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- Ravi Pratap provided work on libcurl making pipelining more robust and

Browse Source 
fixing some bugs:
  o Don't mix GET and POST requests in a pipeline
  o Fix the order in which requests are dispatched from the pipeline
  o Fixed several curl bugs with pipelining when the server is returning
    chunked encoding:
    * Added states to chunked parsing for final CRLF
    * Rewind buffer after parsing chunk with data remaining
    * Moved chunked header initializing to a spot just before receiving
      headers
This commit is contained in:
Daniel Stenberg 2007-02-21 21:59:40 +00:00
parent 3a634a273a
commit f19d333ef6
9 changed files with 182 additions and 49 deletions
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17
CHANGES
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@ -6,6 +6,23 @@
Changelog
Daniel (21 February 2007)
- Ravi Pratap provided work on libcurl making pipelining more robust and
fixing some bugs:
o Don't mix GET and POST requests in a pipeline
o Fix the order in which requests are dispatched from the pipeline
o Fixed several curl bugs with pipelining when the server is returning
chunked encoding:
* Added states to chunked parsing for final CRLF
* Rewind buffer after parsing chunk with data remaining
* Moved chunked header initializing to a spot just before receiving
headers
Daniel (20 February 2007)
- Linus Nielsen Feltzing changed the CURLOPT_FTP_SSL_CCC option to handle
active and passive CCC shutdown and added the --ftp-ssl-ccc-mode command
line option.
Daniel (19 February 2007)
- Ian Turner fixed the libcurl.m4 macro's support for --with-libcurl.

6
RELEASE-NOTES
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@ -2,7 +2,7 @@ Curl and libcurl 7.16.2
Public curl release number: 98
Releases counted from the very beginning: 125
Available command line options: 116
Available command line options: 117
Available curl_easy_setopt() options: 141
Number of public functions in libcurl: 54
Amount of public web site mirrors: 39
@ -32,6 +32,7 @@ This release includes the following bugfixes:
o libcurl.m4's --with-libcurl is improved
o curl-config --libs and libcurl.pc no longer list unnecessary dependencies
o fixed an issue with CCC not working on some servers
o several HTTP pipelining problems
This release includes the following known bugs:
@ -50,6 +51,7 @@ advice from friends like these:
Yang Tse, Manfred Schwarb, Michael Wallner, Jeff Pohlmeyer, Shmulik Regev,
Rob Crittenden, Robert A. Monat, Dan Fandrich, Duncan Mac-Vicar Prett,
Michal Marek, Robson Braga Araujo, Ian Turner
Michal Marek, Robson Braga Araujo, Ian Turner, Linus Nielsen Feltzing,
Ravi Pratap
Thanks! (and sorry if I forgot to mention someone)

62
lib/http_chunks.c
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@ -181,20 +181,25 @@ CHUNKcode Curl_httpchunk_read(struct connectdata *conn,
if(0 == ch->datasize) {
if (conn->bits.trailerHdrPresent!=TRUE) {
/* No Trailer: header found - revert to original Curl processing */
ch->state = CHUNK_STOP;
if (1 == length) {
/* This is the final byte, return right now */
return CHUNKE_STOP;
}
ch->state = CHUNK_STOPCR;
/* We need to increment the datap here since we bypass the
increment below with the immediate break */
length--;
datap++;
/* This is the final byte, continue to read the final CRLF */
break;
}
else {
ch->state = CHUNK_TRAILER; /* attempt to read trailers */
conn->trlPos=0;
}
}
else
else {
ch->state = CHUNK_DATA;
}
}
else
/* previously we got a fake CR, go back to CR waiting! */
ch->state = CHUNK_CR;
@ -270,8 +275,9 @@ CHUNKcode Curl_httpchunk_read(struct connectdata *conn,
datap++;
length--;
}
else
else {
return CHUNKE_BAD_CHUNK;
}
break;
case CHUNK_POSTLF:
@ -284,8 +290,10 @@ CHUNKcode Curl_httpchunk_read(struct connectdata *conn,
datap++;
length--;
}
else
else {
return CHUNKE_BAD_CHUNK;
}
break;
case CHUNK_TRAILER:
@ -331,7 +339,17 @@ CHUNKcode Curl_httpchunk_read(struct connectdata *conn,
conn->trailer[conn->trlPos]=0;
if (conn->trlPos==2) {
ch->state = CHUNK_STOP;
return CHUNKE_STOP;
datap++;
length--;
/*
* Note that this case skips over the final STOP states since we've
* already read the final CRLF and need to return
*/
ch->dataleft = length;
return CHUNKE_STOP; /* return stop */
}
else {
#ifdef CURL_DOES_CONVERSIONS
@ -358,11 +376,35 @@ CHUNKcode Curl_httpchunk_read(struct connectdata *conn,
return CHUNKE_BAD_CHUNK;
break;
case CHUNK_STOPCR:
/* Read the final CRLF that ends all chunk bodies */
if(*datap == 0x0d) {
ch->state = CHUNK_STOP;
datap++;
length--;
}
else {
return CHUNKE_BAD_CHUNK;
}
break;
case CHUNK_STOP:
/* If we arrive here, there is data left in the end of the buffer
if (*datap == 0x0a) {
datap++;
length--;
/* Record the length of any data left in the end of the buffer
even if there's no more chunks to read */
ch->dataleft = length;
return CHUNKE_STOP; /* return stop */
}
else {
return CHUNKE_BAD_CHUNK;
}
break;
default:
return CHUNKE_STATE_ERROR;
}

