[send_payment] return TemporaryChannelFailure when TlcValueInflightExceedLimit

[gpBlockchain]

When the payment I send causes TlcValueInflightExceedLimit, the error message is TemporaryChannelFailure, making it difficult for users to identify the specific cause of the error.

curl --location 'http://127.0.0.1:8228' --header 'Content-Type: application/json' --data '{
    "id": 42,
    "jsonrpc": "2.0",
    "method": "send_payment",
    "params": [
        {
            "invoice": "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"
        }
    ]
}'
response:
{"jsonrpc": "2.0", "error": {"code": -32000, "message": "Send payment error: Failed to send onion packet with error \"TemporaryChannelFailure\"", "data": {"target_pubkey": null, "amount": null, "payment_hash": null, "final_cltv_delta": null, "invoice": "fibb500000000001pgxlna32kkmczxzat8almq2r0d3hzsce88zxpa7jh8gs9ktlqklp0hwrxyrd2v9klkhrv4zj0j8acru2p24hzqp29c6xnmlpd9n43zc4nrjhk4e635kxrnaeu3za8fd7gjqswwjw3lm4y53fvlp5lrktyx2geg8km95y6yy0rf97wlfzq55rh6cde3lepwdjmjqukx5qx9rwuuhv2te2pesvhcr6spj8d9cklnkpau7f4wjsdq8zvsm4uylwqdgn74ru297088afj4gu6769pf4rae6dwgssgmvasfgwjuq5tnasr4uudj2pwy555dwusq39n93kvpd8ean2zdw2c9ypckeky5xd635rtm2sywpcy9xgkpxx5a5pahpxlznqhk5zunquv3al8z9m29cgq4gksw7pg5fxvm6lcxmnnsgzfhydkc3sm8gg3smasnw3pjspz3wcp2yp8lrgtpwfkdqhpwfsx057alalwftf6d2eyyfeyj2j5ewdnuk9l47cqjjct76", "timeout": null, "max_fee_amount": null, "max_parts": null, "keysend": null, "udt_type_script": null, "allow_self_payment": null}}, "id": 42}

  2024-10-28T03:57:42.844380Z DEBUG fnn::fiber::network: Payment session already exists: PaymentSession { request: SendPaymentData { target_pubkey: Pubkey(PublicKey(8c8f2626c40b5d49d7a2643a2d557b7009956d78b0bd0fb6098f0c96538658a3f96bea71b6393c7f73c0e90f25648e8ce917244784173c58c8a772e7f0d86a11)), amount: 50000000000, payment_hash: Hash256(0x64c92911b0e4266f76b6bc3a3fe6578f80006cc1f1fe2c12b4e8e9964a433a14), invoice: Some("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"), final_cltv_delta: None, timeout: None, max_fee_amount: None, max_parts: None, keysend: false, udt_type_script: Some(Script(0x5500000010000000300000003100000073e5467341b55ffd7bdeb5b6f32aa0e9433baf6808f8c5f2472dbc36b1ab04f7012000000032e555f3ff8e135cece1351a6a2971518392c1e30375c1e006ad0ce8eac07947)), preimage: None, allow_self_payment: false }, retried_times: 5, last_error: Some("Failed to send onion packet with error \"TemporaryChannelFailure\""), try_limit: 5, status: Failed, created_at: 1730087793655, last_updated_at: 1730087793677622, first_hop_channel_outpoint: None, first_hop_tlc_id: None }
    at src/fiber/network.rs:2345
    in ractor::actor::Actor with id: "0.2", name: "Network QmRVAgDZ9HZJnr81fYQFkcbQqoyDuLVovqVWD3Zi8Qtn9e"

  2024-10-28T03:57:42.848094Z  INFO fnn::fiber::graph: build_route source: Pubkey(PublicKey(69c71a3c345301b2e5afbe8ffe89917165ea44711eac3f0fbb49a4ffcfb708fdc7385a3e140ea548705c0b94bd4651496aedc666ec33c5ce9f254bf548f0cbfb)) target: Pubkey(PublicKey(8c8f2626c40b5d49d7a2643a2d557b7009956d78b0bd0fb6098f0c96538658a3f96bea71b6393c7f73c0e90f25648e8ce917244784173c58c8a772e7f0d86a11)) amount: 50000000000, payment_hash: Hash256(0x64c92911b0e4266f76b6bc3a3fe6578f80006cc1f1fe2c12b4e8e9964a433a14)
    at src/fiber/graph.rs:502
    in ractor::actor::Actor with id: "0.2", name: "Network QmRVAgDZ9HZJnr81fYQFkcbQqoyDuLVovqVWD3Zi8Qtn9e"

