initial commit

third_party/libhv/examples/jsonrpc/cJSON.h

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+/*
+  Copyright (c) 2009-2017 Dave Gamble and cJSON contributors
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in
+  all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+  THE SOFTWARE.
+*/
+
+#ifndef cJSON__h
+#define cJSON__h
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#if !defined(__WINDOWS__) && (defined(WIN32) || defined(WIN64) || defined(_MSC_VER) || defined(_WIN32))
+#define __WINDOWS__
+#endif
+
+#ifdef __WINDOWS__
+
+/* When compiling for windows, we specify a specific calling convention to avoid issues where we are being called from a project with a different default calling convention.  For windows you have 3 define options:
+
+CJSON_HIDE_SYMBOLS - Define this in the case where you don't want to ever dllexport symbols
+CJSON_EXPORT_SYMBOLS - Define this on library build when you want to dllexport symbols (default)
+CJSON_IMPORT_SYMBOLS - Define this if you want to dllimport symbol
+
+For *nix builds that support visibility attribute, you can define similar behavior by
+
+setting default visibility to hidden by adding
+-fvisibility=hidden (for gcc)
+or
+-xldscope=hidden (for sun cc)
+to CFLAGS
+
+then using the CJSON_API_VISIBILITY flag to "export" the same symbols the way CJSON_EXPORT_SYMBOLS does
+
+*/
+
+#define CJSON_CDECL __cdecl
+#define CJSON_STDCALL __stdcall
+
+/* export symbols by default, this is necessary for copy pasting the C and header file */
+#if !defined(CJSON_HIDE_SYMBOLS) && !defined(CJSON_IMPORT_SYMBOLS) && !defined(CJSON_EXPORT_SYMBOLS)
+#define CJSON_EXPORT_SYMBOLS
+#endif
+
+#if defined(CJSON_HIDE_SYMBOLS)
+#define CJSON_PUBLIC(type)   type CJSON_STDCALL
+#elif defined(CJSON_EXPORT_SYMBOLS)
+#define CJSON_PUBLIC(type)   __declspec(dllexport) type CJSON_STDCALL
+#elif defined(CJSON_IMPORT_SYMBOLS)
+#define CJSON_PUBLIC(type)   __declspec(dllimport) type CJSON_STDCALL
+#endif
+#else /* !__WINDOWS__ */
+#define CJSON_CDECL
+#define CJSON_STDCALL
+
+#if (defined(__GNUC__) || defined(__SUNPRO_CC) || defined (__SUNPRO_C)) && defined(CJSON_API_VISIBILITY)
+#define CJSON_PUBLIC(type)   __attribute__((visibility("default"))) type
+#else
+#define CJSON_PUBLIC(type) type
+#endif
+#endif
+
+/* project version */
+#define CJSON_VERSION_MAJOR 1
+#define CJSON_VERSION_MINOR 7
+#define CJSON_VERSION_PATCH 14
+
+#include <stddef.h>
+
+/* cJSON Types: */
+#define cJSON_Invalid (0)
+#define cJSON_False  (1 << 0)
+#define cJSON_True   (1 << 1)
+#define cJSON_NULL   (1 << 2)
+#define cJSON_Number (1 << 3)
+#define cJSON_String (1 << 4)
+#define cJSON_Array  (1 << 5)
+#define cJSON_Object (1 << 6)
+#define cJSON_Raw    (1 << 7) /* raw json */
+
+#define cJSON_IsReference 256
+#define cJSON_StringIsConst 512
+
+/* The cJSON structure: */
+typedef struct cJSON
+{
+    /* next/prev allow you to walk array/object chains. Alternatively, use GetArraySize/GetArrayItem/GetObjectItem */
+    struct cJSON *next;
+    struct cJSON *prev;
+    /* An array or object item will have a child pointer pointing to a chain of the items in the array/object. */
+    struct cJSON *child;
+
+    /* The type of the item, as above. */
+    int type;
+
+    /* The item's string, if type==cJSON_String  and type == cJSON_Raw */
+    char *valuestring;
+    /* writing to valueint is DEPRECATED, use cJSON_SetNumberValue instead */
+    int valueint;
+    /* The item's number, if type==cJSON_Number */
+    double valuedouble;
+
+    /* The item's name string, if this item is the child of, or is in the list of subitems of an object. */
+    char *string;
+} cJSON;
+
+typedef struct cJSON_Hooks
+{
+      /* malloc/free are CDECL on Windows regardless of the default calling convention of the compiler, so ensure the hooks allow passing those functions directly. */
+      void *(CJSON_CDECL *malloc_fn)(size_t sz);
+      void (CJSON_CDECL *free_fn)(void *ptr);
+} cJSON_Hooks;
+
+typedef int cJSON_bool;
+
+/* Limits how deeply nested arrays/objects can be before cJSON rejects to parse them.
