GCP PubSub source

Requirements

The GCP Pub/Sub source requires a Pub/Sub subscription.

Configuration

Example configurations

{
  "sources": {
    "my_source_id": {
      "type": "gcp_pubsub",
      "project": "my-log-source-project",
      "subscription": "my-vector-source-subscription"
    }
  }
}

[sources.my_source_id]
type = "gcp_pubsub"
project = "my-log-source-project"
subscription = "my-vector-source-subscription"

sources:
  my_source_id:
    type: gcp_pubsub
    project: my-log-source-project
    subscription: my-vector-source-subscription

{
  "sources": {
    "my_source_id": {
      "type": "gcp_pubsub",
      "ack_deadline_secs": 600,
      "endpoint": "https://pubsub.googleapis.com",
      "full_response_size": 100,
      "keepalive_secs": 60,
      "max_concurrency": 10,
      "poll_time_seconds": 2,
      "project": "my-log-source-project",
      "retry_delay_secs": 1,
      "subscription": "my-vector-source-subscription"
    }
  }
}

[sources.my_source_id]
type = "gcp_pubsub"
ack_deadline_secs = 600
endpoint = "https://pubsub.googleapis.com"
full_response_size = 100
keepalive_secs = 60
max_concurrency = 10
poll_time_seconds = 2
project = "my-log-source-project"
retry_delay_secs = 1
subscription = "my-vector-source-subscription"

sources:
  my_source_id:
    type: gcp_pubsub
    ack_deadline_secs: 600
    endpoint: https://pubsub.googleapis.com
    full_response_size: 100
    keepalive_secs: 60
    max_concurrency: 10
    poll_time_seconds: 2
    project: my-log-source-project
    retry_delay_secs: 1
    subscription: my-vector-source-subscription

ack_deadline_seconds

optional uint

Deprecated

This option has been deprecated, use ack_deadline_secs instead.

The acknowledgement deadline, in seconds, to use for this stream.

Messages that are not acknowledged when this deadline expires may be retransmitted.

ack_deadline_secs

optional uint

The acknowledgement deadline, in seconds, to use for this stream.

Messages that are not acknowledged when this deadline expires may be retransmitted.

default: 600 (seconds)

acknowledgements

optional object

Deprecated

This field is deprecated.

Controls how acknowledgements are handled by this source.

This setting is deprecated in favor of enabling acknowledgements at the global or sink level.

Enabling or disabling acknowledgements at the source level has no effect on acknowledgement behavior.

See End-to-end Acknowledgements for more information on how event acknowledgement is handled.

acknowledgements.enabled

optional bool

Whether or not end-to-end acknowledgements are enabled for this source.

api_key

optional string literal

An API key.

Either an API key or a path to a service account credentials JSON file can be specified.

If both are unset, the GOOGLE_APPLICATION_CREDENTIALS environment variable is checked for a filename. If no filename is named, an attempt is made to fetch an instance service account for the compute instance the program is running on. If this is not on a GCE instance, then you must define it with an API key or service account credentials JSON file.

credentials_path

optional string literal

Path to a service account credentials JSON file.

Either an API key or a path to a service account credentials JSON file can be specified.

decoding

optional object

Configures how events are decoded from raw bytes.

decoding.avro

required object

Apache Avro-specific encoder options.

Relevant when: codec = "avro"

decoding.avro.schema

required string literal

The Avro schema definition. Please note that the following [apache_avro::types::Value] variants are currently not supported:

Date
Decimal
Duration
Fixed
TimeMillis

Examples

"{ \"type\": \"record\", \"name\": \"log\", \"fields\": [{ \"name\": \"message\", \"type\": \"string\" }] }"

decoding.avro.strip_schema_id_prefix

required bool

For Avro datum encoded in Kafka messages, the bytes are prefixed with the schema ID. Set this to true to strip the schema ID prefix. According to Confluent Kafka’s document.

decoding.codec

optional string literal enum

The codec to use for decoding events.