  2024-10-28T03:57:42.848247Z DEBUG fnn::fiber::graph: probability: 0.5
    at src/fiber/graph.rs:710
    in ractor::actor::Actor with id: "0.2", name: "Network QmRVAgDZ9HZJnr81fYQFkcbQqoyDuLVovqVWD3Zi8Qtn9e"

  2024-10-28T03:57:42.848309Z  INFO fnn::fiber::graph: get_route: nodes visited: 2, edges expanded: 1, time: 93.5µs
    at src/fiber/graph.rs:753
    in ractor::actor::Actor with id: "0.2", name: "Network QmRVAgDZ9HZJnr81fYQFkcbQqoyDuLVovqVWD3Zi8Qtn9e"

  2024-10-28T03:57:42.850316Z DEBUG fnn::fiber::network: Processing onion packet info: PaymentHopData { payment_hash: Hash256(0x64c92911b0e4266f76b6bc3a3fe6578f80006cc1f1fe2c12b4e8e9964a433a14), preimage: None, tlc_hash_algorithm: Sha256, amount: 50000000000, expiry: 0, next_hop: Some(Pubkey(PublicKey(8c8f2626c40b5d49d7a2643a2d557b7009956d78b0bd0fb6098f0c96538658a3f96bea71b6393c7f73c0e90f25648e8ce917244784173c58c8a772e7f0d86a11))), channel_outpoint: Some(OutPoint(0xe7471f8f84cd3b42a65baf05aa294ad09b2dd35c5fc96a4ee4840494cffddbce00000000)) }
    at src/fiber/network.rs:2119
    in ractor::actor::Actor with id: "0.2", name: "Network QmRVAgDZ9HZJnr81fYQFkcbQqoyDuLVovqVWD3Zi8Qtn9e"