+ * This is to prevent stack overflows. */
+#ifndef CJSON_NESTING_LIMIT
+#define CJSON_NESTING_LIMIT 1000
+#endif
+
+/* returns the version of cJSON as a string */
+CJSON_PUBLIC(const char*) cJSON_Version(void);
+
+/* Supply malloc, realloc and free functions to cJSON */
+CJSON_PUBLIC(void) cJSON_InitHooks(cJSON_Hooks* hooks);
+
+/* Memory Management: the caller is always responsible to free the results from all variants of cJSON_Parse (with cJSON_Delete) and cJSON_Print (with stdlib free, cJSON_Hooks.free_fn, or cJSON_free as appropriate). The exception is cJSON_PrintPreallocated, where the caller has full responsibility of the buffer. */
+/* Supply a block of JSON, and this returns a cJSON object you can interrogate. */
+CJSON_PUBLIC(cJSON *) cJSON_Parse(const char *value);
+CJSON_PUBLIC(cJSON *) cJSON_ParseWithLength(const char *value, size_t buffer_length);
+/* ParseWithOpts allows you to require (and check) that the JSON is null terminated, and to retrieve the pointer to the final byte parsed. */
+/* If you supply a ptr in return_parse_end and parsing fails, then return_parse_end will contain a pointer to the error so will match cJSON_GetErrorPtr(). */
+CJSON_PUBLIC(cJSON *) cJSON_ParseWithOpts(const char *value, const char **return_parse_end, cJSON_bool require_null_terminated);
+CJSON_PUBLIC(cJSON *) cJSON_ParseWithLengthOpts(const char *value, size_t buffer_length, const char **return_parse_end, cJSON_bool require_null_terminated);
+
+/* Render a cJSON entity to text for transfer/storage. */
+CJSON_PUBLIC(char *) cJSON_Print(const cJSON *item);
+/* Render a cJSON entity to text for transfer/storage without any formatting. */
+CJSON_PUBLIC(char *) cJSON_PrintUnformatted(const cJSON *item);
+/* Render a cJSON entity to text using a buffered strategy. prebuffer is a guess at the final size. guessing well reduces reallocation. fmt=0 gives unformatted, =1 gives formatted */
+CJSON_PUBLIC(char *) cJSON_PrintBuffered(const cJSON *item, int prebuffer, cJSON_bool fmt);
+/* Render a cJSON entity to text using a buffer already allocated in memory with given length. Returns 1 on success and 0 on failure. */
+/* NOTE: cJSON is not always 100% accurate in estimating how much memory it will use, so to be safe allocate 5 bytes more than you actually need */
+CJSON_PUBLIC(cJSON_bool) cJSON_PrintPreallocated(cJSON *item, char *buffer, const int length, const cJSON_bool format);
+/* Delete a cJSON entity and all subentities. */
+CJSON_PUBLIC(void) cJSON_Delete(cJSON *item);
+
+/* Returns the number of items in an array (or object). */
+CJSON_PUBLIC(int) cJSON_GetArraySize(const cJSON *array);
+/* Retrieve item number "index" from array "array". Returns NULL if unsuccessful. */
+CJSON_PUBLIC(cJSON *) cJSON_GetArrayItem(const cJSON *array, int index);
+/* Get item "string" from object. Case insensitive. */
+CJSON_PUBLIC(cJSON *) cJSON_GetObjectItem(const cJSON * const object, const char * const string);
+CJSON_PUBLIC(cJSON *) cJSON_GetObjectItemCaseSensitive(const cJSON * const object, const char * const string);
