Chunk videoplayback response to avoid throttling

This commit is contained in:
Omar Roth 2019-06-26 14:43:33 -05:00
parent b31d1c06f5
commit 818cd2454d
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3 changed files with 66 additions and 30 deletions

View File

@ -54,6 +54,7 @@ MAX_ITEMS_PER_PAGE = 1500
REQUEST_HEADERS_WHITELIST = {"Accept", "Accept-Encoding", "Cache-Control", "Connection", "Content-Length", "If-None-Match", "Range"}
RESPONSE_HEADERS_BLACKLIST = {"Access-Control-Allow-Origin", "Alt-Svc", "Server"}
HTTP_CHUNK_SIZE = 10485760 # ~10MB
CURRENT_BRANCH = {{ "#{`git branch | sed -n '/\* /s///p'`.strip}" }}
CURRENT_COMMIT = {{ "#{`git rev-list HEAD --max-count=1 --abbrev-commit`.strip}" }}
@ -4648,40 +4649,57 @@ get "/videoplayback" do |env|
next
end
begin
range_begin, range_end = parse_range(env.request.headers["Range"]?)
client = make_client(URI.parse(host), proxies, region)
(range_begin...range_end).each_slice(HTTP_CHUNK_SIZE) do |slice|
headers["Range"] = "bytes=#{slice[0]}-#{slice[-1]}"
begin
client.get(url, headers) do |response|
content_range = response.headers["Content-Range"].lchop("bytes ")
content_size = content_range.split("/")[-1].to_i
# Write headers for first chunk
if content_range.split("-")[0].to_i == range_begin
if !env.request.headers["Range"]? && response.status_code == 206
env.response.status_code = 200
else
env.response.status_code = response.status_code
end
response.headers.each do |key, value|
if !RESPONSE_HEADERS_BLACKLIST.includes? key
if !RESPONSE_HEADERS_BLACKLIST.includes?(key) && key != "Content-Range"
env.response.headers[key] = value
end
end
reported_end = range_end ? range_end : content_size
env.response.content_length = reported_end - range_begin
if env.request.headers["Range"]?
env.response.headers["Content-Range"] = "bytes #{range_begin}-#{reported_end - 1}/#{content_size}"
end
env.response.headers["Access-Control-Allow-Origin"] = "*"
if response.headers["Location"]?
url = URI.parse(response.headers["Location"])
host = url.host
url = url.full_path
url += "&host=#{host}"
if region
url += "&region=#{region}"
end
next env.redirect url
end
if title = query_params["title"]?
# https://blog.fastmail.com/2011/06/24/download-non-english-filenames/
env.response.headers["Content-Disposition"] = "attachment; filename=\"#{URI.escape(title)}\"; filename*=UTF-8''#{URI.escape(title)}"
end
end
proxy_file(response, env)
end
rescue ex
# FIXME: Potential bug in HTTP::Client
if ex.message == "Error reading socket: Connection reset by peer"
next
else
raise ex
end
end
end
rescue ex
end
end

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@ -656,7 +656,7 @@ def proxy_file(response, env)
end
# https://stackoverflow.com/a/44802810 <3
def copy_in_chunks(input, output, chunk_size = 4096)
def copy_in_chunks(input, output, chunk_size = 8192)
size = 1
while size > 0
size = IO.copy(input, output, chunk_size)

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@ -358,3 +358,21 @@ def subscribe_pubsub(topic, key, config)
return client.post("/subscribe", form: body)
end
def parse_range(range)
if !range
return 0, nil
end
ranges = range.lchop("bytes=").split(',')
ranges.each do |range|
start_range, end_range = range.split('-')
start_range = start_range.to_i? || 0
end_range = end_range.to_i?.try &.+ 1
return start_range, end_range
end
return 0, nil
end