Enum options

Option	Description
`avro`	Decodes the raw bytes as as an Apache Avro message.
`bytes`	Uses the raw bytes as-is.
`gelf`	Decodes the raw bytes as a GELF message. This codec is experimental for the following reason: The GELF specification is more strict than the actual Graylog receiver. Vector’s decoder currently adheres more strictly to the GELF spec, with the exception that some characters such as `@` are allowed in field names. Other GELF codecs such as Loki’s, use a Go SDK that is maintained by Graylog, and is much more relaxed than the GELF spec. Going forward, Vector will use that Go SDK as the reference implementation, which means the codec may continue to relax the enforcement of specification.
`influxdb`	Decodes the raw bytes as an Influxdb Line Protocol message.
`json`	Decodes the raw bytes as JSON.
`native`	Decodes the raw bytes as native Protocol Buffers format. This codec is experimental.
`native_json`	Decodes the raw bytes as native JSON format. This codec is experimental.
`protobuf`	Decodes the raw bytes as protobuf.
`syslog`	Decodes the raw bytes as a Syslog message. Decodes either as the RFC 3164-style format (“old” style) or the RFC 5424-style format (“new” style, includes structured data).
`vrl`	Decodes the raw bytes as a string and passes them as input to a VRL program.

default: bytes

decoding.gelf

optional object

GELF-specific decoding options.

Relevant when: codec = "gelf"

decoding.gelf.lossy

optional bool

Determines whether or not to replace invalid UTF-8 sequences instead of failing.

When true, invalid UTF-8 sequences are replaced with the U+FFFD REPLACEMENT CHARACTER.

default: true

decoding.influxdb

optional object

Influxdb-specific decoding options.

Relevant when: codec = "influxdb"

decoding.influxdb.lossy

optional bool

Determines whether or not to replace invalid UTF-8 sequences instead of failing.

When true, invalid UTF-8 sequences are replaced with the U+FFFD REPLACEMENT CHARACTER.

default: true

decoding.json

optional object

JSON-specific decoding options.

Relevant when: codec = "json"

decoding.json.lossy

optional bool

Determines whether or not to replace invalid UTF-8 sequences instead of failing.

When true, invalid UTF-8 sequences are replaced with the U+FFFD REPLACEMENT CHARACTER.

default: true

decoding.native_json

optional object

Vector’s native JSON-specific decoding options.

Relevant when: codec = "native_json"

decoding.native_json.lossy

optional bool

Determines whether or not to replace invalid UTF-8 sequences instead of failing.

When true, invalid UTF-8 sequences are replaced with the U+FFFD REPLACEMENT CHARACTER.

default: true

decoding.protobuf

optional object

Protobuf-specific decoding options.

Relevant when: codec = "protobuf"

decoding.protobuf.desc_file

optional string literal

Path to desc file

decoding.protobuf.message_type

optional string literal

message type. e.g package.message

decoding.syslog

optional object

Syslog-specific decoding options.

Relevant when: codec = "syslog"

decoding.syslog.lossy

optional bool

Determines whether or not to replace invalid UTF-8 sequences instead of failing.

When true, invalid UTF-8 sequences are replaced with the U+FFFD REPLACEMENT CHARACTER.

default: true

decoding.vrl

required object

VRL-specific decoding options.

Relevant when: codec = "vrl"

decoding.vrl.source

required string literal

The Vector Remap Language (VRL) program to execute for each event. Note that the final contents of the . target will be used as the decoding result. Compilation error or use of ‘abort’ in a program will result in a decoding error.

decoding.vrl.timezone

optional string literal

The name of the timezone to apply to timestamp conversions that do not contain an explicit time zone. The time zone name may be any name in the TZ database, or local to indicate system local time.

If not set, local will be used.

Examples

"local"

"America/New_York"

"EST5EDT"

endpoint

optional string literal

The endpoint from which to pull data.

Examples

"https://us-central1-pubsub.googleapis.com"

default: https://pubsub.googleapis.com

framing

optional object

Framing configuration.

Framing handles how events are separated when encoded in a raw byte form, where each event is a frame that must be prefixed, or delimited, in a way that marks where an event begins and ends within the byte stream.

framing.character_delimited

required object

Options for the character delimited decoder.

Relevant when: method = "character_delimited"

framing.character_delimited.delimiter

required ascii_char

The character that delimits byte sequences.

framing.character_delimited.max_length

optional uint

The maximum length of the byte buffer.