+CJSON_PUBLIC(cJSON_bool) cJSON_HasObjectItem(const cJSON *object, const char *string);
+/* For analysing failed parses. This returns a pointer to the parse error. You'll probably need to look a few chars back to make sense of it. Defined when cJSON_Parse() returns 0. 0 when cJSON_Parse() succeeds. */
+CJSON_PUBLIC(const char *) cJSON_GetErrorPtr(void);
+
+/* Check item type and return its value */
+CJSON_PUBLIC(char *) cJSON_GetStringValue(const cJSON * const item);
+CJSON_PUBLIC(double) cJSON_GetNumberValue(const cJSON * const item);
+
+/* These functions check the type of an item */
+CJSON_PUBLIC(cJSON_bool) cJSON_IsInvalid(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsFalse(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsTrue(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsBool(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsNull(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsNumber(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsString(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsArray(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsObject(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsRaw(const cJSON * const item);
+
+/* These calls create a cJSON item of the appropriate type. */
+CJSON_PUBLIC(cJSON *) cJSON_CreateNull(void);
+CJSON_PUBLIC(cJSON *) cJSON_CreateTrue(void);
+CJSON_PUBLIC(cJSON *) cJSON_CreateFalse(void);
+CJSON_PUBLIC(cJSON *) cJSON_CreateBool(cJSON_bool boolean);
+CJSON_PUBLIC(cJSON *) cJSON_CreateNumber(double num);
+CJSON_PUBLIC(cJSON *) cJSON_CreateString(const char *string);
+/* raw json */
+CJSON_PUBLIC(cJSON *) cJSON_CreateRaw(const char *raw);
+CJSON_PUBLIC(cJSON *) cJSON_CreateArray(void);
+CJSON_PUBLIC(cJSON *) cJSON_CreateObject(void);
+
+/* Create a string where valuestring references a string so
+ * it will not be freed by cJSON_Delete */
+CJSON_PUBLIC(cJSON *) cJSON_CreateStringReference(const char *string);
+/* Create an object/array that only references it's elements so
+ * they will not be freed by cJSON_Delete */
+CJSON_PUBLIC(cJSON *) cJSON_CreateObjectReference(const cJSON *child);
+CJSON_PUBLIC(cJSON *) cJSON_CreateArrayReference(const cJSON *child);
+
+/* These utilities create an Array of count items.
+ * The parameter count cannot be greater than the number of elements in the number array, otherwise array access will be out of bounds.*/
+CJSON_PUBLIC(cJSON *) cJSON_CreateIntArray(const int *numbers, int count);
+CJSON_PUBLIC(cJSON *) cJSON_CreateFloatArray(const float *numbers, int count);
+CJSON_PUBLIC(cJSON *) cJSON_CreateDoubleArray(const double *numbers, int count);
+CJSON_PUBLIC(cJSON *) cJSON_CreateStringArray(const char *const *strings, int count);
+
+/* Append item to the specified array/object. */
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemToArray(cJSON *array, cJSON *item);
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemToObject(cJSON *object, const char *string, cJSON *item);
+/* Use this when string is definitely const (i.e. a literal, or as good as), and will definitely survive the cJSON object.
