Re: [Qemu-devel] [PATCH v3] block.curl: adding 'timeout' option

["Benoît Canet" <benoit.canet@irqsave.net>]

The Wednesday 13 Aug 2014 à 12:44:27 (-0300), Daniel Henrique Barboza wrote :
> The curl hardcoded timeout (5 seconds) sometimes is not long
> enough depending on the remote server configuration and network
> traffic. The user should be able to set how much long he is
> willing to wait for the connection.
> 
> Adding a new option to set this timeout gives the user this
> flexibility. The previous default timeout of 5 seconds will be
> used if this option is not present.
> 
> Reviewed-by: Fam Zheng <famz@redhat.com>
> Signed-off-by: Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com>
> ---
>  block/curl.c    | 13 ++++++++++++-
>  qemu-options.hx | 10 ++++++++--
>  2 files changed, 20 insertions(+), 3 deletions(-)
> 
> diff --git a/block/curl.c b/block/curl.c
> index 79ff2f1..6f45547 100644
> --- a/block/curl.c
> +++ b/block/curl.c
> @@ -63,6 +63,7 @@ static CURLMcode __curl_multi_socket_action(CURLM *multi_handle,
>  #define CURL_NUM_ACB    8
>  #define SECTOR_SIZE     512
>  #define READ_AHEAD_DEFAULT (256 * 1024)
> +#define CURL_TIMEOUT_DEFAULT 5
>  
>  #define FIND_RET_NONE   0
>  #define FIND_RET_OK     1
> @@ -71,6 +72,7 @@ static CURLMcode __curl_multi_socket_action(CURLM *multi_handle,
>  #define CURL_BLOCK_OPT_URL       "url"
>  #define CURL_BLOCK_OPT_READAHEAD "readahead"
>  #define CURL_BLOCK_OPT_SSLVERIFY "sslverify"
> +#define CURL_BLOCK_OPT_TIMEOUT "timeout"
>  
>  struct BDRVCURLState;
>  
> @@ -109,6 +111,7 @@ typedef struct BDRVCURLState {
>      char *url;
>      size_t readahead_size;
>      bool sslverify;
> +    int timeout;
>      bool accept_range;
>      AioContext *aio_context;
>  } BDRVCURLState;
> @@ -382,7 +385,7 @@ static CURLState *curl_init_state(BDRVCURLState *s)
>          curl_easy_setopt(state->curl, CURLOPT_URL, s->url);
>          curl_easy_setopt(state->curl, CURLOPT_SSL_VERIFYPEER,
>                           (long) s->sslverify);
> -        curl_easy_setopt(state->curl, CURLOPT_TIMEOUT, 5);
> +        curl_easy_setopt(state->curl, CURLOPT_TIMEOUT, s->timeout);
>          curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION,
>                           (void *)curl_read_cb);
>          curl_easy_setopt(state->curl, CURLOPT_WRITEDATA, (void *)state);
> @@ -489,6 +492,11 @@ static QemuOptsList runtime_opts = {
>              .type = QEMU_OPT_BOOL,
>              .help = "Verify SSL certificate"
>          },
> +        {
> +            .name = CURL_BLOCK_OPT_TIMEOUT,
> +            .type = QEMU_OPT_NUMBER,
> +            .help = "Curl timeout"
> +        },
>          { /* end of list */ }
>      },
>  };
> @@ -525,6 +533,9 @@ static int curl_open(BlockDriverState *bs, QDict *options, int flags,
>          goto out_noclean;
>      }
>  
> +    s->timeout = qemu_opt_get_number(opts, CURL_BLOCK_OPT_TIMEOUT,
> +                                     CURL_TIMEOUT_DEFAULT);
> +
>      s->sslverify = qemu_opt_get_bool(opts, CURL_BLOCK_OPT_SSLVERIFY, true);
>  
>      file = qemu_opt_get(opts, CURL_BLOCK_OPT_URL);
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 96516c1..e93a94f 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -2351,6 +2351,11 @@ multiple of 512 bytes. It defaults to 256k.
>  @item sslverify
>  Whether to verify the remote server's certificate when connecting over SSL. It
>  can have the value 'on' or 'off'. It defaults to 'on'.
> +
> +@item timeout
> +Set the timeout in seconds of the CURL connection. This timeout is the time
> +that CURL waits for a response from the remote server to get the size of the
> +image to be downloaded. If not set, the default timeout of 5 seconds is used.
>  @end table
>  
>  Note that when passing options to qemu explicitly, @option{driver} is the value
> @@ -2372,9 +2377,10 @@ qemu-system-x86_64 -drive file=/tmp/Fedora-x86_64-20-20131211.1-sda.qcow2,copy-o
>  @end example
>  
>  Example: boot from an image stored on a VMware vSphere server with a self-signed
> -certificate using a local overlay for writes and a readahead of 64k
> +certificate using a local overlay for writes, a readahead of 64k and a timeout
> +of 10 seconds.
>  @example
> -qemu-img create -f qcow2 -o backing_file='json:@{"file.driver":"https",, "file.url":"https://user:password@@vsphere.example.com/folder/test/test-flat.vmdk?dcPath=Datacenter&dsName=datastore1",, "file.sslverify":"off",, "file.readahead":"64k"@}' /tmp/test.qcow2
> +qemu-img create -f qcow2 -o backing_file='json:@{"file.driver":"https",, "file.url":"https://user:password@@vsphere.example.com/folder/test/test-flat.vmdk?dcPath=Datacenter&dsName=datastore1",, "file.sslverify":"off",, "file.readahead":"64k",, "file.timeout":10@}' /tmp/test.qcow2
>  
>  qemu-system-x86_64 -drive file=/tmp/test.qcow2
>  @end example
> -- 
> 1.8.3.1
> 
> 
Reviewed-by: Benoit Canet <benoit.canet@nodalink.com>