root/src/noit_jlog_listener.c

Revision bd54e8d25218b7d09076b7b541c108a2a68fe992, 5.4 kB (checked in by Theo Schlossnagle <jesus@omniti.com>, 7 years ago)

basic log streamer, need a client to further test it.

  • Property mode set to 100644
Line 
1 /*
2  * Copyright (c) 2007, OmniTI Computer Consulting, Inc.
3  * All rights reserved.
4  */
5
6 #include "noit_defines.h"
7 #include "eventer/eventer.h"
8 #include "noit_listener.h"
9 #include "utils/noit_hash.h"
10 #include "utils/noit_log.h"
11 #include "jlog/jlog.h"
12 #include "noit_jlog_listener.h"
13
14 #include <unistd.h>
15 #include <sys/ioctl.h>
16
17 void
18 noit_jlog_listener_init() {
19   eventer_name_callback("log_transit", noit_jlog_handler);
20 }
21
22 typedef struct {
23   jlog_ctx *jlog;
24   jlog_id chkpt;
25   jlog_id start;
26   jlog_id finish;
27   int count;
28   int wants_shutdown;
29 } noit_jlog_closure_t;
30
31 noit_jlog_closure_t *
32 noit_jlog_closure_alloc(void) {
33   noit_jlog_closure_t *jcl;
34   jcl = calloc(1, sizeof(*jcl));
35   return jcl;
36 }
37
38 void
39 noit_jlog_closure_free(noit_jlog_closure_t *jcl) {
40   if(jcl->jlog) jlog_ctx_close(jcl->jlog);
41   free(jcl);
42 }
43
44 #define Ewrite(a,b) e->opset->write(e->fd, a, b, &mask, e)
45 static int
46 noit_jlog_push(eventer_t e, noit_jlog_closure_t *jcl) {
47   jlog_message msg;
48   int mask;
49   u_int32_t n_count;
50   n_count = htonl(jcl->count);
51   if(Ewrite(&n_count, sizeof(n_count)) != sizeof(n_count))
52     return -1;
53   while(jcl->count > 0) {
54     struct { u_int32_t n_sec, n_usec, n_len; } payload;
55     if(jlog_ctx_read_message(jcl->jlog, &jcl->start, &msg) == -1)
56       return -1;
57
58     /* Here we actually push the message */
59     payload.n_sec  = htonl(msg.header->tv_sec);
60     payload.n_usec = htonl(msg.header->tv_usec);
61     payload.n_len  = htonl(msg.mess_len);
62     if(Ewrite(&payload, sizeof(payload)) != sizeof(payload))
63       return -1;
64     if(Ewrite(msg.mess, msg.mess_len) != msg.mess_len)
65       return -1;
66     /* Note what the client must checkpoint */
67     jcl->chkpt = jcl->start;
68
69     JLOG_ID_ADVANCE(&jcl->start);
70     jcl->count--;
71   }
72   return 0;
73 }
74
75 void *
76 noit_jlog_thread_main(void *e_vptr) {
77   int mask, bytes_read;
78   eventer_t e = e_vptr;
79   acceptor_closure_t *ac = e->closure;
80   noit_jlog_closure_t *jcl = ac->service_ctx;
81   long off = 0;
82   char inbuff[sizeof(jlog_id)];
83
84   /* Go into blocking mode */
85   ioctl(e->fd, FIONBIO, &off);
86
87   while(1) {
88     jlog_id client_chkpt;
89     jlog_get_checkpoint(jcl->jlog, ac->remote_cn, &jcl->chkpt);
90     jcl->count = jlog_ctx_read_interval(jcl->jlog, &jcl->start, &jcl->finish);
91     if(jcl->count > 0) {
92       if(noit_jlog_push(e, jcl)) {
93         goto alldone;
94       }
95       /* Read our jlog_id accounting for possibly short reads */
96       bytes_read = 0;
97       while(bytes_read < sizeof(jlog_id)) {
98         int len;
99         if((len = e->opset->read(e->fd, inbuff + bytes_read,
100                                  sizeof(jlog_id) - bytes_read,
101                                  &mask, e)) <= 0)
102           goto alldone;
103         bytes_read += len;
104       }