  2024-10-28T03:57:42.850461Z DEBUG fnn::fiber::channel: handle add tlc command : AddTlcCommand { amount: 50000000000, preimage: None, payment_hash: Some(Hash256(0x64c92911b0e4266f76b6bc3a3fe6578f80006cc1f1fe2c12b4e8e9964a433a14)), expiry: LockTime(0), hash_algorithm: Sha256, onion_packet: [0, 3, 163, 28, 10, 139, 90, 153, 120, 225, 148, 208, 174, 158, 216, 224, 241, 81, 191, 178, 133, 94, 11, 145, 51, 240, 162, 189, 106, 196, 90, 75, 156, 195, 232, 63, 47, 163, 104, 231, 151, 195, 123, 230, 52, 58, 98, 113, 242, 171, 45, 161, 80, 215, 90, 65, 144, 19, 185, 183, 24, 220, 161, 96, 47, 179, 209, 235, 193, 162, 223, 119, 60, 233, 67, 16, 238, 156, 49, 114, 77, 22, 23, 37, 82, 218, 153, 252, 79, 212, 105, 250, 28, 187, 175, 107, 207, 133, 200, 135, 209, 26, 79, 79, 139, 91, 97, 114, 39, 29, 239, 3, 124, 145, 15, 77, 121, 102, 165, 253, 197, 13, 54, 178, 216, 112, 40, 211, 114, 160, 23, 149, 212, 120, 183, 242, 176, 102, 94, 119, 3, 141, 180, 177, 158, 144, 177, 241, 88, 79, 250, 244, 115, 43, 193, 96, 147, 188, 222, 236, 131, 187, 72, 15, 61, 125, 190, 180, 192, 36, 247, 188, 2, 200, 49, 85, 60, 101, 207, 210, 142, 43, 151, 225, 198, 189, 80, 27, 42, 232, 178, 251, 108, 70, 203, 37, 67, 196, 236, 138, 90, 105, 124, 36, 66, 118, 251, 22, 8, 70, 194, 143, 121, 114, 244, 171, 57, 175, 165, 207, 59, 32, 8, 3, 86, 112, 140, 112, 153, 160, 194, 155, 4, 96, 9, 71, 65, 32, 170, 180, 184, 88, 228, 88, 2, 164, 98, 46, 147, 88, 104, 17, 85, 116, 195, 10, 159, 198, 31, 239, 225, 42, 95, 51, 194, 6, 179, 225, 149, 234, 56, 240, 175, 81, 108, 30, 149, 154, 19, 141, 174, 23, 69, 99, 157, 222, 212, 202, 143, 92, 241, 122, 144, 161, 124, 192, 127, 255, 40, 193, 243, 4, 119, 8, 53, 80, 250, 217, 242, 108, 17, 204, 139, 105, 123, 207, 3, 146, 124, 39, 227, 226, 11, 82, 50, 27, 242, 248, 190, 90, 225, 109, 84, 29, 58, 108, 193, 113, 219, 74, 98, 43, 66, 8, 127, 61, 94, 243, 40, 211, 87, 128, 175, 151, 207, 57, 177, 149, 116, 124, 228, 69, 38, 94, 54, 0, 228, 154, 28, 64, 56, 144, 57, 26, 203, 166, 148, 117, 118, 75, 73, 235, 79, 120, 251, 85, 58, 215, 247, 51, 49, 134, 70, 10, 78, 207, 1, 223, 83, 143, 9, 166, 115, 238, 9, 10, 232, 105, 42, 152, 43, 189, 208, 82, 100, 210, 157, 252, 126, 207, 99, 86, 243, 31, 39, 14, 92, 254, 250, 187, 165, 237, 241, 146, 85, 40, 18, 40, 7, 152, 214, 185, 203, 210, 156, 128, 56, 237, 95, 218, 18, 245, 94, 226, 159, 151, 52, 23, 196, 54, 3, 157, 81, 151, 150, 17, 127, 86, 154, 56, 48, 213, 124, 110, 35, 102, 164, 156, 89, 100, 85, 209, 97, 64, 119, 59, 145, 85, 15, 173, 117, 22, 206, 41, 78, 134, 207, 30, 251, 156, 191, 157, 18, 189, 145, 95, 207, 140, 188, 98, 208, 170, 185, 182, 153, 24, 83, 9, 19, 149, 241, 63, 237, 102, 97, 213, 178, 231, 114, 242, 167, 157, 29, 63, 231, 198, 123, 82, 104, 186, 90, 45, 233, 80, 110, 63, 52, 53, 181, 22, 73, 18, 52, 33, 2, 61, 147, 110, 11, 151, 185, 214, 72, 102, 243, 23, 243, 180, 32, 247, 109, 120, 186, 186, 76, 0, 190, 147, 222, 115, 165, 203, 132, 190, 34, 224, 55, 120, 14, 240, 158, 44, 165, 8, 200, 0, 149, 72, 71, 90, 190, 13, 137, 196, 96, 165, 83, 173, 253, 36, 159, 89, 7, 202, 129, 62, 239, 206, 252, 143, 172, 252, 47, 22, 220, 136, 237, 59, 242, 74, 148, 249, 230, 10, 182, 189, 131, 81, 24, 66, 69, 138, 9, 48, 64, 30, 126, 227, 130, 27, 109, 248, 140, 58, 55, 138, 40, 109, 45, 104, 221, 49, 6, 65, 252, 110, 28, 75, 13, 195, 160, 227, 165, 187, 112, 187, 