diff options
Diffstat (limited to 'jni/ruby/nacl/pepper_main.c')
| -rw-r--r-- | jni/ruby/nacl/pepper_main.c | 732 |
1 files changed, 732 insertions, 0 deletions
diff --git a/jni/ruby/nacl/pepper_main.c b/jni/ruby/nacl/pepper_main.c new file mode 100644 index 0000000..168e8f9 --- /dev/null +++ b/jni/ruby/nacl/pepper_main.c @@ -0,0 +1,732 @@ +/****************************************************************************** + Copyright 2012 Google Inc. All Rights Reserved. + Author: yugui@google.com (Yugui Sonoda) + ******************************************************************************/ + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <pthread.h> +#include <sys/stat.h> +#include <sys/mount.h> +#include <fcntl.h> +#include <pthread.h> +#include "ppapi/c/pp_errors.h" +#include "ppapi/c/pp_module.h" +#include "ppapi/c/pp_var.h" +#include "ppapi/c/ppb.h" +#include "ppapi/c/ppb_core.h" +#include "ppapi/c/ppb_file_ref.h" +#include "ppapi/c/ppb_instance.h" +#include "ppapi/c/ppb_messaging.h" +#include "ppapi/c/ppb_url_loader.h" +#include "ppapi/c/ppb_url_request_info.h" +#include "ppapi/c/ppb_url_response_info.h" +#include "ppapi/c/ppb_var.h" +#include "ppapi/c/ppp.h" +#include "ppapi/c/ppp_instance.h" +#include "ppapi/c/ppp_messaging.h" +#include "nacl_io/nacl_io.h" + +#include "verconf.h" +#include "ruby/ruby.h" +#include "version.h" +#include "gc.h" + +#ifdef HAVE_STRUCT_PPB_CORE +typedef struct PPB_Core PPB_Core; +#endif +#ifdef HAVE_STRUCT_PPB_MESSAGING +typedef struct PPB_Messaging PPB_Messaging; +#endif +#ifdef HAVE_STRUCT_PPB_VAR +typedef struct PPB_Var PPB_Var; +#endif +#ifdef HAVE_STRUCT_PPB_URLLOADER +typedef struct PPB_URLLoader PPB_URLLoader; +#endif +#ifdef HAVE_STRUCT_PPB_URLREQUESTINFO +typedef struct PPB_URLRequestInfo PPB_URLRequestInfo; +#endif +#ifdef HAVE_STRUCT_PPB_URLRESPONSEINFO +typedef struct PPB_URLResponseInfo PPB_URLResponseInfo; +#endif +#ifdef HAVE_STRUCT_PPP_INSTANCE +typedef struct PPP_Instance PPP_Instance; +#endif + +static PP_Module module_id = 0; +static PPB_GetInterface get_browser_interface = NULL; +static PPB_Core* core_interface = NULL; +static PPB_Messaging* messaging_interface = NULL; +static PPB_Var* var_interface = NULL; +static PPB_URLLoader* loader_interface = NULL; +static PPB_URLRequestInfo* request_interface = NULL; +static PPB_URLResponseInfo* response_interface = NULL; +static PPB_FileRef* fileref_interface = NULL; +static struct st_table* instance_data = NULL; + +static VALUE instance_table = Qundef; + +static PP_Instance current_instance = 0; + +/****************************************************************************** + * State of instance + ******************************************************************************/ + +static void inst_mark(void *const ptr); +static void inst_free(void *const ptr); +static size_t inst_memsize(void *const ptr); +static const rb_data_type_t pepper_instance_data_type = { + "PepperInstance", + { inst_mark, inst_free, inst_memsize } +}; + +struct PepperInstance { + PP_Instance instance; + PP_Resource url_loader; + VALUE self; + void* async_call_args; + union { + int32_t as_int; + const char* as_str; + VALUE as_value; + } async_call_result; + char buf[1000]; + + pthread_t th; + pthread_mutex_t mutex; + pthread_cond_t cond; +}; + +struct PepperInstance* +pruby_get_instance(PP_Instance instance) +{ + VALUE self = rb_hash_aref(instance_table, INT2FIX(instance)); + if (RTEST(self)) { + struct PepperInstance *inst; + TypedData_Get_Struct(self, struct PepperInstance, &pepper_instance_data_type, inst); + return inst; + } + else { + return NULL; + } +} + +#define GET_PEPPER_INSTANCE() (pruby_get_instance(current_instance)) + +struct PepperInstance* +pruby_register_instance(PP_Instance instance) +{ + VALUE obj; + struct PepperInstance *data; + obj = TypedData_Make_Struct(rb_cData, struct PepperInstance, &pepper_instance_data_type, data); + data->self = obj; + data->instance = instance; + data->url_loader = 0; + + pthread_mutex_init(&data->mutex, NULL); + pthread_cond_init(&data->cond, NULL); + + rb_hash_aset(instance_table, INT2FIX(instance), obj); + return data; +} + +int +pruby_unregister_instance(PP_Instance instance) +{ + VALUE inst = rb_hash_delete(instance_table, INT2FIX(instance)); + return RTEST(inst); +} + +static void +inst_mark(void *const ptr) +{ + RUBY_MARK_ENTER("PepperInstance"0); + if (ptr) { + const struct PepperInstance* inst = (struct PepperInstance*)ptr; + RUBY_MARK_UNLESS_NULL(inst->async_call_result.as_value); + } + RUBY_MARK_LEAVE("PepperInstance"0); +} + +static void +inst_free(void *const ptr) +{ + ruby_xfree(ptr); +} + +static size_t +inst_memsize(void *const ptr) +{ + if (ptr) { + const struct PepperInstance* inst = (struct PepperInstance*)ptr; + return sizeof(*inst); + } else { + return 0; + } +} + +void +pruby_async_return_int(void* data, int32_t result) +{ + /* PPAPI main thread */ + struct PepperInstance* const instance = (struct PepperInstance*)data; + instance->async_call_result.as_int = result; + if (pthread_cond_signal(&instance->cond)) { + perror("pepper-ruby:pthread_cond_signal"); + } +} + +void +pruby_async_return_str(void* data, const char *result) +{ + /* PPAPI main thread */ + struct PepperInstance* const instance = (struct PepperInstance*)data; + instance->async_call_result.as_str = result; + if (pthread_cond_signal(&instance->cond)) { + perror("pepper-ruby:pthread_cond_signal"); + } +} + +void +pruby_async_return_value(void* data, VALUE value) +{ + /* PPAPI main thread */ + struct PepperInstance* const instance = (struct PepperInstance*)data; + instance->async_call_result.as_value = value; + if (pthread_cond_signal(&instance->cond)) { + perror("pepper-ruby:pthread_cond_signal"); + } +} +/****************************************************************************** + * Conversion between Ruby's VALUE, Pepper's Var and C string + ******************************************************************************/ + +/** + * Creates a new string PP_Var from C string. The resulting object will be a + * refcounted string object. It will be AddRef()ed for the caller. When the + * caller is done with it, it should be Release()d. + * @param[in] str C string to be converted to PP_Var + * @return PP_Var containing string. + */ +static struct PP_Var +pruby_cstr_to_var(const char* str) +{ +#ifndef PPB_VAR_INTERFACE_1_1 + if (var_interface != NULL) + return var_interface->VarFromUtf8(module_id, str, strlen(str)); + return PP_MakeUndefined(); +#else + return var_interface->VarFromUtf8(str, strlen(str)); +#endif +} + +/** + * Returns a mutable C string contained in the @a var or NULL if @a var is not + * string. This makes a copy of the string in the @a var and adds a NULL + * terminator. Note that VarToUtf8() does not guarantee the NULL terminator on + * the returned string. See the comments for VarToUtf8() in ppapi/c/ppb_var.h + * for more info. The caller is responsible for freeing the returned memory. + * @param[in] var PP_Var containing string. + * @return a mutable C string representation of @a var. + * @note The caller is responsible for freeing the returned string. + */ +static char* +pruby_var_to_cstr(struct PP_Var var) +{ + uint32_t len = 0; + if (var_interface != NULL) { + const char* var_c_str = var_interface->VarToUtf8(var, &len); + if (len > 0) { + char* c_str = (char*)malloc(len + 1); + memcpy(c_str, var_c_str, len); + c_str[len] = '\0'; + return c_str; + } + } + return NULL; +} + +static struct PP_Var +pruby_str_to_var(volatile