+ * WARNING: When this function was used, make sure to always check that (item->type & cJSON_StringIsConst) is zero before
+ * writing to `item->string` */
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemToObjectCS(cJSON *object, const char *string, cJSON *item);
+/* Append reference to item to the specified array/object. Use this when you want to add an existing cJSON to a new cJSON, but don't want to corrupt your existing cJSON. */
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemReferenceToArray(cJSON *array, cJSON *item);
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemReferenceToObject(cJSON *object, const char *string, cJSON *item);
+
+/* Remove/Detach items from Arrays/Objects. */
+CJSON_PUBLIC(cJSON *) cJSON_DetachItemViaPointer(cJSON *parent, cJSON * const item);
+CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromArray(cJSON *array, int which);
+CJSON_PUBLIC(void) cJSON_DeleteItemFromArray(cJSON *array, int which);
+CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromObject(cJSON *object, const char *string);
+CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromObjectCaseSensitive(cJSON *object, const char *string);
+CJSON_PUBLIC(void) cJSON_DeleteItemFromObject(cJSON *object, const char *string);
+CJSON_PUBLIC(void) cJSON_DeleteItemFromObjectCaseSensitive(cJSON *object, const char *string);
+
+/* Update array items. */
+CJSON_PUBLIC(cJSON_bool) cJSON_InsertItemInArray(cJSON *array, int which, cJSON *newitem); /* Shifts pre-existing items to the right. */
+CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemViaPointer(cJSON * const parent, cJSON * const item, cJSON * replacement);
+CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemInArray(cJSON *array, int which, cJSON *newitem);
+CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemInObject(cJSON *object,const char *string,cJSON *newitem);
+CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemInObjectCaseSensitive(cJSON *object,const char *string,cJSON *newitem);
+
+/* Duplicate a cJSON item */
+CJSON_PUBLIC(cJSON *) cJSON_Duplicate(const cJSON *item, cJSON_bool recurse);
+/* Duplicate will create a new, identical cJSON item to the one you pass, in new memory that will
+ * need to be released. With recurse!=0, it will duplicate any children connected to the item.
+ * The item->next and ->prev pointers are always zero on return from Duplicate. */
+/* Recursively compare two cJSON items for equality. If either a or b is NULL or invalid, they will be considered unequal.
+ * case_sensitive determines if object keys are treated case sensitive (1) or case insensitive (0) */
+CJSON_PUBLIC(cJSON_bool) cJSON_Compare(const cJSON * const a, const cJSON * const b, const cJSON_bool case_sensitive);
+
+/* Minify a strings, remove blank characters(such as ' ', '\t', '\r', '\n') from strings.
+ * The input pointer json cannot point to a read-only address area, such as a string constant, 
+ * but should point to a readable and writable adress area. */
+CJSON_PUBLIC(void) cJSON_Minify(char *json);
+
+/* Helper functions for creating and adding items to an object at the same time.
+ * They return the added item or NULL on failure. */
+CJSON_PUBLIC(cJSON*) cJSON_AddNullToObject(cJSON * const object, const char * const name);
+CJSON_PUBLIC(cJSON*) cJSON_AddTrueToObject(cJSON * const object, const char * const name);
