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Implement SQS rendezvous in client and broker

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This features adds an additional rendezvous method to send client offers
and receive proxy answers through the use of Amazon SQS queues.

https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/-/issues/26151
This commit is contained in:
Michael Pu 2023-11-18 20:43:28 -05:00 • committed by Cecylia Bocovich
parent d0529141ac
commit 8fb17de152
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9 changed files with 472 additions and 4 deletions
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19
client/lib/rendezvous.go
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@ -26,7 +26,9 @@ import (
const (
brokerErrorUnexpected string = "Unexpected error, no answer."
readLimit = 100000 //Maximum number of bytes to be read from an HTTP response
rendezvousErrorMsg string = "One of SQS, AmpCache, or Domain Fronting rendezvous methods must be used."
readLimit = 100000 //Maximum number of bytes to be read from an HTTP response
)
// RendezvousMethod represents a way of communicating with the broker: sending
@ -88,14 +90,25 @@ func newBrokerChannelFromConfig(config ClientConfig) (*BrokerChannel, error) {
var rendezvous RendezvousMethod
var err error
if config.AmpCacheURL != "" {
if config.SQSQueueURL != "" {
if config.AmpCacheURL != "" || config.BrokerURL != "" {
log.Fatalln("Multiple rendezvous methods specified. " + rendezvousErrorMsg)
}
if config.SQSAccessKeyID == "" || config.SQSSecretKey == "" {
log.Fatalln("sqsakid and sqsskey must be specified to use SQS rendezvous method.")
}
log.Println("Through SQS queue at:", config.SQSQueueURL)
rendezvous, err = newSQSRendezvous(config.SQSQueueURL, config.SQSAccessKeyID, config.SQSSecretKey, brokerTransport)
} else if config.AmpCacheURL != "" && config.BrokerURL != "" {
log.Println("Through AMP cache at:", config.AmpCacheURL)
rendezvous, err = newAMPCacheRendezvous(
config.BrokerURL, config.AmpCacheURL, config.FrontDomains,
brokerTransport)
} else {
} else if config.BrokerURL != "" {
rendezvous, err = newHTTPRendezvous(
config.BrokerURL, config.FrontDomains, brokerTransport)
} else {
log.Fatalln("No rendezvous method was specified. " + rendezvousErrorMsg)
}
if err != nil {
return nil, err