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service_package.c
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service_package.c
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#include "skynet.h"
#include "skynet_socket.h"
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <assert.h>
#define TIMEOUT "1000" // 10s
struct response {
size_t sz;
void * msg;
};
struct request {
uint32_t source;
int session;
};
struct queue {
int cap;
int sz;
int head;
int tail;
char * buffer;
};
struct package {
uint32_t manager;
int fd;
int heartbeat;
int recv;
int init;
int closed;
int header_sz;
uint8_t header[2];
int uncomplete_sz;
struct response uncomplete;
struct queue request;
struct queue response;
};
static void
queue_init(struct queue *q, int sz) {
q->head = 0;
q->tail = 0;
q->sz = sz;
q->cap = 4;
q->buffer = skynet_malloc(q->cap * q->sz);
}
static void
queue_exit(struct queue *q) {
skynet_free(q->buffer);
q->buffer = NULL;
}
static int
queue_empty(struct queue *q) {
return q->head == q->tail;
}
static int
queue_pop(struct queue *q, void *result) {
if (q->head == q->tail) {
return 1;
}
memcpy(result, q->buffer + q->head * q->sz, q->sz);
q->head++;
if (q->head >= q->cap)
q->head = 0;
return 0;
}
static void
queue_push(struct queue *q, const void *value) {
void * slot = q->buffer + q->tail * q->sz;
++q->tail;
if (q->tail >= q->cap)
q->tail = 0;
if (q->head == q->tail) {
// full
assert(q->sz > 0);
int cap = q->cap * 2;
char * tmp = skynet_malloc(cap * q->sz);
int i;
int head = q->head;
for (i=0;i<q->cap;i++) {
memcpy(tmp + i * q->sz, q->buffer + head * q->sz, q->sz);
++head;
if (head >= q->cap) {
head = 0;
}
}
skynet_free(q->buffer);
q->head = 0;
slot = tmp + (q->cap-1) * q->sz;
q->tail = q->cap;
q->cap = cap;
q->buffer = tmp;
}
memcpy(slot, value, q->sz);
}
static int
queue_size(struct queue *q) {
if (q->head > q->tail) {
return q->tail + q->cap - q->head;
}
return q->tail - q->head;
}
static void
service_exit(struct skynet_context *ctx, struct package *P) {
// report manager
P->closed = 1;
while (!queue_empty(&P->request)) {
struct request req;
queue_pop(&P->request, &req);
skynet_send(ctx, 0, req.source, PTYPE_ERROR, req.session, NULL, 0);
}
// free unsend response buffer on package_release
skynet_send(ctx, 0, P->manager, PTYPE_TEXT, 0, "CLOSED", 6);
skynet_command(ctx, "EXIT", NULL);
}
static void
report_info(struct skynet_context *ctx, struct package *P, int session, uint32_t source) {
int uncomplete;
int uncomplete_sz;
if (P->header_sz != 0) {
uncomplete = -1;
uncomplete_sz = 0;
} else if (P->uncomplete_sz == 0) {
uncomplete = 0;
uncomplete_sz = 0;
} else {
uncomplete = P->uncomplete_sz;
uncomplete_sz = P->uncomplete.sz;
}
char tmp[128];
int n = sprintf(tmp,"req=%d resp=%d uncomplete=%d/%d", queue_size(&P->request), queue_size(&P->response),uncomplete,uncomplete_sz);
skynet_send(ctx, 0, source, PTYPE_RESPONSE, session, tmp, n);
}
static void
command(struct skynet_context *ctx, struct package *P, int session, uint32_t source, const char *msg, size_t sz) {
switch (msg[0]) {
case 'R':
// request a package
if (P->closed) {
skynet_send(ctx, 0, source, PTYPE_ERROR, session, NULL, 0);
break;
}
if (!queue_empty(&P->response)) {
assert(queue_empty(&P->request));
struct response resp;
queue_pop(&P->response, &resp);
skynet_send(ctx, 0, source, PTYPE_RESPONSE | PTYPE_TAG_DONTCOPY, session, resp.msg, resp.sz);
} else {
struct request req;
req.source = source;
req.session = session;
queue_push(&P->request, &req);
}
break;
case 'K':
// shutdown the connection
skynet_socket_shutdown(ctx, P->fd);
break;
case 'I':
report_info(ctx, P, session, source);
break;
default:
// invalid command
skynet_error(ctx, "Invalid command %.*s", (int)sz, msg);
skynet_send(ctx, 0, source, PTYPE_ERROR, session, NULL, 0);
break;
};
}
static void
new_message(struct package *P, const uint8_t *msg, int sz) {
++P->recv;
for (;;) {
if (P->uncomplete_sz >= 0) {
if (sz >= P->uncomplete_sz) {
memcpy(P->uncomplete.msg + P->uncomplete.sz - P->uncomplete_sz, msg, P->uncomplete_sz);
msg += P->uncomplete_sz;
sz -= P->uncomplete_sz;
