| /* |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /* cache-key-genid.c - Plugin to modify the URL used as a cache key for |
| * requests, without modifying the URL used for actually fetching data from |
| * the origin server. |
| */ |
| |
| #include <ts/ts.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <kclangc.h> |
| |
| #define PLUGIN_NAME "cache-key-genid" |
| |
| static char genid_kyoto_db[PATH_MAX + 1]; |
| |
| // Find the host in url and set host to it |
| static void |
| get_genid_host(char **host, char *url) |
| { |
| char *pt1; |
| char *pt2; |
| size_t host_len; |
| unsigned num = 1; |
| |
| pt1 = strstr(url, "//"); |
| |
| if (pt1) { |
| pt1 = pt1 + 2; |
| pt2 = strstr(pt1, "/"); |
| } |
| |
| if (pt1 && pt2 && pt2 > pt1) { |
| host_len = pt2 - pt1; |
| *host = calloc(num, host_len + 1); |
| strncpy(*host, pt1, host_len); |
| } |
| } |
| |
| /* get_genid |
| * Looks up the host's genid in the host->genid database |
| */ |
| static int |
| get_genid(char *host) |
| { |
| KCDB *db; |
| char *vbuf; |
| size_t vsiz; |
| int answer = 0; |
| int host_size; |
| |
| /* create the database object */ |
| db = kcdbnew(); |
| |
| /* open the database */ |
| if (!kcdbopen(db, genid_kyoto_db, KCOREADER | KCONOLOCK)) { |
| TSDebug(PLUGIN_NAME, "could not open the genid database %s", genid_kyoto_db); |
| TSError("[%s] could not open the genid database %s: %s", PLUGIN_NAME, genid_kyoto_db, strerror(errno)); |
| return 0; |
| } |
| |
| vbuf = kcdbget(db, host, strlen(host), &vsiz); |
| |
| if (vbuf) { |
| TSDebug(PLUGIN_NAME, "kcdbget(%s) = %s", host, vbuf); |
| answer = (int)strtol(vbuf, NULL, 10); |
| kcfree(vbuf); |
| } else { |
| host_size = strlen(host); |
| TSDebug(PLUGIN_NAME, "kcdbget(%s) - no record found, len(%d)", host, host_size); |
| answer = 0; |
| } |
| |
| kcdbclose(db); |
| return answer; |
| } |
| |
| /* handle_hook |
| * Fires on TS_EVENT_HTTP_READ_REQUEST_HDR events, gets the effectiveUrl |
| * finds the host, gets the generation ID, gen_id, for the host |
| * and runs TSCacheUrlSet to change the cache key for the read |
| */ |
| static int |
| handle_hook(TSCont *contp, TSEvent event, void *edata) |
| { |
| TSHttpTxn txnp = (TSHttpTxn)edata; |
| char *url = NULL, *host = NULL; |
| int url_length; |
| int gen_id; |
| int ok = 1; |
| |
| switch (event) { |
| case TS_EVENT_HTTP_READ_REQUEST_HDR: |
| TSDebug(PLUGIN_NAME, "handling TS_EVENT_HTTP_READ_REQUEST_HDR"); |
| |
| if (ok) { |
| url = TSHttpTxnEffectiveUrlStringGet(txnp, &url_length); |
| if (!url) { |
| TSError("[%s] could not retrieve request url", PLUGIN_NAME); |
| ok = 0; |
| } |
| } |
| |
| if (ok) { |
| get_genid_host(&host, url); |
| if (!host) { |
| TSError("[%s] could not retrieve request host", PLUGIN_NAME); |
| ok = 0; |
| } |
| } |
| |
| if (ok) { |
| TSDebug(PLUGIN_NAME, "From url (%s) discovered host (%s)", url, host); |
| if ((gen_id = get_genid(host)) != 0) { |
| if (TSHttpTxnConfigIntSet(txnp, TS_CONFIG_HTTP_CACHE_GENERATION, gen_id) != TS_SUCCESS) { |
| TSDebug(PLUGIN_NAME, "Error, unable to modify cache url"); |
| TSError("[%s] Unable to set cache generation for %s to %d", PLUGIN_NAME, url, gen_id); |
| ok = 0; |
| } |
| } |
| } |
| |
| /* Clean up */ |
| if (url) { |
| TSfree(url); |
| } |
| if (host) { |
| TSfree(host); |
| } |
| TSHttpTxnReenable(txnp, TS_EVENT_HTTP_CONTINUE); |
| break; |
| |
| default: |
| TSAssert(!"Unexpected event"); |
| ok = 0; |
| break; |
| } |
| |
| return ok; |
| } |
| |
| void |
| TSPluginInit(int argc, const char *argv[]) |
| { |
| TSPluginRegistrationInfo info; |
| |
| info.plugin_name = (char *)PLUGIN_NAME; |
| info.vendor_name = (char *)"Apache Software Foundation"; |
| info.support_email = (char *)"dev@trafficserver.apache.org"; |
| |
| if (argc > 1) { |
| TSstrlcpy(genid_kyoto_db, argv[1], sizeof(genid_kyoto_db)); |
| } else { |
| TSError("[%s] plugin registration failed. check argv[1] for db path", PLUGIN_NAME); |
| return; |
| } |
| |
| if (TSPluginRegister(&info) != TS_SUCCESS) { |
| TSError("[%s] plugin registration failed, check version", PLUGIN_NAME); |
| return; |
| } |
| |
| TSHttpHookAdd(TS_HTTP_READ_REQUEST_HDR_HOOK, TSContCreate((TSEventFunc)handle_hook, NULL)); |
| } |