This length does not include the trailing delimiter.

By default, there is no maximum length enforced. If events are malformed, this can lead to additional resource usage as events continue to be buffered in memory, and can potentially lead to memory exhaustion in extreme cases.

If there is a risk of processing malformed data, such as logs with user-controlled input, consider setting the maximum length to a reasonably large value as a safety net. This ensures that processing is not actually unbounded.

framing.chunked_gelf

optional object

Options for the chunked GELF decoder.

Relevant when: method = "chunked_gelf"

framing.chunked_gelf.decompression

optional string literal enum

Decompression configuration for GELF messages.

Enum options

Option	Description
`Auto`	Automatically detect the decompression method based on the magic bytes of the message.
`Gzip`	Use Gzip decompression.
`None`	Do not decompress the message.
`Zlib`	Use Zlib decompression.

default: Auto

framing.chunked_gelf.max_length

optional uint

The maximum length of a single GELF message, in bytes. Messages longer than this length will be dropped. If this option is not set, the decoder does not limit the length of messages and the per-message memory is unbounded.

Note that a message can be composed of multiple chunks and this limit is applied to the whole message, not to individual chunks.

This limit takes only into account the message’s payload and the GELF header bytes are excluded from the calculation. The message’s payload is the concatenation of all the chunks’ payloads.

framing.chunked_gelf.pending_messages_limit

optional uint

The maximum number of pending incomplete messages. If this limit is reached, the decoder starts dropping chunks of new messages, ensuring the memory usage of the decoder’s state is bounded. If this option is not set, the decoder does not limit the number of pending messages and the memory usage of its messages buffer can grow unbounded. This matches Graylog Server’s behavior.

framing.chunked_gelf.timeout_secs

optional float

The timeout, in seconds, for a message to be fully received. If the timeout is reached, the decoder drops all the received chunks of the timed out message.

default: 5

framing.length_delimited

required object

Options for the length delimited decoder.

Relevant when: method = "length_delimited"

framing.length_delimited.length_field_is_big_endian

optional bool

Length field byte order (little or big endian)

default: true

framing.length_delimited.length_field_length

optional uint

Number of bytes representing the field length

default: 4

framing.length_delimited.length_field_offset

optional uint

Number of bytes in the header before the length field

framing.length_delimited.max_frame_length

optional uint

Maximum frame length

default: 8.388608e+06

framing.method

optional string literal enum

The framing method.

Enum options

Option	Description
`bytes`	Byte frames are passed through as-is according to the underlying I/O boundaries (for example, split between messages or stream segments).
`character_delimited`	Byte frames which are delimited by a chosen character.
`chunked_gelf`	Byte frames which are chunked GELF messages.
`length_delimited`	Byte frames which are prefixed by an unsigned big-endian 32-bit integer indicating the length.
`newline_delimited`	Byte frames which are delimited by a newline character.
`octet_counting`	Byte frames according to the octet counting format.

default: bytes

framing.newline_delimited

optional object

Options for the newline delimited decoder.

Relevant when: method = "newline_delimited"

framing.newline_delimited.max_length

optional uint

The maximum length of the byte buffer.

This length does not include the trailing delimiter.

framing.octet_counting

optional object

Options for the octet counting decoder.

Relevant when: method = "octet_counting"

framing.octet_counting.max_length

optional uint

The maximum length of the byte buffer.

full_response_size

optional uint

The number of messages in a response to mark a stream as “busy”. This is used to determine if more streams should be started.

The GCP Pub/Sub servers send responses with 100 or more messages when the subscription is busy.

default: 100

keepalive_secs

optional float

The amount of time, in seconds, with no received activity before sending a keepalive request. If this is set larger than 60, you may see periodic errors sent from the server.

default: 60 (seconds)

max_concurrency

optional uint

The maximum number of concurrent stream connections to open at once.

default: 10

poll_time_seconds

optional float

How often to poll the currently active streams to see if they are all busy and so open a new stream.

default: 2 (seconds)

project

required string literal

The project name from which to pull logs.

Examples

"my-log-source-project"

proxy

optional object

Proxy configuration.

Configure to proxy traffic through an HTTP(S) proxy when making external requests.

