtr object, char *virJSONValueToString(virJSONValuePtr object) { - yajl_gen_config conf = { 0, " " }; /* Turns off pretty printing since QEMU can't cope */ yajl_gen g; const unsigned char *str; char *ret = NULL; +#ifdef HAVE_YAJL2 + size_t len; +#else unsigned int len; + yajl_gen_config conf = { 0, " " }; /* Turns off pretty printing since QEMU can't cope */ +#endif VIR_DEBUG("object=%p", object); +#ifdef HAVE_YAJL2 + g = yajl_gen_alloc(NULL); + yajl_gen_config(g, yajl_gen_beautify, 0); + yajl_gen_config(g, yajl_gen_indent_string, " "); + yajl_gen_config(g, yajl_gen_validate_utf8, 1); +#else g = yajl_gen_alloc(&conf, NULL); +#endif if (virJSONValueToStringOne(object, g) < 0) { virReportOOMError(); -- 1.7.4.4

On 05/03/2011 11:12 AM, Daniel P. Berrange wrote:
Version 2.0.0 or yajl changed API. It is fairly trivial for us to cope with both APIs in libvirt, so adapt.
* configure.ac: Probe for yajl2 API * src/util/json.c: Conditional support for yajl2 API +++ b/src/util/json.c @@ -709,7 +709,12 @@ static int virJSONParserHandleBoolean(void * ctx, int boolean_)
static int virJSONParserHandleNumber(void * ctx, const char * s,
As long as you're touching this, can we use the preferred format of 'void *ctx' and 'const char *s'?
- unsigned int l) +#ifdef HAVE_YAJL2 + size_t l +#else + unsigned int l +#endif + )
I'm not a fan of #ifdefs inside a function declaration. Can we instead do: #ifdef HAVE_YAJL2 typedef size_t yajl_size; #else typedef unsigned int yajl_size; #endif static int virJSONParserHandleNumber(void *ctx, const char *s, yajl_size l); Those typedefs would then be useful for all three function signatures touched in this file.
@@ -894,14 +909,22 @@ static const yajl_callbacks parserCallbacks = { /* XXX add an incremental streaming parser - yajl trivially supports it */ virJSONValuePtr virJSONValueFromString(const char *jsonstring) { - yajl_parser_config cfg = { 1, 1 }; yajl_handle hand; virJSONParser parser = { NULL, NULL, 0 }; virJSONValuePtr ret = NULL; +#ifndef HAVE_YAJL2 + yajl_parser_config cfg = { 1, 1 }; +#endif
VIR_DEBUG("string=%s", jsonstring);
+#ifdef HAVE_YAJL2 + hand = yajl_alloc(&parserCallbacks, NULL, &parser); + yajl_config(hand, yajl_allow_comments, 1);
Does yajl_config properly handle the case where hand is NULL from the earlier yajl_alloc, or do you need error checking here?
@@ -1002,15 +1025,26 @@ static int virJSONValueToStringOne(virJSONValuePtr object,
char *virJSONValueToString(virJSONValuePtr object) { - yajl_gen_config conf = { 0, " " }; /* Turns off pretty printing since QEMU can't cope */ yajl_gen g; const unsigned char *str; char *ret = NULL; +#ifdef HAVE_YAJL2 + size_t len; +#else unsigned int len;
Again, this part would benefit from the conditional typedefs.
+ yajl_gen_config conf = { 0, " " }; /* Turns off pretty printing since QEMU can't cope */ +#endif
VIR_DEBUG("object=%p", object);
+#ifdef HAVE_YAJL2 + g = yajl_gen_alloc(NULL); + yajl_gen_config(g, yajl_gen_beautify, 0);
Again, any error handling needed? -- Eric Blake eblake@redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org
participants (2)
-
Daniel P. Berrange
-
Eric Blake