+CJSON_PUBLIC(cJSON*) cJSON_AddFalseToObject(cJSON * const object, const char * const name);
+CJSON_PUBLIC(cJSON*) cJSON_AddBoolToObject(cJSON * const object, const char * const name, const cJSON_bool boolean);
+CJSON_PUBLIC(cJSON*) cJSON_AddNumberToObject(cJSON * const object, const char * const name, const double number);
+CJSON_PUBLIC(cJSON*) cJSON_AddStringToObject(cJSON * const object, const char * const name, const char * const string);
+CJSON_PUBLIC(cJSON*) cJSON_AddRawToObject(cJSON * const object, const char * const name, const char * const raw);
+CJSON_PUBLIC(cJSON*) cJSON_AddObjectToObject(cJSON * const object, const char * const name);
+CJSON_PUBLIC(cJSON*) cJSON_AddArrayToObject(cJSON * const object, const char * const name);
+
+/* When assigning an integer value, it needs to be propagated to valuedouble too. */
+#define cJSON_SetIntValue(object, number) ((object) ? (object)->valueint = (object)->valuedouble = (number) : (number))
+/* helper for the cJSON_SetNumberValue macro */
+CJSON_PUBLIC(double) cJSON_SetNumberHelper(cJSON *object, double number);
+#define cJSON_SetNumberValue(object, number) ((object != NULL) ? cJSON_SetNumberHelper(object, (double)number) : (number))
+/* Change the valuestring of a cJSON_String object, only takes effect when type of object is cJSON_String */
+CJSON_PUBLIC(char*) cJSON_SetValuestring(cJSON *object, const char *valuestring);
+
+/* Macro for iterating over an array or object */
+#define cJSON_ArrayForEach(element, array) for(element = (array != NULL) ? (array)->child : NULL; element != NULL; element = element->next)
+
+/* malloc/free objects using the malloc/free functions that have been set with cJSON_InitHooks */
+CJSON_PUBLIC(void *) cJSON_malloc(size_t size);
+CJSON_PUBLIC(void) cJSON_free(void *object);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

third_party/libhv/examples/jsonrpc/handler.h

@@ -0,0 +1,82 @@
+#ifndef HV_JSON_RPC_HANDLER_H_
+#define HV_JSON_RPC_HANDLER_H_
+
+#include "router.h"
+
+void error_response(cJSON* jres, int code, const char* message) {
+    cJSON* jerror = cJSON_CreateObject();
+    cJSON_AddItemToObject(jerror, "code", cJSON_CreateNumber(code));
+    cJSON_AddItemToObject(jerror, "message", cJSON_CreateString(message));
+    cJSON_AddItemToObject(jres, "error", jerror);
+}
+
+void not_found(cJSON* jreq, cJSON* jres) {
+    error_response(jres, 404, "Not Found");
+}
+
+void bad_request(cJSON* jreq, cJSON* jres) {
+    error_response(jres, 400, "Bad Request");
+}
+
+void calc_add(cJSON* jreq, cJSON* jres) {
+    cJSON* jparams = cJSON_GetObjectItem(jreq, "params");
+    if (cJSON_GetArraySize(jparams) != 2) {
+        bad_request(jreq, jres);
+        return;
+    }
+    cJSON* jnum1 = cJSON_GetArrayItem(jparams, 0);
+    int num1 = cJSON_GetNumberValue(jnum1);
+    cJSON* jnum2 = cJSON_GetArrayItem(jparams, 1);
+    int num2 = cJSON_GetNumberValue(jnum2);
+    int result = num1 + num2;
+    cJSON_AddItemToObject(jres, "result", cJSON_CreateNumber(result));
+}
+
+void calc_sub(cJSON* jreq, cJSON* jres) {
+    cJSON* jparams = cJSON_GetObjectItem(jreq, "params");
+    if (cJSON_GetArraySize(jparams) != 2) {
+        bad_request(jreq, jres);
+        return;
+    }
+    cJSON* jnum1 = cJSON_GetArrayItem(jparams, 0);
+    int num1 = cJSON_GetNumberValue(jnum1);
+    cJSON* jnum2 = cJSON_GetArrayItem(jparams, 1);
+    int num2 = cJSON_GetNumberValue(jnum2);
