Added channel and worker.

Cargo.lock

@@ -353,6 +353,17 @@ version = "0.10.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "619743e34b5ba4e9703bba34deac3427c72507c7159f5fd030aea8cac0cfe341"
 
+[[package]]
+name = "async-channel"
+version = "1.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf46fee83e5ccffc220104713af3292ff9bc7c64c7de289f66dae8e38d826833"
+dependencies = [
+ "concurrent-queue",
+ "event-listener",
+ "futures-core",
+]
+
 [[package]]
 name = "async-trait"
 version = "0.1.63"
@@ -529,6 +540,15 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "concurrent-queue"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c278839b831783b70278b14df4d45e1beb1aad306c07bb796637de9a0e323e8e"
+dependencies = [
+ "crossbeam-utils",
+]
+
 [[package]]
 name = "convert_case"
 version = "0.4.0"
@@ -564,6 +584,15 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "crossbeam-utils"
+version = "0.8.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4fb766fa798726286dbbb842f174001dab8abc7b627a1dd86e0b7222a95d929f"
+dependencies = [
+ "cfg-if",
+]
+
 [[package]]
 name = "crypto-common"
 version = "0.1.6"
@@ -643,6 +672,7 @@ dependencies = [
  "actix-web",
  "actix-web-lab",
  "apache-avro",
+ "async-channel",
  "clap",
  "clap-verbosity-flag",
  "fraction",
@@ -664,6 +694,12 @@ dependencies = [
  "tokio",
 ]
 
+[[package]]
+name = "event-listener"
+version = "2.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0206175f82b8d6bf6652ff7d71a1e27fd2e4efde587fd368662814d6ec1d9ce0"
+
 [[package]]
 name = "fallible-iterator"
 version = "0.2.0"