Similar to common proxy configuration convention, you can set different proxies to use based on the type of traffic being proxied. You can also set specific hosts that should not be proxied.

proxy.enabled

optional bool

Enables proxying support.

default: true

proxy.http

optional string literal

Proxy endpoint to use when proxying HTTP traffic.

Must be a valid URI string.

Examples

"http://foo.bar:3128"

proxy.https

optional string literal

Proxy endpoint to use when proxying HTTPS traffic.

Must be a valid URI string.

Examples

"http://foo.bar:3128"

proxy.no_proxy

optional [string]

A list of hosts to avoid proxying.

Multiple patterns are allowed:

Pattern	Example match
Domain names	`example.com` matches requests to `example.com`
Wildcard domains	`.example.com` matches requests to `example.com` and its subdomains
IP addresses	`127.0.0.1` matches requests to `127.0.0.1`
CIDR blocks	`192.168.0.0/16` matches requests to any IP addresses in this range
Splat	`*` matches all hosts

retry_delay_seconds

optional float

Deprecated

This option has been deprecated, use retry_delay_secs instead.

The amount of time, in seconds, to wait between retry attempts after an error.

retry_delay_secs

optional float

The amount of time, in seconds, to wait between retry attempts after an error.

default: 1 (seconds)

subscription

required string literal

The subscription within the project which is configured to receive logs.

Examples

"my-vector-source-subscription"

tls

optional object

TLS configuration.

tls.alpn_protocols

optional [string]

Sets the list of supported ALPN protocols.

Declare the supported ALPN protocols, which are used during negotiation with peer. They are prioritized in the order that they are defined.

tls.ca_file

optional string literal

Absolute path to an additional CA certificate file.

The certificate must be in the DER or PEM (X.509) format. Additionally, the certificate can be provided as an inline string in PEM format.

Examples

"/path/to/certificate_authority.crt"

tls.crt_file

optional string literal

Absolute path to a certificate file used to identify this server.

The certificate must be in DER, PEM (X.509), or PKCS#12 format. Additionally, the certificate can be provided as an inline string in PEM format.

If this is set, and is not a PKCS#12 archive, key_file must also be set.

Examples

"/path/to/host_certificate.crt"

tls.key_file

optional string literal

Absolute path to a private key file used to identify this server.

The key must be in DER or PEM (PKCS#8) format. Additionally, the key can be provided as an inline string in PEM format.

Examples

"/path/to/host_certificate.key"

tls.key_pass

optional string literal

Passphrase used to unlock the encrypted key file.

This has no effect unless key_file is set.

Examples

"${KEY_PASS_ENV_VAR}"

"PassWord1"

tls.server_name

optional string literal

Server name to use when using Server Name Indication (SNI).

Only relevant for outgoing connections.

Examples

"www.example.com"

tls.verify_certificate

optional bool

Enables certificate verification. For components that create a server, this requires that the client connections have a valid client certificate. For components that initiate requests, this validates that the upstream has a valid certificate.

If enabled, certificates must not be expired and must be issued by a trusted issuer. This verification operates in a hierarchical manner, checking that the leaf certificate (the certificate presented by the client/server) is not only valid, but that the issuer of that certificate is also valid, and so on until the verification process reaches a root certificate.

Do NOT set this to false unless you understand the risks of not verifying the validity of certificates.

tls.verify_hostname

optional bool

Enables hostname verification.

If enabled, the hostname used to connect to the remote host must be present in the TLS certificate presented by the remote host, either as the Common Name or as an entry in the Subject Alternative Name extension.

Only relevant for outgoing connections.

Do NOT set this to false unless you understand the risks of not verifying the remote hostname.

Environment variables

HTTPS_PROXY

common optional string literal

The global URL to proxy HTTPS requests through.

If another HTTPS proxy is set in the configuration file or at a component level, this one will be overridden.

The lowercase variant has priority over the uppercase one.

Examples

http://foo.bar:3128

HTTP_PROXY

common optional string literal

The global URL to proxy HTTP requests through.

If another HTTP proxy is set in the configuration file or at a component level, this one will be overridden.

The lowercase variant has priority over the uppercase one.