+    int result = num1 - num2;
+    cJSON_AddItemToObject(jres, "result", cJSON_CreateNumber(result));
+}
+
+void calc_mul(cJSON* jreq, cJSON* jres) {
+    cJSON* jparams = cJSON_GetObjectItem(jreq, "params");
+    if (cJSON_GetArraySize(jparams) != 2) {
+        bad_request(jreq, jres);
+        return;
+    }
+    cJSON* jnum1 = cJSON_GetArrayItem(jparams, 0);
+    int num1 = cJSON_GetNumberValue(jnum1);
+    cJSON* jnum2 = cJSON_GetArrayItem(jparams, 1);
+    int num2 = cJSON_GetNumberValue(jnum2);
+    int result = num1 * num2;
+    cJSON_AddItemToObject(jres, "result", cJSON_CreateNumber(result));
+}
+
+void calc_div(cJSON* jreq, cJSON* jres) {
+    cJSON* jparams = cJSON_GetObjectItem(jreq, "params");
+    if (cJSON_GetArraySize(jparams) != 2) {
+        bad_request(jreq, jres);
+        return;
+    }
+    cJSON* jnum1 = cJSON_GetArrayItem(jparams, 0);
+    int num1 = cJSON_GetNumberValue(jnum1);
+    cJSON* jnum2 = cJSON_GetArrayItem(jparams, 1);
+    int num2 = cJSON_GetNumberValue(jnum2);
+    if (num2 == 0) {
+        bad_request(jreq, jres);
+        return;
+    } else {
+        int result = num1 / num2;
+        cJSON_AddItemToObject(jres, "result", cJSON_CreateNumber(result));
+    }
+}
+
+#endif // HV_JSON_RPC_ROUTER_H_

third_party/libhv/examples/jsonrpc/jsonrpc_client.c

@@ -0,0 +1,136 @@
+/*
+ * json rpc client
+ *
+ * @build   make jsonrpc
+ * @server  bin/jsonrpc_server 1234
+ * @client  bin/jsonrpc_client 127.0.0.1 1234 add 1 2
+ *
+ */
+
+#include "hloop.h"
+#include "hatomic.h"
+#include "hbase.h"
+#include "hsocket.h"
+
+#include "cJSON.h"
+
+// hloop_create_tcp_client -> on_connect -> hio_write -> hio_read -> on_recv
+
+static int verbose = 0;
+static unpack_setting_t jsonrpc_unpack_setting;
+
+static void on_close(hio_t* io) {
+    printf("on_close fd=%d error=%d\n", hio_fd(io), hio_error(io));
+    cJSON* jreq = (cJSON*)(hevent_userdata(io));
+    if (jreq) {
+        cJSON_Delete(jreq);
+        hevent_set_userdata(io, NULL);
+    }
+
+    hloop_stop(hevent_loop(io));
+}
+
+static void on_recv(hio_t* io, void* readbuf, int readbytes) {
+    // printf("on_recv fd=%d readbytes=%d\n", hio_fd(io), readbytes);
+    if (verbose) {
+        char localaddrstr[SOCKADDR_STRLEN] = {0};
+        char peeraddrstr[SOCKADDR_STRLEN] = {0};
+        printf("[%s] <=> [%s]\n",
+                SOCKADDR_STR(hio_localaddr(io), localaddrstr),
+                SOCKADDR_STR(hio_peeraddr(io), peeraddrstr));
+    }
+
+    char* resp_str = (char*)readbuf;
+    printf("< %s\n", resp_str);
+    // cJSON_Parse
+    cJSON* jres = cJSON_Parse(resp_str);
+    cJSON* jerror = cJSON_GetObjectItem(jres, "error");
+    cJSON* jresult = cJSON_GetObjectItem(jres, "result");
+    // ...
+    cJSON_Delete(jres);
+
+    hio_close(io);
+}
+
+static void on_connect(hio_t* io) {
+    printf("on_connect fd=%d\n", hio_fd(io));
+    if (verbose) {
+        char localaddrstr[SOCKADDR_STRLEN] = {0};
+        char peeraddrstr[SOCKADDR_STRLEN] = {0};
+        printf("connect connfd=%d [%s] => [%s]\n", hio_fd(io),
+            SOCKADDR_STR(hio_localaddr(io), localaddrstr),
+            SOCKADDR_STR(hio_peeraddr(io), peeraddrstr));
+    }
+
+    hio_setcb_read(io, on_recv);
+    hio_set_unpack(io, &jsonrpc_unpack_setting);
+    hio_read(io);
+
+    cJSON* jreq = (cJSON*)(hevent_userdata(io));
+    hevent_set_userdata(io, NULL);
