Mercurial > hg > nginx
view src/http/modules/ngx_http_range_filter_module.c @ 1417:b23a80f9a7b8
set current peer to use it in ngx_http_upstream_free_round_robin_peer()
author | Igor Sysoev <igor@sysoev.ru> |
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date | Fri, 24 Aug 2007 15:29:50 +0000 |
parents | 4ba6df5d5b53 |
children | 9706372f8916 |
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/* * Copyright (C) Igor Sysoev */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> /* * the single part format: * * "HTTP/1.0 206 Partial Content" CRLF * ... header ... * "Content-Type: image/jpeg" CRLF * "Content-Length: SIZE" CRLF * "Content-Range: bytes START-END/SIZE" CRLF * CRLF * ... data ... * * * the mutlipart format: * * "HTTP/1.0 206 Partial Content" CRLF * ... header ... * "Content-Type: multipart/byteranges; boundary=0123456789" CRLF * CRLF * CRLF * "--0123456789" CRLF * "Content-Type: image/jpeg" CRLF * "Content-Range: bytes START0-END0/SIZE" CRLF * CRLF * ... data ... * CRLF * "--0123456789" CRLF * "Content-Type: image/jpeg" CRLF * "Content-Range: bytes START1-END1/SIZE" CRLF * CRLF * ... data ... * CRLF * "--0123456789--" CRLF */ typedef struct { off_t start; off_t end; ngx_str_t content_range; } ngx_http_range_t; typedef struct { off_t offset; ngx_str_t boundary_header; ngx_array_t ranges; } ngx_http_range_filter_ctx_t; static ngx_int_t ngx_http_range_header_filter_init(ngx_conf_t *cf); static ngx_int_t ngx_http_range_body_filter_init(ngx_conf_t *cf); static ngx_http_module_t ngx_http_range_header_filter_module_ctx = { NULL, /* preconfiguration */ ngx_http_range_header_filter_init, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ NULL, /* create server configuration */ NULL, /* merge server configuration */ NULL, /* create location configuration */ NULL, /* merge location configuration */ }; ngx_module_t ngx_http_range_header_filter_module = { NGX_MODULE_V1, &ngx_http_range_header_filter_module_ctx, /* module context */ NULL, /* module directives */ NGX_HTTP_MODULE, /* module type */ NULL, /* init master */ NULL, /* init module */ NULL, /* init process */ NULL, /* init thread */ NULL, /* exit thread */ NULL, /* exit process */ NULL, /* exit master */ NGX_MODULE_V1_PADDING }; static ngx_http_module_t ngx_http_range_body_filter_module_ctx = { NULL, /* preconfiguration */ ngx_http_range_body_filter_init, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ NULL, /* create server configuration */ NULL, /* merge server configuration */ NULL, /* create location configuration */ NULL, /* merge location configuration */ }; ngx_module_t ngx_http_range_body_filter_module = { NGX_MODULE_V1, &ngx_http_range_body_filter_module_ctx, /* module context */ NULL, /* module directives */ NGX_HTTP_MODULE, /* module type */ NULL, /* init master */ NULL, /* init module */ NULL, /* init process */ NULL, /* init thread */ NULL, /* exit thread */ NULL, /* exit process */ NULL, /* exit master */ NGX_MODULE_V1_PADDING }; static ngx_http_output_header_filter_pt ngx_http_next_header_filter; static ngx_http_output_body_filter_pt ngx_http_next_body_filter; static ngx_int_t ngx_http_range_header_filter(ngx_http_request_t *r) { u_char *p; size_t len; off_t start, end; ngx_int_t rc; ngx_uint_t suffix, i; ngx_atomic_uint_t boundary; ngx_table_elt_t *content_range; ngx_http_range_t *range; ngx_http_range_filter_ctx_t *ctx; if (r->http_version < NGX_HTTP_VERSION_10 || r->headers_out.status != NGX_HTTP_OK || r != r->main || r->headers_out.content_length_n == -1 || !r->allow_ranges) { return ngx_http_next_header_filter(r); } if (r->headers_in.range == NULL || r->headers_in.range->value.len < 7 || ngx_strncasecmp(r->headers_in.range->value.data, (u_char *) "bytes=", 6) != 0) { r->headers_out.accept_ranges = ngx_list_push(&r->headers_out.headers); if (r->headers_out.accept_ranges == NULL) { return NGX_ERROR; } r->headers_out.accept_ranges->hash = 1; r->headers_out.accept_ranges->key.len = sizeof("Accept-Ranges") - 1; r->headers_out.accept_ranges->key.data = (u_char *) "Accept-Ranges"; r->headers_out.accept_ranges->value.len = sizeof("bytes") - 1; r->headers_out.accept_ranges->value.data = (u_char *) "bytes"; return ngx_http_next_header_filter(r); } ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_range_filter_ctx_t)); if (ctx == NULL) { return NGX_ERROR; } if (ngx_array_init(&ctx->ranges, r->pool, 1, sizeof(ngx_http_range_t)) == NGX_ERROR) { return NGX_ERROR; } rc = 0; range = NULL; p = r->headers_in.range->value.data + 6; for ( ;; ) { start = 0; end = 0; suffix = 0; while (*p == ' ') { p++; } if (*p != '-') { if (*p < '0' || *p > '9') { rc = NGX_HTTP_RANGE_NOT_SATISFIABLE; break; } while (*p >= '0' && *p <= '9') { start = start * 10 + *p++ - '0'; } while (*p == ' ') { p++; } if (*p++ != '-') { rc = NGX_HTTP_RANGE_NOT_SATISFIABLE; break; } if (start >= r->headers_out.content_length_n) { rc = NGX_HTTP_RANGE_NOT_SATISFIABLE; break; } while (*p == ' ') { p++; } if (*p == ',' || *p == '\0') { range = ngx_array_push(&ctx->ranges); if (range == NULL) { return NGX_ERROR; } range->start = start; range->end = r->headers_out.content_length_n; if (*p++ != ',') { break; } continue; } } else { suffix = 1; p++; } if (*p < '0' || *p > '9') { rc = NGX_HTTP_RANGE_NOT_SATISFIABLE; break; } while (*p >= '0' && *p <= '9') { end = end * 10 + *p++ - '0'; } while (*p == ' ') { p++; } if (*p != ',' && *p != '\0') { rc = NGX_HTTP_RANGE_NOT_SATISFIABLE; break; } if (suffix) { start = r->headers_out.content_length_n - end; end = r->headers_out.content_length_n - 1; } if (start > end) { rc = NGX_HTTP_RANGE_NOT_SATISFIABLE; break; } range = ngx_array_push(&ctx->ranges); if (range == NULL) { return NGX_ERROR; } range->start = start; if (end >= r->headers_out.content_length_n) { /* * Download Accelerator sends the last byte position * that equals to the file length */ range->end = r->headers_out.content_length_n; } else { range->end = end + 1; } if (*p++ != ',') { break; } } if (rc) { /* rc == NGX_HTTP_RANGE_NOT_SATISFIABLE */ r->headers_out.status = rc; content_range = ngx_list_push(&r->headers_out.headers); if (content_range == NULL) { return NGX_ERROR; } r->headers_out.content_range = content_range; content_range->hash = 1; content_range->key.len = sizeof("Content-Range") - 1; content_range->key.data = (u_char *) "Content-Range"; content_range->value.data = ngx_palloc(r->pool, sizeof("bytes */") - 1 + NGX_OFF_T_LEN); if (content_range->value.data == NULL) { return NGX_ERROR; } content_range->value.len = ngx_sprintf(content_range->value.data, "bytes */%O", r->headers_out.content_length_n) - content_range->value.data; ngx_http_clear_content_length(r); return rc; } ngx_http_set_ctx(r, ctx, ngx_http_range_body_filter_module); r->headers_out.status = NGX_HTTP_PARTIAL_CONTENT; if (ctx->ranges.nelts == 1) { content_range = ngx_list_push(&r->headers_out.headers); if (content_range == NULL) { return NGX_ERROR; } r->headers_out.content_range = content_range; content_range->hash = 1; content_range->key.len = sizeof("Content-Range") - 1; content_range->key.data = (u_char *) "Content-Range"; content_range->value.data = ngx_palloc(r->pool, sizeof("bytes -/") - 1 + 3 * NGX_OFF_T_LEN); if (content_range->value.data == NULL) { return NGX_ERROR; } /* "Content-Range: bytes SSSS-EEEE/TTTT" header */ content_range->value.len = ngx_sprintf(content_range->value.data, "bytes %O-%O/%O", range->start, range->end - 1, r->headers_out.content_length_n) - content_range->value.data; r->headers_out.content_length_n = range->end - range->start; if (r->headers_out.content_length) { r->headers_out.content_length->hash = 0; r->headers_out.content_length = NULL; } return ngx_http_next_header_filter(r); } /* TODO: what if no content_type ?? */ len = sizeof(CRLF "--") - 1 + NGX_ATOMIC_T_LEN + sizeof(CRLF "Content-Type: ") - 1 + r->headers_out.content_type.len + sizeof(CRLF "Content-Range: bytes ") - 1; if (r->headers_out.charset.len) { len += sizeof("; charset=") - 1 + r->headers_out.charset.len; } ctx->boundary_header.data = ngx_palloc(r->pool, len); if (ctx->boundary_header.data == NULL) { return NGX_ERROR; } boundary = ngx_next_temp_number(0); /* * The boundary header of the range: * CRLF * "--0123456789" CRLF * "Content-Type: image/jpeg" CRLF * "Content-Range: bytes " */ if (r->headers_out.charset.len) { ctx->boundary_header.len = ngx_sprintf(ctx->boundary_header.data, CRLF "--%0muA" CRLF "Content-Type: %V; charset=%V" CRLF "Content-Range: bytes ", boundary, &r->headers_out.content_type, &r->headers_out.charset) - ctx->boundary_header.data; r->headers_out.charset.len = 0; } else { ctx->boundary_header.len = ngx_sprintf(ctx->boundary_header.data, CRLF "--%0muA" CRLF "Content-Type: %V" CRLF "Content-Range: bytes ", boundary, &r->headers_out.content_type) - ctx->boundary_header.data; } r->headers_out.content_type.data = ngx_palloc(r->pool, sizeof("Content-Type: multipart/byteranges; boundary=") - 1 + NGX_ATOMIC_T_LEN); if (r->headers_out.content_type.data == NULL) { return NGX_ERROR; } /* "Content-Type: multipart/byteranges; boundary=0123456789" */ r->headers_out.content_type.len = ngx_sprintf(r->headers_out.content_type.data, "multipart/byteranges; boundary=%0muA", boundary) - r->headers_out.content_type.data; /* the size of the last boundary CRLF "--0123456789--" CRLF */ len = sizeof(CRLF "--") - 1 + NGX_ATOMIC_T_LEN + sizeof("--" CRLF) - 1; range = ctx->ranges.elts; for (i = 0; i < ctx->ranges.nelts; i++) { /* the size of the range: "SSSS-EEEE/TTTT" CRLF CRLF */ range[i].content_range.data = ngx_palloc(r->pool, 3 * NGX_OFF_T_LEN + 2 + 4); if (range[i].content_range.data == NULL) { return NGX_ERROR; } range[i].content_range.len = ngx_sprintf(range[i].content_range.data, "%O-%O/%O" CRLF CRLF, range[i].start, range[i].end - 1, r->headers_out.content_length_n) - range[i].content_range.data; len += ctx->boundary_header.len + range[i].content_range.len + (size_t) (range[i].end - range[i].start); } r->headers_out.content_length_n = len; if (r->headers_out.content_length) { r->headers_out.content_length->hash = 0; r->headers_out.content_length = NULL; } return ngx_http_next_header_filter(r); } static ngx_int_t ngx_http_range_body_filter(ngx_http_request_t *r, ngx_chain_t *in) { off_t start, last; ngx_buf_t *b, *buf; ngx_uint_t i; ngx_chain_t *out, *hcl, *rcl, *dcl, **ll; ngx_http_range_t *range; ngx_http_range_filter_ctx_t *ctx; if (in == NULL) { return ngx_http_next_body_filter(r, in); } ctx = ngx_http_get_module_ctx(r, ngx_http_range_body_filter_module); if (ctx == NULL) { return ngx_http_next_body_filter(r, in); } buf = in->buf; if (ngx_buf_special(in->buf)) { return ngx_http_next_body_filter(r, in); } if (ctx->offset) { goto overlapped; } range = ctx->ranges.elts; if (!buf->last_buf) { if (buf->in_file) { start = buf->file_pos + ctx->offset; last = buf->file_last + ctx->offset; } else { start = buf->pos - buf->start + ctx->offset; last = buf->last - buf->start + ctx->offset; } for (i = 0; i < ctx->ranges.nelts; i++) { if (start > range[i].start || last < range[i].end) { goto overlapped; } } } /* * the optimized version for the responses * that are passed in the single buffer */ ctx->offset = ngx_buf_size(buf); if (ctx->ranges.nelts == 1) { if (buf->in_file) { buf->file_pos = range->start; buf->file_last = range->end; } if (ngx_buf_in_memory(buf)) { buf->pos = buf->start + (size_t) range->start; buf->last = buf->start + (size_t) range->end; } return ngx_http_next_body_filter(r, in); } ll = &out; for (i = 0; i < ctx->ranges.nelts; i++) { /* * The boundary header of the range: * CRLF * "--0123456789" CRLF * "Content-Type: image/jpeg" CRLF * "Content-Range: bytes " */ b = ngx_calloc_buf(r->pool); if (b == NULL) { return NGX_ERROR; } b->memory = 1; b->pos = ctx->boundary_header.data; b->last = ctx->boundary_header.data + ctx->boundary_header.len; hcl = ngx_alloc_chain_link(r->pool); if (hcl == NULL) { return NGX_ERROR; } hcl->buf = b; /* "SSSS-EEEE/TTTT" CRLF CRLF */ b = ngx_calloc_buf(r->pool); if (b == NULL) { return NGX_ERROR; } b->temporary = 1; b->pos = range[i].content_range.data; b->last = range[i].content_range.data + range[i].content_range.len; rcl = ngx_alloc_chain_link(r->pool); if (rcl == NULL) { return NGX_ERROR; } rcl->buf = b; /* the range data */ b = ngx_calloc_buf(r->pool); if (b == NULL) { return NGX_ERROR; } b->in_file = buf->in_file; b->temporary = buf->temporary; b->memory = buf->memory; b->mmap = buf->mmap; b->file = buf->file; if (buf->in_file) { b->file_pos = range[i].start; b->file_last = range[i].end; } if (ngx_buf_in_memory(buf)) { b->pos = buf->start + (size_t) range[i].start; b->last = buf->start + (size_t) range[i].end; } dcl = ngx_alloc_chain_link(r->pool); if (dcl == NULL) { return NGX_ERROR; } dcl->buf = b; *ll = hcl; hcl->next = rcl; rcl->next = dcl; ll = &dcl->next; } /* the last boundary CRLF "--0123456789--" CRLF */ b = ngx_calloc_buf(r->pool); if (b == NULL) { return NGX_ERROR; } b->temporary = 1; b->last_buf = 1; b->pos = ngx_palloc(r->pool, sizeof(CRLF "--") - 1 + NGX_ATOMIC_T_LEN + sizeof("--" CRLF) - 1); if (b->pos == NULL) { return NGX_ERROR; } b->last = ngx_cpymem(b->pos, ctx->boundary_header.data, sizeof(CRLF "--") - 1 + NGX_ATOMIC_T_LEN); *b->last++ = '-'; *b->last++ = '-'; *b->last++ = CR; *b->last++ = LF; hcl = ngx_alloc_chain_link(r->pool); if (hcl == NULL) { return NGX_ERROR; } hcl->buf = b; hcl->next = NULL; *ll = hcl; return ngx_http_next_body_filter(r, out); overlapped: ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0, "range in overlapped buffers"); return NGX_ERROR; } static ngx_int_t ngx_http_range_header_filter_init(ngx_conf_t *cf) { ngx_http_next_header_filter = ngx_http_top_header_filter; ngx_http_top_header_filter = ngx_http_range_header_filter; return NGX_OK; } static ngx_int_t ngx_http_range_body_filter_init(ngx_conf_t *cf) { ngx_http_next_body_filter = ngx_http_top_body_filter; ngx_http_top_body_filter = ngx_http_range_body_filter; return NGX_OK; }