210, 198, 252, 18, 13, 221, 81, 255, 87, 126, 76, 89, 169, 69, 24, 15, 61, 123, 228, 207, 178, 222, 59, 29, 211, 246, 106, 29, 211, 177, 36, 219, 41, 116, 228, 110, 208, 181, 205, 250, 183, 33, 47, 227, 97, 40, 120, 203, 102, 69, 171, 69, 79, 201, 229, 126, 201, 239, 67, 152, 180, 76, 211, 99, 5, 160, 79, 165, 95, 209, 139, 156, 123, 37, 31, 86, 71, 242, 167, 108, 158, 85, 117, 13, 176, 187, 153, 181, 20, 210, 22, 138, 154, 28, 84, 146, 151, 15, 102, 106, 150, 43, 35, 179, 195, 125, 12, 146, 65, 224, 216, 72, 57, 100, 235, 156, 65, 35, 219, 135, 5, 71, 15, 253, 61, 127, 248, 51, 145, 178, 106, 94, 76, 90, 13, 185, 234, 239, 10, 52, 104, 223, 211, 35, 4, 163, 62, 197, 40, 240, 113, 75, 30, 39, 163, 128, 112, 203, 52, 67, 9, 28, 191, 179, 144, 195, 152, 192, 186, 210, 40, 102, 10, 244, 247, 227, 224, 241, 180, 64, 153, 254, 15, 150, 15, 126, 38, 219, 67, 144, 135, 48, 49, 27, 19, 154, 92, 107, 43, 33, 41, 137, 0, 62, 124, 158, 88, 163, 1, 1, 195, 18, 98, 132, 51, 111, 77, 138, 163, 196, 163, 253, 103, 150, 39, 72, 93, 102, 164, 118, 15, 41, 242, 15, 99, 251, 154, 187, 183, 92, 39, 233, 232, 206, 5, 153, 216, 39, 196, 233, 123, 189, 206, 2, 58, 136, 141, 112, 81, 144, 136, 46, 157, 230, 31, 60, 242, 29, 200, 97, 13, 11, 201, 19, 11, 85, 208, 84, 127, 77, 93, 53, 166, 198, 242, 152, 203, 99, 70, 47, 232, 120, 158, 214, 202, 125, 254, 171, 109, 226, 242, 136, 145, 15, 238, 76, 1, 105, 9, 41, 182, 168, 171, 229, 202, 8, 181, 65, 36, 169, 46, 23, 227, 51, 36, 255, 134, 253, 252, 197, 75, 13, 223, 251, 62, 153, 0, 171, 119, 12, 55, 166, 47, 73, 115, 247, 120, 197, 35, 231, 159, 172, 181, 194, 37, 52, 120, 225, 146, 22, 246, 241, 52, 66, 231, 76, 12, 200, 196, 7, 72, 10, 190, 221, 194, 6, 240, 127, 187, 100, 84, 234, 73, 229, 80, 193, 113, 173, 195, 234, 238, 136, 4, 228, 12, 4, 86, 155, 122, 145, 37, 47, 94, 70, 70, 6, 103, 194, 76, 231, 190, 172, 136, 45, 142, 48, 75, 4, 173, 192, 36, 207, 160, 31, 147, 204, 145, 121, 208, 182, 20, 93, 41, 79, 132, 224, 148, 238, 165, 36, 113, 212, 168, 222, 58, 185, 7, 95, 121, 37, 46, 187, 132, 1, 167, 138, 247, 60, 128, 151, 117, 234, 201, 78, 213, 133, 162, 122, 64, 156, 191, 27, 224, 208, 108, 184, 173, 165, 99, 12, 166, 44, 108, 111, 62, 36, 166, 89, 106, 119, 153, 217, 27, 44, 118, 189, 23, 77, 121, 162, 175, 2, 39, 200, 226, 73, 110, 209, 36, 28, 140, 11, 58, 65, 3, 157, 97, 187, 243, 14, 229, 154, 97, 232, 122, 151, 178, 61, 118, 107, 228, 71, 102, 70, 248, 167, 152, 224, 132, 146, 219, 132, 142, 83, 173, 208, 83, 112, 208, 58, 84, 171, 51, 124, 220, 86, 166, 250, 16, 237, 6, 139, 216, 21, 92, 119, 183, 226, 104, 180, 128, 81, 249, 93, 230, 24, 216, 107, 126, 124, 93, 49, 174, 101, 117, 111, 127, 206, 144, 39, 98, 237, 247, 242, 122, 125, 177, 219, 82, 139, 18, 112, 0, 148, 48, 142, 207, 23, 76, 63, 217, 144, 43, 96, 229, 112, 61, 200, 63, 71, 109, 82, 251, 136, 38, 143, 230, 171, 148, 186, 253, 80, 49, 184, 186, 4, 147, 225, 187, 89, 105, 161, 83, 234, 162, 120, 224, 175, 25, 216, 248, 180, 176, 227, 15, 4, 46, 148, 21, 69, 76, 27, 182, 225, 46, 231, 188, 47, 118, 138, 227, 18, 246, 109, 206, 216, 146, 213, 165, 66, 31, 159, 57, 185, 131, 223, 150, 118, 89, 180], previous_tlc: None }
    at src/fiber/channel.rs:1048
    in ractor::actor::Actor with id: "0.5", name: "Channel-0 QmRVAgDZ9HZJnr81fYQFkcbQqoyDuLVovqVWD3Zi8Qtn9e <-> QmPDDQv1BNTq2Jx4Jdnf7p3so4xPQ8MmTvsEH6w8MyjPnZ"

