1 /*
2 *
3 * Copyright 2015 gRPC authors.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 */
18
19 #include <grpc/support/port_platform.h>
20
21 #include "src/core/lib/http/httpcli.h"
22
23 #include <string.h>
24
25 #include <grpc/support/alloc.h>
26 #include <grpc/support/log.h>
27 #include <grpc/support/string_util.h>
28
29 #include "src/core/lib/channel/channel_args.h"
30 #include "src/core/lib/gpr/string.h"
31 #include "src/core/lib/http/format_request.h"
32 #include "src/core/lib/http/parser.h"
33 #include "src/core/lib/iomgr/endpoint.h"
34 #include "src/core/lib/iomgr/iomgr_internal.h"
35 #include "src/core/lib/iomgr/resolve_address.h"
36 #include "src/core/lib/iomgr/sockaddr_utils.h"
37 #include "src/core/lib/iomgr/tcp_client.h"
38 #include "src/core/lib/slice/slice_internal.h"
39
40 typedef struct {
41 grpc_slice request_text;
42 grpc_http_parser parser;
43 grpc_resolved_addresses* addresses;
44 size_t next_address;
45 grpc_endpoint* ep;
46 char* host;
47 char* ssl_host_override;
48 grpc_millis deadline;
49 int have_read_byte;
50 const grpc_httpcli_handshaker* handshaker;
51 grpc_closure* on_done;
52 grpc_httpcli_context* context;
53 grpc_polling_entity* pollent;
54 grpc_iomgr_object iomgr_obj;
55 grpc_slice_buffer incoming;
56 grpc_slice_buffer outgoing;
57 grpc_closure on_read;
58 grpc_closure done_write;
59 grpc_closure connected;
60 grpc_error* overall_error;
61 grpc_resource_quota* resource_quota;
62 } internal_request;
63
64 static grpc_httpcli_get_override g_get_override = nullptr;
65 static grpc_httpcli_post_override g_post_override = nullptr;
66
plaintext_handshake(void * arg,grpc_endpoint * endpoint,const char * host,grpc_millis deadline,void (* on_done)(void * arg,grpc_endpoint * endpoint))67 static void plaintext_handshake(void* arg, grpc_endpoint* endpoint,
68 const char* host, grpc_millis deadline,
69 void (*on_done)(void* arg,
70 grpc_endpoint* endpoint)) {
71 on_done(arg, endpoint);
72 }
73
74 const grpc_httpcli_handshaker grpc_httpcli_plaintext = {"http",
75 plaintext_handshake};
76
grpc_httpcli_context_init(grpc_httpcli_context * context)77 void grpc_httpcli_context_init(grpc_httpcli_context* context) {
78 context->pollset_set = grpc_pollset_set_create();
79 }
80
grpc_httpcli_context_destroy(grpc_httpcli_context * context)81 void grpc_httpcli_context_destroy(grpc_httpcli_context* context) {
82 grpc_pollset_set_destroy(context->pollset_set);
83 }
84
85 static void next_address(internal_request* req, grpc_error* due_to_error);
86
finish(internal_request * req,grpc_error * error)87 static void finish(internal_request* req, grpc_error* error) {
88 grpc_polling_entity_del_from_pollset_set(req->pollent,
89 req->context->pollset_set);
90 GRPC_CLOSURE_SCHED(req->on_done, error);
91 grpc_http_parser_destroy(&req->parser);
92 if (req->addresses != nullptr) {
93 grpc_resolved_addresses_destroy(req->addresses);
94 }
95 if (req->ep != nullptr) {
96 grpc_endpoint_destroy(req->ep);
97 }
98 grpc_slice_unref_internal(req->request_text);
99 gpr_free(req->host);
100 gpr_free(req->ssl_host_override);
101 grpc_iomgr_unregister_object(&req->iomgr_obj);
102 grpc_slice_buffer_destroy_internal(&req->incoming);
103 grpc_slice_buffer_destroy_internal(&req->outgoing);
104 GRPC_ERROR_UNREF(req->overall_error);
105 grpc_resource_quota_unref_internal(req->resource_quota);
106 gpr_free(req);
107 }
108
append_error(internal_request * req,grpc_error * error)109 static void append_error(internal_request* req, grpc_error* error) {
110 if (req->overall_error == GRPC_ERROR_NONE) {
111 req->overall_error =
112 GRPC_ERROR_CREATE_FROM_STATIC_STRING("Failed HTTP/1 client request");
113 }
114 grpc_resolved_address* addr = &req->addresses->addrs[req->next_address - 1];
115 char* addr_text = grpc_sockaddr_to_uri(addr);
116 req->overall_error = grpc_error_add_child(
117 req->overall_error,
118 grpc_error_set_str(error, GRPC_ERROR_STR_TARGET_ADDRESS,