Examples

http://foo.bar:3128

NO_PROXY

common optional string literal

List of hosts to avoid proxying globally.

Allowed patterns here include:

Pattern	Example match
Domain names	`example.com` matches requests to `example.com`
Wildcard domains	`.example.come` matches requests to `example.com` and its subdomains
IP addresses	`127.0.0.1` matches requests to `127.0.0.1`
CIDR blocks	`192.168.0.0./16` matches requests to any IP addresses in this range
Splat	`*` matches all hosts

If another no_proxy value is set in the configuration file or at a component level, this one is overridden.

The lowercase variant has priority over the uppercase one.

Examples

localhost,.example.com,192.168.0.0./16

http_proxy

common optional string literal

The global URL to proxy HTTP requests through.

If another HTTP proxy is set in the configuration file or at a component level, this one will be overridden.

The lowercase variant has priority over the uppercase one.

Examples

http://foo.bar:3128

https_proxy

common optional string literal

The global URL to proxy HTTPS requests through.

If another HTTPS proxy is set in the configuration file or at a component level, this one will be overridden.

The lowercase variant has priority over the uppercase one.

Examples

http://foo.bar:3128

no_proxy

common optional string literal

List of hosts to avoid proxying globally.

Allowed patterns here include:

Pattern	Example match
Domain names	`example.com` matches requests to `example.com`
Wildcard domains	`.example.come` matches requests to `example.com` and its subdomains
IP addresses	`127.0.0.1` matches requests to `127.0.0.1`
CIDR blocks	`192.168.0.0./16` matches requests to any IP addresses in this range
Splat	`*` matches all hosts

If another no_proxy value is set in the configuration file or at a component level, this one is overridden.

The lowercase variant has priority over the uppercase one.

Examples

localhost,.example.com,192.168.0.0./16

Outputs

<component_id>

Default output stream of the component. Use this component’s ID as an input to downstream transforms and sinks.

Output Data

Logs

Warning

The fields shown below will be different if log namespacing is enabled. See Log Namespacing for more details

Record

An individual Pub/Sub record

Fields

attributes required object

Attributes that were published with the Pub/Sub record.

Examples

{
  "key": "value"
}

message required string literal

The message from the Pub/Sub record, parsed from the raw data.

Examples

53.126.150.246 - - [01/Oct/2020:11:25:58 -0400] "GET /disintermediate HTTP/2.0" 401 20308

message_id required string literal

The ID of this message, assigned by the server when the message is published. Guaranteed to be unique within the topic.

Examples

source_type required string literal

The name of the source type.

Examples

gcp_pubsub

timestamp required timestamp

The time this message was published in the topic.

Examples

2020-10-10T17:07:36.452332Z

Telemetry

Metrics

link

component_discarded_events_total

counter

The number of events dropped by this component.

component_id

The Vector component ID.

component_kind

The Vector component kind.

component_type

The Vector component type.

host optional

The hostname of the system Vector is running on.

intentional

True if the events were discarded intentionally, like a filter transform, or false if due to an error.

pid optional

The process ID of the Vector instance.

component_errors_total

counter

The total number of errors encountered by this component.

component_id

The Vector component ID.

component_kind

The Vector component kind.

component_type

The Vector component type.

error_type

The type of the error

host optional

The hostname of the system Vector is running on.

pid optional

The process ID of the Vector instance.

stage

The stage within the component at which the error occurred.

component_received_bytes_total

counter

The number of raw bytes accepted by this component from source origins.

component_id

The Vector component ID.

component_kind

The Vector component kind.

component_type

The Vector component type.

container_name optional

The name of the container from which the data originated.

file optional

The file from which the data originated.

host optional

The hostname of the system Vector is running on.

mode optional

The connection mode used by the component.

peer_addr optional

The IP from which the data originated.

peer_path optional

The pathname from which the data originated.

pid optional

The process ID of the Vector instance.

pod_name optional

The name of the pod from which the data originated.

uri optional

The sanitized URI from which the data originated.

component_received_event_bytes_total

counter

The number of event bytes accepted by this component either from tagged origins like file and uri, or cumulatively from other origins.

component_id

The Vector component ID.

component_kind

The Vector component kind.

component_type

The Vector component type.

container_name optional

The name of the container from which the data originated.

file optional

The file from which the data originated.

host optional

The hostname of the system Vector is running on.

mode optional

The connection mode used by the component.

peer_addr optional

The IP from which the data originated.

peer_path optional

The pathname from which the data originated.

pid optional

The process ID of the Vector instance.

pod_name optional

The name of the pod from which the data originated.

uri optional

The sanitized URI from which the data originated.

component_received_events_count

histogram

A histogram of the number of events passed in each internal batch in Vector’s internal topology.