  2024-10-28T03:57:42.850638Z DEBUG fnn::fiber::channel: Funding transaction lock args: Bytes(0x140000008dec59240f9fb102975c8f6e90b30314c20bd114)
    at src/fiber/channel.rs:3582
    in ractor::actor::Actor with id: "0.5", name: "Channel-0 QmRVAgDZ9HZJnr81fYQFkcbQqoyDuLVovqVWD3Zi8Qtn9e <-> QmPDDQv1BNTq2Jx4Jdnf7p3so4xPQ8MmTvsEH6w8MyjPnZ"

  2024-10-28T03:57:42.850732Z ERROR fnn::fiber::channel: Error while processing channel command: TlcValueInflightExceedLimit
    at src/fiber/channel.rs:1811
    in ractor::actor::Actor with id: "0.5", name: "Channel-0 QmRVAgDZ9HZJnr81fYQFkcbQqoyDuLVovqVWD3Zi8Qtn9e <-> QmPDDQv1BNTq2Jx4Jdnf7p3so4xPQ8MmTvsEH6w8MyjPnZ"

  2024-10-28T03:57:42.851555Z ERROR fnn::fiber::network: Failed to send onion packet with error: TlcErrPacket { onion_packet: [123, 10, 32, 32, 34, 101, 114, 114, 111, 114, 95, 99, 111, 100, 101, 34, 58, 32, 34, 84, 101, 109, 112, 111, 114, 97, 114, 121, 67, 104, 97, 110, 110, 101, 108, 70, 97, 105, 108, 117, 114, 101, 34, 44, 10, 32, 32, 34, 101, 120, 116, 114, 97, 95, 100, 97, 116, 97, 34, 58, 32, 123, 10, 32, 32, 32, 32, 34, 67, 104, 97, 110, 110, 101, 108, 70, 97, 105, 108, 101, 100, 34, 58, 32, 123, 10, 32, 32, 32, 32, 32, 32, 34, 99, 104, 97, 110, 110, 101, 108, 95, 111, 117, 116, 112, 111, 105, 110, 116, 34, 58, 32, 34, 48, 120, 101, 55, 52, 55, 49, 102, 56, 102, 56, 52, 99, 100, 51, 98, 52, 50, 97, 54, 53, 98, 97, 102, 48, 53, 97, 97, 50, 57, 52, 97, 100, 48, 57, 98, 50, 100, 100, 51, 53, 99, 53, 102, 99, 57, 54, 97, 52, 101, 101, 52, 56, 52, 48, 52, 57, 52, 99, 102, 102, 100, 100, 98, 99, 101, 48, 48, 48, 48, 48, 48, 48, 48, 34, 44, 10, 32, 32, 32, 32, 32, 32, 34, 99, 104, 97, 110, 110, 101, 108, 95, 117, 112, 100, 97, 116, 101, 34, 58, 32, 123, 10, 32, 32, 32, 32, 32, 32, 32, 32, 34, 115, 105, 103, 110, 97, 116, 117, 114, 101, 34, 58, 32, 34, 51, 48, 52, 53, 48, 50, 50, 49, 48, 48, 102, 100, 50, 99, 101, 51, 54, 51, 57, 102, 97, 49, 97, 54, 49, 49, 50, 50, 101, 56, 101, 52, 101, 49, 50, 54, 53, 51, 51, 57, 101, 97, 54, 52, 52, 53, 102, 53, 49, 48, 56, 53, 50, 55, 50, 99, 55, 57, 48, 99, 57, 51, 56, 54, 100, 52, 101, 50, 99, 48, 99, 98, 55, 50, 48, 50, 50, 48, 50, 99, 53, 50, 100, 56, 101, 52, 48, 57, 50, 101, 49, 101, 54, 51, 53, 101, 100, 97, 52, 56, 101, 99, 101, 51, 52, 50, 98, 55, 49, 97, 57, 99, 55, 57, 57, 49, 56, 50, 48, 98, 50, 100, 101, 97, 99, 48, 50, 