105       memcpy(&client_chkpt, inbuff, sizeof(jlog_id));
106       /* Fix the endian */
107       client_chkpt.log = ntohl(client_chkpt.log);
108       client_chkpt.marker = ntohl(client_chkpt.marker);
109  
110       if(memcmp(&jcl->chkpt, &client_chkpt, sizeof(jlog_id))) {
111         noitL(noit_error,
112               "client %s submitted invalid checkpoint %u:%u expected %u:%u\n",
113               ac->remote_cn, client_chkpt.log, client_chkpt.marker,
114               jcl->chkpt.log, jcl->chkpt.marker);
115         goto alldone;
116       }
117       jlog_ctx_read_checkpoint(jcl->jlog, &jcl->chkpt);
118     }
119     sleep(5);
120   }
121
122  alldone:
123   e->opset->close(e->fd, &mask, e);
124   if(jcl) noit_jlog_closure_free(jcl);
125   if(ac) acceptor_closure_free(ac);
126   return NULL;
127 }
128
129 int
130 noit_jlog_handler(eventer_t e, int mask, void *closure,
131                      struct timeval *now) {
132   eventer_t newe;
133   pthread_t tid;
134   int newmask = EVENTER_READ | EVENTER_EXCEPTION;
135   acceptor_closure_t *ac = closure;
136   noit_jlog_closure_t *jcl = ac->service_ctx;
137
138   if(mask & EVENTER_EXCEPTION || (jcl && jcl->wants_shutdown)) {
139 socket_error:
140     /* Exceptions cause us to simply snip the connection */
141     eventer_remove_fd(e->fd);
142     e->opset->close(e->fd, &newmask, e);
143     if(jcl) noit_jlog_closure_free(jcl);
144     if(ac) acceptor_closure_free(ac);
145     return 0;
146   }
147
148   if(!ac->service_ctx) {
149     noit_log_stream_t ls;
150     const char *logname;
151     jcl = ac->service_ctx = noit_jlog_closure_alloc();
152     if(!noit_hash_retrieve(ac->config, "log", strlen("log"),
153                            (void **)&logname)) {
154       noitL(noit_error, "No 'log' specified in log_transit.\n");
155       goto socket_error;
156     }
157     ls = noit_log_stream_find(logname);
158     if(!ls) {
159       noitL(noit_error, "Could not find log '%s' for log_transit.\n",
160             logname);
161       goto socket_error;
162     }
163     if(!ls->type || strcmp(ls->type, "jlog")) {
164       noitL(noit_error, "Log '%s' for log_transit is not a jlog.\n",
165             logname);
166       goto socket_error;
167     }
168     if(!ac->remote_cn) {
169       noitL(noit_error, "jlog transit started to unidentified party.\n");
170       goto socket_error;
171     }
172
173     jcl->jlog = jlog_new(ls->path);
174     if(jlog_ctx_open_reader(jcl->jlog, ac->remote_cn) == -1) {
175       noitL(noit_error, "jlog reader[%s] error: %s\n", ac->remote_cn,
176             jlog_ctx_err_string(jcl->jlog));
177       goto socket_error;
178     }
179   }
180
181   /* The jlog stuff is disk I/O and can block us.
182    * We'll create a new thread to just handle this connection.
183    */
184   eventer_remove_fd(e->fd);
185   newe = eventer_alloc();
186   memcpy(newe, e, sizeof(*e));
187   if(pthread_create(&tid, NULL, noit_jlog_thread_main, newe) == 0) {
188     return 0;
189   }
190
191   /* Undo our dup */
192   eventer_free(newe);
193   /* Creating the thread failed, close it down and deschedule. */
194   e->opset->close(e->fd, &newmask, e);
195   return 0;
196 }
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