exas

exas

API

The HTTP API is pretty simple :

• GET /health: healthcheck of server, always respond okStatus (default 204)
• GET /ready: checks external dependencies availability and then respond okStatus (default 204) or 503 during graceDuration when SIGTERM is received
• GET /version: value of VERSION environment variable
• GET /metrics: Prometheus metrics, on a dedicated port prometheusPort (default 9090)
• POST /: extract Exif of the image passed in payload in binary

Installation

Golang binary is built with static link. You can download it directly from the GitHub Release page or build it by yourself by cloning this repo and running make.

A Docker image is available for amd64, arm and arm64 platforms on Docker Hub: vibioh/exas.

You can configure app by passing CLI args or environment variables (cf. Usage section). CLI override environment variables.

You'll find a Kubernetes exemple in the infra/ folder, using my app chart

CI

Following variables are required for CI:

Usage

The application can be configured by passing CLI args described below or their equivalent as environment variable. CLI values take precedence over environments variables.

Be careful when using the CLI values, if someone list the processes on the system, they will appear in plain-text. Pass secrets by environment variables: it's less easily visible.

Usage of exas:
  -address string
        [server] Listen address {EXAS_ADDRESS}
  -amqpExchange string
        [amqp] Exchange name {EXAS_AMQP_EXCHANGE} (default "fibr")
  -amqpExclusive
        [amqp] Queue exclusive mode (for fanout exchange) {EXAS_AMQP_EXCLUSIVE}
  -amqpMaxRetry uint
        [amqp] Max send retries {EXAS_AMQP_MAX_RETRY} (default 3)
  -amqpPrefetch int
        [amqp] Prefetch count for QoS {EXAS_AMQP_PREFETCH} (default 1)
  -amqpQueue string
        [amqp] Queue name {EXAS_AMQP_QUEUE} (default "exas")
  -amqpRetryInterval duration
        [amqp] Interval duration when send fails {EXAS_AMQP_RETRY_INTERVAL} (default 1h0m0s)
  -amqpRoutingKey string
        [amqp] RoutingKey name {EXAS_AMQP_ROUTING_KEY} (default "exif_input")
  -amqpURI string
        [amqp] Address in the form amqps?://<user>:<password>@<address>:<port>/<vhost> {EXAS_AMQP_URI}
  -cert string
        [server] Certificate file {EXAS_CERT}
  -exchange string
        [exas] AMQP Exchange Name {EXAS_EXCHANGE} (default "fibr")
  -geocodeURL string
        [exif] Nominatim Geocode Service URL. This can leak GPS metadatas to a third-party (e.g. "https://nominatim.openstreetmap.org") {EXAS_GEOCODE_URL}
  -graceDuration duration
        [http] Grace duration when SIGTERM received {EXAS_GRACE_DURATION} (default 30s)
  -idleTimeout duration
        [server] Idle Timeout {EXAS_IDLE_TIMEOUT} (default 2m0s)
  -key string
        [server] Key file {EXAS_KEY}
  -loggerJson
        [logger] Log format as JSON {EXAS_LOGGER_JSON}
  -loggerLevel string
        [logger] Logger level {EXAS_LOGGER_LEVEL} (default "INFO")
  -loggerLevelKey string
        [logger] Key for level in JSON {EXAS_LOGGER_LEVEL_KEY} (default "level")
  -loggerMessageKey string
        [logger] Key for message in JSON {EXAS_LOGGER_MESSAGE_KEY} (default "message")
  -loggerTimeKey string
        [logger] Key for timestamp in JSON {EXAS_LOGGER_TIME_KEY} (default "time")
  -okStatus int
        [http] Healthy HTTP Status code {EXAS_OK_STATUS} (default 204)
  -port uint
        [server] Listen port (0 to disable) {EXAS_PORT} (default 1080)
  -prometheusAddress string
        [prometheus] Listen address {EXAS_PROMETHEUS_ADDRESS}
  -prometheusCert string
        [prometheus] Certificate file {EXAS_PROMETHEUS_CERT}
  -prometheusGzip
        [prometheus] Enable gzip compression of metrics output {EXAS_PROMETHEUS_GZIP}
  -prometheusIdleTimeout duration
        [prometheus] Idle Timeout {EXAS_PROMETHEUS_IDLE_TIMEOUT} (default 10s)
  -prometheusIgnore string
        [prometheus] Ignored path prefixes for metrics, comma separated {EXAS_PROMETHEUS_IGNORE}
  -prometheusKey string
        [prometheus] Key file {EXAS_PROMETHEUS_KEY}
  -prometheusPort uint
        [prometheus] Listen port (0 to disable) {EXAS_PROMETHEUS_PORT} (default 9090)
  -prometheusReadTimeout duration
        [prometheus] Read Timeout {EXAS_PROMETHEUS_READ_TIMEOUT} (default 5s)
  -prometheusShutdownTimeout duration
        [prometheus] Shutdown Timeout {EXAS_PROMETHEUS_SHUTDOWN_TIMEOUT} (default 5s)
  -prometheusWriteTimeout duration
        [prometheus] Write Timeout {EXAS_PROMETHEUS_WRITE_TIMEOUT} (default 10s)
  -readTimeout duration
        [server] Read Timeout {EXAS_READ_TIMEOUT} (default 2m0s)
  -routingKey string
        [exas] AMQP Routing Key to fibr {EXAS_ROUTING_KEY} (default "exif_output")
  -shutdownTimeout duration
        [server] Shutdown Timeout {EXAS_SHUTDOWN_TIMEOUT} (default 10s)
  -storageFileSystemDirectory /data
        [storage] Path to directory. Default is dynamic. /data on a server and Current Working Directory in a terminal. {EXAS_STORAGE_FILE_SYSTEM_DIRECTORY}
  -storageObjectAccessKey string
        [storage] Storage Object Access Key {EXAS_STORAGE_OBJECT_ACCESS_KEY}
  -storageObjectBucket string
        [storage] Storage Object Bucket {EXAS_STORAGE_OBJECT_BUCKET}
  -storageObjectEndpoint string
        [storage] Storage Object endpoint {EXAS_STORAGE_OBJECT_ENDPOINT}
  -storageObjectSSL
        [storage] Use SSL {EXAS_STORAGE_OBJECT_SSL} (default true)
  -storageObjectSecretAccess string
        [storage] Storage Object Secret Access {EXAS_STORAGE_OBJECT_SECRET_ACCESS}
  -storagePartSize uint
        [storage] PartSize configuration {EXAS_STORAGE_PART_SIZE} (default 5242880)
  -tracerRate string
        [tracer] Jaeger sample rate, 'always', 'never' or a float value {EXAS_TRACER_RATE} (default "always")
  -tracerURL string
        [tracer] Jaeger endpoint URL (e.g. http://jaeger:14268/api/traces) {EXAS_TRACER_URL}
  -url string
        [alcotest] URL to check {EXAS_URL}
  -userAgent string
        [alcotest] User-Agent for check {EXAS_USER_AGENT} (default "Alcotest")
  -writeTimeout duration
        [server] Write Timeout {EXAS_WRITE_TIMEOUT} (default 2m0s)