queue_push(&P->response, &P->uncomplete);
P->uncomplete_sz = -1;
} else {
memcpy(P->uncomplete.msg + P->uncomplete.sz - P->uncomplete_sz, msg, sz);
P->uncomplete_sz -= sz;
return;
}
}
if (sz <= 0)
return;
if (P->header_sz == 0) {
if (sz == 1) {
P->header[0] = msg[0];
P->header_sz = 1;
return;
}
P->header[0] = msg[0];
P->header[1] = msg[1];
msg+=2;
sz-=2;
} else {
assert(P->header_sz == 1);
P->header[1] = msg[0];
P->header_sz = 0;
++msg;
--sz;
}
P->uncomplete.sz = P->header[0] * 256 + P->header[1];
P->uncomplete.msg = skynet_malloc(P->uncomplete.sz);
P->uncomplete_sz = P->uncomplete.sz;
}
}
static void
response(struct skynet_context *ctx, struct package *P) {
while (!queue_empty(&P->request)) {
if (queue_empty(&P->response)) {
break;
}
struct request req;
struct response resp;
queue_pop(&P->request, &req);
queue_pop(&P->response, &resp);
skynet_send(ctx, 0, req.source, PTYPE_RESPONSE | PTYPE_TAG_DONTCOPY, req.session, resp.msg, resp.sz);
}
}
static void
socket_message(struct skynet_context *ctx, struct package *P, const struct skynet_socket_message * smsg) {
switch (smsg->type) {
case SKYNET_SOCKET_TYPE_CONNECT:
if (P->init == 0 && smsg->id == P->fd) {
skynet_send(ctx, 0, P->manager, PTYPE_TEXT, 0, "SUCC", 4);
P->init = 1;
}
break;
case SKYNET_SOCKET_TYPE_CLOSE:
case SKYNET_SOCKET_TYPE_ERROR:
if (P->init == 0 && smsg->id == P->fd) {
skynet_send(ctx, 0, P->manager, PTYPE_TEXT, 0, "FAIL", 4);
P->init = 1;
}
if (smsg->id != P->fd) {
skynet_error(ctx, "Invalid fd (%d), should be (%d)", smsg->id, P->fd);
} else {
// todo: log when SKYNET_SOCKET_TYPE_ERROR
response(ctx, P);
service_exit(ctx, P);
}
break;
case SKYNET_SOCKET_TYPE_DATA:
new_message(P, (const uint8_t *)smsg->buffer, smsg->ud);
skynet_free(smsg->buffer);
response(ctx, P);
break;
case SKYNET_SOCKET_TYPE_WARNING:
skynet_error(ctx, "Overload on %d", P->fd);
break;
default:
// ignore
break;
}
}
static void
heartbeat(struct skynet_context *ctx, struct package *P) {
if (P->recv == P->heartbeat) {
if (!P->closed) {
skynet_socket_shutdown(ctx, P->fd);
skynet_error(ctx, "timeout %d", P->fd);
}
} else {
P->heartbeat = P->recv = 0;
skynet_command(ctx, "TIMEOUT", TIMEOUT);
}
}
static void
send_out(struct skynet_context *ctx, struct package *P, const void *msg, size_t sz) {
if (sz > 0xffff) {
skynet_error(ctx, "package too long (%08x)", (uint32_t)sz);
return;
}
uint8_t *p = skynet_malloc(sz + 2);
p[0] = (sz & 0xff00) >> 8;
p[1] = sz & 0xff;
memcpy(p+2, msg, sz);
skynet_socket_send(ctx, P->fd, p, sz+2);
}
static int
message_handler(struct skynet_context * ctx, void *ud, int type, int session, uint32_t source, const void * msg, size_t sz) {
struct package *P = ud;
switch (type) {
case PTYPE_TEXT:
command(ctx, P, session, source, msg, sz);
break;
case PTYPE_CLIENT:
send_out(ctx, P, msg, sz);
break;
case PTYPE_RESPONSE:
// It's timer
heartbeat(ctx, P);
break;
case PTYPE_SOCKET:
socket_message(ctx, P, msg);
break;
case PTYPE_ERROR:
// ignore error
break;
default:
if (session > 0) {
// unsupport type, raise error
skynet_send(ctx, 0, source, PTYPE_ERROR, session, NULL, 0);
}
break;
}
return 0;
}
struct package *
package_create(void) {
struct package * P = skynet_malloc(sizeof(*P));
memset(P, 0, sizeof(*P));
P->heartbeat = -1;
P->uncomplete_sz = -1;
queue_init(&P->request, sizeof(struct request));
queue_init(&P->response, sizeof(struct response));
return P;
}
void
package_release(struct package *P) {
while (!queue_empty(&P->response)) {
// drop the message
struct response resp;
queue_pop(&P->response, &resp);
skynet_free(resp.msg);
}
if (P->uncomplete_sz >= 0)
skynet_free(P->uncomplete.msg);
queue_exit(&P->request);
queue_exit(&P->response);
skynet_free(P);
}
int
package_init(struct package * P, struct skynet_context *ctx, const char * param) {
int n = sscanf(param ? param : "", "%u %d", &P->manager, &P->fd);
if (n != 2 || P->manager == 0 || P->fd == 0) {
skynet_error(ctx, "Invalid param [%s]", param);
return 1;
}
skynet_socket_start(ctx, P->fd);
skynet_socket_nodelay(ctx, P->fd);
heartbeat(ctx, P);
skynet_callback(ctx, P, message_handler);
return 0;
}