6
lib/http_chunks.h
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@ -7,7 +7,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2005, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1998 - 2007, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
@ -56,6 +56,10 @@ typedef enum {
CRLF combination marks the end of a chunk */
CHUNK_POSTLF,
/* Each Chunk body should end with a CRLF. Read a CR and nothing else,
then move to CHUNK_STOP */
CHUNK_STOPCR,
/* This is mainly used to really mark that we're out of the game.
NOTE: that there's a 'dataleft' field in the struct that will tell how
many bytes that were not passed to the client in the end of the last

40
lib/multi.c
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@ -354,6 +354,12 @@ CURLM *curl_multi_init(void)
return NULL;
}
/* Let's make the doubly-linked list a circular list. This makes
the linked list code simpler and allows inserting at the end
with less work (we didn't keep a tail pointer before). */
multi->easy.next = &multi->easy;
multi->easy.prev = &multi->easy;
return (CURLM *) multi;
}
@ -435,18 +441,21 @@ CURLMcode curl_multi_add_handle(CURLM *multi_handle,
/* Make sure the type is setup correctly */
easy->easy_handle->state.connc->type = CONNCACHE_MULTI;
/* We add this new entry first in the list. We make our 'next' point to the
previous next and our 'prev' point back to the 'first' struct */
easy->next = multi->easy.next;
easy->prev = &multi->easy;
/* This adds the new entry at the back of the list
to try and maintain a FIFO queue so the pipelined
requests are in order. */
/* make 'easy' the first node in the chain */
multi->easy.next = easy;
/* We add this new entry last in the list. We make our 'next' point to the
'first' struct and our 'prev' point to the previous 'prev' */
easy->next = &multi->easy;
easy->prev = multi->easy.prev;
/* if there was a next node, make sure its 'prev' pointer links back to
/* make 'easy' the last node in the chain */
multi->easy.prev = easy;
/* if there was a prev node, make sure its 'next' pointer links to
the new node */
if(easy->next)
easy->next->prev = easy;
easy->prev->next = easy;
Curl_easy_addmulti(easy_handle, multi_handle);
@ -506,7 +515,7 @@ CURLMcode curl_multi_remove_handle(CURLM *multi_handle,
/* scan through the list and remove the 'curl_handle' */
easy = multi->easy.next;
while(easy) {
while(easy != &multi->easy) {
if(easy->easy_handle == (struct SessionHandle *)curl_handle)
break;
easy=easy->next;
@ -726,7 +735,7 @@ CURLMcode curl_multi_fdset(CURLM *multi_handle,
return CURLM_BAD_HANDLE;
easy=multi->easy.next;
while(easy) {
while(easy != &multi->easy) {
bitmap = multi_getsock(easy, sockbunch, MAX_SOCKSPEREASYHANDLE);
for(i=0; i< MAX_SOCKSPEREASYHANDLE; i++) {
@ -1092,6 +1101,9 @@ static CURLMcode multi_runsingle(struct Curl_multi *multi,
easy->easy_conn->recv_pipe);
multistate(easy, CURLM_STATE_WAITPERFORM);
result = CURLM_CALL_MULTI_PERFORM;
Curl_pre_readwrite(easy->easy_conn);
break;
case CURLM_STATE_WAITPERFORM:
@ -1313,7 +1325,7 @@ CURLMcode curl_multi_perform(CURLM *multi_handle, int *running_handles)
return CURLM_BAD_HANDLE;
easy=multi->easy.next;
while(easy) {
while(easy != &multi->easy) {
CURLMcode result;
if (easy->easy_handle->state.cancelled &&
@ -1409,7 +1421,7 @@ CURLMcode curl_multi_cleanup(CURLM *multi_handle)
/* remove all easy handles */
easy = multi->easy.next;
while(easy) {
while(easy != &multi->easy) {
nexteasy=easy->next;
if(easy->easy_handle->dns.hostcachetype == HCACHE_MULTI) {
/* clear out the usage of the shared DNS cache */
@ -1588,7 +1600,7 @@ static CURLMcode multi_socket(struct Curl_multi *multi,
/* walk through each easy handle and do the socket state change magic
and callbacks */
easyp=multi->easy.next;
while(easyp) {
while(easyp != &multi->easy) {
singlesocket(multi, easyp);
easyp = easyp->next;
}