VALUE str) +{ + if (!RB_TYPE_P(str, T_STRING)) { + fprintf(stderr, "[BUG] Unexpected object type: %x\n", TYPE(str)); + exit(EXIT_FAILURE); + } +#ifndef PPB_VAR_INTERFACE_1_1 + if (var_interface != NULL) { + return var_interface->VarFromUtf8(module_id, RSTRING_PTR(str), RSTRING_LEN(str)); + } +#else + return var_interface->VarFromUtf8(RSTRING_PTR(str), RSTRING_LEN(str)); +#endif + return PP_MakeUndefined(); +} + +static struct PP_Var +pruby_obj_to_var(volatile VALUE obj) +{ + static const char* const error = + "throw 'Failed to convert the result to a JavaScript object';"; + int state; + obj = rb_protect(&rb_obj_as_string, obj, &state); + if (!state) { + return pruby_str_to_var(obj); + } + else { + return pruby_cstr_to_var(error); + } +} + +int +pruby_var_equal_to_cstr_p(struct PP_Var lhs, const char* rhs) +{ + uint32_t len = 0; + if (var_interface == NULL) { + return 0; + } + else { + const char* const cstr = var_interface->VarToUtf8(lhs, &len); + return strncmp(cstr, rhs, len) == 0; + } +} + +int +pruby_var_prefixed_p(struct PP_Var var, const char* prefix) +{ + uint32_t len = 0; + if (var_interface == NULL) { + return 0; + } + else { + const char* const cstr = var_interface->VarToUtf8(var, &len); + const size_t prefix_len = strlen(prefix); + return len >= prefix_len && memcmp(cstr, prefix, len) == 0; + } +} + + +/****************************************************************************** + * Messaging + ******************************************************************************/ + +/* Posts the given C string as a message. + * @param data pointer to a NULL-terminated string */ +void +pruby_post_cstr(void* data) +{ + /* PPAPI main thread */ + struct PepperInstance* const instance = (struct PepperInstance*)data; + const char* const msg = (const char*)instance->async_call_args; + messaging_interface->PostMessage(instance->instance, + pruby_cstr_to_var(msg)); +} + +/* Posts the given Ruby VALUE as a message. + * @param data a VALUE casted to void* */ +void +pruby_post_value(void* data) +{ + /* PPAPI main thread */ + struct PepperInstance* const instance = (struct PepperInstance*)data; + volatile VALUE value = (VALUE)instance->async_call_args; + messaging_interface->PostMessage(instance->instance, pruby_obj_to_var(value)); +} + + + +/****************************************************************************** + * Ruby initialization + ******************************************************************************/ + +static void +init_loadpath(void) +{ + ruby_incpush("lib/ruby/"RUBY_LIB_VERSION); + ruby_incpush("lib/ruby/"RUBY_LIB_VERSION"/"RUBY_PLATFORM); + ruby_incpush("."); +} + +static VALUE +init_libraries_internal(VALUE unused) +{ + extern void Init_enc(); + extern void Init_ext(); + + init_loadpath(); + Init_enc(); + Init_ext(); + return Qnil; +} + +static void* +init_libraries(void* data) +{ + int state; + struct PepperInstance* const instance = (struct PepperInstance*)data; + current_instance = instance->instance; + + if (pthread_mutex_lock(&instance->mutex)) { + perror("pepper-ruby:pthread_mutex_lock"); + return 0; + } + rb_protect(&init_libraries_internal, Qnil, &state); + pthread_mutex_unlock(&instance->mutex); + + if (state) { + volatile VALUE err = rb_errinfo(); + err = rb_obj_as_string(err); + } else { + instance->async_call_args = (void*)"rubyReady"; + core_interface->CallOnMainThread( + 0, PP_MakeCompletionCallback(pruby_post_cstr, instance), 0); + } + return NULL; +} + +static int +init_libraries_if_necessary(void) +{ + static int initialized = 0; + if (!initialized) { + struct PepperInstance* const instance = GET_PEPPER_INSTANCE(); + int err; + initialized = 1; + err = pthread_create(&instance->th, NULL, &init_libraries, instance); + if (err) { + fprintf(stderr, "pepper_ruby:pthread_create: %s\n", strerror(err)); + exit(EXIT_FAILURE); + } + pthread_detach(instance->th); + } + return 0; +} + +static int +reopen_fd(int fd, const char* path, int flags) { + int fd2 = open(path, flags); + if (fd2 < 0) { + perror("open fd"); + return -1; + } + if (dup2(fd2, fd) < 0) { + perror("dup2 fd"); + return -1; + } + if (close(fd2)) { + perror("close old fd"); + return -1; + } + return fd; +} + +static int +pruby_init(void) +{ + RUBY_INIT_STACK; + ruby_init(); + + instance_table = rb_hash_new(); + rb_gc_register_mark_object(instance_table); + + return 0; +} + + +/****************************************************************************** + * Ruby evaluation + ******************************************************************************/ + +static void* +pruby_eval(void* data) +{ + extern VALUE ruby_eval_string_from_file_protect(const char* src, const char* path, int* state); + struct PepperInstance* const instance = (struct PepperInstance*)data; + volatile VALUE src = (VALUE)instance->async_call_args; + volatile VALUE result = Qnil; + volatile int state; + + RUBY_INIT_STACK; + + if (pthread_mutex_lock(&instance->mutex)) { + perror("pepper-ruby:pthread_mutex_lock"); + return 0; + } + result = ruby_eval_string_from_file_protect( + RSTRING_PTR(src), "(pepper-ruby)", &state); + pthread_mutex_unlock(&instance->mutex); + + if (!state) { + instance->async_call_args = + rb_str_concat(rb_usascii_str_new_cstr("return:"), + rb_obj_as_string(result)); + core_interface->CallOnMainThread( + 0, PP_MakeCompletionCallback(pruby_post_value, instance), 0); + return NULL; + } + else { + rb_set_errinfo(Qnil); + instance->async_call_args = + rb_str_concat(rb_usascii_str_new_cstr("error:"), + rb_obj_as_string(result)); + core_interface->CallOnMainThread( + 0, PP_MakeCompletionCallback(pruby_post_value, instance), 0); + return NULL; + } +} + + +/****************************************************************************** + * Pepper Module callbacks + ******************************************************************************/ + +/** + * Called when the NaCl module is instantiated on the web page. The identifier + * of the new instance will be passed in as the first argument (this value is + * generated by the browser and is an opaque handle). This is called for each + * instantiation of the NaCl module, which is each time the <embed> tag for + * this module is encountered. + * + * If this function reports a failure (by returning @a PP_FALSE), the NaCl + * module will be deleted and DidDestroy will be called. + * @param[in] instance The identifier of the new instance representing this + * NaCl module. + * @param[in] argc The number of arguments contained in @a argn and @a argv. + * @param[in] argn An array of argument names. These argument names are + * supplied in the <embed> tag, for example: + * <embed id="nacl_module" dimensions="2"> + * will produce two arguments, one named "id" and one named "dimensions". + * @param[in] argv An array of argument values. These are the values of the + * arguments listed in the <embed> tag. In the above example, there will + * be two elements in this array, "nacl_module" and "2". The indices of + * these values match the indices of the corresponding names in @a argn. + * @return @a PP_TRUE on success. + */ +static PP_Bool +Instance_DidCreate(PP_Instance instance, + uint32_t argc, const char* argn[], const char* argv[]) +{ + struct PepperInstance* data = pruby_register_instance(instance); + current_instance = instance; + + nacl_io_init_ppapi(instance, get_browser_interface); + + if (mount("", "/dev2", "dev", 0, "")) { + perror("mount dev"); + return PP_FALSE; + } + if (reopen_fd(0, "/dev2/stdin", O_RDONLY) < 0) { + perror("reopen