119 grpc_slice_from_copied_string(addr_text)));
120 gpr_free(addr_text);
121 }
122
do_read(internal_request * req)123 static void do_read(internal_request* req) {
124 grpc_endpoint_read(req->ep, &req->incoming, &req->on_read);
125 }
126
on_read(void * user_data,grpc_error * error)127 static void on_read(void* user_data, grpc_error* error) {
128 internal_request* req = static_cast<internal_request*>(user_data);
129 size_t i;
130
131 for (i = 0; i < req->incoming.count; i++) {
132 if (GRPC_SLICE_LENGTH(req->incoming.slices[i])) {
133 req->have_read_byte = 1;
134 grpc_error* err = grpc_http_parser_parse(
135 &req->parser, req->incoming.slices[i], nullptr);
136 if (err != GRPC_ERROR_NONE) {
137 finish(req, err);
138 return;
139 }
140 }
141 }
142
143 if (error == GRPC_ERROR_NONE) {
144 do_read(req);
145 } else if (!req->have_read_byte) {
146 next_address(req, GRPC_ERROR_REF(error));
147 } else {
148 finish(req, grpc_http_parser_eof(&req->parser));
149 }
150 }
151
on_written(internal_request * req)152 static void on_written(internal_request* req) { do_read(req); }
153
done_write(void * arg,grpc_error * error)154 static void done_write(void* arg, grpc_error* error) {
155 internal_request* req = static_cast<internal_request*>(arg);
156 if (error == GRPC_ERROR_NONE) {
157 on_written(req);
158 } else {
159 next_address(req, GRPC_ERROR_REF(error));
160 }
161 }
162
start_write(internal_request * req)163 static void start_write(internal_request* req) {
164 grpc_slice_ref_internal(req->request_text);
165 grpc_slice_buffer_add(&req->outgoing, req->request_text);
166 grpc_endpoint_write(req->ep, &req->outgoing, &req->done_write, nullptr);
167 }
168
on_handshake_done(void * arg,grpc_endpoint * ep)169 static void on_handshake_done(void* arg, grpc_endpoint* ep) {
170 internal_request* req = static_cast<internal_request*>(arg);
171
172 if (!ep) {
173 next_address(req, GRPC_ERROR_CREATE_FROM_STATIC_STRING(
174 "Unexplained handshake failure"));
175 return;
176 }
177
178 req->ep = ep;
179 start_write(req);
180 }
181
on_connected(void * arg,grpc_error * error)182 static void on_connected(void* arg, grpc_error* error) {
183 internal_request* req = static_cast<internal_request*>(arg);
184
185 if (!req->ep) {
186 next_address(req, GRPC_ERROR_REF(error));
187 return;
188 }
189 req->handshaker->handshake(
190 req, req->ep, req->ssl_host_override ? req->ssl_host_override : req->host,
191 req->deadline, on_handshake_done);
192 }
193
next_address(internal_request * req,grpc_error * error)194 static void next_address(internal_request* req, grpc_error* error) {
195 grpc_resolved_address* addr;
196 if (error != GRPC_ERROR_NONE) {
197 append_error(req, error);
198 }
199 if (req->next_address == req->addresses->naddrs) {
200 finish(req,
201 GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING(
202 "Failed HTTP requests to all targets", &req->overall_error, 1));
203 return;
204 }
205 addr = &req->addresses->addrs[req->next_address++];
206 GRPC_CLOSURE_INIT(&req->connected, on_connected, req,
207 grpc_schedule_on_exec_ctx);
208 grpc_arg arg = grpc_channel_arg_pointer_create(
209 (char*)GRPC_ARG_RESOURCE_QUOTA, req->resource_quota,
210 grpc_resource_quota_arg_vtable());
211 grpc_channel_args args = {1, &arg};
212 grpc_tcp_client_connect(&req->connected, &req->ep, req->context->pollset_set,
213 &args, addr, req->deadline);
214 }
215
on_resolved(void * arg,grpc_error * error)216 static void on_resolved(void* arg, grpc_error* error) {
217 internal_request* req = static_cast<internal_request*>(arg);
218 if (error != GRPC_ERROR_NONE) {
219 finish(req, GRPC_ERROR_REF(error));
220 return;
221 }
222 req->next_address = 0;
223 next_address(req, GRPC_ERROR_NONE);
224 }
225
