README.md

README

Online demo

Click on the button to open the online demo.

Documentation

• An online version of api documentation available here
• The documentation can also be generated using buf (see below)

Try Using grpcurl

Example of query:

• Download the grpcurl https://github.com/fullstorydev/grpcurl
• start_date and stop_date are formatted as "YYYY-MM-DDTHH:MM:SSZ"
• Fields for grpcurl should be passed as a json payload like in the example
• name of the fields are the same as the ones in ListSegmentationRequest in the api.html files
• Repeated and optional arguments are not mandatory
• The returns of the ListSegmentation method is a list of SegmentationResponse
• When using grpcurl the response message is a concatenated JSON where each element is the JSON representation of a SegmentationResponse
• Note the wkt field is the geometry of area where you want to search for the segmentation

grpcurl url -d '{"n_results": 5, "start_date": "2021-01-01T00:00:00Z", "end_date": "2022-01-01T00:00:00Z", "wkt": "MULTIPOLYGON (((1.6415459999999999 48.6570210000000003, 2.5066069999999998 48.6616240000000033, 2.5143049999999998 48.6782680000000028, 2.5817120000000000 48.8229529999999983, 2.6498390000000001 48.9676520000000011, 2.7181340000000001 49.1124610000000033, 2.7869250000000001 49.2572189999999992, 2.8559869999999998 49.4018480000000011, 2.9250820000000002 49.5464559999999992, 2.9757820000000001 49.6517830000000018, 1.6142719999999999 49.6444299999999998, 1.6415459999999999 48.6570210000000003)))" }' earthsignature.snapearth.eu:443 snapearth.api.v1.database.DatabaseProductService.ListSegmentation > res.pbtxt

Alternative Implementing a client

Prerequisite

• Read the documentation that describes the messages exchanged between earthsignature and its clients
• Having the protobuf compiler for your programming language of choice (documentation of protobuf: https://developers.google.com/protocol-buffers )
• Having the grpc plugin for your programming language of choice (documentation of gRPC: https://grpc.io/)
• The officially supported languages for gRPC are C#, C++, Dart, Go, Java, Kotlin, Python, NodeJS, Objective-C, PHP, Python, Ruby. (https://grpc.io/docs/languages/)
• Optional: For generating document install the following plugin https://github.com/pseudomuto/protoc-gen-doc

Generate messages and stubs

• Create a directory which will be the root of your client implementation
• Download and install https://github.com/bufbuild/buf . Buf is a tool that facilitates the usage of protocol buffer based services creation.
• Create a buf.gen.yaml at the root of the directory (see documentation at https://docs.buf.build/configuration/v1/buf-gen-yaml/)
• Here is an example of a buf.gen.yaml file:

version: v1
# https://docs.buf.build/configuration/v1/buf-gen-yaml/#managed
managed:
  enabled: true
plugins:
    # The name of the plugin.
    # Required.
    # By default, buf generate will look for a binary named protoc-gen-NAME on your $PATH.
  - name: go
    # The the relative output directory.
    # Required.
    out: gen/go
    # Any options to provide to the plugin.
    # Optional.
    # This can be either a single string or a list of strings.
    opt: paths=source_relative
    # The custom path to the plugin binary, if not protoc-gen-NAME on your $PATH.
    path: custom-gen-go  # optional
    # The generation strategy to use. There are two options:
    #
    # 1. "directory"
    #
    #   This will result in buf splitting the input files by directory, and making separate plugin
    #   invocations in parallel. This is roughly the concurrent equivalent of:
    #
    #     for dir in $(find . -name '*.proto' -print0 | xargs -0 -n1 dirname | sort | uniq); do
    #       protoc -I . $(find "${dir}" -name '*.proto')
    #     done
    #
    #   Almost every Protobuf plugin either requires this, or works with this,
    #   and this is the recommended and default value.
    #
    # 2. "all"
    #
    #   This will result in buf making a single plugin invocation with all input files.
    #   This is roughly the equivalent of:
    #
    #     protoc -I . $(find . -name '*.proto')
    #
    #   This is needed for certain plugins that expect all files to be given at once.
    #
    # Optional. If omitted, "directory" is used. Most users should not need to set this option.
    strategy: directory
  - name: java
    out: gen/java

• For example for a golang client:

version: v1
managed:
  enabled: true
  optimize_for: SPEED

plugins:
  - name: go
    out: gen/go/
  - name: go-grpc
    out: gen/go/
  # OPTIONAL
  #- name: doc
  #  out: docs/source/
  #  opt: html,api.html

• Use buf generate buf.build/qwant/snapearth --include-imports to generate the messages and stubs for your client.

Implement the client in the language of your choice

• The client must use the generated file in order to communicate with the EarthSignature service.
• The EarthSignature endpoint is locate at the adress [earthsignature.snapearth.eu:443]
• The connection is secured using the TLS protocol
• The products can be queried using the service snapearth.api.v1.DatabaseProductService and the method ListSegmenation