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clean up get_local_fd() to use md5sum()

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git-svn-id: http://s3fs.googlecode.com/svn/trunk@319 df820570-a93a-0410-bd06-b72b767a4274
This commit is contained in:
ben.lemasurier@gmail.com 2011-02-16 16:52:45 +00:00
parent 00bde54d0a
commit cfa0fd2992
2 changed files with 25 additions and 68 deletions
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2
configure.ac
View File

@ -1,7 +1,7 @@
dnl Process this file with autoconf to produce a configure script.
AC_PREREQ(2.59)
AC_INIT(s3fs, 1.44)
AC_INIT(s3fs, 1.45)
AC_CANONICAL_SYSTEM

91
src/s3fs.cpp
View File

@ -282,7 +282,6 @@ MVNODE *add_mvnode(MVNODE *head, char *old_path, char *new_path, bool is_dir) {
void free_mvnodes(MVNODE *head) {
MVNODE *my_head;
MVNODE *next;
char *p_old_path;
@ -490,9 +489,6 @@ void cleanup_multi_stuff(CURLMHLL *mhhead) {
return;
}
static string prepare_url(const char* url) {
if(debug) syslog(LOG_DEBUG, "URL is %s", url);
@ -569,7 +565,6 @@ static void locate_bundle(void) {
return;
}
/**
* @return fuse return code
*/
@ -929,14 +924,9 @@ string calc_signature(
return Signature;
}
// libcurl callback
// another write callback as shown by example
// http://curl.haxx.se/libcurl/c/getinmemory.html
static size_t WriteMemoryCallback(void *ptr, size_t blockSize, size_t numBlocks, void *data) {
size_t realsize = blockSize * numBlocks;
struct BodyStruct *mem = (struct BodyStruct *)data;
@ -957,8 +947,7 @@ static size_t WriteMemoryCallback(void *ptr, size_t blockSize, size_t numBlocks,
// read_callback
// http://curl.haxx.se/libcurl/c/post-callback.html
static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp)
{
static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp) {
struct WriteThis *pooh = (struct WriteThis *)userp;
if(size*nmemb < 1)
@ -974,15 +963,6 @@ static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp)
return 0; /* no more data left to deliver */
}
static size_t header_callback(void *data, size_t blockSize, size_t numBlocks, void *userPtr) {
headers_t* headers = reinterpret_cast<headers_t*>(userPtr);
string header(reinterpret_cast<char*>(data), blockSize * numBlocks);
@ -1026,7 +1006,6 @@ static int mkdirp(const string& path, mode_t mode) {
* TODO return pair<int, headers_t>?!?
*/
int get_headers(const char* path, headers_t& meta) {
CURL *curl;
int result;
@ -1037,13 +1016,14 @@ int get_headers(const char* path, headers_t& meta) {
curl = create_curl_handle();
// curl_easy_setopt(curl, CURLOPT_FAILONERROR, true);
// curl_easy_setopt(curl, CURLOPT_VERBOSE, true);
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, true);
curl_easy_setopt(curl, CURLOPT_NOBODY, true); // HEAD
curl_easy_setopt(curl, CURLOPT_FILETIME, true); // Last-Modified
headers_t responseHeaders;
curl_easy_setopt(curl, CURLOPT_HEADERDATA, &responseHeaders);
curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, header_callback);
curl_easy_setopt(curl, CURLOPT_HEADERDATA, &responseHeaders);
curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, header_callback);
auto_curl_slist headers;
string date = get_date();
@ -1091,24 +1071,20 @@ int get_headers(const char* path, headers_t& meta) {
* get_local_fd
*/
int get_local_fd(const char* path) {
int fd = -1;
int result;
CURL *curl = NULL;
string local_md5;
string resource(urlEncode(service_path + bucket + path));
string url(host + resource);
string baseName = mybasename(path);
string resolved_path(use_cache + "/" + bucket);
string cache_path(resolved_path + path);
headers_t responseHeaders;
if(foreground)
cout << " get_local_fd[path=" << path << "]" << endl;
CURL *curl = NULL;
int result;
string resource(urlEncode(service_path + bucket + path));
string url(host + resource);
string baseName = mybasename(path);
string resolved_path(use_cache + "/" + bucket);
int fd = -1;
string cache_path(resolved_path + path);
headers_t responseHeaders;
if (use_cache.size() > 0) {
result = get_headers(path, responseHeaders);
if(result != 0) {
@ -1118,35 +1094,17 @@ int get_local_fd(const char* path) {
fd = open(cache_path.c_str(), O_RDWR); // ### TODO should really somehow obey flags here
if (fd != -1) {
MD5_CTX c;
if (MD5_Init(&c) != 1) {
YIKES(-EIO);
}
int count;
char buf[1024];
while ((count = read(fd, buf, sizeof(buf))) > 0) {
if (MD5_Update(&c, buf, count) != 1) {
YIKES(-EIO);
}
}
unsigned char md[MD5_DIGEST_LENGTH];
if (MD5_Final(md, &c) != 1) {
YIKES(-EIO);
}
char localMd5[2 * MD5_DIGEST_LENGTH+1];
sprintf(localMd5, "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
md[0], md[1], md[2], md[3], md[4], md[5], md[6], md[7], md[8], md[9], md[10], md[11],
md[12], md[13], md[14], md[15]);
string remoteMd5(trim(responseHeaders["ETag"], "\""));
// md5 match?
if (string(localMd5) != remoteMd5) {
// FIXME: files uploaded via the multipart interface will _not_ have
// and etag representing an md5sum of the object. This breaks the local cache
// for files >= 20MB.
local_md5 = md5sum(cache_path.c_str());
string remoteMd5(trim(responseHeaders["ETag"], "\""));
if(local_md5 != remoteMd5) {
// no! prepare to download
if (close(fd) == -1) {
if(close(fd) == -1)
YIKES(-errno);
}
fd = -1;
}
}
@ -1237,7 +1195,6 @@ static int put_headers(const char* path, headers_t meta) {
if(foreground)
cout << " put_headers[path=" << path << "]" << endl;
body.text = (char *)malloc(1); /* will be grown as needed by the realloc above */
body.size = 0; /* no data at this point */
@ -1306,14 +1263,13 @@ static int put_headers(const char* path, headers_t meta) {
destroy_curl_handle(curl);
if(result != 0) {
return result;
return result;
}
return 0;
}
static int put_local_fd_small_file(const char* path, headers_t meta, int fd) {
struct stat st;
if (fstat(fd, &st) == -1) {
YIKES(-errno);
@ -3107,6 +3063,7 @@ static int s3fs_release(const char *path, struct fuse_file_info *fi) {
YIKES(-errno);
}
// FIXME: is this required?
delete_stat_cache_entry(path);
return 0;