Note that this is separate than sink-level batching. It is mostly useful for low level debugging performance issues in Vector due to small internal batches.

component_id

The Vector component ID.

component_kind

The Vector component kind.

component_type

The Vector component type.

container_name optional

The name of the container from which the data originated.

file optional

The file from which the data originated.

host optional

The hostname of the system Vector is running on.

mode optional

The connection mode used by the component.

peer_addr optional

The IP from which the data originated.

peer_path optional

The pathname from which the data originated.

pid optional

The process ID of the Vector instance.

pod_name optional

The name of the pod from which the data originated.

uri optional

The sanitized URI from which the data originated.

component_received_events_total

counter

The number of events accepted by this component either from tagged origins like file and uri, or cumulatively from other origins.

component_id

The Vector component ID.

component_kind

The Vector component kind.

component_type

The Vector component type.

container_name optional

The name of the container from which the data originated.

file optional

The file from which the data originated.

host optional

The hostname of the system Vector is running on.

mode optional

The connection mode used by the component.

peer_addr optional

The IP from which the data originated.

peer_path optional

The pathname from which the data originated.

pid optional

The process ID of the Vector instance.

pod_name optional

The name of the pod from which the data originated.

uri optional

The sanitized URI from which the data originated.

component_sent_event_bytes_total

counter

The total number of event bytes emitted by this component.

component_id

The Vector component ID.

component_kind

The Vector component kind.

component_type

The Vector component type.

host optional

The hostname of the system Vector is running on.

output optional

The specific output of the component.

pid optional

The process ID of the Vector instance.

component_sent_events_total

counter

The total number of events emitted by this component.

component_id

The Vector component ID.

component_kind

The Vector component kind.

component_type

The Vector component type.

host optional

The hostname of the system Vector is running on.

output optional

The specific output of the component.

pid optional

The process ID of the Vector instance.

source_lag_time_seconds

histogram

The difference between the timestamp recorded in each event and the time when it was ingested, expressed as fractional seconds.

component_id

The Vector component ID.

component_kind

The Vector component kind.

component_type

The Vector component type.

host optional

The hostname of the system Vector is running on.

pid optional

The process ID of the Vector instance.

How it works

Automatic Concurrency Management

The `gcp_pubsub` source automatically manages the number of concurrent active streams by
monitoring the traffic flowing over the streams.
When a stream receives full responses (as determined by the `full_response_size` setting),
it marks itself as being "busy".
Periodically, the source will poll all the active connections and will start a new stream
if all the active streams are marked as busy and fewer than `max_concurrency` streams are
active.
Conversely, when a stream passes an idle interval (configured by the
`idle_timeout_seconds` setting) with no traffic and no outstanding acknowledgements,
it will drop the connection unless there are no other streams active.
This combination of actions allows this source to respond dynamically to high load levels
without opening up extra connections at startup.

Context

By default, the gcp_pubsub source augments events with helpful context keys.

GCP Pub/Sub

The gcp_pubsub source streams messages from GCP Pub/Sub. This is a highly scalable / durable queueing system with at-least-once queuing semantics. Messages are received in a stream and are either acknowledged immediately after receiving or after it has been fully processed by the sink(s), depending on if any of the sink(s) have the acknowledgements setting enabled.

State

This component is stateless, meaning its behavior is consistent across each input.

Transport Layer Security (TLS)

Vector uses OpenSSL for TLS protocols due to OpenSSL’s maturity. You can enable and adjust TLS behavior via the tls.* options and/or via an OpenSSL configuration file. The file location defaults to /usr/local/ssl/openssl.cnf or can be specified with the OPENSSL_CONF environment variable.