+    assert(jreq != NULL);
+
+    // cJSON_Print -> hio_write
+    char* req_str = cJSON_PrintUnformatted(jreq);
+    printf("> %s\n", req_str);
+    // NOTE: +1 for \0
+    hio_write(io, req_str, strlen(req_str) + 1);
+
+    cJSON_Delete(jreq);
+    cJSON_free(req_str);
+}
+
+static int jsonrpc_call(hloop_t* loop, const char* host, int port, const char* method, const char* param1, const char* param2) {
+    hio_t* connio = hio_create_socket(loop, host, port, HIO_TYPE_TCP, HIO_CLIENT_SIDE);
+    if (connio == NULL) {
+        return -1;
+    }
+    // printf("connfd=%d\n", hio_fd(connio));
+
+    // construct request
+    cJSON* jreq = cJSON_CreateObject();
+    static hatomic_t s_id = HATOMIC_VAR_INIT(0);
+    cJSON_AddItemToObject(jreq, "id", cJSON_CreateNumber(++s_id));
+    cJSON_AddItemToObject(jreq, "method", cJSON_CreateString(method));
+    cJSON* jparams = cJSON_CreateArray();
+    cJSON_AddItemToArray(jparams, cJSON_CreateNumber(atoi(param1)));
+    cJSON_AddItemToArray(jparams, cJSON_CreateNumber(atoi(param2)));
+    cJSON_AddItemToObject(jreq, "params", jparams);
+    hevent_set_userdata(connio, jreq);
+
+    hio_setcb_connect(connio, on_connect);
+    hio_setcb_close(connio, on_close);
+    hio_connect(connio);
+    return 0;
+}
+
+int main(int argc, char** argv) {
+    if (argc < 6) {
+        printf("Usage: %s host port method param1 param2\n", argv[0]);
+        printf("method = [add, sub, mul, div]\n");
+        printf("Examples:\n");
+        printf("  %s 127.0.0.1 1234 add 1 2\n", argv[0]);
+        printf("  %s 127.0.0.1 1234 div 1 0\n", argv[0]);
+        return -10;
+    }
+    const char* host = argv[1];
+    int port = atoi(argv[2]);
+    const char* method = argv[3];
+    const char* param1 = argv[4];
+    const char* param2 = argv[5];
+
+    // init jsonrpc_unpack_setting
+    memset(&jsonrpc_unpack_setting, 0, sizeof(unpack_setting_t));
+    jsonrpc_unpack_setting.mode = UNPACK_BY_DELIMITER;
+    jsonrpc_unpack_setting.package_max_length = DEFAULT_PACKAGE_MAX_LENGTH;
+    jsonrpc_unpack_setting.delimiter[0] = '\0';
+    jsonrpc_unpack_setting.delimiter_bytes = 1;
+
+    hloop_t* loop = hloop_new(0);
+
+    jsonrpc_call(loop, host, port, method, param1, param2);
+
+    hloop_run(loop);
+    hloop_free(&loop);
+    return 0;
+}

third_party/libhv/examples/jsonrpc/jsonrpc_server.c

@@ -0,0 +1,123 @@
+/*
+ * json rpc server
+ *
+ * @build   make jsonrpc
+ * @server  bin/jsonrpc_server 1234
+ * @client  bin/jsonrpc_client 127.0.0.1 1234 add 1 2
+ *
+ */
+
+#include "hloop.h"
+#include "hbase.h"
+#include "hsocket.h"
+
+#include "cJSON.h"
+#include "router.h"
+#include "handler.h"
+
+// hloop_create_tcp_server -> on_accept -> hio_read -> on_recv -> hio_write
+
+static int verbose = 0;
+static unpack_setting_t jsonrpc_unpack_setting;
+
+jsonrpc_router router[] = {
+    {"add", calc_add},
+    {"sub", calc_sub},
+    {"mul", calc_mul},
+    {"div", calc_div},
+};
+#define JSONRPC_ROUTER_NUM  (sizeof(router)/sizeof(router[0]))
+
+static void on_close(hio_t* io) {
+    printf("on_close fd=%d error=%d\n", hio_fd(io), hio_error(io));
+}
+
+static void on_recv(hio_t* io, void* readbuf, int readbytes) {
+    // printf("on_recv fd=%d readbytes=%d\n", hio_fd(io), readbytes);
+    if (verbose) {
+        char localaddrstr[SOCKADDR_STRLEN] = {0};
+        char peeraddrstr[SOCKADDR_STRLEN] = {0};
+        printf("[%s] <=> [%s]\n",