45
lib/transfer.c
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@ -1214,11 +1214,11 @@ CURLcode Curl_readwrite(struct connectdata *conn,
#ifndef CURL_DISABLE_HTTP
if(conn->bits.chunk) {
/*
* Bless me father for I have sinned. Here comes a chunked
* transfer flying and we need to decode this properly. While
* the name says read, this function both reads and writes away
* the data. The returned 'nread' holds the number of actual
* data it wrote to the client. */
* Here comes a chunked transfer flying and we need to decode this
* properly. While the name says read, this function both reads
* and writes away the data. The returned 'nread' holds the number
* of actual data it wrote to the client.
*/
CHUNKcode res =
Curl_httpchunk_read(conn, k->str, nread, &nread);
@ -1232,12 +1232,22 @@ CURLcode Curl_readwrite(struct connectdata *conn,
return CURLE_RECV_ERROR;
}
else if(CHUNKE_STOP == res) {
size_t dataleft;
/* we're done reading chunks! */
k->keepon &= ~KEEP_READ; /* read no more */
/* There are now possibly N number of bytes at the end of the
str buffer that weren't written to the client, but we don't
care about them right now. */
str buffer that weren't written to the client.
We DO care about this data if we are pipelining.
Push it back to be read on the next pass. */
dataleft = data->reqdata.proto.http->chunk.dataleft;
if (dataleft != 0) {
infof(conn->data, "Leftovers after chunking. "
" Rewinding %d bytes\n",dataleft);
read_rewind(conn, dataleft);
}
}
/* If it returned OK, we just keep going */
}
@ -1691,6 +1701,23 @@ CURLcode Curl_readwrite_init(struct connectdata *conn)
return CURLE_OK;
}
/*
* Curl_readwrite may get called multiple times. This function is called
* immediately before the first Curl_readwrite. Note that this can't be moved
* to Curl_readwrite_init since that function can get called while another
* pipeline request is in the middle of receiving data.
*
* We init chunking and trailer bits to their default values here immediately
* before receiving any header data for the current request in the pipeline.
*/
void Curl_pre_readwrite(struct connectdata *conn)
{
DEBUGF(infof(conn->data, "Pre readwrite setting chunky header "
"values to default\n"));
conn->bits.chunk=FALSE;
conn->bits.trailerHdrPresent=FALSE;
}
/*
* Curl_single_getsock() gets called by the multi interface code when the app
* has requested to get the sockets for the current connection. This function
@ -1756,10 +1783,12 @@ Transfer(struct connectdata *conn)
struct Curl_transfer_keeper *k = &data->reqdata.keep;
bool done=FALSE;
if(!(conn->protocol & PROT_FILE))
if(!(conn->protocol & PROT_FILE)) {
/* Only do this if we are not transferring FILE:, since the file: treatment
is different*/
Curl_readwrite_init(conn);
Curl_pre_readwrite(conn);
}
if((conn->sockfd == CURL_SOCKET_BAD) &&
(conn->writesockfd == CURL_SOCKET_BAD))

