nghttp2-go/nghttp2.c

#include "_nghttp2.h"

#define ARRLEN(x) (sizeof(x) / sizeof(x[0]))

// send_callback send data to network
static ssize_t send_callback(nghttp2_session *session, const uint8_t *data,
                             size_t length, int flags, void *user_data)
{
    return DataWrite(user_data, (void *)data, length);
}

// recv_callback read data from network
static ssize_t recv_callback(nghttp2_session *session, uint8_t *buf,
                             size_t length, int flags, void *user_data)
{
    return DataRead(user_data, (void *)buf, length);
}

static int on_header_callback(nghttp2_session *session,
                              const nghttp2_frame *frame, const uint8_t *name,
                              size_t namelen, const uint8_t *value,
                              size_t valuelen, uint8_t flags, void *user_data)
{
    switch (frame->hd.type)
    {
    case NGHTTP2_HEADERS:
        if (frame->headers.cat == NGHTTP2_HCAT_RESPONSE)
        {
            /* Print response headers for the initiated request. */
            //print_header(stderr, name, namelen, value, valuelen);
            OnHeaderCallback(user_data, frame->hd.stream_id,
                             (void *)name, namelen, (void *)value, valuelen);
            break;
        }
    }
    return 0;
}

static int on_begin_headers_callback(nghttp2_session *session,
                                     const nghttp2_frame *frame,
                                     void *user_data)
{
    int stream_id = frame->hd.stream_id;
    switch (frame->hd.type)
    {
    case NGHTTP2_HEADERS:
        if (frame->headers.cat == NGHTTP2_HCAT_RESPONSE)
        {
            fprintf(stderr, "Response headers for stream ID=%d:\n",
                    frame->hd.stream_id);
        }
        OnBeginHeaderCallback(user_data, stream_id);
        break;
    }
    return 0;
}

static int on_frame_recv_callback(nghttp2_session *session,
                                  const nghttp2_frame *frame, void *user_data)
{

    switch (frame->hd.type)
    {
    case NGHTTP2_HEADERS:
        if (frame->headers.cat == NGHTTP2_HCAT_RESPONSE)
        {
            fprintf(stderr, "All headers received\n");
        }
        OnFrameRecvCallback(user_data, frame->hd.stream_id);
        break;
    }
    return 0;
}

static int on_data_chunk_recv_callback(nghttp2_session *session, uint8_t flags,
                                       int32_t stream_id, const uint8_t *data,
                                       size_t len, void *user_data)
{
    return OnDataRecv(user_data, stream_id, (void *)data, len);
}

static int on_stream_close_callback(nghttp2_session *session, int32_t stream_id,
                                    uint32_t error_code, void *user_data)
{
    return 0;
}

ssize_t data_source_read_callback(nghttp2_session *session, int32_t stream_id,
                                  uint8_t *buf, size_t length, uint32_t *data_flags,
                                  nghttp2_data_source *source, void *user_data)
{
    int ret = DataSourceRead(source, buf, length);
    if (ret == 0)
    {
        *data_flags = NGHTTP2_DATA_FLAG_EOF;
    }
    return ret;
}

void init_nghttp2_session(nghttp2_session *session, void *data)
{
    nghttp2_session_callbacks *callbacks;

    nghttp2_session_callbacks_new(&callbacks);

    nghttp2_session_callbacks_set_send_callback(callbacks, send_callback);
    nghttp2_session_callbacks_set_recv_callback(callbacks, recv_callback);

    nghttp2_session_callbacks_set_on_frame_recv_callback(callbacks,
                                                         on_frame_recv_callback);

    nghttp2_session_callbacks_set_on_data_chunk_recv_callback(
        callbacks, on_data_chunk_recv_callback);

    nghttp2_session_callbacks_set_on_stream_close_callback(
        callbacks, on_stream_close_callback);

    nghttp2_session_callbacks_set_on_header_callback(callbacks,
                                                     on_header_callback);

    nghttp2_session_callbacks_set_on_begin_headers_callback(
        callbacks, on_begin_headers_callback);

    nghttp2_session_client_new(&session, callbacks, data);

    nghttp2_session_callbacks_del(callbacks);
}

int send_client_connection_header(nghttp2_session *session)
{
    nghttp2_settings_entry iv[1] = {
        {NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, 100}};
    int rv;

    /* client 24 bytes magic string will be sent by nghttp2 library */
    rv = nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv,
                                 ARRLEN(iv));
    /*
    if (rv != 0)
    {
        errx(1, "Could not submit SETTINGS: %s", nghttp2_strerror(rv));
    }
    */
    return rv;
}

int32_t submit_request(nghttp2_session *session, nghttp2_nv *hdrs, size_t hdrlen)
{
    int32_t stream_id;
    /*
    nghttp2_nv hdrs[] = {
        MAKE_NV2(":method", "GET"),
        MAKE_NV(":scheme", &uri[u->field_data[UF_SCHEMA].off],
                u->field_data[UF_SCHEMA].len),
        MAKE_NV(":authority", stream_data->authority, stream_data->authoritylen),
        MAKE_NV(":path", stream_data->path, stream_data->pathlen)};
    fprintf(stderr, "Request headers:\n");
    print_headers(stderr, hdrs, ARRLEN(hdrs));
    */
    stream_id = nghttp2_submit_request(session, NULL, hdrs,
                                       hdrlen, NULL, NULL);
    /*
    if (stream_id < 0)
    {
        errx(1, "Could not submit HTTP request: %s", nghttp2_strerror(stream_id));
    }
    */

    return stream_id;
}

struct nv_array *new_nv_array(size_t n)
{
    struct nv_array *a = malloc(sizeof(struct nv_array));
    nghttp2_nv *nv = (nghttp2_nv *)malloc(n * sizeof(nghttp2_nv));
    a->nv = nv;
    a->len = n;
    return a;
}

int nv_array_set(struct nv_array *a, int index,
                 char *name, char *value,
                 size_t namelen, size_t valuelen, int flag)
{
    if (index > (a->len - 1))
    {
        return -1;
    }
    nghttp2_nv nv = (a->nv)[index];
    nv.name = name;
    nv.value = value;
    nv.namelen = namelen;
    nv.valuelen = valuelen;
    nv.flags = flag;
    return 0;
}

void delete_nv_array(struct nv_array *a)
{
    free(a->nv);
    free(a);
}

nghttp2_data_provider *new_data_provider(void *data)
{
    nghttp2_data_provider *dp = malloc(sizeof(nghttp2_data_provider));
    dp->source.ptr = data;
    dp->read_callback = data_source_read_callback;
}