internal_request_begin(grpc_httpcli_context * context,grpc_polling_entity * pollent,grpc_resource_quota * resource_quota,const grpc_httpcli_request * request,grpc_millis deadline,grpc_closure * on_done,grpc_httpcli_response * response,const char * name,grpc_slice request_text)226 static void internal_request_begin(grpc_httpcli_context* context,
227 grpc_polling_entity* pollent,
228 grpc_resource_quota* resource_quota,
229 const grpc_httpcli_request* request,
230 grpc_millis deadline, grpc_closure* on_done,
231 grpc_httpcli_response* response,
232 const char* name, grpc_slice request_text) {
233 internal_request* req =
234 static_cast<internal_request*>(gpr_malloc(sizeof(internal_request)));
235 memset(req, 0, sizeof(*req));
236 req->request_text = request_text;
237 grpc_http_parser_init(&req->parser, GRPC_HTTP_RESPONSE, response);
238 req->on_done = on_done;
239 req->deadline = deadline;
240 req->handshaker =
241 request->handshaker ? request->handshaker : &grpc_httpcli_plaintext;
242 req->context = context;
243 req->pollent = pollent;
244 req->overall_error = GRPC_ERROR_NONE;
245 req->resource_quota = grpc_resource_quota_ref_internal(resource_quota);
246 GRPC_CLOSURE_INIT(&req->on_read, on_read, req, grpc_schedule_on_exec_ctx);
247 GRPC_CLOSURE_INIT(&req->done_write, done_write, req,
248 grpc_schedule_on_exec_ctx);
249 grpc_slice_buffer_init(&req->incoming);
250 grpc_slice_buffer_init(&req->outgoing);
251 grpc_iomgr_register_object(&req->iomgr_obj, name);
252 req->host = gpr_strdup(request->host);
253 req->ssl_host_override = gpr_strdup(request->ssl_host_override);
254
255 GPR_ASSERT(pollent);
256 grpc_polling_entity_add_to_pollset_set(req->pollent,
257 req->context->pollset_set);
258 grpc_resolve_address(
259 request->host, req->handshaker->default_port, req->context->pollset_set,
260 GRPC_CLOSURE_CREATE(on_resolved, req, grpc_schedule_on_exec_ctx),
261 &req->addresses);
262 }
263
grpc_httpcli_get(grpc_httpcli_context * context,grpc_polling_entity * pollent,grpc_resource_quota * resource_quota,const grpc_httpcli_request * request,grpc_millis deadline,grpc_closure * on_done,grpc_httpcli_response * response)264 void grpc_httpcli_get(grpc_httpcli_context* context,
265 grpc_polling_entity* pollent,
266 grpc_resource_quota* resource_quota,
267 const grpc_httpcli_request* request, grpc_millis deadline,
268 grpc_closure* on_done, grpc_httpcli_response* response) {
269 char* name;
270 if (g_get_override && g_get_override(request, deadline, on_done, response)) {
271 return;
272 }
273 gpr_asprintf(&name, "HTTP:GET:%s:%s", request->host, request->http.path);
274 internal_request_begin(context, pollent, resource_quota, request, deadline,
275 on_done, response, name,
276 grpc_httpcli_format_get_request(request));
277 gpr_free(name);
278 }
279
grpc_httpcli_post(grpc_httpcli_context * context,grpc_polling_entity * pollent,grpc_resource_quota * resource_quota,const grpc_httpcli_request * request,const char * body_bytes,size_t body_size,grpc_millis deadline,grpc_closure * on_done,grpc_httpcli_response * response)280 void grpc_httpcli_post(grpc_httpcli_context* context,
281 grpc_polling_entity* pollent,
282 grpc_resource_quota* resource_quota,
283 const grpc_httpcli_request* request,
284 const char* body_bytes, size_t body_size,
285 grpc_millis deadline, grpc_closure* on_done,
286 grpc_httpcli_response* response) {
287 char* name;
288 if (g_post_override && g_post_override(request, body_bytes, body_size,
289 deadline, on_done, response)) {
290 return;
291 }
292 gpr_asprintf(&name, "HTTP:POST:%s:%s", request->host, request->http.path);
293 internal_request_begin(
294 context, pollent, resource_quota, request, deadline, on_done, response,
295 name, grpc_httpcli_format_post_request(request, body_bytes, body_size));
296 gpr_free(name);
297 }
298
grpc_httpcli_set_override(grpc_httpcli_get_override get,grpc_httpcli_post_override post)299 void grpc_httpcli_set_override(grpc_httpcli_get_override get,
300 grpc_httpcli_post_override post) {
301 g_get_override = get;
302 g_post_override = post;
303 }
304