1
lib/transfer.h
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@ -32,6 +32,7 @@ int Curl_single_getsock(struct connectdata *conn,
curl_socket_t *socks,
int numsocks);
CURLcode Curl_readwrite_init(struct connectdata *conn);
void Curl_pre_readwrite(struct connectdata *conn);
CURLcode Curl_readrewind(struct connectdata *conn);
CURLcode Curl_fillreadbuffer(struct connectdata *conn, int bytes, int *nreadp);
bool Curl_retry_request(struct connectdata *conn, char **url);

40
lib/url.c
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@ -164,6 +164,8 @@ static void conn_free(struct connectdata *conn);
static void signalPipeClose(struct curl_llist *pipe);
static struct SessionHandle* gethandleathead(struct curl_llist *pipe);
#define MAX_PIPELINE_LENGTH 5
/*
@ -1973,6 +1975,16 @@ bool Curl_isHandleAtHead(struct SessionHandle *handle,
return FALSE;
}
static struct SessionHandle* gethandleathead(struct curl_llist *pipe)
{
struct curl_llist_element *curr = pipe->head;
if (curr) {
return (struct SessionHandle *) curr->ptr;
}
return NULL;
}
static void signalPipeClose(struct curl_llist *pipe)
{
struct curl_llist_element *curr;
@ -2017,6 +2029,7 @@ ConnectionExists(struct SessionHandle *data,
for(i=0; i< data->state.connc->num; i++) {
bool match = FALSE;
int pipeLen = 0;
/*
* Note that if we use a HTTP proxy, we check connections to that
* proxy and not to the actual remote server.
@ -2026,16 +2039,18 @@ ConnectionExists(struct SessionHandle *data,
/* NULL pointer means not filled-in entry */
continue;
pipeLen = check->send_pipe->size + check->recv_pipe->size;
if (check->connectindex == -1) {
check->connectindex = i; /* Set this appropriately since it might have
been set to -1 when the easy was removed
from the multi */
}
DEBUGF(infof(data, "Examining connection #%ld for reuse\n",
check->connectindex));
DEBUGF(infof(data, "Examining connection #%ld for reuse \
(pipeLen = %ld)\n", check->connectindex, pipeLen));
if(check->inuse && !canPipeline) {
if(pipeLen > 0 && !canPipeline) {
/* can only happen within multi handles, and means that another easy
handle is using this connection */
continue;
@ -2052,13 +2067,26 @@ ConnectionExists(struct SessionHandle *data,
}
#endif
if (check->send_pipe->size +
check->recv_pipe->size >= MAX_PIPELINE_LENGTH) {
if (pipeLen >= MAX_PIPELINE_LENGTH) {
infof(data, "Connection #%ld has its pipeline full, can't reuse\n",
check->connectindex);
continue;
}
if (canPipeline) {
/* Make sure the pipe has only GET requests */
struct SessionHandle* sh = gethandleathead(check->send_pipe);
struct SessionHandle* rh = gethandleathead(check->recv_pipe);
if (sh) {
if(!IsPipeliningPossible(sh))
continue;
}
else if (rh) {
if(!IsPipeliningPossible(rh))
continue;
}
}
if (check->bits.close) {
/* Don't pick a connection that is going to be closed. */
infof(data, "Connection #%ld has been marked for close, can't reuse\n",
@ -3731,8 +3759,6 @@ else {
/* re-use init */
conn->bits.reuse = TRUE; /* yes, we're re-using here */
conn->bits.chunk = FALSE; /* always assume not chunked unless told
otherwise */
Curl_safefree(old_conn->user);
Curl_safefree(old_conn->passwd);

2
tests/data/test34
View File

@ -23,7 +23,7 @@ bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
cccccccccccccccccccccccccccccccc
0
muuu
</data>
<datacheck>
HTTP/1.1 200 funky chunky!