+                SOCKADDR_STR(hio_localaddr(io), localaddrstr),
+                SOCKADDR_STR(hio_peeraddr(io), peeraddrstr));
+    }
+
+    // cJSON_Parse -> router -> cJSON_Print -> hio_write
+    char* req_str = (char*)readbuf;
+    printf("> %s\n", req_str);
+    cJSON* jreq = cJSON_Parse(req_str);
+    cJSON* jres = cJSON_CreateObject();
+    cJSON* jid = cJSON_GetObjectItem(jreq, "id");
+    cJSON* jmethod = cJSON_GetObjectItem(jreq, "method");
+    if (cJSON_IsNumber(jid)) {
+        long id = cJSON_GetNumberValue(jid);
+        cJSON_AddItemToObject(jres, "id", cJSON_CreateNumber(id));
+    }
+    if (cJSON_IsString(jmethod)) {
+        // router
+        char* method = cJSON_GetStringValue(jmethod);
+        bool found = false;
+        for (int i = 0; i < JSONRPC_ROUTER_NUM; ++i) {
+            if (strcmp(method, router[i].method) == 0) {
+                found = true;
+                router[i].handler(jreq, jres);
+                break;
+            }
+        }
+        if (!found) {
+            not_found(jreq, jres);
+        }
+    } else {
+        bad_request(jreq, jres);
+    }
+
+    char* resp_str = cJSON_PrintUnformatted(jres);
+    printf("< %s\n", resp_str);
+    // NOTE: +1 for \0
+    hio_write(io, resp_str, strlen(resp_str) + 1);
+
+    cJSON_Delete(jreq);
+    cJSON_Delete(jres);
+    cJSON_free(resp_str);
+}
+
+static void on_accept(hio_t* io) {
+    printf("on_accept connfd=%d\n", hio_fd(io));
+    if (verbose) {
+        char localaddrstr[SOCKADDR_STRLEN] = {0};
+        char peeraddrstr[SOCKADDR_STRLEN] = {0};
+        printf("accept connfd=%d [%s] <= [%s]\n", hio_fd(io),
+                SOCKADDR_STR(hio_localaddr(io), localaddrstr),
+                SOCKADDR_STR(hio_peeraddr(io), peeraddrstr));
+    }
+
+    hio_setcb_close(io, on_close);
+    hio_setcb_read(io, on_recv);
+    hio_set_unpack(io, &jsonrpc_unpack_setting);
+    hio_read(io);
+}
+
+int main(int argc, char** argv) {
+    if (argc < 2) {
+        printf("Usage: %s port\n", argv[0]);
+        return -10;
+    }
+    int port = atoi(argv[1]);
+
+    // init jsonrpc_unpack_setting
+    memset(&jsonrpc_unpack_setting, 0, sizeof(unpack_setting_t));
+    jsonrpc_unpack_setting.mode = UNPACK_BY_DELIMITER;
+    jsonrpc_unpack_setting.package_max_length = DEFAULT_PACKAGE_MAX_LENGTH;
+    jsonrpc_unpack_setting.delimiter[0] = '\0';
+    jsonrpc_unpack_setting.delimiter_bytes = 1;
+
+    hloop_t* loop = hloop_new(0);
+    hio_t* listenio = hloop_create_tcp_server(loop, "0.0.0.0", port, on_accept);
+    if (listenio == NULL) {
+        return -20;
+    }
+    printf("listenfd=%d\n", hio_fd(listenio));
+    hloop_run(loop);
+    hloop_free(&loop);
+    return 0;
+}

third_party/libhv/examples/jsonrpc/router.h

@@ -0,0 +1,22 @@
+#ifndef HV_JSON_RPC_ROUTER_H_
+#define HV_JSON_RPC_ROUTER_H_
+
+#include "cJSON.h"
+
+typedef void (*jsonrpc_handler)(cJSON* jreq, cJSON* jres);
+
+typedef struct {
+    const char*     method;
+    jsonrpc_handler handler;
+} jsonrpc_router;
+
+void error_response(cJSON* jres, int code, const char* message);
+void not_found(cJSON* jreq, cJSON* jres);
+void bad_request(cJSON* jreq, cJSON* jres);
+
+void calc_add(cJSON* jreq, cJSON* jres);
+void calc_sub(cJSON* jreq, cJSON* jres);
+void calc_mul(cJSON* jreq, cJSON* jres);
+void calc_div(cJSON* jreq, cJSON* jres);
+
+#endif // HV_JSON_RPC_ROUTER_H_