stdin"); + return PP_FALSE; + } + if (reopen_fd(1, "/dev2/stdout", O_WRONLY) < 0) { + perror("reopen stdout"); + return PP_FALSE; + } + if (reopen_fd(2, "/dev2/console1", O_WRONLY) < 0) { + perror("reopen stderr"); + return PP_FALSE; + } + + /* TODO(yugui) Unmount original /dev */ + + if (mount("/lib", "/lib", "httpfs", + 0, "allow_cross_origin_requests=false")) { + perror("mount httpfs"); + return PP_FALSE; + } + + return init_libraries_if_necessary() ? PP_FALSE : PP_TRUE; +} + +/** + * Called when the NaCl module is destroyed. This will always be called, + * even if DidCreate returned failure. This routine should deallocate any data + * associated with the instance. + * @param[in] instance The identifier of the instance representing this NaCl + * module. + */ +static void Instance_DidDestroy(PP_Instance instance) { + struct PepperInstance* data = pruby_get_instance(instance); + core_interface->ReleaseResource(data->url_loader); + pruby_unregister_instance(instance); +} + +/** + * Called when the position, the size, or the clip rect of the element in the + * browser that corresponds to this NaCl module has changed. + * @param[in] instance The identifier of the instance representing this NaCl + * module. + * @param[in] position The location on the page of this NaCl module. This is + * relative to the top left corner of the viewport, which changes as the + * page is scrolled. + * @param[in] clip The visible region of the NaCl module. This is relative to + * the top left of the plugin's coordinate system (not the page). If the + * plugin is invisible, @a clip will be (0, 0, 0, 0). + */ +#ifndef PPP_INSTANCE_INTERFACE_1_1 +static void +Instance_DidChangeView(PP_Instance instance, + const struct PP_Rect* position, + const struct PP_Rect* clip) +{ +} +#else +static void +Instance_DidChangeView(PP_Instance instance, PP_Resource view_resource) +{ +} +#endif + +/** + * Notification that the given NaCl module has gained or lost focus. + * Having focus means that keyboard events will be sent to the NaCl module + * represented by @a instance. A NaCl module's default condition is that it + * will not have focus. + * + * Note: clicks on NaCl modules will give focus only if you handle the + * click event. You signal if you handled it by returning @a true from + * HandleInputEvent. Otherwise the browser will bubble the event and give + * focus to the element on the page that actually did end up consuming it. + * If you're not getting focus, check to make sure you're returning true from + * the mouse click in HandleInputEvent. + * @param[in] instance The identifier of the instance representing this NaCl + * module. + * @param[in] has_focus Indicates whether this NaCl module gained or lost + * event focus. + */ +static void +Instance_DidChangeFocus(PP_Instance instance, PP_Bool has_focus) +{ +} + +/** + * Handler that gets called after a full-frame module is instantiated based on + * registered MIME types. This function is not called on NaCl modules. This + * function is essentially a place-holder for the required function pointer in + * the PPP_Instance structure. + * @param[in] instance The identifier of the instance representing this NaCl + * module. + * @param[in] url_loader A PP_Resource an open PPB_URLLoader instance. + * @return PP_FALSE. + */ +static PP_Bool +Instance_HandleDocumentLoad(PP_Instance instance, PP_Resource url_loader) +{ + /* NaCl modules do not need to handle the document load function. */ + return PP_FALSE; +} + + +/** + * Handler for messages coming in from the browser via postMessage. The + * @a var_message can contain anything: a JSON string; a string that encodes + * method names and arguments; etc. For example, you could use JSON.stringify + * in the browser