53, 53, 98, 57, 97, 53, 55, 102, 102, 57, 99, 52, 57, 99, 101, 34, 44, 10, 32, 32, 32, 32, 32, 32, 32, 32, 34, 99, 104, 97, 105, 110, 95, 104, 97, 115, 104, 34, 58, 32, 34, 48, 120, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 34, 44, 10, 32, 32, 32, 32, 32, 32, 32, 32, 34, 99, 104, 97, 110, 110, 101, 108, 95, 111, 117, 116, 112, 111, 105, 110, 116, 34, 58, 32, 34, 48, 120, 101, 55, 52, 55, 49, 102, 56, 102, 56, 52, 99, 100, 51, 98, 52, 50, 97, 54, 53, 98, 97, 102, 48, 53, 97, 97, 50, 57, 52, 97, 100, 48, 57, 98, 50, 100, 100, 51, 53, 99, 53, 102, 99, 57, 54, 97, 52, 101, 101, 52, 56, 52, 48, 52, 57, 52, 99, 102, 102, 100, 100, 98, 99, 101, 48, 48, 48, 48, 48, 48, 48, 48, 34, 44, 10, 32, 32, 32, 32, 32, 32, 32, 32, 34, 118, 101, 114, 115, 105, 111, 110, 34, 58, 32, 49, 55, 51, 48, 48, 56, 55, 55, 56, 55, 44, 10, 32, 32, 32, 32, 32, 32, 32, 32, 34, 109, 101, 115, 115, 97, 103, 101, 95, 102, 108, 97, 103, 115, 34, 58, 32, 49, 44, 10, 32, 32, 32, 32, 32, 32, 32, 32, 34, 99, 104, 97, 110, 110, 101, 108, 95, 102, 108, 97, 103, 115, 34, 58, 32, 48, 44, 10, 32, 32, 32, 32, 32, 32, 32, 32, 34, 116, 108, 99, 95, 108, 111, 99, 107, 116, 105, 109, 101, 95, 101, 120, 112, 105, 114, 121, 95, 100, 101, 108, 116, 97, 34, 58, 32, 56, 54, 52, 48, 48, 44, 10, 32, 32, 32, 32, 32, 32, 32, 32, 34, 116, 108, 99, 95, 109, 105, 110, 105, 109, 117, 109, 95, 118, 97, 108, 117, 101, 34, 58, 32, 48, 44, 10, 32, 32, 32, 32, 32, 32, 32, 32, 34, 116, 108, 99, 95, 109, 97, 120, 105, 109, 117, 109, 95, 118, 97, 108, 117, 101, 34, 58, 32, 48, 44, 10, 32, 32, 32, 32, 32, 32, 32, 32, 34, 116, 108, 99, 95, 102, 101, 101, 95, 112, 114, 111, 112, 111, 114, 116, 105, 111, 110, 97, 108, 95, 109, 105, 108, 108, 105, 111, 110, 116, 104, 115, 34, 58, 32, 49, 48, 48, 48, 10, 32, 32, 32, 32, 32, 32, 125, 10, 32, 32, 32, 32, 125, 10, 32, 32, 125, 10, 125] }

[chenyukang]

I'm not sure whether we should fix it.

The error code is implemented with reference of BOLTS: https://github.com/lightning/bolts/blob/master/04-onion-routing.md#returning-errors

We need to get a balance between privacy and convenience of identifying the specific cause of the error.

[sunchengzhu]

I have the same confusion. I focused only on the error message returned by the send_payment RPC and overlooked the node logs, which made it take me a long time to pinpoint the cause of the error.