to create a message that contains a method name and some + * parameters, something like this: + * var json_message = JSON.stringify({ "myMethod" : "3.14159" }); + * nacl_module.postMessage(json_message); + * On receipt of this message in @a var_message, you could parse the JSON to + * retrieve the method name, match it to a function call, and then call it with + * the parameter. + * @param[in] instance The instance ID. + * @param[in] message The contents, copied by value, of the message sent from + * browser via postMessage. + */ +void +Messaging_HandleMessage(PP_Instance instance, struct PP_Var var_message) +{ + char* const message = pruby_var_to_cstr(var_message); + size_t message_len = strlen(message); + current_instance = instance; + + if (strstr(message, "eval:") != NULL) { + volatile VALUE src; + struct PepperInstance* const instance_data = GET_PEPPER_INSTANCE(); + int err; +#define EVAL_PREFIX_LEN 5 + src = rb_str_new(message + EVAL_PREFIX_LEN, message_len - EVAL_PREFIX_LEN); + instance_data->async_call_args = (void*)src; + err = pthread_create(&instance_data->th, NULL, &pruby_eval, instance_data); + if (err) { + fprintf(stderr, "pepper_ruby:pthread_create: %s\n", strerror(err)); + exit(EXIT_FAILURE); + } + pthread_detach(instance_data->th); + } + free(message); +} + +/** + * Entry points for the module. + * Initialize instance interface and scriptable object class. + * @param[in] a_module_id Module ID + * @param[in] get_browser_interface Pointer to PPB_GetInterface + * @return PP_OK on success, any other value on failure. + */ +PP_EXPORT int32_t +PPP_InitializeModule(PP_Module a_module_id, PPB_GetInterface a_get_browser_interface) +{ + module_id = a_module_id; + get_browser_interface = a_get_browser_interface; + core_interface = (PPB_Core*)(get_browser_interface(PPB_CORE_INTERFACE)); + if (core_interface == NULL) return PP_ERROR_NOINTERFACE; + + var_interface = (PPB_Var*)(get_browser_interface(PPB_VAR_INTERFACE)); + if (var_interface == NULL) return PP_ERROR_NOINTERFACE; + + messaging_interface = (PPB_Messaging*)(get_browser_interface(PPB_MESSAGING_INTERFACE)); + if (messaging_interface == NULL) return PP_ERROR_NOINTERFACE; + + loader_interface = (PPB_URLLoader*)(get_browser_interface(PPB_URLLOADER_INTERFACE)); + if (loader_interface == NULL) return PP_ERROR_NOINTERFACE; + + request_interface = (PPB_URLRequestInfo*)(get_browser_interface(PPB_URLREQUESTINFO_INTERFACE)); + if (request_interface == NULL) return PP_ERROR_NOINTERFACE; + + response_interface = (PPB_URLResponseInfo*)(get_browser_interface(PPB_URLRESPONSEINFO_INTERFACE)); + if (response_interface == NULL) return PP_ERROR_NOINTERFACE; + + fileref_interface = (PPB_FileRef*)(get_browser_interface(PPB_FILEREF_INTERFACE)); + if (fileref_interface == NULL) return PP_ERROR_NOINTERFACE; + + return pruby_init() ? PP_ERROR_FAILED : PP_OK; +} + +/** + * Returns an interface pointer for the interface of the given name, or NULL + * if the interface is not supported. + * @param[in] interface_name name of the interface + * @return pointer to the interface + */ +PP_EXPORT const void* +PPP_GetInterface(const char* interface_name) +{ + if (strcmp(interface_name, PPP_INSTANCE_INTERFACE) == 0) { + static PPP_Instance instance_interface = { + &Instance_DidCreate, + &Instance_DidDestroy, + &Instance_DidChangeView, + &Instance_DidChangeFocus, + &Instance_HandleDocumentLoad + }; + return &instance_interface; + } else if (strcmp(interface_name, PPP_MESSAGING_INTERFACE) == 0) { + static PPP_Messaging messaging_interface = { + &Messaging_HandleMessage + }; + return &messaging_interface; + } + return NULL; +} + +/** + * Called before the plugin module is unloaded. + */ +PP_EXPORT void +PPP_ShutdownModule(void) +{ + ruby_cleanup(0); +} |